69

So, Unix has a time command that lets users time their code/other things. I was wondering if the Windows command line has anything similar.

Also, I asked a previous question regarding the Linux command line here. Can we do the same for Windows? If so, how?

  • 2
    Windows has the standard cmd.exe but if you want something closer to the linux version get the powershell, its way better. – Guillermo Siliceo Trueba Jan 1 '11 at 22:53
  • I searched for "command time for windows" on google on the first result gives: http://stackoverflow.com/questions/673523/how-to-measure-execution-time-of-command-in-windows-command-line – David Michel Jan 1 '11 at 22:55
  • I'm on Windows 7 and I just tried the solution posted above. I get the following error: Unable to query system performance data (c0000004). I googled it and someone else had the exact same problem, but the forum suggests no solution. Thanks for the suggestion anyway. Can someone suggest something for the other part? – efficiencyIsBliss Jan 1 '11 at 23:10
  • @eff, timeit.exe is for server 2003 and XP AFAIK, I don't think its compatible with 7. – John T Jan 1 '11 at 23:39

10 Answers 10

57

Use Powershell

Measure-Command {start-process whateveryouwantexecute -Wait}

Edited to your need @efficiencylsBliss:

Measure-Command {start-process java -argumentlist "whateverargumentisneeded" -wait}
  • Here's what I tried: Measure-Command {java test <inputfile> -Wait}. I got a list of time-related statistics, but not the output from the code. Am I doing something wrong? – efficiencyIsBliss Jan 2 '11 at 0:50
  • @efficiency: You forgot the start-process command. – Sasha Chedygov Jan 2 '11 at 1:40
  • Start-Process : A positional parameter cannot be found that accepts argument '.\6-8.txt'. At line:1 char:31 + Measure-Command {start-process <<<< java .\dancebattle .\6-8.txt -wait} + CategoryInfo : InvalidArgument: (:) [Start-Process], ParameterBindingException + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.StartProcessCommand` – efficiencyIsBliss Jan 2 '11 at 15:01
  • 1
    I'm trying to measure the time it takes to run a Python script using Measure-Command {start-process \Python27\python test.py -Wait}. This opens up a new cmd window to run the process, but then closes the window when it's done running. I'd like to see the output of the script as well, so how can I keep the window open? – John Peter Thompson Garcés Apr 10 '13 at 15:34
  • 2
    @JohnPeterThompsonGarcés use the -NoNewWindow parameter of the start-process cmdlet – mjsr Apr 10 '13 at 16:29
21

I'm using Win XP, for some reason, timeit.exe is not working for me. I found another alternative: ptime:

ptime 1.0 - Accurately measure program execution time

ptime will run any specified command and parameters, and measure the execution time (run time) in seconds, accurate to 5 millisecond or better. It is an automatic process timer, or program timer used for benchmark purposes.

  • ptime have one small bug. ptime always return 0 as error level, even if "child" program exit with error – Yura Shinkarev Sep 16 '15 at 8:23
  • Super simple and accurate output. – janpio Aug 20 '18 at 8:50
  • Seems to work fine in Win10. – mivk Sep 16 '18 at 12:30
17

You can cheat a little with a batch script...

@echo off
echo %time% < nul
cmd /c %1
echo %time% < nul

Then run your program as an argument to this script...

timer myprogram.exe

and for arguments...

timer "myprogram.exe -sw1 -sw2"

example output:

17:59:20.02
some text
17:59:20.03

place the batch script somewhere in your PATH variable, e.g. C:\Windows\System32 and name it timer.cmd. Of course there is a small performance hit of forking a second cmd instance, although very minimal.

  • that prompt wouldn't work, @echo off echo %time% < nul cmd /c %1 echo %time% < nul you left out the closing % on the environment variable(?) – user61885 Jan 7 '11 at 18:07
  • There is no closing % for command line parameters like %1. Is that what you meant? – Andrew J. Brehm Apr 30 '11 at 11:42
  • 2
    Why would you redirect nul into echo? echo doesn't ever read input. – Joey Jan 4 '14 at 11:28
  • 1
    You can change cmd /c %1 to cmd /c %*, so that you can save quotation mark for command arguments – stanleyxu2005 Dec 3 '17 at 9:23
3

There is no direct equivalent to Unix time on Windows.

The University of Georgia have a brief list of Windows commands for Unix users

I find the older Windows command prompt and .bat scripting is rather limited compared to Unix shells but there are some facilities for looping over files etc. CommandWindows.com has some tips

You could either install bash on Windows (e.g. by installing CygWin) or learn Windows Powershell (which I am assuming has a means of doing something equivalent).

2

The output for your code can be piped to a file: java test <inputfile> | Out-File d:\a.txt

For measuring how long it takes you have to encapsulate it in Measure-Commmand:

Measure-Commmand {java test <inputfile> | Out-File d:\a.txt}

2

If you try to use PowerShell with Measure-Command be aware that there may be some unexpected gotchas. My command writes binary data to a file using > redirection but PowerShell added a BOM to the beginning of the file and a CRLF line break after every write!

1

Some coffee helped me come up with this:

function time { $Command = "$args"; Measure-Command { Invoke-Expression $Command 2>&1 | out-default} }

And if you want it to output nothing, just replace with out-null:

function timequiet { $Command = "$args"; Measure-Command { Invoke-Expression $Command 2>&1 | out-null} }

You use it like this:

PS C:\> time sleep 5


Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 4
Milliseconds      : 990
Ticks             : 49906722
TotalDays         : 5,77624097222222E-05
TotalHours        : 0,00138629783333333
TotalMinutes      : 0,08317787
TotalSeconds      : 4,9906722
TotalMilliseconds : 4990,6722



PS C:\>
1

For ease of use, here is the chocolatey package: https://chocolatey.org/packages/ptime C:/> choco install ptime

The advantage if ptime is that it acts like the unix version and yields the console output, which Measure-Command { XXX } does not (or at least I don't know how to do that).

0

There are a couple different options to get a 'time' command. My preference is to just install Cygwin (which comes with a UNIX-like time command).

Alternatively, you can write a script and add it to your path (so that you can execute it without specifying the entire path).

If you have Powershell available, try this script (works when calling files--'.exe',etc.):

$start = get-date
if ($args.length -gt 1) {
start-process $args[0] $args[1..$args.length] -workingdirectory $pwd -nonewwindow -wait
} else {
start-process $args[0] -workingdirectory $pwd -nonewwindow -wait
}
$end = get-date
$elapsed = $end - $start
write-host $end-$start
# datetime format
write-host $elapsed
# easy-to-read format
echo $elapsed

Run the code with (for instance):

time.ps1 python program.py

Using Batch, I'd suggest either of the top answers from here (on Stackoverflow.com). Both just need to be copy-pasted. Note that if you use paxdiablo's solution, you should replace

ping -n 11 127.0.0.1 >nul: 2>nul: 

with

%*
0

gnomon is a nice solution if you don't only need the total run time of a command, but also line for line measurements:

A command line utility to prepend timestamp information to the standard output of another command. Useful for long-running processes where you'd like a historical record of what's taking so long.

Installed by running npm install -g gnomon, then just use it via command | gnomon.

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