From b7a2d413a3f710f14accedf185c93bfb63d24fd0 Mon Sep 17 00:00:00 2001 From: Martin Möhrmann Date: Tue, 20 Oct 2020 09:56:14 +0200 Subject: testing: print cpu type as label for benchmarks MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Supports 386 and amd64 architectures on all operating systems. Example output: $ go test -bench=.* goos: darwin goarch: amd64 pkg: strconv cpu: Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz BenchmarkAtof64Decimal-4 24431032 46.8 ns/op ... As the displayed CPU information is only used for information purposes it is lazily initialized when needed using the new internal/sysinfo package. This allows internal/cpu to stay without dependencies and avoid initialization costs when the CPU information is not needed as the new code to query the CPU name in internal/cpu can be dead code eliminated if not used. Fixes #39214 Change-Id: I77ae5c5d2fed6b28fa78dd45075f9f0a6a7f1bfd Reviewed-on: https://go-review.googlesource.com/c/go/+/263804 Trust: Martin Möhrmann Reviewed-by: Keith Randall --- src/internal/sysinfo/sysinfo.go | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 src/internal/sysinfo/sysinfo.go (limited to 'src/internal/sysinfo/sysinfo.go') diff --git a/src/internal/sysinfo/sysinfo.go b/src/internal/sysinfo/sysinfo.go new file mode 100644 index 0000000000..961be7abae --- /dev/null +++ b/src/internal/sysinfo/sysinfo.go @@ -0,0 +1,31 @@ +// Copyright 2020 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package sysinfo implements high level hardware information gathering +// that can be used for debugging or information purposes. +package sysinfo + +import ( + internalcpu "internal/cpu" + "sync" +) + +type cpuInfo struct { + once sync.Once + name string +} + +var CPU cpuInfo + +func (cpu *cpuInfo) Name() string { + cpu.once.Do(func() { + // Try to get the information from internal/cpu. + if name := internalcpu.Name(); name != "" { + cpu.name = name + return + } + // TODO(martisch): use /proc/cpuinfo and /sys/devices/system/cpu/ on Linux as fallback. + }) + return cpu.name +} -- cgit v1.3