cpu

README

cpu

internal/cpu(in Go standard lib) with these detections:

• AVX512

• Cache Size

• Invariant TSC

It also provides false sharing range, see X86FalseSharingRange for X86 platform.

Acknowledgement

klauspost/cpuid

Documentation

Overview

Package cpu implements processor feature detection used by the Go standard library.

Index

• Constants
• Variables
• type Cache

Constants

const (
	Other = iota
	Intel
	AMD
	VIA
	Transmeta
	NSC
	KVM  // Kernel-based Virtual Machine
	MSVM // Microsoft Hyper-V or Windows Virtual PC
	VMware
	XenHVM
	Bhyve
	Hygon
)

const CacheLineSize = 64

const GOARCH = "amd64"

const X86FalseSharingRange = 128

"Loads data or instructions from memory to the second-level cache. To use the streamer, organize the data or instructions in blocks of 128 bytes, aligned on 128 bytes." From <Intel® 64 and IA-32 architectures optimization reference manual>, in section 3.7.3 "Hardware Prefetching for Second-Level Cache"

In practice, I have found use 128bytes can gain better performance than 64bytes (one cache line).

Variables

var ARM64 arm64

var PPC64 ppc64

var S390X s390x

var X86 x86

Types

type Cache

type Cache struct {
	L1I int
	L1D int
	L2  int
	L3  int
}

CPU Cache Size. -1 if undetected.