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Date:	Wed, 20 Jul 2011 08:00:16 -0500
From:	Luiz Claudio Valdetaro <luizclaudio AT valdetaro DOT com>
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Subject:	Re: [bash or DLL] Memory leak in childs
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Classic.... this is windows for you. And they want me to get a phone 
based in Windows? Or a Ford Fusion, based on Windows? LOL

On 7/19/2011 8:40 PM, Mark Geisert wrote:
> Heiko Elger writes:
>> I just used another small testcase doing the same.
> [...]
>> $ cat test2.sh
>> #!/bin/sh
>> trap "echo TRAP; exit -1" SIGHUP SIGINT SIGQUIT SIGILL SIGTRAP SIGABRT
>> SIGEMT SIGFPE SIGKILL SIGBUS SIGSEGV SIGSYS SIGPIPE SIGALRM SIGTERM
>> SIGURG SIGSTOP SIGTSTP
>> SIGCONT SIGCHLD SIGTTIN SIGTTOU SIGIO SIGXCPU SIGXFSZ SIGVTALRM SIGPROF
>> SIGWINCH SIGPWR SIGUSR1 SIGUSR2 SIGRTMAX
>>
>> while ./exiter-vs2003.exe ; do
>>      echo -n $?
>> done
>> echo RC=$?
>> ****** snip snip snip ******
>>
>> exiter-vs2003.c.c ist compiled with MS Visual Studio 2003
>> ****** snip snip snip ******
>> $ cat exiter-vs2003.c
>> #include<stdio.h>
>>
>> int main(int argc, char** argv[])
> (I won't point out the error in the above line.)
>
>> {
>>      printf(".");
>>      return 0;
>> }
> Thanks very much for the specific info.  I happened to have VS 2003 around
> so I was able to build the toy program.
>
> The bad news is that I did reproduce what you're seeing on my quad-core 2.6Ghz
> system.  Over a 15 minute span peak memory use went from 227MB to 392MB.  After
> that point the system seemed to go kind of haywire: window title bars were no
> longer being refreshed but rather overwritten, no further output in the window
> running the 10 copies of test2.sh, Task Manager having trouble refreshing its
> displays.  I rebooted the system because I no longer trusted its operation.
>
> The good news is that I was then able to reproduce the issue without Cygwin.
> I coded up a "test2.bat" as follows:
> @echo off
> :again
> exiter-vs2003
> echo %errorlevel%
> if %errorlevel%==0 goto again
>
> ..and a "driver.bat" to launch 10 copies of test2.bat as follows:
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
> start /b test2.bat
>
> I did all that in a Command Prompt window so that Cygwin was not involved in
> any way.  Then I started up driver.bat.
>
> After 15 minutes, peak memory usage had gone from 227MB to 334MB and the
> system went haywire in the same fashion as before.  I rebooted again.
>
> The moral of this story seems to be: Running an executable many thousands of
> times with multiple copies running at once eventually uses up some critical
> Windows internal resource(s) and causes the system to malfunction.  It doesn't
> matter whether the executable is run from a Cygwin environment or a native
> Windows environment.
> HTH,
>
> ..mark
>
>
>
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