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Re: App w/excessive soft page faults
- From: Brian Ford <ford at vss dot fsi dot com>
- To: Elfyn McBratney <elfyn-cygwin at exposure dot org dot uk>
- Cc: cygwin <cygwin at cygwin dot com>
- Date: Wed, 30 Apr 2003 16:03:23 -0500 (CDT)
- Subject: Re: App w/excessive soft page faults
I tried setting a break point on RtlTimeFieldsToTime and
RtlTimeFieldsToTime+0x3dd. They never triggered.
Do breakpoints in dlls work?
On Wed, 30 Apr 2003, Elfyn McBratney wrote:
> > I have an app that is generating excessive soft page faults 500-700+/sec.
> > pfmon shows they happen here:
> >
> > SOFT: RtlTimeFieldsToTime+0x3dd : 0a7cb004
> > SOFT: stricmp+0x2f6 : 0a7da3ac
> >
> > This pattern repeats endlessly.
> >
> > We probably do make a lot of time related calls, but is this page faulting
> > behavior "normal"? Any idea of how to track this back through cygwin1.dll
> > and into my app? Thanks.
>
> First you need to compile your application with debugging symbols (the '-g'
> flag to gcc/c++). Once you've done that you can start your program under gdb
> like so
>
> $ gdb /path/to/app.exe
> (gdb) run [put any args here]
>
> and you can then issue the 'bt' command to gdb to get the backtrace, or if
> you suspect the problem is occurring inside the (Cygwin) DLL you can do
>
> (gdb) dll cygwin1
> (gdb) thread 1
> (gdb) bt
>
> this... I may have some of the above wrong (?).
>
> Elfyn
>
--
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
Phone: 314-551-8460
Fax: 314-551-8444
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