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testing: print cpu type as label for benchmarks

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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 <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Martin Möhrmann 2020-10-20 09:56:14 +02:00
parent 4f3b703af9
commit a41e26a438
3 changed files with 99 additions and 0 deletions
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19
cpu/cpu_no_name.go Normal file
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@ -0,0 +1,19 @@
// 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.
// +build !386
// +build !amd64
package cpu
// Name returns the CPU name given by the vendor
// if it can be read directly from memory or by CPU instructions.
// If the CPU name can not be determined an empty string is returned.
//
// Implementations that use the Operating System (e.g. sysctl or /sys/)
// to gather CPU information for display should be placed in internal/sysinfo.
func Name() string {
// "A CPU has no name".
return ""
}