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Message-ID: <4D7A40F4.2020507@emrich-ebersheim.de>
Date: Fri, 11 Mar 2011 16:34:12 +0100
From: Rainer Emrich <rainer AT emrich-ebersheim DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: ld: fatal error - cmalloc would have returned NULL
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Corinna,

Am 11.03.2011 16:07, schrieb Corinna Vinschen:
> Rainer,
> 
> On Mar 11 15:23, Corinna Vinschen wrote:
>> On Mar 11 15:13, Corinna Vinschen wrote:
>>> On Mar 11 14:53, Rainer Emrich wrote:
>>>> I have to be more clear. I increased the heap_chunk_in_mb to 1792 using:
>>>> regtool -i set /HKLM/Software/Cygwin/heap_chunk_in_mb 1792
>>>
>>> But that's the size of the application heap, not the size of the
>>> cygheap.  The cygheap is used by a couple of internal datastructures
>>> of the cygwin DLL itself, while the application heap is used for malloc.
>>>
>>> So you raised the size of the application heap, probably not to 1792
>>> Megs, but the next lower allocation possible (cygwin decrements the size
>>> in 1MB steps until the allocation succeeds.
>>>
>>> That's weird.  malloc uses mmap, but only for allocations beyond 128K.
>>
>> Actually mmap is only used if you try to malloc >= 256K.
>>
>>> Since ld only allocates 64K chunks, it doesn't look like mmap is called
>>> from malloc.  OTOH, if raising the heap size helps, how do the
>>> zillions of mmap calls into this picture?!?
> 
> I was wondering if I could reduce the pressure on the cygheap by using a
> simplified method to allocate the required bookkeeping datastructures.
> It passes my homebrew mmap testsuite, but I would be curious if this
> might fix your problem.  I have not very much hope, but anyway...
> 
> Would you mind if I send you a link to a cygwin DLL for testing by
> private email?
Yes, of course. You're welcome to send me a link. I' m able to test next week.

> 
> 
> Thanks,
> Corinna
> 

Thanks,
Rainer
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