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From: Helmut Karlowski <helmut DOT karlowski AT ish DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: Bash / cygwin process spawning (?) performance very slow
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Date: Wed, 23 Sep 2015 18:55:28 +0200
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---------------------------------------------------
> I'm not running any antivirus as far as I'm aware of (I do run a Comodo firewall with all "virus" scanning disabled).
> I checked again, and it really is the Bash.exe which is consuming a lot of Kernel time. I didn't spot another process kicking in and consuming cycles.

You can do the same in dash (sans time) for example to rule out  bash.

> Any idea how to diagnose the cause of this? Is there any Cygwin specific logging/tracing to see where it is happening?

Maybe:

strace bash -c 'time cat some-file | while read i;do echo 
$i;/bin/true;done'

Haven't tested it.

Simplify the command:

for((i=0;i<150;i++));do /bin/true;done

to rule out a pipe-problem.

-Helmut


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