[Users] running Cactus on bigben

[Erik Schnetter]

On May 15, 2007, at 14:15:40, Maria Cristina Babiuc wrote:

> Hello,
>
> Erik, thank you for your input.
> The arrangement runs fine on my desktop computer, so I'm surprised  
> it could
> run out of memory on a supercomputer. I'm using 4 processors, on  
> two nodes,
> and each compute node has 2 Gbytes of memory.

Some modern workstations have more memory than you have per processor  
on a supercomputer.

> I tried the option PUGH::storage_verbose = yes, but I need some  
> help in how to
> interpret the output. I am getting a very long list in which the  
> message is:
> INFO (PUGH): Switched memory off for variable 'variable_name'  [GV  
> TLs: -11782
> Total Size: 430.99 MB]

This message means (a) there is an error in PUGH, because it thinks  
that the number of active time levels in negative, and (b) that this  
particular processor (probably processor 0) has 430 MB allocated,  
which would fit onto the node.  I assume that the number 430.99 is  
the last number that appears before the segmentation fault?

I just see the following lines in your output:

> Stack Trace:  ------------------------------
> #0  0x0000000001604e9e in cctk_reduce_()
> #1  0x3fb1bea7f2e4e25e in cctk_reduce_()

Can you should rebuild your application without optimisation and with  
debug information included?  This would give you more information  
from the stack backtrace you sent.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

My email is as private as my paper mail.  I therefore support encrypting
and signing email messages.  Get my PGP key from www.keyserver.net.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: reduce1.c
Type: application/octet-stream
Size: 1553 bytes
Desc: not available
Url : http://www.cactuscode.org/pipermail/users/attachments/20070515/446e62c4/attachment-0001.obj 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: PGP.sig
Type: application/pgp-signature
Size: 186 bytes
Desc: This is a digitally signed message part
Url : http://www.cactuscode.org/pipermail/users/attachments/20070515/446e62c4/attachment-0001.bin