Re: cygwin randomly pauses under Win2k

["Chris January" <chris at atomice dot net>]

> I have this wierd behaviour, and it is causing some stats that I
> run to whack out.....
>
> Every now and again (every 15-30 minutes or so), my cygwin apps
> pause for 1-2 MINUTES....   I have written a simple script to capture
> this behaviour:

> What's interesting is that between seconds 42 & 45,
> time shows an elapsed time of 1:00.21, but the system clock has
> actually elapsed 2 minutes & 50 seconds, (unless there is some
> major hangups in the invoking of the echo and/or `date` commands).
>
> I am working on this machine, so I know that there are no 2-3 minute
> pauses in user responsiveness....
>
> Has anyone else experienced this kind of behaviour??

Yes, I've seen this behaviour. It's something to do with file I/O IIRC. 100%
reproducible in a small program I have. Here's an strace demonstrating the
problem:

   97 7911229 [main] base 2872 fhandler_base::open:
(C:\cygwin\opt\kde2\lib\cygkatecore.dll, 0x110000)
*** big long pause ***
11237820 19149049 [main] base 2872 fhandler_base::open: 0x19C = CreateFileA
(C:\cygwin\opt\kde2\lib\cygkatecore.dll, 0x8
0000000, 0x7, 0x22F764, 0x3, 0x2000080, 0)
 1287 19150336 [main] base 2872 fhandler_base::open: filemode set to binary
  192 19150528 [main] base 2872 fhandler_base::open: 1 = fhandler_base::open
(C:\cygwin\opt\kde2\lib\cygkatecore.dll, 0x
110000)
   89 19150617 [main] base 2872 fhandler_disk_file::open: 1 =
fhandler_disk_file::open (C:\cygwin\opt\kde2\lib\cygkateco
re.dll, 0x110000)
  136 19150753 [main] base 2872 fhandler_disk_file::fstat_helper: 1 =
GetFileInformationByHandle (C:\cygwin\opt\kde2\lib
\cygkatecore.dll, 412)
  424 19151177 [main] base 2872 get_nt_attribute: file:
C:\cygwin\opt\kde2\lib\cygkatecore.dll
  208 19151385 [main] base 2872 read_sd: file =
C:\cygwin\opt\kde2\lib\cygkatecore.dll
 1385 19152770 [main] base 2872 read_sd: file =
C:\cygwin\opt\kde2\lib\cygkatecore.dll: len=128

Regards
Chris



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