CPUs can make a little heat, as a treat
initial version
+479
+1
.gitignore
+1
.gitignore
···
1
+
/target
+331
Cargo.lock
+331
Cargo.lock
···
1
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315
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320
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321
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[[package]]
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327
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[[package]]
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+9
Cargo.toml
+9
Cargo.toml
+48
README.md
+48
README.md
···
1
+
# Heater
2
+
3
+
A Rust command-line application that churns your CPU cores at maximum capacity so your laptop isn't cold
4
+
5
+
## Build
6
+
7
+
```bash
8
+
cargo build --release
9
+
```
10
+
11
+
The compiled binary will be at `target/release/heater`.
12
+
13
+
## Usage
14
+
15
+
### Run indefinitely (until Ctrl+C)
16
+
```bash
17
+
cargo run --release
18
+
# or
19
+
./target/release/heater
20
+
```
21
+
22
+
### Run for a specific duration (in seconds)
23
+
```bash
24
+
cargo run --release -- --duration 30
25
+
# or
26
+
./target/release/heater --duration 30
27
+
```
28
+
29
+
### Customize the number of free cores
30
+
```bash
31
+
# Leave 2 cores free
32
+
cargo run --release -- --free-cores 2
33
+
34
+
# Use ALL cores (leave 0 free)
35
+
cargo run --release -- --free-cores 0
36
+
37
+
# Run for 60 seconds, leaving 2 cores free
38
+
cargo run --release -- --duration 60 --free-cores 2
39
+
```
40
+
41
+
## Options
42
+
43
+
```
44
+
-d, --duration <DURATION> Duration to run in seconds (omit for indefinite run)
45
+
-f, --free-cores <FREE_CORES> Number of cores to leave free (default: 1)
46
+
-h, --help Print help
47
+
-V, --version Print version
48
+
```
+90
src/main.rs
+90
src/main.rs
···
1
+
use clap::Parser;
2
+
use std::sync::atomic::{AtomicBool, Ordering};
3
+
use std::sync::Arc;
4
+
use std::thread;
5
+
use std::time::{Duration, Instant};
6
+
7
+
#[derive(Parser, Debug)]
8
+
#[command(author, version, about = "A CPU heater that churns CPU cores", long_about = None)]
9
+
struct Args {
10
+
/// Duration to run in seconds (omit for indefinite run)
11
+
#[arg(short, long)]
12
+
duration: Option<u64>,
13
+
14
+
/// Number of cores to leave free (default: 1)
15
+
#[arg(short = 'f', long, default_value_t = 1)]
16
+
free_cores: usize,
17
+
}
18
+
19
+
fn main() {
20
+
let args = Args::parse();
21
+
22
+
// Get the number of logical CPU cores
23
+
let total_cores = num_cpus::get();
24
+
let cores_to_use = total_cores.saturating_sub(args.free_cores).max(1);
25
+
26
+
println!("Total CPU cores: {}", total_cores);
27
+
println!("Cores to heat: {}", cores_to_use);
28
+
println!("Cores to leave free: {}", args.free_cores);
29
+
30
+
match args.duration {
31
+
Some(seconds) => println!("Running for {} seconds", seconds),
32
+
None => println!("Running indefinitely (press Ctrl+C to stop)"),
33
+
}
34
+
35
+
// Set up signal handler for graceful shutdown
36
+
let running = Arc::new(AtomicBool::new(true));
37
+
let r = running.clone();
38
+
39
+
ctrlc::set_handler(move || {
40
+
println!("\nReceived Ctrl+C, shutting down...");
41
+
r.store(false, Ordering::SeqCst);
42
+
})
43
+
.expect("Error setting Ctrl-C handler");
44
+
45
+
let start_time = Instant::now();
46
+
let duration = args.duration.map(Duration::from_secs);
47
+
48
+
// Spawn threads to churn CPU
49
+
let mut handles = vec![];
50
+
for i in 0..cores_to_use {
51
+
let running = running.clone();
52
+
let handle = thread::spawn(move || {
53
+
println!("Thread {} started", i);
54
+
let mut counter: u64 = 0;
55
+
while running.load(Ordering::SeqCst) {
56
+
//compute something meaningless but CPU-intensive
57
+
counter = counter.wrapping_add(1);
58
+
for j in 0..1000 {
59
+
counter = counter
60
+
.wrapping_mul(1103515245)
61
+
.wrapping_add(j)
62
+
.wrapping_rem(2147483648);
63
+
}
64
+
}
65
+
println!("Thread {} stopped after {} iterations", i, counter);
66
+
});
67
+
handles.push(handle);
68
+
}
69
+
70
+
// Monitor duration if specified
71
+
if let Some(dur) = duration {
72
+
while start_time.elapsed() < dur && running.load(Ordering::SeqCst) {
73
+
thread::sleep(Duration::from_millis(100));
74
+
}
75
+
running.store(false, Ordering::SeqCst);
76
+
} else {
77
+
// Wait indefinitely until Ctrl+C
78
+
for handle in handles {
79
+
handle.join().unwrap();
80
+
}
81
+
return;
82
+
}
83
+
84
+
// Wait for all threads to finish
85
+
for handle in handles {
86
+
handle.join().unwrap();
87
+
}
88
+
89
+
println!("Finished heating for {:?}", start_time.elapsed());
90
+
}