61 lines
1.8 KiB
Go
61 lines
1.8 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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"regexp"
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"strconv"
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"testing"
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)
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// Meminfo wraps measurements of MemAvailable using /proc/meminfo.
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type Meminfo struct {
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}
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// MakeCmd returns a command for checking meminfo.
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func (*Meminfo) MakeCmd() (string, []string) {
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return "cat", []string{"/proc/meminfo"}
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}
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// Report takes two reads of meminfo, parses them, and reports the difference
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// divided by b.N.
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func (*Meminfo) Report(b *testing.B, before, after string) {
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b.Helper()
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beforeVal, err := parseMemAvailable(before)
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if err != nil {
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b.Fatalf("could not parse before value %s: %v", before, err)
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}
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afterVal, err := parseMemAvailable(after)
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if err != nil {
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b.Fatalf("could not parse before value %s: %v", before, err)
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}
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val := 1024 * ((beforeVal - afterVal) / float64(b.N))
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ReportCustomMetric(b, val, "average_container_size" /*metric name*/, "bytes" /*units*/)
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}
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var memInfoRE = regexp.MustCompile(`MemAvailable:\s*(\d+)\skB\n`)
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// parseMemAvailable grabs the MemAvailable number from /proc/meminfo.
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func parseMemAvailable(data string) (float64, error) {
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match := memInfoRE.FindStringSubmatch(data)
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if len(match) < 2 {
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return 0, fmt.Errorf("couldn't find MemAvailable in %s", data)
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}
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return strconv.ParseFloat(match[1], 64)
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}
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