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Bash / cygwin process spawning (?) performance very slow
- From: litter at null dot net
- To: cygwin at cygwin dot com
- Date: Wed, 23 Sep 2015 10:52:26 +0200
- Subject: Bash / cygwin process spawning (?) performance very slow
- Authentication-results: sourceware.org; auth=none
I noticed that doing simple loops in Bash takes unexpectedly long under Cygwin on a Windows XP 32 bit machine
(CYGWIN_NT-5.1 <machine> 2.2.1(0.289/5/3) 2015-08-20 11:40 i686 Cygwin)
I already followed the FAQ advice in trying to determine general causes, and made a 'shadow' copy of /etc/passwd as described.
My PATH does not contain references to network shares.
Still quite normal commands take a long time e.g.
time cat some-file | while read i;do echo $i;/bin/true;done
for a file of 167 lines. Process Explorer showed a CPU load of 20% on bash.exe, which was almost completely Kernel time.
Is such high Kernel load normal?
I know it's a bit like comparing apples to oranges, but I run the SAME command from the same disk, from within a Debian 7 486 Linux on VirtualBox (!) on the same machine, it gave
So even running in emulator, real/user/sys time are about 30/60/30 times faster. That's quite shocking.
Is this performance to be expected? That would make it an obvious choice to switch to VirtualBox on this machine.
Problem reports: http://cygwin.com/problems.html
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