github.com/nats-io/nats-server/v2@v2.11.0-preview.2/server/pse/pse_windows_test.go (about)

     1  // Copyright 2015-2018 The NATS Authors
     2  // Licensed under the Apache License, Version 2.0 (the "License");
     3  // you may not use this file except in compliance with the License.
     4  // You may obtain a copy of the License at
     5  //
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  //go:build windows
    15  // +build windows
    16  
    17  package pse
    18  
    19  import (
    20  	"fmt"
    21  	"os/exec"
    22  	"runtime"
    23  	"strconv"
    24  	"strings"
    25  	"testing"
    26  )
    27  
    28  func checkValues(t *testing.T, pcpu, tPcpu float64, rss, tRss int64) {
    29  	if pcpu != tPcpu {
    30  		delta := int64(pcpu - tPcpu)
    31  		if delta < 0 {
    32  			delta = -delta
    33  		}
    34  		if delta > 30 { // 30%?
    35  			t.Fatalf("CPUs did not match close enough: %f vs %f", pcpu, tPcpu)
    36  		}
    37  	}
    38  	if rss != tRss {
    39  		delta := rss - tRss
    40  		if delta < 0 {
    41  			delta = -delta
    42  		}
    43  		if delta > 1024*1024 { // 1MB
    44  			t.Fatalf("RSSs did not match close enough: %d vs %d", rss, tRss)
    45  		}
    46  	}
    47  }
    48  
    49  func TestPSEmulationWin(t *testing.T) {
    50  	var pcpu, tPcpu float64
    51  	var rss, vss, tRss int64
    52  
    53  	runtime.GC()
    54  
    55  	if err := ProcUsage(&pcpu, &rss, &vss); err != nil {
    56  		t.Fatalf("Error:  %v", err)
    57  	}
    58  
    59  	runtime.GC()
    60  
    61  	imageName := getProcessImageName()
    62  	// query the counters using typeperf
    63  	out, err := exec.Command("typeperf.exe",
    64  		fmt.Sprintf("\\Process(%s)\\%% Processor Time", imageName),
    65  		fmt.Sprintf("\\Process(%s)\\Working Set - Private", imageName),
    66  		fmt.Sprintf("\\Process(%s)\\Virtual Bytes", imageName),
    67  		"-sc", "1").Output()
    68  	if err != nil {
    69  		t.Fatal("unable to run command", err)
    70  	}
    71  
    72  	// parse out results - refer to comments in procUsage for detail
    73  	results := strings.Split(string(out), "\r\n")
    74  	values := strings.Split(results[2], ",")
    75  
    76  	// parse pcpu
    77  	tPcpu, err = strconv.ParseFloat(strings.Trim(values[1], "\""), 64)
    78  	if err != nil {
    79  		t.Fatalf("Unable to parse percent cpu: %s", values[1])
    80  	}
    81  
    82  	// parse private bytes (rss)
    83  	fval, err := strconv.ParseFloat(strings.Trim(values[2], "\""), 64)
    84  	if err != nil {
    85  		t.Fatalf("Unable to parse private bytes: %s", values[2])
    86  	}
    87  	tRss = int64(fval)
    88  
    89  	checkValues(t, pcpu, tPcpu, rss, tRss)
    90  
    91  	runtime.GC()
    92  
    93  	// Again to test caching
    94  	if err = ProcUsage(&pcpu, &rss, &vss); err != nil {
    95  		t.Fatalf("Error:  %v", err)
    96  	}
    97  	checkValues(t, pcpu, tPcpu, rss, tRss)
    98  }