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Date: Thu, 07 Mar 2002 07:39:44 -0800
To: "Nicolae Santean" <nicolae_santean AT hotmail DOT com>, cygwin AT cygwin DOT com
From: Randall R Schulz <rrschulz AT cris DOT com>
Subject: Re^2: xdvi runtime error
In-Reply-To: <F97GtLdLnEF9S9IewJi00017094@hotmail.com>
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Nicolae,

At 07:15 2002-03-07, Nicolae Santean wrote:

>Thanks for your replay/advice . Let me share with you what I have
>found on my side:
>
>1. Apparently, the heap_chunk_in_mb registry does not always tweak
>the memory default limit for cygwin. Many people report this issue
>and it actually happened to me as well. But, here's what I tried:
>increased the value to 512Mb (instead of 256Mb - what I wanted)
>and I finally got my 256Mb (sharp) increase. I guess I have to
>set it to double what I want in order to get it (?).

Are you sure you've analyzed this problem correctly? If you want to 
realloc() an N-byte block to size M, there's a transient need for 
approximately N+M bytes (while the content from the old block is being 
copied to the new one). If the realloc() size increment is small, then the 
transient memory demand is approximately 2*N.


>2. I have fixed one of my xdvi problems: the error "setsid: Not owner"
>is due to the fact that xdvi calls vfork(), if not instructed to do
>otherwise. Apparently vfork() is not supported and I fixed the problem
>by redefining vfork as fork.
>
>3. Now, that I have increased the cygwin memory limit, xdvi goes to
>256Mb and dies there, so I guess I was right about this abnormal run.
>I will try to follow the indication about fcntl(F_SETOWN) - thanks
>for the advice.
>
>I found the same xdvi problem reported on the XFree86 mail list
>- with no follow-ups. So, I'll keep digging.
>
>Thanks again, and if you find more related clues, please let me know.
>
>Nic. Santean


Randall Schulz
Mountain View, CA USA


>>On Wed, Mar 06, 2002 at 10:32:38PM -0500, Nicolae Santean wrote:
>> >
>> > I believe that the 128 megabyte realloc failure is a consequence
>> > (memory leak - maybe) of the other errors:
>> >
>> > "xdvi: fcntl F_SETOWN: Invalid argument", "setsid: Not owner"
>> >
>> > I am getting these errors first, and then I watch the memory being
>> > slowly flooded. By no means xdvi should go to 128Mb. I suspect that
>> > I have used wrong config/makefile settings during the make/install
>> > and now xdvi is calling what it shouldn't.
>>
>>If xdvi is irritated by the result of fcntl(F_SETOWN) then you
>>should tweak xdvi to not use it.  F_SETOWN isn't supported by
>>Cygwin.  It always returns -1, errno = EINVAL.
>>
>>Corinna
>
>>Nicolae,
>
>>A 128 megabyte realloc fails? No kidding??
>
>>There is a Cygwin-wide allocation limit that defaults, if I recall 
>>correctly, to 128 megabytes. There is a registry entry that overrides
>this default called HEAP_CHUNK_IN_MB.
>
>>Here are the details, excerpted from an email by "Scott A. Hill" 
>><s DOT a DOT hill AT larc DOT nasa DOT gov> sent Tue, 3 Apr 2001 07:59:30 -0400:
>
>>-==- HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\
>
>>Create a new DWORD value there called "heap_chunk_in_mb" that 
>>contains >the maximum amount of memory (in Mb) your application needs 
>>(watch the
>>hex/decimal toggle). Exit and restart all cygwin applications.
>
>>The default is 128 (i.e. 128Mb) if no registry key is set. -==-
>
>>Good luck.
>
>>Randall Schulz Mountain View, CA USA
>
>>    Hello,
>
>>I have recently compiled xdvi22.53 under cygwin1.3.9, but I am having 
>>problems running it. The runtime error is:
>
>xdvi: fcntl F_SETOWN: Invalid argument
>- mktexpk --mfmode cx --bdpi 300 --mag 'magstep(0.5)'
>--dpi 329 cmsl10 '>&3'
>setsid: Not owner
>xdvi: fcntl F_SETOWN: Invalid argument
>xdvi: ! Out of memory (rellocating 134179459 bytes).
>
>>Any ideea abot what am I doing wrong? This may not be directly related
>>to cygwin, case in which I appologize for intrusion. Nevertheless, if
>>anybody has xdvi installed over cygwin and/or knows what's going on,
>>please replay to either this mailing list or directly to me at:
>
>>grail AT csd DOT uwo DOT ca.
>
>>Nick


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