mirror of
https://github.com/henrygd/beszel.git
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126 lines
4.0 KiB
Go
126 lines
4.0 KiB
Go
//go:build linux
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package agent
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import (
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"fmt"
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"os"
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"path/filepath"
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"testing"
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"time"
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"github.com/henrygd/beszel/internal/entities/system"
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"github.com/shirou/gopsutil/v4/disk"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// Linux prints four millisecond fields of /proc/diskstats as 32-bit unsigned ints:
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// read time, write time, io time and weighted io time. They wrap to zero at 2^32.
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func TestUpdateDiskIoTimeCounterWrap(t *testing.T) {
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const wrap = uint64(1) << 32
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tests := []struct {
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name string
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base uint64 // added to every previous time counter
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}{
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{"no wrap", 0},
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{"32-bit wrap", wrap - 1000},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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// Deltas over 60s: read 300ms / 10 ops, write 400ms / 20 ops,
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// io time 1200ms, weighted io 3000ms.
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prev := prevDisk{
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readBytes: 20000 * 512,
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writeBytes: 10000 * 512,
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readTime: tt.base + 900,
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writeTime: tt.base + 700,
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ioTime: tt.base + 400,
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weightedIO: tt.base,
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readCount: 1000,
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writeCount: 500,
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at: time.Now().Add(-60 * time.Second),
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}
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cur := func(v uint64) uint64 { return v % wrap }
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line := fmt.Sprintf(" 8 0 sda %d 0 %d %d %d 0 %d %d 0 %d %d\n",
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1010, 21200, cur(prev.readTime+300),
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520, 10400, cur(prev.writeTime+400),
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cur(prev.ioTime+1200), cur(prev.weightedIO+3000))
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dir := t.TempDir()
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require.NoError(t, os.WriteFile(filepath.Join(dir, "diskstats"), []byte(line), 0o644))
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t.Setenv("HOST_PROC", dir)
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t.Setenv("HOST_SYS", dir)
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t.Setenv("HOST_DEV", dir)
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t.Setenv("HOST_RUN", dir)
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fs := &system.FsStats{Root: true}
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a := &Agent{
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fsNames: []string{"sda"},
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fsStats: map[string]*system.FsStats{"sda": fs},
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diskPrev: map[uint16]map[string]prevDisk{60000: {"sda": prev}},
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}
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var stats system.Stats
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a.updateDiskIo(60000, &stats)
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// Same order as DiskIoStats in system.FsStats.
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want := [6]float64{0.5, 0.67, 2, 30, 20, 5}
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for i := range want {
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assert.InDelta(t, want[i], fs.DiskIoStats[i], 0.01, "DiskIoStats[%d]", i)
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assert.InDelta(t, want[i], stats.DiskIoStats[i], 0.01, "system DiskIoStats[%d]", i)
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}
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})
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}
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}
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// The first sample of a cache interval has no snapshot of its own. It must
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// measure the time counters from the same baseline as the byte counters.
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func TestUpdateDiskIoFirstSampleOfInterval(t *testing.T) {
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dir := t.TempDir()
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t.Setenv("HOST_PROC", dir)
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t.Setenv("HOST_SYS", dir)
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t.Setenv("HOST_DEV", dir)
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t.Setenv("HOST_RUN", dir)
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writeDiskstats := func(line string) {
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require.NoError(t, os.WriteFile(filepath.Join(dir, "diskstats"), []byte(line), 0o644))
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}
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writeDiskstats(" 8 0 sda 1000 0 20000 900 500 0 10000 700 0 400 0\n")
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counters, err := disk.IOCounters("sda")
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require.NoError(t, err)
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fs := &system.FsStats{Root: true}
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a := &Agent{
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fsStats: map[string]*system.FsStats{"sda": fs},
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diskPrev: map[uint16]map[string]prevDisk{},
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}
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a.initializeDiskIoStats(counters)
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// updateDiskIo skips samples less than 100ms apart.
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time.Sleep(150 * time.Millisecond)
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// Deltas: read 300ms / 10 ops, write 400ms / 20 ops, io time 1200ms, weighted io 3000ms.
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writeDiskstats(" 8 0 sda 1010 0 21200 1200 520 0 10400 1100 0 1600 3000\n")
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var stats system.Stats
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a.updateDiskIo(60000, &stats)
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require.NotZero(t, fs.DiskReadBytes, "bytes are measured from the baseline")
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for i := range 3 {
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assert.NotZero(t, fs.DiskIoStats[i], "DiskIoStats[%d]", i)
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}
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assert.InDelta(t, 30, fs.DiskIoStats[3], 0.01, "r_await")
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assert.InDelta(t, 20, fs.DiskIoStats[4], 0.01, "w_await")
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assert.NotZero(t, fs.DiskIoStats[5], "weighted io")
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// A second interval starts from the latest counters, not from the ones at start.
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time.Sleep(150 * time.Millisecond)
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// Deltas: read 100ms / 10 ops, write 100ms / 20 ops.
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writeDiskstats(" 8 0 sda 1020 0 22400 1300 540 0 10800 1200 0 1800 3500\n")
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a.updateDiskIo(1000, &stats)
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assert.InDelta(t, 10, fs.DiskIoStats[3], 0.01, "r_await")
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assert.InDelta(t, 5, fs.DiskIoStats[4], 0.01, "w_await")
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}
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