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