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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package parallel_test
import (
"sort"
"sync"
"sync/atomic"
stdtesting "testing"
"time"
"github.com/juju/testing"
gc "gopkg.in/check.v1"
"github.com/juju/utils/v2/parallel"
)
type parallelSuite struct {
testing.IsolationSuite
}
var _ = gc.Suite(¶llelSuite{})
func (*parallelSuite) TestParallelMaxPar(c *gc.C) {
const (
totalDo = 10
maxConcurrentRunnersPar = 3
)
var mu sync.Mutex
maxConcurrentRunners := 0
nbRunners := 0
nbRuns := 0
parallelRunner := parallel.NewRun(maxConcurrentRunnersPar)
for i := 0; i < totalDo; i++ {
parallelRunner.Do(func() error {
mu.Lock()
nbRuns++
nbRunners++
if nbRunners > maxConcurrentRunners {
maxConcurrentRunners = nbRunners
}
mu.Unlock()
time.Sleep(time.Second / 10)
mu.Lock()
nbRunners--
mu.Unlock()
return nil
})
}
err := parallelRunner.Wait()
if nbRunners != 0 {
c.Errorf("%d functions still running", nbRunners)
}
if nbRuns != totalDo {
c.Errorf("all functions not executed; want %d got %d", totalDo, nbRuns)
}
c.Check(err, gc.IsNil)
if maxConcurrentRunners != maxConcurrentRunnersPar {
c.Errorf("wrong number of do's ran at once; want %d got %d", maxConcurrentRunnersPar, maxConcurrentRunners)
}
}
func nothing() error {
return nil
}
func BenchmarkRunSingle(b *stdtesting.B) {
for i := 0; i < b.N; i++ {
r := parallel.NewRun(1)
r.Do(nothing)
r.Wait()
}
}
func BenchmarkRun1000p100(b *stdtesting.B) {
for i := 0; i < b.N; i++ {
r := parallel.NewRun(100)
for j := 0; j < 1000; j++ {
r.Do(nothing)
}
r.Wait()
}
}
func (*parallelSuite) TestConcurrentDo(c *gc.C) {
r := parallel.NewRun(3)
var count int32
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
r.Do(func() error {
atomic.AddInt32(&count, 1)
return nil
})
wg.Done()
}()
}
wg.Wait()
err := r.Wait()
c.Assert(err, gc.IsNil)
c.Assert(count, gc.Equals, int32(100))
}
type intError int
func (intError) Error() string {
return "error"
}
func (*parallelSuite) TestParallelError(c *gc.C) {
const (
totalDo = 10
errDo = 5
)
parallelRun := parallel.NewRun(6)
for i := 0; i < totalDo; i++ {
i := i
if i >= errDo {
parallelRun.Do(func() error {
return intError(i)
})
} else {
parallelRun.Do(func() error {
return nil
})
}
}
err := parallelRun.Wait()
c.Check(err, gc.NotNil)
errs := err.(parallel.Errors)
c.Check(len(errs), gc.Equals, totalDo-errDo)
ints := make([]int, len(errs))
for i, err := range errs {
ints[i] = int(err.(intError))
}
sort.Ints(ints)
for i, n := range ints {
c.Check(n, gc.Equals, i+errDo)
}
}
func (*parallelSuite) TestZeroWorkerPanics(c *gc.C) {
defer func() {
r := recover()
c.Check(r, gc.Matches, "parameter max must be >= 1")
}()
parallel.NewRun(0)
}
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