66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
// Copyright 2020 The gVisor 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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package tools
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import (
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"fmt"
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"net"
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"regexp"
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"strconv"
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"testing"
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)
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const length = 64 * 1024
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// Iperf is for the client side of `iperf`.
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type Iperf struct {
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Num int // Number of bytes to send in KB.
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}
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// MakeCmd returns a iperf client command.
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func (i *Iperf) MakeCmd(ip net.IP, port int) []string {
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return []string{
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"iperf",
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"--format", "K", // Output in KBytes.
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"--realtime", // Measured in realtime.
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"--num", fmt.Sprintf("%dK", i.Num), // Number of bytes to send in KB.
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"--length", fmt.Sprintf("%d", length),
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"--client", ip.String(),
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"--port", fmt.Sprintf("%d", port),
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}
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}
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// Report parses output from iperf client and reports metrics.
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func (i *Iperf) Report(b *testing.B, output string) {
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b.Helper()
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// Parse bandwidth and report it.
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bW, err := i.bandwidth(output)
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if err != nil {
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b.Fatalf("failed to parse bandwitdth from %s: %v", output, err)
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}
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b.SetBytes(length) // Measure Bytes/sec for b.N, although below is iperf output.
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ReportCustomMetric(b, bW*1024, "bandwidth" /*metric name*/, "bytes_per_second" /*unit*/)
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}
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// bandwidth parses the Bandwidth number from an iperf report. A sample is below.
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func (i *Iperf) bandwidth(data string) (float64, error) {
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re := regexp.MustCompile(`\[\s*\d+\][^\n]+\s+(\d+\.?\d*)\s+KBytes/sec`)
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match := re.FindStringSubmatch(data)
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if len(match) < 1 {
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return 0, fmt.Errorf("failed get bandwidth: %s", data)
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}
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return strconv.ParseFloat(match[1], 64)
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}
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