I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Here's a self-contained Rust program that meets your requirements:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::thread; use std::sync::{Arc, Mutex}; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<String> = reader.lines().map(|l| l.expect("Failed to read line")).collect(); let chunk_size = (lines.len() + 3) / 4; let chunks: Vec<Vec<String>> = lines.chunks(chunk_size).map(|c| c.to_vec()).collect(); let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in chunks { let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for result in results.lock().unwrap().iter() { println!("{}", serde_json::to_string(result).unwrap()); } } // A simple JSON serializer implementation mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut output = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { output.push_str(", "); } output.push_str(&format!("\"{}\": {}", key, value)); } output.push('}'); Ok(output) } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::thread; use std::sync::{Arc, Mutex}; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<String> = reader.lines().map(|l| l.expect("Failed to read line")).collect(); let chunk_size = (lines.len() + 3) / 4; let chunks: Vec<Vec<String>> = lines.chunks(chunk_size).map(|c| c.to_vec()).collect(); let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in chunks { let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for result in results.lock().unwrap().iter() { println!("{}", serde_json::to_string(result).unwrap()); } } // A simple JSON serializer implementation mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut output = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { output.push_str(", "); } output.push_str(&format!("\"{}\": {}", key, value)); } output.push('}'); Ok(output) } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::thread; use std::sync::{Arc, Mutex}; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<String> = reader.lines().map(|l| l.expect("Failed to read line")).collect(); let chunk_size = (lines.len() + 3) / 4; let chunks: Vec<Vec<String>> = lines.chunks(chunk_size).map(|c| c.to_vec()).collect(); let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in chunks { let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for result in results.lock().unwrap().iter() { println!("{}", serde_json::to_string(result).unwrap()); } } // A simple JSON serializer implementation mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut output = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { output.push_str(", "); } output.push_str(&format!("\"{}\": {}", key, value)); } output.push('}'); Ok(output) } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | use std::fs::File; use std::io::{BufRead, BufReader}; use std::collections::HashMap; use std::thread; use std::sync::{Arc, Mutex}; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let reader = BufReader::new(file); let lines: Vec<String> = reader.lines().map(|l| l.expect("Failed to read line")).collect(); let chunk_size = (lines.len() + 3) / 4; let chunks: Vec<Vec<String>> = lines.chunks(chunk_size).map(|c| c.to_vec()).collect(); let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for chunk in chunks { let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut word_count = HashMap::new(); for line in chunk { for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } for result in results.lock().unwrap().iter() { println!("{}", serde_json::to_string(result).unwrap()); } } // A simple JSON serializer implementation mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut output = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { output.push_str(", "); } output.push_str(&format!("\"{}\": {}", key, value)); } output.push('}'); Ok(output) } } |
{"other": 1, "was": 10, "everything": 1, "spring": 1, "we": 4, "hope,": 1, "it": 10, "wisdom,": 1, "nothing": 1, "age": 2, "had": 2, "Light,": 1, "going": 2, "before": 2, "of": 10, "all": 2, "foolishness,": 1, "us,": 2, "way": 1, "winter": 1, "the": 11, "Darkness,": 1, "despair,": 1, "incredulity,": 1, "were": 2, "belief,": 1, "worst": 1, "Heaven,": 1, "times,": 2, "season": 2, "epoch": 2, "best": 1, "to": 1, "direct": 2}
Resulting in output: [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: True
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Here's a self-contained Rust program that meets your requirements:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for i in 0..4 { let start = i as u64 * chunk_size; let end = if i == 3 { file_size } else { (i + 1) as u64 * chunk_size }; let file = file.try_clone().expect("Failed to clone file"); let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut reader = BufReader::new(file); reader.seek(SeekFrom::Start(start)).expect("Failed to seek"); let mut word_count = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).expect("Failed to read line") > 0 { if reader.stream_position().expect("Failed to get position") > end && !line.is_empty() { break; } for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); for word_count in results.iter() { println!("{}", serde_json::to_string(&word_count).unwrap()); } } // Simple JSON serialization function mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut result = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { result.push_str(", "); } result.push_str(&format!("\"{}\": {}", key, value)); } result.push('}'); Ok(result) } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for i in 0..4 { let start = i as u64 * chunk_size; let end = if i == 3 { file_size } else { (i + 1) as u64 * chunk_size }; let file = file.try_clone().expect("Failed to clone file"); let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut reader = BufReader::new(file); reader.seek(SeekFrom::Start(start)).expect("Failed to seek"); let mut word_count = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).expect("Failed to read line") > 0 { if reader.stream_position().expect("Failed to get position") > end && !line.is_empty() { break; } for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); for word_count in results.iter() { println!("{}", serde_json::to_string(&word_count).unwrap()); } } // Simple JSON serialization function mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut result = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { result.push_str(", "); } result.push_str(&format!("\"{}\": {}", key, value)); } result.push('}'); Ok(result) } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for i in 0..4 { let start = i as u64 * chunk_size; let end = if i == 3 { file_size } else { (i + 1) as u64 * chunk_size }; let file = file.try_clone().expect("Failed to clone file"); let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut reader = BufReader::new(file); reader.seek(SeekFrom::Start(start)).expect("Failed to seek"); let mut word_count = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).expect("Failed to read line") > 0 { if reader.stream_position().expect("Failed to get position") > end && !line.is_empty() { break; } for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); for word_count in results.iter() { println!("{}", serde_json::to_string(&word_count).unwrap()); } } // Simple JSON serialization function mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut result = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { result.push_str(", "); } result.push_str(&format!("\"{}\": {}", key, value)); } result.push('}'); Ok(result) } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let results: Arc<Mutex<Vec<HashMap<String, usize>>>> = Arc::new(Mutex::new(Vec::new())); let mut handles = vec![]; for i in 0..4 { let start = i as u64 * chunk_size; let end = if i == 3 { file_size } else { (i + 1) as u64 * chunk_size }; let file = file.try_clone().expect("Failed to clone file"); let results = Arc::clone(&results); let handle = thread::spawn(move || { let mut reader = BufReader::new(file); reader.seek(SeekFrom::Start(start)).expect("Failed to seek"); let mut word_count = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).expect("Failed to read line") > 0 { if reader.stream_position().expect("Failed to get position") > end && !line.is_empty() { break; } for word in line.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } results.lock().unwrap().push(word_count); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } let results = results.lock().unwrap(); for word_count in results.iter() { println!("{}", serde_json::to_string(&word_count).unwrap()); } } // Simple JSON serialization function mod serde_json { use std::collections::HashMap; pub fn to_string(map: &HashMap<String, usize>) -> Result<String, std::fmt::Error> { let mut result = String::from("{"); for (i, (key, value)) in map.iter().enumerate() { if i > 0 { result.push_str(", "); } result.push_str(&format!("\"{}\": {}", key, value)); } result.push('}'); Ok(result) } } |
{}
{}
{}
{"before": 1, "nothing": 1, "were": 2, "going": 2, "direct": 2, "had": 1, "us,": 2, "Heaven,": 1, "the": 1, "to": 1, "other": 1, "way": 1, "all": 2, "we": 3}
Resulting in output: [('Heaven,', 1), ('all', 2), ('before', 1), ('direct', 2), ('going', 2), ('had', 1), ('nothing', 1), ('other', 1), ('the', 1), ('to', 1), ('us,', 2), ('way', 1), ('we', 3), ('were', 2)]
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Here's a self-contained Rust program that meets your requirements:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); let start = i * chunk_size; let end = if i == 3 { file_size } else { (i + 1) * chunk_size }; let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(start)).unwrap(); let reader = BufReader::new(file); let mut bytes_read = 0; for line in reader.lines() { let line = line.unwrap(); for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } bytes_read += line.len() as u64 + 1; // +1 for newline if bytes_read >= end - start { break; } } // Convert HashMap to JSON-like string let json_output = word_counts.iter() .map(|(k, v)| format!("\"{}\": {}", k, v)) .collect::<Vec<String>>() .join(", "); format!("{{{}}}", json_output) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); let start = i * chunk_size; let end = if i == 3 { file_size } else { (i + 1) * chunk_size }; let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(start)).unwrap(); let reader = BufReader::new(file); let mut bytes_read = 0; for line in reader.lines() { let line = line.unwrap(); for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } bytes_read += line.len() as u64 + 1; // +1 for newline if bytes_read >= end - start { break; } } // Convert HashMap to JSON-like string let json_output = word_counts.iter() .map(|(k, v)| format!("\"{}\": {}", k, v)) .collect::<Vec<String>>() .join(", "); format!("{{{}}}", json_output) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); let start = i * chunk_size; let end = if i == 3 { file_size } else { (i + 1) * chunk_size }; let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(start)).unwrap(); let reader = BufReader::new(file); let mut bytes_read = 0; for line in reader.lines() { let line = line.unwrap(); for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } bytes_read += line.len() as u64 + 1; // +1 for newline if bytes_read >= end - start { break; } } // Convert HashMap to JSON-like string let json_output = word_counts.iter() .map(|(k, v)| format!("\"{}\": {}", k, v)) .collect::<Vec<String>>() .join(", "); format!("{{{}}}", json_output) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); let start = i * chunk_size; let end = if i == 3 { file_size } else { (i + 1) * chunk_size }; let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(start)).unwrap(); let reader = BufReader::new(file); let mut bytes_read = 0; for line in reader.lines() { let line = line.unwrap(); for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } bytes_read += line.len() as u64 + 1; // +1 for newline if bytes_read >= end - start { break; } } // Convert HashMap to JSON-like string let json_output = word_counts.iter() .map(|(k, v)| format!("\"{}\": {}", k, v)) .collect::<Vec<String>>() .join(", "); format!("{{{}}}", json_output) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } |
error[E0277]: the trait bound `MutexGuard<'_, File>: std::io::Read` is not satisfied
--> main.rs:25:41
|
25 | let reader = BufReader::new(file);
| -------------- ^^^^ the trait `std::io::Read` is not implemented for `MutexGuard<'_, File>`
| |
| required by a bound introduced by this call
|
note: required by a bound in `BufReader::<R>::new`
--> /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/io/buffered/bufreader.rs:72:5
error[E0599]: the method `lines` exists for struct `BufReader<MutexGuard<'_, File>>`, but its trait bounds were not satisfied
--> main.rs:28:32
|
28 | for line in reader.lines() {
| ^^^^^ method cannot be called on `BufReader<MutexGuard<'_, File>>` due to unsatisfied trait bounds
|
= note: the following trait bounds were not satisfied:
`MutexGuard<'_, File>: std::io::Read`
which is required by `BufReader<MutexGuard<'_, File>>: BufRead`
`BufReader<MutexGuard<'_, File>>: BufRead`
which is required by `&mut BufReader<MutexGuard<'_, File>>: BufRead`
warning: unused import: `BufRead`
--> main.rs:4:15
|
4 | use std::io::{BufRead, BufReader, Seek, SeekFrom};
| ^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
error: aborting due to 2 previous errors; 1 warning emitted
Some errors have detailed explanations: E0277, E0599.
For more information about an error, try `rustc --explain E0277`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Here's a self-contained Rust program that meets your requirements:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).unwrap() > 0 { for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } word_counts }); handles.push(handle); } for handle in handles { let word_counts = handle.join().unwrap(); print_json(&word_counts); } } fn print_json(word_counts: &HashMap<String, usize>) { print!("{{"); for (i, (word, count)) in word_counts.iter().enumerate() { if i > 0 { print!(", "); } print!("\"{}\": {}", word, count); } println!("}}"); } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).unwrap() > 0 { for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } word_counts }); handles.push(handle); } for handle in handles { let word_counts = handle.join().unwrap(); print_json(&word_counts); } } fn print_json(word_counts: &HashMap<String, usize>) { print!("{{"); for (i, (word, count)) in word_counts.iter().enumerate() { if i > 0 { print!(", "); } print!("\"{}\": {}", word, count); } println!("}}"); } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).unwrap() > 0 { for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } word_counts }); handles.push(handle); } for handle in handles { let word_counts = handle.join().unwrap(); print_json(&word_counts); } } fn print_json(word_counts: &HashMap<String, usize>) { print!("{{"); for (i, (word, count)) in word_counts.iter().enumerate() { if i > 0 { print!(", "); } print!("\"{}\": {}", word, count); } println!("}}"); } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let shared_file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let shared_file = Arc::clone(&shared_file); let handle = thread::spawn(move || { let mut file = shared_file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut line = String::new(); while reader.read_line(&mut line).unwrap() > 0 { for word in line.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } line.clear(); } word_counts }); handles.push(handle); } for handle in handles { let word_counts = handle.join().unwrap(); print_json(&word_counts); } } fn print_json(word_counts: &HashMap<String, usize>) { print!("{{"); for (i, (word, count)) in word_counts.iter().enumerate() { if i > 0 { print!(", "); } print!("\"{}\": {}", word, count); } println!("}}"); } |
error[E0507]: cannot move out of dereference of `MutexGuard<'_, File>`
--> main.rs:22:45
|
22 | let mut reader = BufReader::new(file.take(chunk_size));
| ^^^^ ---------------- value moved due to this method call
| |
| move occurs because value has type `File`, which does not implement the `Copy` trait
|
note: `std::io::Read::take` takes ownership of the receiver `self`, which moves value
--> /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/io/mod.rs:1156:13
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0507`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False
I have setup the docker container to run the model evaluation.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Write a self-contained Rust program that prints a JSON output of how often each word appears in a text file located in /tmp/file.txt. So if the file contains "This is is is, an example" then the program should print to stdout. {"This": 1, "is": 2, "is,": 1, "an": 1, "example": 1} Don't import any crates that would require a Cargo.toml file. I'll just compile it with `rustc yourfile.rs` and it should work. The program should be run by calling /path/to/rust_word_count with no arguments. Make it run in parallel on 4 cores at the same time, each job taking ~1/4 of the file. Print out 4 differnt json dicts, one per line. I'll do the merging.
Here's a self-contained Rust program that meets your requirements. It reads a file from `/tmp/file.txt`, processes it in parallel using 4 threads, and prints JSON output for word counts from each thread:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let file = Arc::clone(&file); let handle = thread::spawn(move || { let mut file = file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut buffer = String::new(); while reader.read_line(&mut buffer).unwrap() > 0 { for word in buffer.split_whitespace() { let word = word.trim_matches(|c: char| !c.is_alphanumeric()); *word_counts.entry(word.to_string()).or_insert(0) += 1; } buffer.clear(); } format!("{:?}", word_counts) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let file = Arc::clone(&file); let handle = thread::spawn(move || { let mut file = file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut buffer = String::new(); while reader.read_line(&mut buffer).unwrap() > 0 { for word in buffer.split_whitespace() { let word = word.trim_matches(|c: char| !c.is_alphanumeric()); *word_counts.entry(word.to_string()).or_insert(0) += 1; } buffer.clear(); } format!("{:?}", word_counts) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } |
Below is some student's code. I asked them to parallelize some code. Do not judge if it is correct, I have test cases for that. Logic errors are okay. So are synatx errors. Just tell me if they tried to parallelize it. use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let file = Arc::clone(&file); let handle = thread::spawn(move || { let mut file = file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut buffer = String::new(); while reader.read_line(&mut buffer).unwrap() > 0 { for word in buffer.split_whitespace() { let word = word.trim_matches(|c: char| !c.is_alphanumeric()); *word_counts.entry(word.to_string()).or_insert(0) += 1; } buffer.clear(); } format!("{:?}", word_counts) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } Answer either 'The student passes' or 'The student fails'.
The student passes.
Testing if the previous output contains the string student passes
: True
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | use std::collections::HashMap; use std::fs::File; use std::io::{BufRead, BufReader, Read, Seek, SeekFrom}; use std::sync::{Arc, Mutex}; use std::thread; fn main() { let file = File::open("/tmp/file.txt").expect("Failed to open file"); let file_size = file.metadata().expect("Failed to get file metadata").len(); let chunk_size = file_size / 4; let file = Arc::new(Mutex::new(file)); let mut handles = vec![]; for i in 0..4 { let file = Arc::clone(&file); let handle = thread::spawn(move || { let mut file = file.lock().unwrap(); file.seek(SeekFrom::Start(i * chunk_size)).unwrap(); let mut reader = BufReader::new(file.take(chunk_size)); let mut word_counts = HashMap::new(); let mut buffer = String::new(); while reader.read_line(&mut buffer).unwrap() > 0 { for word in buffer.split_whitespace() { let word = word.trim_matches(|c: char| !c.is_alphanumeric()); *word_counts.entry(word.to_string()).or_insert(0) += 1; } buffer.clear(); } format!("{:?}", word_counts) }); handles.push(handle); } for handle in handles { println!("{}", handle.join().unwrap()); } } |
error[E0507]: cannot move out of dereference of `MutexGuard<'_, File>`
--> main.rs:22:45
|
22 | let mut reader = BufReader::new(file.take(chunk_size));
| ^^^^ ---------------- value moved due to this method call
| |
| move occurs because value has type `File`, which does not implement the `Copy` trait
|
note: `std::io::Read::take` takes ownership of the receiver `self`, which moves value
--> /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/io/mod.rs:1156:13
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0507`.
main.sh: line 2: ./a.out: No such file or directory
Resulting in output: []
Testing if the previous output equals the string [('Darkness,', 1), ('Heaven,', 1), ('Light,', 1), ('age', 2), ('all', 2), ('before', 2), ('belief,', 1), ('best', 1), ('despair,', 1), ('direct', 2), ('epoch', 2), ('everything', 1), ('foolishness,', 1), ('going', 2), ('had', 2), ('hope,', 1), ('incredulity,', 1), ('it', 10), ('nothing', 1), ('of', 10), ('other', 1), ('season', 2), ('spring', 1), ('the', 11), ('times,', 2), ('to', 1), ('us,', 2), ('was', 10), ('way', 1), ('we', 4), ('were', 2), ('winter', 1), ('wisdom,', 1), ('worst', 1)]
: False