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Date:	Mon, 26 Oct 2009 14:29:00 -0400
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Subject:	Re: How to increase the memory available to diff in cygwin 1.7?
From:	Kenneth Chiu <kchiu AT cs DOT binghamton DOT edu>
To:	cygwin AT cygwin DOT com
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Hm...I thought that discussion was actually about grep, but,
nonetheless, it does seem increasingly likely that this
is just a problem with diff.

Considering that I only want to know whether or not two files
differ, this should not require any significant memory usage.
(In other words, don't use mmap().)

I guess I'll just write my own recursive comparison program.
In theory I can just write it as if the platform were POSIX, right?
That'd be sweet, and make it a million times easier for me.

On Mon, Oct 26, 2009 at 1:26 PM, Christopher Faylor
<cgf-use-the-mailinglist-please AT cygwin DOT com> wrote:
> On Mon, Oct 26, 2009 at 11:41:13AM -0400, Kenneth Chiu wrote:
>>I'm trying to diff two large directories, recursively, and
>>I'm getting this error:
>>
>> =A0 =A0$ diff -rq B B2 >diff.out
>> =A0 =A0diff: memory exhausted
>>
>>I looked at this URL
>>
>> =A0 =A0http://cygwin.com/cygwin-ug-net/setup-maxmem.html
>>
>>but it seemed out-of-date. =A0There was no such key in the
>>registry, and the options to the regtool were different from
>>what the regtool man page says.
>>
>>Any suggestions on how to get rid of the memory
>>exhaustion error? =A0Is there a new key path that I should
>>use for the heap_chunk_in_mb value? =A0Is it possible
>>that I'm simply bumping into a 2 GB limit for
>>32-bit processes? =A0(And if that is the case,
>>is there a recommended way to go to 64-bit?)
>
> AFAIK, this is just a limitation of diff. =A0You can get the same
> error on linux.
>
> This was discussed in some detail in this list a few months ago.
>
> cgf
>
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