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rusage.go
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rusage.go
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/*
rusage
By aadz, 2019
v. 1.0 - 2019-06-07
Initial version
v. 1.1 - 2019-06-10
rusage returns exit code it have got from a testing executalbe
v. 1.2 - 2019-06-10
display information about abnormal termination of a testing executalbe
v. 1.3 - 2019-06-11
some refactoring
v. 1.4 - 2019-07-03
statistics explanation added (from man 2 getrusage)
*/
package main
import (
"flag"
"fmt"
"os"
"syscall"
"time"
)
const STAT_EXPLANATION = `The fields are interpreted as follows:
Utime
This is the total amount of time spent executing in user mode, expressed
in a timeval structure (seconds plus microseconds).
Stime
This is the total amount of time spent executing in kernel mode,
expressed in a timeval structure (seconds plus microseconds).
Rtime
Real time of execution.
Maxrss (since Linux 2.6.32)
This is the maximum resident set size used (in kilobytes).
For RUSAGE_CHILDREN, this is the resident set size of the largest child,
not the maximum resident set size of the process tree.
Ixrss (unmaintained)
This field is currently unused on Linux.
Idrss (unmaintained)
This field is currently unused on Linux.
Isrss (unmaintained)
This field is currently unused on Linux.
Minflt
The number of page faults serviced without any I/O activity; here
I/O activity is avoided by “reclaiming” a page frame from the list of pages
awaiting reallocation.
Majflt
The number of page faults serviced that required I/O activity.
Nswap (unmaintained)
This field is currently unused on Linux.
Inblock (since Linux 2.6.22)
The number of times the filesystem had to perform input.
Oublock (since Linux 2.6.22)
The number of times the filesystem had to perform output.
Msgsnd (unmaintained)
This field is currently unused on Linux.
Msgrcv (unmaintained)
This field is currently unused on Linux.
Nsignals (unmaintained)
This field is currently unused on Linux.
Nvcsw (since Linux 2.6)
The number of times a context switch resulted due to a process voluntarily
giving up the processor before its time slice was completed (usually
to await availability of a resource).
Nivcsw (since Linux 2.6)
The number of times a context switch resulted due to a higher priority
process becoming runnable or because the current process exceeded its time
slice.`
func init() {
Hflag := flag.Bool("H", false, "Show explanation of ececution stat psrameters")
flag.Parse()
if *Hflag {
fmt.Println(STAT_EXPLANATION)
os.Exit(0)
}
}
// printRusage formats and prints a testing executable run stats.
func printRusage(procState *os.ProcessState, rtime time.Duration) {
sysRu := procState.SysUsage()
sysRusage := sysRu.(*syscall.Rusage)
fmt.Printf("\nUtime: %22.3f\n", procState.UserTime().Seconds())
fmt.Printf("Stime: %22.3f\n", procState.SystemTime().Seconds())
fmt.Printf("Rtime: %22.3f\n", rtime.Seconds())
fmt.Printf("Maxrss: %21d\n", sysRusage.Maxrss)
fmt.Printf("Ixrss: %22d\n", sysRusage.Ixrss)
fmt.Printf("Idrss: %22d\n", sysRusage.Idrss)
fmt.Printf("Isrss: %22d\n", sysRusage.Isrss)
fmt.Printf("Minflt: %21d\n", sysRusage.Minflt)
fmt.Printf("Majflt: %21d\n", sysRusage.Majflt)
fmt.Printf("Nswap: %22d\n", sysRusage.Nswap)
fmt.Printf("Inblock: %20d\n", sysRusage.Inblock)
fmt.Printf("Oublock: %20d\n", sysRusage.Oublock)
fmt.Printf("Msgsnd: %21d\n", sysRusage.Msgsnd)
fmt.Printf("Msgrcv: %21d\n", sysRusage.Msgrcv)
fmt.Printf("Nsignals: %19d\n", sysRusage.Nsignals)
fmt.Printf("Nvcsw: %22d\n", sysRusage.Nvcsw)
fmt.Printf("Nivcsw: %21d\n", sysRusage.Nivcsw)
}
func main() {
//fmt.Printf("CMD: %v\n", os.Args[1:])
// set inherited files
pAttr := new(os.ProcAttr)
pAttr.Files = []*os.File{os.Stdin, os.Stdout, os.Stderr}
// start the process and count run time
startTime := time.Now()
process, err := os.StartProcess(os.Args[1], os.Args[1:], pAttr)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
procState, err := process.Wait()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
endTime := time.Now()
// show the execution results and usage of system resources
printRusage(procState, endTime.Sub(startTime))
exitCode := procState.ExitCode()
if exitCode != 0 { // abnormal termination
waitStatus := procState.Sys().(syscall.WaitStatus)
termSignal := waitStatus.Signal()
fmt.Printf("\n")
if waitStatus.Signaled() {
infoLine := "Terminated by signal %d - %s"
if waitStatus.CoreDump() {
infoLine += " (core dumped)"
}
fmt.Printf(infoLine, termSignal, termSignal)
fmt.Printf("\nExitCode: %d\n", procState.Sys())
} else {
fmt.Printf("ExitCode: %d\n", exitCode)
}
}
os.Exit(exitCode)
}