memory allocation problem

Jacek Klos jakl at
Thu Jun 21 02:19:25 BST 2001

Dear Molpro-Users

I appologize for bothering, but I solved already my problem.
Under Tru64 unix there is a hard limit on datasize equal to 1GB almost.
One needs to set up new values for kernel parameters which set hard limits
for datasize and stacksize (limit command reports current values).
After running dxkerneltuner on DEC alpha one has to change
max_per_proc_data_size to bigger hard limit and per_proc_data_size to
maximal value allowed without unlimit command under csh.
Both parameters are in proc option of dxkerneltuner menu.
Now after applying changes and rebooting system got new values and
larger request of RAM was possible.
I hope this message will help DEC fans.

Messing with kernel options is a great risk.
I am NOT responsible of any data nor system damage resulted by reading
this help  and in doubts I advise to contact Tru64 Compaq Support.
Plese, be sure you know what you are doing while changing kernel

Best regards
Jacek Klos

 On Wed, 20 Jun
2001, Jacek Klos wrote:

> Dear Molpro Users,
> I have problem to run molpro jobs in wich I want to allocate more than 1GB
> of memory. The platform is Compaq DS20E with 4GB of memory (2GB per CPU).
> The maximal amount of memory I can allocate is
> memory, 116,m;
> which is around 1GB of memory.
> When I am attempting to put more than 116 mwords the job exits with a
> error message: gmainv1 failure to allocate 130158002
> and in the output I get:
> Failure in attempting memory allocation of 130158002 words (993 Mbyte)
> This error has been generated by the operating system,
> and may be the result of insufficient system memory or paging space
> In order to avoid the problem in the MOLPRO context,
> consider also reducing the requested memory through
> the MEMORY input command, or the -m command line option
> gmainv1 failure to allocate 130158002
> Do you know how this problem can be overcome?
> Thank you in advance for reply,
> Jacek

Jacek A. Klos
>From 5/2001 till 8/2001:
Department of Chemistry
Oakland University
Rochester Hills
Michigan 48309

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