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Date:	Mon, 10 May 2010 05:54:04 -0700 (PDT)
From:	kulalking <sathish DOT kulal AT gmail DOT com>
To:	cygwin AT cygwin DOT com
Subject:	changing the VM size in cygwin.
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Hi All,=20

We are running a server on cygwin (on windows 7 , 64 bit , 6 GB RAM ), it
used to run fine with Linux environment.=20

It is crashing on cygwin when client access the huge memory. We found on
debugging that huge memory allocation causing the crash: _buf =3D new
char[array_wid]  where  array_wid is 1GB. So it is finding difficult to get
huge continues memory in cygwin.

We tried changing the heap memory using regtool command,
regtool -i set /HKLM/Software/Cygwin/heap_chunk_in_mb 4096
regtool -i set /HKCU/Software/Cygwin/heap_chunk_in_mb 4096

we got above information from :=20
http://www.cygwin.com/cygwin-ug-net/setup-maxmem.html
http://www.cygwin.com/cygwin-ug-net/setup-maxmem.html=20
After that we tried to get the memory allocation limit, code is given in the
same link.=20
We are getting only 1596 MB.

Windows machine having more VM size, around 6GB we can see that in process
explorer, but cygwin is not transferring that to environment.=20

looking for the help for increase the VM, or any solution/suggestion ?

And also we also tried Rebuilding the our application with high stack size,
-Wl,--stack,8388608 , didn=E2=80=99t give any hope :(

We also tried with ulimit =E2=80=93v  option , and we are not able to chang=
e the vm
size , it says 2 GB is the MAX!


--=20
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