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.
# Rust Word Count Program with Parallel Processing Here's a self-contained Rust program that counts word frequencies in parallel across 4 cores:
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 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | use std::collections::HashMap; use std::fs::File; use std::io::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file content let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Calculate chunk sizes for parallel processing let content_len = content.len(); let chunk_size = content_len / 4; // Split content into 4 chunks, ensuring we split on word boundaries let mut chunks = Vec::new(); let mut start_idx = 0; for _ in 0..3 { if start_idx >= content_len { break; } let mut end_idx = std::cmp::min(start_idx + chunk_size, content_len); // Find the next whitespace to avoid cutting words while end_idx < content_len && !content.as_bytes()[end_idx].is_ascii_whitespace() { end_idx += 1; } chunks.push(content[start_idx..end_idx].to_string()); start_idx = end_idx; } // Add the remaining content as the last chunk if start_idx < content_len { chunks.push(content[start_idx..].to_string()); } // Ensure we have exactly 4 chunks (even for short files) while chunks.len() < 4 { chunks.push(String::new()); } // Process each chunk in a separate thread let mut handles = vec![]; for chunk in chunks { let handle = thread::spawn(move || { let mut word_count = HashMap::new(); // Count word occurrences in this chunk for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } // Convert the HashMap to a JSON string let mut json = "{".to_string(); let mut first = true; for (word, count) in word_count { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Collect and print results from each thread for handle in handles { match handle.join() { Ok(json) => println!("{}", json), Err(_) => println!("{}"), // Print empty JSON object for failed threads } } Ok(()) } |
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 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | use std::collections::HashMap; use std::fs::File; use std::io::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file content let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Calculate chunk sizes for parallel processing let content_len = content.len(); let chunk_size = content_len / 4; // Split content into 4 chunks, ensuring we split on word boundaries let mut chunks = Vec::new(); let mut start_idx = 0; for _ in 0..3 { if start_idx >= content_len { break; } let mut end_idx = std::cmp::min(start_idx + chunk_size, content_len); // Find the next whitespace to avoid cutting words while end_idx < content_len && !content.as_bytes()[end_idx].is_ascii_whitespace() { end_idx += 1; } chunks.push(content[start_idx..end_idx].to_string()); start_idx = end_idx; } // Add the remaining content as the last chunk if start_idx < content_len { chunks.push(content[start_idx..].to_string()); } // Ensure we have exactly 4 chunks (even for short files) while chunks.len() < 4 { chunks.push(String::new()); } // Process each chunk in a separate thread let mut handles = vec![]; for chunk in chunks { let handle = thread::spawn(move || { let mut word_count = HashMap::new(); // Count word occurrences in this chunk for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } // Convert the HashMap to a JSON string let mut json = "{".to_string(); let mut first = true; for (word, count) in word_count { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Collect and print results from each thread for handle in handles { match handle.join() { Ok(json) => println!("{}", json), Err(_) => println!("{}"), // Print empty JSON object for failed threads } } Ok(()) } |
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::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file content let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Calculate chunk sizes for parallel processing let content_len = content.len(); let chunk_size = content_len / 4; // Split content into 4 chunks, ensuring we split on word boundaries let mut chunks = Vec::new(); let mut start_idx = 0; for _ in 0..3 { if start_idx >= content_len { break; } let mut end_idx = std::cmp::min(start_idx + chunk_size, content_len); // Find the next whitespace to avoid cutting words while end_idx < content_len && !content.as_bytes()[end_idx].is_ascii_whitespace() { end_idx += 1; } chunks.push(content[start_idx..end_idx].to_string()); start_idx = end_idx; } // Add the remaining content as the last chunk if start_idx < content_len { chunks.push(content[start_idx..].to_string()); } // Ensure we have exactly 4 chunks (even for short files) while chunks.len() < 4 { chunks.push(String::new()); } // Process each chunk in a separate thread let mut handles = vec![]; for chunk in chunks { let handle = thread::spawn(move || { let mut word_count = HashMap::new(); // Count word occurrences in this chunk for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } // Convert the HashMap to a JSON string let mut json = "{".to_string(); let mut first = true; for (word, count) in word_count { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Collect and print results from each thread for handle in handles { match handle.join() { Ok(json) => println!("{}", json), Err(_) => println!("{}"), // Print empty JSON object for failed threads } } Ok(()) } 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 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | use std::collections::HashMap; use std::fs::File; use std::io::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file content let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Calculate chunk sizes for parallel processing let content_len = content.len(); let chunk_size = content_len / 4; // Split content into 4 chunks, ensuring we split on word boundaries let mut chunks = Vec::new(); let mut start_idx = 0; for _ in 0..3 { if start_idx >= content_len { break; } let mut end_idx = std::cmp::min(start_idx + chunk_size, content_len); // Find the next whitespace to avoid cutting words while end_idx < content_len && !content.as_bytes()[end_idx].is_ascii_whitespace() { end_idx += 1; } chunks.push(content[start_idx..end_idx].to_string()); start_idx = end_idx; } // Add the remaining content as the last chunk if start_idx < content_len { chunks.push(content[start_idx..].to_string()); } // Ensure we have exactly 4 chunks (even for short files) while chunks.len() < 4 { chunks.push(String::new()); } // Process each chunk in a separate thread let mut handles = vec![]; for chunk in chunks { let handle = thread::spawn(move || { let mut word_count = HashMap::new(); // Count word occurrences in this chunk for word in chunk.split_whitespace() { *word_count.entry(word.to_string()).or_insert(0) += 1; } // Convert the HashMap to a JSON string let mut json = "{".to_string(); let mut first = true; for (word, count) in word_count { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Collect and print results from each thread for handle in handles { match handle.join() { Ok(json) => println!("{}", json), Err(_) => println!("{}"), // Print empty JSON object for failed threads } } Ok(()) } |
error: 1 positional argument in format string, but no arguments were given
--> main.rs:83:33
|
83 | Err(_) => println!("{}"), // Print empty JSON object for failed threads
| ^^
error: aborting due to 1 previous error
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 counts words in parallel as requested:
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 68 69 70 71 | use std::collections::HashMap; use std::fs::File; use std::io::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Split the file into 4 roughly equal chunks let total_len = content.len(); let chunk_size = total_len / 4; let mut chunk_boundaries = Vec::new(); // Find chunk boundaries at whitespace chunk_boundaries.push(0); for i in 1..4 { let target_pos = i * chunk_size; let mut pos = target_pos; // Skip forward to find whitespace while pos < total_len && !content.as_bytes()[pos].is_ascii_whitespace() { pos += 1; } chunk_boundaries.push(pos); } chunk_boundaries.push(total_len); // Process each chunk in parallel let mut handles = Vec::new(); for i in 0..4 { let start = chunk_boundaries[i]; let end = chunk_boundaries[i+1]; let chunk = content[start..end].to_string(); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); // Count words in this chunk for word in chunk.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } // Manually create JSON output let mut json = String::from("{"); let mut first = true; for (word, count) in word_counts { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Print results from each thread for handle in handles { println!("{}", handle.join().unwrap()); } Ok(()) } |
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 68 69 70 71 | use std::collections::HashMap; use std::fs::File; use std::io::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Split the file into 4 roughly equal chunks let total_len = content.len(); let chunk_size = total_len / 4; let mut chunk_boundaries = Vec::new(); // Find chunk boundaries at whitespace chunk_boundaries.push(0); for i in 1..4 { let target_pos = i * chunk_size; let mut pos = target_pos; // Skip forward to find whitespace while pos < total_len && !content.as_bytes()[pos].is_ascii_whitespace() { pos += 1; } chunk_boundaries.push(pos); } chunk_boundaries.push(total_len); // Process each chunk in parallel let mut handles = Vec::new(); for i in 0..4 { let start = chunk_boundaries[i]; let end = chunk_boundaries[i+1]; let chunk = content[start..end].to_string(); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); // Count words in this chunk for word in chunk.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } // Manually create JSON output let mut json = String::from("{"); let mut first = true; for (word, count) in word_counts { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Print results from each thread for handle in handles { println!("{}", handle.join().unwrap()); } Ok(()) } |
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::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Split the file into 4 roughly equal chunks let total_len = content.len(); let chunk_size = total_len / 4; let mut chunk_boundaries = Vec::new(); // Find chunk boundaries at whitespace chunk_boundaries.push(0); for i in 1..4 { let target_pos = i * chunk_size; let mut pos = target_pos; // Skip forward to find whitespace while pos < total_len && !content.as_bytes()[pos].is_ascii_whitespace() { pos += 1; } chunk_boundaries.push(pos); } chunk_boundaries.push(total_len); // Process each chunk in parallel let mut handles = Vec::new(); for i in 0..4 { let start = chunk_boundaries[i]; let end = chunk_boundaries[i+1]; let chunk = content[start..end].to_string(); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); // Count words in this chunk for word in chunk.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } // Manually create JSON output let mut json = String::from("{"); let mut first = true; for (word, count) in word_counts { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Print results from each thread for handle in handles { println!("{}", handle.join().unwrap()); } Ok(()) } 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 68 69 70 71 | use std::collections::HashMap; use std::fs::File; use std::io::{self, Read}; use std::thread; fn main() -> io::Result<()> { // Read the file let mut file = File::open("/tmp/file.txt")?; let mut content = String::new(); file.read_to_string(&mut content)?; // Split the file into 4 roughly equal chunks let total_len = content.len(); let chunk_size = total_len / 4; let mut chunk_boundaries = Vec::new(); // Find chunk boundaries at whitespace chunk_boundaries.push(0); for i in 1..4 { let target_pos = i * chunk_size; let mut pos = target_pos; // Skip forward to find whitespace while pos < total_len && !content.as_bytes()[pos].is_ascii_whitespace() { pos += 1; } chunk_boundaries.push(pos); } chunk_boundaries.push(total_len); // Process each chunk in parallel let mut handles = Vec::new(); for i in 0..4 { let start = chunk_boundaries[i]; let end = chunk_boundaries[i+1]; let chunk = content[start..end].to_string(); let handle = thread::spawn(move || { let mut word_counts = HashMap::new(); // Count words in this chunk for word in chunk.split_whitespace() { *word_counts.entry(word.to_string()).or_insert(0) += 1; } // Manually create JSON output let mut json = String::from("{"); let mut first = true; for (word, count) in word_counts { if !first { json.push_str(", "); } first = false; json.push_str(&format!("\"{}\": {}", word, count)); } json.push_str("}"); json }); handles.push(handle); } // Print results from each thread for handle in handles { println!("{}", handle.join().unwrap()); } Ok(()) } |
{"was": 4, "of": 4, "worst": 1, "wisdom,": 1, "best": 1, "age": 2, "the": 4, "times,": 2, "it": 4, "foolishness,": 1}
{"was": 4, "incredulity,": 1, "Light,": 1, "belief,": 1, "the": 4, "it": 4, "epoch": 2, "of": 3, "season": 1}
{"had": 1, "season": 1, "Darkness,": 1, "everything": 1, "hope,": 1, "before": 1, "spring": 1, "us,": 1, "despair,": 1, "winter": 1, "was": 2, "of": 3, "we": 1, "it": 2, "the": 2}
{"the": 1, "way": 1, "before": 1, "were": 2, "nothing": 1, "Heaven,": 1, "all": 2, "other": 1, "we": 3, "had": 1, "going": 2, "direct": 2, "to": 1, "us,": 1}
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