134 lines
3.0 KiB
Go
134 lines
3.0 KiB
Go
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// run-parallel is a tool to run an executable with the provided templated
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// arguments across all the hardware threads.
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package main
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import (
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"flag"
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"fmt"
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"os"
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"os/exec"
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"runtime"
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"strings"
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"sync"
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)
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func main() {
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if err := run(); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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func showUsage() {
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fmt.Println(`
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run-parallel is a tool to run an executable with the provided templated
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arguments across all the hardware threads.
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Usage:
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run-parallel <executable> [arguments...] -- [per-instance-value...]
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executable - the path to the executable to run.
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arguments - a list of arguments to pass to the executable.
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Any occurrance of $ will be substituted with the
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per-instance-value for the given invocation.
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per-instance-value - a list of values. The executable will be invoked for each
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value in this list.`)
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os.Exit(1)
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}
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func run() error {
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onlyPrintFailures := flag.Bool("only-print-failures", false, "Omit output for processes that did not fail")
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flag.Parse()
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args := flag.Args()
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if len(args) < 2 {
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showUsage()
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}
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exe := args[0]
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args = args[1:]
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var perInstanceValues []string
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for i, arg := range args {
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if arg == "--" {
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perInstanceValues = args[i+1:]
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args = args[:i]
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break
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}
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}
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if perInstanceValues == nil {
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showUsage()
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}
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taskIndices := make(chan int, 64)
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type result struct {
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msg string
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failed bool
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}
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results := make([]result, len(perInstanceValues))
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numCPU := runtime.NumCPU()
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wg := sync.WaitGroup{}
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wg.Add(numCPU)
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for i := 0; i < numCPU; i++ {
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go func() {
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defer wg.Done()
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for idx := range taskIndices {
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taskArgs := make([]string, len(args))
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for i, arg := range args {
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taskArgs[i] = strings.ReplaceAll(arg, "$", perInstanceValues[idx])
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}
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success, out := invoke(exe, taskArgs)
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if !success || !*onlyPrintFailures {
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results[idx] = result{out, !success}
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}
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}
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}()
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}
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for i := range perInstanceValues {
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taskIndices <- i
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}
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close(taskIndices)
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wg.Wait()
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failed := false
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for _, result := range results {
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if result.msg != "" {
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fmt.Println(result.msg)
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}
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failed = failed || result.failed
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}
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if failed {
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os.Exit(1)
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}
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return nil
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}
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func invoke(exe string, args []string) (ok bool, output string) {
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cmd := exec.Command(exe, args...)
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out, err := cmd.CombinedOutput()
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str := string(out)
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if err != nil {
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if str != "" {
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return false, str
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}
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return false, err.Error()
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}
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return true, str
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}
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