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// Copyright 2020 The gVisor 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.
package fs
import (
"context"
"fmt"
"path/filepath"
"strings"
"testing"
"github.com/docker/docker/api/types/mount"
"gvisor.dev/gvisor/pkg/test/dockerutil"
"gvisor.dev/gvisor/test/benchmarks/harness"
"gvisor.dev/gvisor/test/benchmarks/tools"
)
// BenchmarkFio runs fio on the runtime under test. There are 4 basic test
// cases each run on a tmpfs mount and a bind mount. Fio requires root so that
// caches can be dropped.
func BenchmarkFio(b *testing.B) {
testCases := []tools.Fio{
tools.Fio{
Test: "write",
Size: "5G",
Blocksize: "1M",
Iodepth: 4,
},
tools.Fio{
Test: "read",
Size: "5G",
Blocksize: "1M",
Iodepth: 4,
},
tools.Fio{
Test: "randwrite",
Size: "5G",
Blocksize: "4K",
Iodepth: 4,
Time: 30,
},
tools.Fio{
Test: "randread",
Size: "5G",
Blocksize: "4K",
Iodepth: 4,
Time: 30,
},
}
machine, err := h.GetMachine()
if err != nil {
b.Fatalf("failed to get machine with: %v", err)
}
defer machine.CleanUp()
for _, fsType := range []mount.Type{mount.TypeBind, mount.TypeTmpfs} {
for _, tc := range testCases {
testName := strings.Title(tc.Test) + strings.Title(string(fsType))
b.Run(testName, func(b *testing.B) {
ctx := context.Background()
container := machine.GetContainer(ctx, b)
defer container.CleanUp(ctx)
// Directory and filename inside container where fio will read/write.
outdir := "/data"
outfile := filepath.Join(outdir, "test.txt")
// Make the required mount and grab a cleanup for bind mounts
// as they are backed by a temp directory (mktemp).
mnt, mountCleanup, err := makeMount(machine, fsType, outdir)
if err != nil {
b.Fatalf("failed to make mount: %v", err)
}
defer mountCleanup()
// Start the container with the mount.
if err := container.Spawn(
ctx,
dockerutil.RunOpts{
Image: "benchmarks/fio",
Mounts: []mount.Mount{
mnt,
},
},
// Sleep on the order of b.N.
"sleep", fmt.Sprintf("%d", 1000*b.N),
); err != nil {
b.Fatalf("failed to start fio container with: %v", err)
}
// For reads, we need a file to read so make one inside the container.
if strings.Contains(tc.Test, "read") {
fallocateCmd := fmt.Sprintf("fallocate -l %s %s", tc.Size, outfile)
if out, err := container.Exec(ctx, dockerutil.ExecOpts{},
strings.Split(fallocateCmd, " ")...); err != nil {
b.Fatalf("failed to create readable file on mount: %v, %s", err, out)
}
}
// Drop caches just before running.
if err := harness.DropCaches(machine); err != nil {
b.Skipf("failed to drop caches with %v. You probably need root.", err)
}
cmd := tc.MakeCmd(outfile)
container.RestartProfiles()
b.ResetTimer()
for i := 0; i < b.N; i++ {
// Run fio.
data, err := container.Exec(ctx, dockerutil.ExecOpts{}, cmd...)
if err != nil {
b.Fatalf("failed to run cmd %v: %v", cmd, err)
}
b.StopTimer()
tc.Report(b, data)
// If b.N is used (i.e. we run for an hour), we should drop caches
// after each run.
if err := harness.DropCaches(machine); err != nil {
b.Fatalf("failed to drop caches: %v", err)
}
b.StartTimer()
}
})
}
}
}
// makeMount makes a mount and cleanup based on the requested type. Bind
// and volume mounts are backed by a temp directory made with mktemp.
// tmpfs mounts require no such backing and are just made.
// It is up to the caller to call the returned cleanup.
func makeMount(machine harness.Machine, mountType mount.Type, target string) (mount.Mount, func(), error) {
switch mountType {
case mount.TypeVolume, mount.TypeBind:
dir, err := machine.RunCommand("mktemp", "-d")
if err != nil {
return mount.Mount{}, func() {}, fmt.Errorf("failed to create tempdir: %v", err)
}
dir = strings.TrimSuffix(dir, "\n")
out, err := machine.RunCommand("chmod", "777", dir)
if err != nil {
machine.RunCommand("rm", "-rf", dir)
return mount.Mount{}, func() {}, fmt.Errorf("failed modify directory: %v %s", err, out)
}
return mount.Mount{
Target: target,
Source: dir,
Type: mount.TypeBind,
}, func() { machine.RunCommand("rm", "-rf", dir) }, nil
case mount.TypeTmpfs:
return mount.Mount{
Target: target,
Type: mount.TypeTmpfs,
}, func() {}, nil
default:
return mount.Mount{}, func() {}, fmt.Errorf("illegal mount time not supported: %v", mountType)
}
}
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