telegraf/plugins/inputs/cpu/cpu_test.go

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package cpu
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import (
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"fmt"
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"testing"
"github.com/influxdata/telegraf/plugins/inputs/system"
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"github.com/influxdata/telegraf/testutil"
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"github.com/shirou/gopsutil/cpu"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestCPUStats(t *testing.T) {
var mps system.MockPS
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defer mps.AssertExpectations(t)
var acc testutil.Accumulator
cts := cpu.TimesStat{
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CPU: "cpu0",
User: 8.8,
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System: 8.2,
Idle: 80.1,
Nice: 1.3,
Iowait: 0.8389,
Irq: 0.6,
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Softirq: 0.11,
Steal: 0.0511,
Guest: 3.1,
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GuestNice: 0.324,
}
cts2 := cpu.TimesStat{
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CPU: "cpu0",
User: 24.9, // increased by 16.1
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System: 10.9, // increased by 2.7
Idle: 157.9798, // increased by 77.8798 (for total increase of 100)
Nice: 3.5, // increased by 2.2
Iowait: 0.929, // increased by 0.0901
Irq: 1.2, // increased by 0.6
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Softirq: 0.31, // increased by 0.2
Steal: 0.2812, // increased by 0.2301
Guest: 11.4, // increased by 8.3
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GuestNice: 2.524, // increased by 2.2
}
mps.On("CPUTimes").Return([]cpu.TimesStat{cts}, nil)
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cs := NewCPUStats(&mps)
cputags := map[string]string{
"cpu": "cpu0",
}
err := cs.Gather(&acc)
require.NoError(t, err)
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// Computed values are checked with delta > 0 because of floating point arithmatic
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// imprecision
assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 8.8, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_system", 8.2, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 80.1, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_active", 19.9, 0.0005, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_nice", 1.3, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 0.8389, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_irq", 0.6, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_softirq", 0.11, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_steal", 0.0511, 0, cputags)
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 := system.MockPS{}
mps2.On("CPUTimes").Return([]cpu.TimesStat{cts2}, nil)
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cs.ps = &mps2
// Should have added cpu percentages too
err = cs.Gather(&acc)
require.NoError(t, err)
assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 24.9, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_system", 10.9, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 157.9798, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_active", 42.0202, 0.0005, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_nice", 3.5, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 0.929, 0, cputags)
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assertContainsTaggedFloat(t, &acc, "cpu", "time_irq", 1.2, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_softirq", 0.31, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_steal", 0.2812, 0, cputags)
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)
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)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_idle", 77.8798, 0.0005, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_active", 22.1202, 0.0005, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_nice", 0, 0.0005, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_iowait", 0.0901, 0.0005, cputags)
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)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_steal", 0.2301, 0.0005, cputags)
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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// Asserts that a given accumulator contains a measurment of type float64 with
// specific tags within a certain distance of a given expected value. Asserts a failure
// if the measurement is of the wrong type, or if no matching measurements are found
//
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// Parameters:
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// t *testing.T : Testing object to use
// acc testutil.Accumulator: Accumulator to examine
// measurement string : Name of the measurement to examine
// expectedValue float64 : Value to search for within the measurement
// delta float64 : Maximum acceptable distance of an accumulated value
// from the expectedValue parameter. Useful when
// floating-point arithmatic imprecision makes looking
// for an exact match impractical
// tags map[string]string : Tag set the found measurement must have. Set to nil to
// ignore the tag set.
func assertContainsTaggedFloat(
t *testing.T,
acc *testutil.Accumulator,
measurement string,
field string,
expectedValue float64,
delta float64,
tags map[string]string,
) {
var actualValue float64
for _, pt := range acc.Metrics {
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if pt.Measurement == measurement {
for fieldname, value := range pt.Fields {
if fieldname == field {
if value, ok := value.(float64); ok {
actualValue = value
if (value >= expectedValue-delta) && (value <= expectedValue+delta) {
// Found the point, return without failing
return
}
} else {
assert.Fail(t, fmt.Sprintf("Measurement \"%s\" does not have type float64",
measurement))
}
}
}
}
}
msg := fmt.Sprintf(
"Could not find measurement \"%s\" with requested tags within %f of %f, Actual: %f",
measurement, delta, expectedValue, actualValue)
assert.Fail(t, msg)
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}
// TestCPUCountChange tests that no errors are encountered if the number of
// CPUs increases as reported with LXC.
func TestCPUCountIncrease(t *testing.T) {
var mps system.MockPS
var mps2 system.MockPS
var acc testutil.Accumulator
var err error
cs := NewCPUStats(&mps)
mps.On("CPUTimes").Return(
[]cpu.TimesStat{
{
CPU: "cpu0",
},
}, nil)
err = cs.Gather(&acc)
require.NoError(t, err)
mps2.On("CPUTimes").Return(
[]cpu.TimesStat{
{
CPU: "cpu0",
},
{
CPU: "cpu1",
},
}, nil)
cs.ps = &mps2
err = cs.Gather(&acc)
require.NoError(t, err)
}
// TestCPUTimesDecrease tests that telegraf continue to works after
// CPU times decrease, which seems to occur when Linux system is suspended.
func TestCPUTimesDecrease(t *testing.T) {
var mps system.MockPS
defer mps.AssertExpectations(t)
var acc testutil.Accumulator
cts := cpu.TimesStat{
CPU: "cpu0",
User: 18,
Idle: 80,
Iowait: 2,
}
cts2 := cpu.TimesStat{
CPU: "cpu0",
User: 38, // increased by 20
Idle: 40, // decreased by 40
Iowait: 1, // decreased by 1
}
cts3 := cpu.TimesStat{
CPU: "cpu0",
User: 56, // increased by 18
Idle: 120, // increased by 80
Iowait: 3, // increased by 2
}
mps.On("CPUTimes").Return([]cpu.TimesStat{cts}, nil)
cs := NewCPUStats(&mps)
cputags := map[string]string{
"cpu": "cpu0",
}
err := cs.Gather(&acc)
require.NoError(t, err)
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// Computed values are checked with delta > 0 because of floating point arithmatic
// imprecision
assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 18, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 80, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 2, 0, cputags)
mps2 := system.MockPS{}
mps2.On("CPUTimes").Return([]cpu.TimesStat{cts2}, nil)
cs.ps = &mps2
// CPU times decreased. An error should be raised
err = cs.Gather(&acc)
require.Error(t, err)
mps3 := system.MockPS{}
mps3.On("CPUTimes").Return([]cpu.TimesStat{cts3}, nil)
cs.ps = &mps3
err = cs.Gather(&acc)
require.NoError(t, err)
assertContainsTaggedFloat(t, &acc, "cpu", "time_user", 56, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_idle", 120, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "time_iowait", 3, 0, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_user", 18, 0.0005, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_idle", 80, 0.0005, cputags)
assertContainsTaggedFloat(t, &acc, "cpu", "usage_iowait", 2, 0.0005, cputags)
}