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Message-ID:	<3B4F1341.B8AEE186@iee.org>
Date:	Fri, 13 Jul 2001 16:26:57 +0100
From:	Don Sharp <dwsharp AT iee DOT org>
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To:	gnuwin32 <Cygwin AT Sourceware DOT Cygnus DOT Com>
Subject:	Re: problem with heap, win32 error 487
References:	<3B4EE723 DOT 16CBA862 AT agere DOT com>

Thorsten Clevorn wrote:
> 
> Hi,
> 
> I am trying to run a simulation in C on my Win2K-machine (the simulation
> 
> runs perfectly on a Linux-PC)
> The problem seems to be with the memory rquirements.
> With certain parameters, I get some huge
> 3-dimensional arrays that require like 20-40MB RAM.
> When I have a size of about 22MB the simulation works fine, when I
> increase the array size by a factor of ~1.33 (should then still be below
> 
> but close to 32MB) it doesn't start with the error message
> C:\cygwin\home\clevorn\wlan15\Main.exe: *** Couldn't reserve space for
> cygwin's heap (0x20030000) in child, cygheap, Win32 error 487
> 
> I tried two solutions posted in the mailing list for similiar problems:
> 
> first:
> the "gcc -Wl,--heap,50000000,--stack,--50000000 ..." solution
> here the simulation fails at small array sizes too.
> 
> second:
> the "gcc -mno-cygwin ..." solution
> here the program does start, but the only thing that happens is, if you
> look in the task manager, the process slowly "collects" memory for about
> 
> 90 seconds until it recaches 32MB (33xxxkB) and than the process crashes
> 
> with the windows message " the exception unknown software exception
> (0xc00000fd) occured in the application at location 0x6104b9ef". 

As -mno-cygwin uses native M$ libraries it seems likely that the problem
is not of cygwin's making.
Does it work when compiled with MSVC ?

Cheers

Don Sharp


> During that time the VM Size increases with the same rate, only it start at
> values like 4xxMB or 6xxMB, depending on the array size (I have 1 GB RAM
> 
> so the pure size of these value isn't the real problem).
> 
> I think that the size of slightly below or even above 32MB is the cause
> of the problem. Is there a general problem with cygwin and running
> programs that require this amount of memory. Is there a way around this
> problem.
> 
> Thanks for your help!
> 
> Regards,
> 
> Thorsten
> 
> $ cygcheck -s -v -r
> 
...snip...

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