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Re: Simple bash script is slow to execute - appears to be time spent starting commands like ls
On 9/2/09, David Tazartes wrote:
> Bryan Thrall wrote:
> You're right about true being built-in, but we still don't know from
> your examples whether the problem is from forking or from IO. Try
> replacing 'true' in Jeremy's loop with '/bin/true'. Comparison between
> the two should give us an idea of the forking cost, without IO getting
> in the way.
> I had to reduce to 100 iterations.
> On Linux:
> real 0m0.448s
> user 0m0.244s
> sys 0m0.220s
> On Cygwin:
> real 0m48.411s
> user 0m15.005s
> sys 0m18.520s
> So basically a factor of 100... again points to forking or Vista process
> start slowness.
I couldn't resist playing along at home on a Windows XP machine :)
It doesn't seem to be just a Windows Vista problem:
$ time for n in $(seq 1 10000); do /bin/true; done
$ time for n in $(seq 1 10000); do true; done
$ uname -a
CYGWIN_NT-5.1 33LTLG 1.5.25(0.156/4/2) 2008-06-12 19:34 i686 Cygwin
Problem reports: http://cygwin.com/problems.html
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