Hi,
We are experiencing performance degradation between Cygwin version
1.7.7-1 and 1.5.24-2.
Recently, we have upgraded from Cygwin version 1.5.24-2 to version
1.7.7-1. The simple test brings forward the performance degradation in
version 1.7.7-1 over 1.5.24-2.
<On Cygwin version 1.5.24-2>
bash-3.2$ while [ 1 ]; do date; done | uniq -c
40 Mon Feb 6 17:58:13 2012
65 Mon Feb 6 17:58:14 2012
66 Mon Feb 6 17:58:15 2012
65 Mon Feb 6 17:58:16 2012
66 Mon Feb 6 17:58:17 2012
65 Mon Feb 6 17:58:18 2012
66 Mon Feb 6 17:58:19 2012
65 Mon Feb 6 17:58:20 2012
65 Mon Feb 6 17:58:21 2012
66 Mon Feb 6 17:58:22 2012
65 Mon Feb 6 17:58:23 2012
66 Mon Feb 6 17:58:24 2012
64 Mon Feb 6 17:58:25 2012
65 Mon Feb 6 17:58:26 2012
66 Mon Feb 6 17:58:27 2012
66 Mon Feb 6 17:58:28 2012
65 Mon Feb 6 17:58:29 2012
65 Mon Feb 6 17:58:30 2012
bash-3.2$
<On Cygwin version 1.7.7-1>
# while [ 1 ]; do date; done | uniq -c
16 Mon Feb 6 17:58:41 IST 2012
49 Mon Feb 6 17:58:42 IST 2012
50 Mon Feb 6 17:58:43 IST 2012
50 Mon Feb 6 17:58:44 IST 2012
49 Mon Feb 6 17:58:45 IST 2012
50 Mon Feb 6 17:58:46 IST 2012
50 Mon Feb 6 17:58:47 IST 2012
49 Mon Feb 6 17:58:48 IST 2012
49 Mon Feb 6 17:58:49 IST 2012
49 Mon Feb 6 17:58:50 IST 2012
50 Mon Feb 6 17:58:51 IST 2012
50 Mon Feb 6 17:58:52 IST 2012
49 Mon Feb 6 17:58:53 IST 2012
50 Mon Feb 6 17:58:54 IST 2012
50 Mon Feb 6 17:58:55 IST 2012
49 Mon Feb 6 17:58:56 IST 2012
50 Mon Feb 6 17:58:57 IST 2012
50 Mon Feb 6 17:58:58 IST 2012
49 Mon Feb 6 17:58:59 IST 2012
51 Mon Feb 6 17:59:00 IST 2012
49 Mon Feb 6 17:59:01 IST 2012
51 Mon Feb 6 17:59:02 IST 2012
#
As you can see the version 1.5.24-2 executes date command
approximately 15-16 times more than in version 1.7.7-1.
The above test is done on MS Windows XP Professional version 2002 SP3, v.5857.
i7-2620M CPU @ 2.70GHz, 3.16 GB of RAM. Care has been taken to perform
the above 2 tests one at a time under the same load average on the
machine.
Is this performance degradation a known issue and does anyone knows if
this is already addressed in any Cygwin version higher than 1.7.7-1?
Thanks,
Jaswinder
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