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[FAQ alert] RE: segfault on memory intensive programs


On 30 March 2006 14:51, Pete wrote:


> It reports back 1536 MB.   Very strange!  The registry
> setting appears to not be having an effect.

  1.5 Gig is about the most it's possible to get under 'doze.  The address
space of the processor is 4gig, the upper 2 gig (addr >= 0x80000000) belong to
the kernel, the lower 2 gig belong to user-land.  Take away 512k at the top of
that for the space where the dll's load (0x600000000 - 0x7fffffff), and what
you're left with is what you get.

  As to the FAQ entry, it really needs a little alteration.  Ping JDF!

  It should make clear that those parameters are in bytes.  The example of a
4k stack and 1k heap is a bit unrealistic and it might be more productive to
show people how to make exes with /big/ stacks, since that's the problem
people usually run into.  How about something a bit more like

-------------------------------------------------------------<snip>
21. 	

How can I adjust the heap/stack size of an application?
	
If you need to change the maximum amount of memory available to Cygwin, see
http://cygwin.com/cygwin-ug-net/setup-maxmem.html. Otherwise, just pass the
desired heap/stack size in bytes as linker arguments to gcc. To create foo.exe
with a heap size of 200MB and a stack size of 8MB, you would invoke gcc as:

gcc -Wl,--heap,200000000,--stack,8000000 -o foo foo.c 
-------------------------------------------------------------<snip>

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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