mirror of
https://github.com/tailscale/tailscale.git
synced 2026-09-15 23:42:48 -04:00
Brad Fitzpatrick
af4b7b0363
To decide whether we can bump GOAMD64 for our production binaries, we first need to know what x86-64 microarchitecture levels the fleet's CPUs actually support. Add two gauges to the default metric set on linux/amd64: goamd64_capable, the maximum GOAMD64 level the host CPU supports per /proc/cpuinfo, and goamd64_compiled, the level the running binary was built with per its build info. Both are computed once at init and report 0 on error. The per-level feature lists match the checks in Go's runtime/asm_amd64.s. Updates tailscale/corp#47099 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I3b4e5431ae1501f0b7d584c12d9af805e9ab6125
76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !android
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package varz
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import (
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"strings"
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"testing"
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)
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const v4Flags = "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov " +
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"pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm " +
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"constant_tsc rep_good nopl xtopology nonstop_tsc cpuid aperfmperf " +
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"tsc_known_freq pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic " +
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"movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor " +
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"lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase tsc_adjust bmi1 " +
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"avx2 smep bmi2 erms invpcid avx512f avx512dq rdseed adx smap clflushopt " +
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"clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves"
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func withoutFlags(flags string, remove ...string) []string {
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var out []string
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fs := strings.Fields(flags)
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Outer:
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for _, f := range fs {
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for _, r := range remove {
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if f == r {
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continue Outer
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}
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}
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out = append(out, f)
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}
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return out
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}
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func TestGoAMD64Level(t *testing.T) {
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tests := []struct {
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name string
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flags []string
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want int
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}{
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{"v4", withoutFlags(v4Flags), 4},
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{"v3_no_avx512vl", withoutFlags(v4Flags, "avx512vl"), 3},
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{"v3_no_avx512", withoutFlags(v4Flags, "avx512f", "avx512dq", "avx512cd", "avx512bw", "avx512vl"), 3},
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{"v2_no_avx2", withoutFlags(v4Flags, "avx512f", "avx2"), 2},
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{"v2_no_abm", withoutFlags(v4Flags, "avx512bw", "abm"), 2},
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{"v1_no_popcnt", withoutFlags(v4Flags, "avx2", "popcnt"), 1},
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{"v1_no_sse42", withoutFlags(v4Flags, "sse4_2"), 1},
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{"empty", nil, 1},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := goamd64Level(tt.flags); got != tt.want {
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t.Errorf("goamd64Level = %d; want %d", got, tt.want)
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}
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})
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}
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}
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func TestHostGOAMD64Level(t *testing.T) {
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got := hostGOAMD64Level()
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t.Logf("hostGOAMD64Level = %d", got)
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if got < 0 || got > 4 {
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t.Errorf("out of range [0,4]")
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}
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}
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func TestCompiledGOAMD64Level(t *testing.T) {
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got := compiledGOAMD64Level()
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t.Logf("compiledGOAMD64Level = %d", got)
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if got < 1 || got > 4 {
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t.Errorf("got %d; want in range [1,4] since test binaries have build info", got)
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}
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}
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