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// Copyright 2022 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package procfs
import (
"reflect"
"sort"
"strconv"
"testing"
)
var (
testPID = int(27079)
testTIDS = [...]int{27079, 27080, 27081, 27082, 27083}
)
func TestAllThreads(t *testing.T) {
fixFS := getProcFixtures(t)
threads, err := fixFS.AllThreads(testPID)
if err != nil {
t.Fatal(err)
}
sort.Sort(threads)
for i, tid := range testTIDS {
if wantTID, haveTID := tid, threads[i].PID; wantTID != haveTID {
t.Errorf("want TID %d, have %d", wantTID, haveTID)
}
wantFS := fixFS.proc.Path(strconv.Itoa(testPID), "task")
haveFS := string(threads[i].fs.proc)
if wantFS != haveFS {
t.Errorf("want fs %q, have %q", wantFS, haveFS)
}
}
}
func TestThreadStat(t *testing.T) {
// Pull process and thread stats.
proc, err := getProcFixtures(t).Proc(testPID)
if err != nil {
t.Fatal(err)
}
procStat, err := proc.Stat()
if err != nil {
t.Fatal(err)
}
threads, err := getProcFixtures(t).AllThreads(testPID)
if err != nil {
t.Fatal(err)
}
sort.Sort(threads)
threadStats := make([]*ProcStat, len(threads))
for i, thread := range threads {
threadStat, err := thread.Stat()
if err != nil {
t.Fatal(err)
}
threadStats[i] = &threadStat
}
// The following fields should be shared between the process and its thread:
procStatValue := reflect.ValueOf(procStat)
sharedFields := [...]string{
"PPID",
"PGRP",
"Session",
"TTY",
"TPGID",
"VSize",
"RSS",
}
for i, thread := range threads {
threadStatValue := reflect.ValueOf(threadStats[i]).Elem()
for _, f := range sharedFields {
if want, have := procStatValue.FieldByName(f), threadStatValue.FieldByName(f); want.Interface() != have.Interface() {
t.Errorf("TID %d, want %s %#v, have %#v", thread.PID, f, want, have)
}
}
}
// Thread specific fields:
for i, thread := range threads {
if want, have := thread.PID, threadStats[i].PID; want != have {
t.Errorf("TID %d, want PID %d, have %d", thread.PID, want, have)
}
}
// Finally exemplify the relationship between process and constituent
// threads CPU times: each the former ~ the sum of the corresponding
// latter. Require -v flag.
totalUTime, totalSTime := uint(0), uint(0)
for _, thread := range threads {
threadStat, err := thread.Stat()
if err != nil {
t.Fatal(err)
}
t.Logf("TID %d, UTime %d, STime %d", thread.PID, threadStat.UTime, threadStat.STime)
totalUTime += threadStat.UTime
totalSTime += threadStat.STime
}
t.Logf("PID %d, UTime %d, STime %d, total threads UTime %d, STime %d", proc.PID, procStat.UTime, procStat.STime, totalUTime, totalSTime)
}
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