Processor

Recipe	Crates	Categories
Check the Number of Logical cpu Cores
SIMD (Single Instruction, Multiple Data) Operations

Key Points

Rust generally doesn't require direct CPU manipulation. The compiler and standard library provide good abstractions.
SIMD and atomic operations are important for performance.
Direct access to CPU features (like inline assembly) is usually only necessary for very specialized or performance-critical code. Avoid it if you can.

CPU Identification

cpuid⮳: A crate for getting CPU information (vendor, features, etc.)

Check the Number of Logical cpu Cores

Shows the number of logical CPU cores in the current machine using num_cpus::get⮳.

/// This example demonstrates how to get the number of logical cores on the
/// system. It uses the `num_cpus` crate.
fn main() {
    println!("Number of logical cores is {}", num_cpus::get());
}

Low-Level Programming and Optimization

Inline Assembly

You can use inline assembly in Rust with the asm! macro, but it's generally discouraged unless absolutely necessary for performance reasons. It makes code less portable.

Compiler Intrinsics

Compiler intrinsics are functions that map directly to CPU instructions. They're often used for low-level optimization. Access to intrinsics is usually through std::arch.

SIMD (Single Instruction, Multiple Data) Operations

std::arch: (Standard library) Provides access to SIMD instructions if the target CPU supports them. This is essential for performance optimization.

packed_simd⮳: A crate for portable SIMD.

Memory Model

Understanding the CPU's memory model is important for writing correct concurrent code. See Memory Management.

Operating System Interaction

System calls are used to interact with the operating system, which in turn interacts with the CPU. See OS.

Embedded Systems Programming

In embedded systems, you often have more direct access to CPU features and peripherals. See the Embedded Systems section for relevant crates.

The Rust How-to Book