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+]

Cargo.toml

···
 edition = "2024"
 
 [dependencies]
+bytemuck = "1.24.0"
 clap = { version = "4.5.48", features = ["derive"] }
 ctrlc = "3.5.0"
 num_cpus = "1.17.0"
+pollster = "0.4.0"
+wgpu = { version = "27.0.1", features = ["fragile-send-sync-non-atomic-wasm"] }

README.md

···
-# Heater 
+# Heater 🔥
 
-A Rust command-line application that churns your CPU cores at maximum capacity so your laptop isn't cold
+A Rust command-line application that churns your CPU and GPU at maximum capacity for testing, benchmarking, or keeping your system warm.
+
+## Features
+
+- 🔥 Maximizes CPU usage across multiple cores
+- 🎮 Optional GPU heating using compute shaders
+- 🛡️ Leaves one core free by default (configurable)
+- ⏱️ Run for a specific duration or indefinitely
+- 🛑 Graceful shutdown with Ctrl+C
+- 📊 Real-time thread and GPU iteration status
+- 🌐 Cross-platform GPU support (Metal, Vulkan, DX12, OpenGL)
 
 ## Build
 
···
 
 ## Usage
 
-### Run indefinitely (until Ctrl+C)
+### CPU heating only (default)
 ```bash
+# Run indefinitely (until Ctrl+C)
 cargo run --release
-# or
-./target/release/heater
-```
 
-### Run for a specific duration (in seconds)
-```bash
+# Run for 30 seconds
 cargo run --release -- --duration 30
-# or
-./target/release/heater --duration 30
-```
 
-### Customize the number of free cores
-```bash
 # Leave 2 cores free
 cargo run --release -- --free-cores 2
+```
 
-# Use ALL cores (leave 0 free)
-cargo run --release -- --free-cores 0
+### GPU heating
+```bash
+# Enable GPU heating with the --gpu flag
+cargo run --release -- --gpu
 
-# Run for 60 seconds, leaving 2 cores free
-cargo run --release -- --duration 60 --free-cores 2
+# GPU + CPU for 60 seconds
+cargo run --release -- --gpu --duration 60
+
+# Max heat: all cores + GPU
+cargo run --release -- --gpu --free-cores 0
+```
+
+### Advanced examples
+```bash
+# Use ALL cores (leave 0 free) + GPU for 2 minutes
+./target/release/heater --gpu --free-cores 0 --duration 120
+
+# CPU only, leaving 3 cores free, run indefinitely
+./target/release/heater --free-cores 3
 ```
 
 ## Options
···
 ```
 -d, --duration <DURATION>      Duration to run in seconds (omit for indefinite run)
 -f, --free-cores <FREE_CORES>  Number of cores to leave free (default: 1)
+-g, --gpu                      Enable GPU heating (requires compatible GPU)
 -h, --help                     Print help
 -V, --version                  Print version
 ```
+
+## How It Works
+
+### CPU Heating
+The application:
+1. Detects the number of logical CPU cores on your system
+2. Spawns threads equal to (total cores - free cores)
+3. Each thread performs intensive mathematical operations in a tight loop
+4. Continues until the specified duration expires or you press Ctrl+C
+
+### GPU Heating
+When `--gpu` is enabled:
+1. Initializes GPU using wgpu (supports Metal, Vulkan, DX12, OpenGL)
+2. Creates compute shaders that perform intensive trigonometric and exponential operations
+3. Dispatches large workgroups (256x256) continuously to maximize GPU utilization
+4. Runs in parallel with CPU heating threads
+
+## Use Cases
+
+- CPU/GPU stress testing
+- Thermal testing and validation
+- Benchmarking cooling solutions
+- Testing throttling behavior
+- Power consumption testing
+- Keeping your laptop warm in winter ❄️
+
+## GPU Compatibility
+
+The GPU heater uses `wgpu` which supports:
+- **macOS**: Metal
+- **Windows**: DirectX 12, Vulkan
+- **Linux**: Vulkan, OpenGL
+- **Web**: WebGPU
+
+If GPU initialization fails, the app will fall back to CPU-only heating.
+
+## Safety Notes
+
+⚠️ **Warning**: This application will significantly increase CPU and GPU temperature and power consumption. 
+
+- Ensure your system has adequate cooling before running for extended periods
+- Monitor temperatures if running for long durations
+- Some laptops may throttle or shut down if temperatures get too high
+- Use `--free-cores` to leave headroom for system processes

src/heater.wgsl

···
+// GPU compute shader for heating
+// Performs intensive matrix-like operations on data
+
+@group(0) @binding(0)
+var<storage, read> input: array<f32>;
+
+@group(0) @binding(1)
+var<storage, read_write> output: array<f32>;
+
+@compute @workgroup_size(256)
+fn main(@builtin(global_invocation_id) global_id: vec3<u32>) {
+    let index = global_id.x;
+    
+    // Perform intensive math operations
+    var value = f32(index);
+    
+    // Matrix-like computations (unrolled for more heat)
+    for (var i = 0u; i < 100u; i++) {
+        value = sin(value) * cos(value * 1.234);
+        value = value * value + sqrt(abs(value));
+        value = pow(abs(value), 1.5) * 0.001;
+        value = exp(value * 0.01) - log(abs(value) + 1.0);
+        value = tan(value * 0.1) + atan(value);
+    }
+    
+    // Write result (if index is in bounds)
+    if (index < arrayLength(&output)) {
+        output[index] = value;
+    }
+}

src/main.rs

···
 use std::time::{Duration, Instant};
 
 #[derive(Parser, Debug)]
-#[command(author, version, about = "A CPU heater that churns CPU cores", long_about = None)]
+#[command(author, version, about = "A CPU/GPU heater that churns hardware", long_about = None)]
 struct Args {
     /// Duration to run in seconds (omit for indefinite run)
     #[arg(short, long)]
···
     /// Number of cores to leave free (default: 1)
     #[arg(short = 'f', long, default_value_t = 1)]
     free_cores: usize,
+
+    /// Enable GPU heating (requires compatible GPU)
+    #[arg(short, long)]
+    gpu: bool,
 }
 
 fn main() {
···
     println!("Total CPU cores: {}", total_cores);
     println!("Cores to heat: {}", cores_to_use);
     println!("Cores to leave free: {}", args.free_cores);
+    if args.gpu {
+        println!("GPU heating: ENABLED");
+    }
 
     match args.duration {
         Some(seconds) => println!("Running for {} seconds", seconds),
···
 
     let start_time = Instant::now();
     let duration = args.duration.map(Duration::from_secs);
+
+    // Start GPU heating if requested
+    let gpu_handle = if args.gpu {
+        let running = running.clone();
+        Some(thread::spawn(move || {
+            match run_gpu_heater(running) {
+                Ok(_) => println!("GPU heater stopped successfully"),
+                Err(e) => eprintln!("GPU heater error: {}", e),
+            }
+        }))
+    } else {
+        None
+    };
 
     // Spawn threads to churn CPU
     let mut handles = vec![];
     for i in 0..cores_to_use {
         let running = running.clone();
         let handle = thread::spawn(move || {
-            println!("Thread {} started", i);
+            println!("CPU Thread {} started", i);
             let mut counter: u64 = 0;
             while running.load(Ordering::SeqCst) {
                 //compute something meaningless but CPU-intensive
···
                         .wrapping_rem(2147483648);
                 }
             }
-            println!("Thread {} stopped after {} iterations", i, counter);
+            println!("CPU Thread {} stopped after {} iterations", i, counter);
         });
         handles.push(handle);
     }
···
         for handle in handles {
             handle.join().unwrap();
         }
+        if let Some(handle) = gpu_handle {
+            handle.join().unwrap();
+        }
         return;
     }
 
···
     for handle in handles {
         handle.join().unwrap();
     }
+    if let Some(handle) = gpu_handle {
+        handle.join().unwrap();
+    }
 
     println!("Finished heating for {:?}", start_time.elapsed());
 }
+
+fn run_gpu_heater(running: Arc<AtomicBool>) -> Result<(), Box<dyn std::error::Error>> {
+    // Initialize GPU
+    let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor {
+        backends: wgpu::Backends::all(),
+        ..Default::default()
+    });
+
+    let adapter = pollster::block_on(instance.request_adapter(&wgpu::RequestAdapterOptions {
+        power_preference: wgpu::PowerPreference::HighPerformance,
+        compatible_surface: None,
+        force_fallback_adapter: false,
+    }));
+    
+    let adapter = match adapter {
+        Ok(a) => a,
+        Err(_) => return Err("Failed to find GPU adapter".into()),
+    };
+
+    println!("GPU: {} ({:?})", adapter.get_info().name, adapter.get_info().backend);
+
+    let (device, queue) = pollster::block_on(adapter.request_device(
+        &wgpu::DeviceDescriptor {
+            label: Some("GPU Heater Device"),
+            required_features: wgpu::Features::empty(),
+            required_limits: wgpu::Limits::default(),
+            memory_hints: Default::default(),
+            experimental_features: Default::default(),
+            trace: Default::default(),
+        },
+    ))?;
+
+    // Create compute shader that does intensive matrix operations
+    let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+        label: Some("GPU Heater Shader"),
+        source: wgpu::ShaderSource::Wgsl(include_str!("heater.wgsl").into()),
+    });
+
+    // Create buffers for computation
+    let buffer_size = 1024 * 1024 * 4; // 4MB of data
+    let input_buffer = device.create_buffer(&wgpu::BufferDescriptor {
+        label: Some("Input Buffer"),
+        size: buffer_size,
+        usage: wgpu::BufferUsages::STORAGE | wgpu::BufferUsages::COPY_DST,
+        mapped_at_creation: false,
+    });
+
+    let output_buffer = device.create_buffer(&wgpu::BufferDescriptor {
+        label: Some("Output Buffer"),
+        size: buffer_size,
+        usage: wgpu::BufferUsages::STORAGE | wgpu::BufferUsages::COPY_SRC,
+        mapped_at_creation: false,
+    });
+
+    let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+        label: Some("Compute Bind Group Layout"),
+        entries: &[
+            wgpu::BindGroupLayoutEntry {
+                binding: 0,
+                visibility: wgpu::ShaderStages::COMPUTE,
+                ty: wgpu::BindingType::Buffer {
+                    ty: wgpu::BufferBindingType::Storage { read_only: true },
+                    has_dynamic_offset: false,
+                    min_binding_size: None,
+                },
+                count: None,
+            },
+            wgpu::BindGroupLayoutEntry {
+                binding: 1,
+                visibility: wgpu::ShaderStages::COMPUTE,
+                ty: wgpu::BindingType::Buffer {
+                    ty: wgpu::BufferBindingType::Storage { read_only: false },
+                    has_dynamic_offset: false,
+                    min_binding_size: None,
+                },
+                count: None,
+            },
+        ],
+    });
+
+    let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+        label: Some("Compute Bind Group"),
+        layout: &bind_group_layout,
+        entries: &[
+            wgpu::BindGroupEntry {
+                binding: 0,
+                resource: input_buffer.as_entire_binding(),
+            },
+            wgpu::BindGroupEntry {
+                binding: 1,
+                resource: output_buffer.as_entire_binding(),
+            },
+        ],
+    });
+
+    let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+        label: Some("Compute Pipeline Layout"),
+        bind_group_layouts: &[&bind_group_layout],
+        push_constant_ranges: &[],
+    });
+
+    let compute_pipeline = device.create_compute_pipeline(&wgpu::ComputePipelineDescriptor {
+        label: Some("Compute Pipeline"),
+        layout: Some(&pipeline_layout),
+        module: &shader,
+        entry_point: Some("main"),
+        compilation_options: Default::default(),
+        cache: None,
+    });
+
+    println!("GPU heater started");
+    let mut iteration = 0u64;
+
+    // Main GPU compute loop
+    while running.load(Ordering::SeqCst) {
+        let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
+            label: Some("Compute Encoder"),
+        });
+
+        {
+            let mut compute_pass = encoder.begin_compute_pass(&wgpu::ComputePassDescriptor {
+                label: Some("Compute Pass"),
+                timestamp_writes: None,
+            });
+            compute_pass.set_pipeline(&compute_pipeline);
+            compute_pass.set_bind_group(0, &bind_group, &[]);
+            // Dispatch enough work to keep GPU busy
+            compute_pass.dispatch_workgroups(256, 256, 1);
+        }
+
+        queue.submit(Some(encoder.finish()));
+        // Queue submission handles synchronization
+
+        iteration += 1;
+        //if iteration % 100 == 0 {
+        //    println!("GPU iterations: {}", iteration);
+        //}
+    }
+
+    println!("GPU heater stopped after {} iterations", iteration);
+    Ok(())
+}