Fix improper total of CPU times (#2123)
On linux, the cpu timer counters of user and nice include the respective guest and guest_nice counters. This results in improper calculation of percentages. Please see: https://github.com/torvalds/linux/blob/447976e/kernel/sched/cputime.c#L169 https://lists.linuxfoundation.org/pipermail/virtualization/2009-August/013459.html https://github.com/giampaolo/psutil/pull/940
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Foxlik
Cameron Sparr
parent
504f4e69db
commit
5a3f2e61f3
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@ -4,6 +4,7 @@
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### Features
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- [#2123](https://github.com/influxdata/telegraf/pull/2123): Fix improper calculation of CPU percentages
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- [#1564](https://github.com/influxdata/telegraf/issues/1564): Use RFC3339 timestamps in log output.
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- [#1997](https://github.com/influxdata/telegraf/issues/1997): Non-default HTTP timeouts for RabbitMQ plugin.
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- [#2074](https://github.com/influxdata/telegraf/pull/2074): "discard" output plugin added, primarily for testing purposes.
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@ -91,10 +91,10 @@ func (s *CPUStats) Gather(acc telegraf.Accumulator) error {
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continue
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}
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fieldsG := map[string]interface{}{
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"usage_user": 100 * (cts.User - lastCts.User) / totalDelta,
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"usage_user": 100 * (cts.User - lastCts.User - (cts.Guest - lastCts.Guest)) / totalDelta,
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"usage_system": 100 * (cts.System - lastCts.System) / totalDelta,
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"usage_idle": 100 * (cts.Idle - lastCts.Idle) / totalDelta,
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"usage_nice": 100 * (cts.Nice - lastCts.Nice) / totalDelta,
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"usage_nice": 100 * (cts.Nice - lastCts.Nice - (cts.GuestNice - lastCts.GuestNice)) / totalDelta,
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"usage_iowait": 100 * (cts.Iowait - lastCts.Iowait) / totalDelta,
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"usage_irq": 100 * (cts.Irq - lastCts.Irq) / totalDelta,
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"usage_softirq": 100 * (cts.Softirq - lastCts.Softirq) / totalDelta,
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@ -112,7 +112,7 @@ func (s *CPUStats) Gather(acc telegraf.Accumulator) error {
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func totalCpuTime(t cpu.TimesStat) float64 {
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total := t.User + t.System + t.Nice + t.Iowait + t.Irq + t.Softirq + t.Steal +
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t.Guest + t.GuestNice + t.Idle
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t.Idle
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return total
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}
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@ -17,29 +17,29 @@ func TestCPUStats(t *testing.T) {
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cts := cpu.TimesStat{
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CPU: "cpu0",
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User: 3.1,
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User: 8.8,
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System: 8.2,
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Idle: 80.1,
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Nice: 1.3,
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Iowait: 0.2,
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Irq: 0.1,
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Iowait: 0.8389,
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Irq: 0.6,
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Softirq: 0.11,
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Steal: 0.0511,
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Guest: 8.1,
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Guest: 3.1,
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GuestNice: 0.324,
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}
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cts2 := cpu.TimesStat{
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CPU: "cpu0",
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User: 11.4, // increased by 8.3
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User: 24.9, // increased by 16.1
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System: 10.9, // increased by 2.7
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Idle: 158.8699, // increased by 78.7699 (for total increase of 100)
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Nice: 2.5, // increased by 1.2
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Iowait: 0.7, // increased by 0.5
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Irq: 1.2, // increased by 1.1
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Idle: 157.9798, // increased by 77.8798 (for total increase of 100)
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Nice: 3.5, // increased by 2.2
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Iowait: 0.929, // increased by 0.0901
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Irq: 1.2, // increased by 0.6
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Softirq: 0.31, // increased by 0.2
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Steal: 0.2812, // increased by 0.0001
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Guest: 12.9, // increased by 4.8
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Steal: 0.2812, // increased by 0.2301
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Guest: 11.4, // increased by 8.3
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GuestNice: 2.524, // increased by 2.2
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}
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@ -56,15 +56,15 @@ func TestCPUStats(t *testing.T) {
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// Computed values are checked with delta > 0 becasue of floating point arithmatic
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// imprecision
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assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 3.1, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 8.8, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_system", 8.2, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 80.1, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_nice", 1.3, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 0.2, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_irq", 0.1, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 0.8389, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_irq", 0.6, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_softirq", 0.11, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_steal", 0.0511, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_guest", 8.1, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_guest", 3.1, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_guest_nice", 0.324, 0, cputags)
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mps2 := MockPS{}
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@ -75,26 +75,26 @@ func TestCPUStats(t *testing.T) {
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err = cs.Gather(&acc)
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require.NoError(t, err)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 11.4, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 24.9, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_system", 10.9, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 158.8699, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_nice", 2.5, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 0.7, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 157.9798, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_nice", 3.5, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 0.929, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_irq", 1.2, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_softirq", 0.31, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_steal", 0.2812, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_guest", 12.9, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_guest", 11.4, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_guest_nice", 2.524, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_user", 8.3, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_user", 7.8, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_system", 2.7, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_idle", 78.7699, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_nice", 1.2, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_iowait", 0.5, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_irq", 1.1, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_idle", 77.8798, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_nice", 0, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_iowait", 0.0901, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_irq", 0.6, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_softirq", 0.2, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_steal", 0.2301, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_guest", 4.8, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_guest", 8.3, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "usage_guest_nice", 2.2, 0.0005, cputags)
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}
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