Dear all, Previously I am able to run a script on our server but now it gave me a Segmentation fault (core dumped) error. try I tried the script with same type of netcdf file but with much smaller file size and it works. So I think the error is related with memory stuff. I guess it's because our system administrator make some change somewhere and that cause my problem? the file size that cause the error to appear is 2.6G (in the script I read this file with NetCDF4 to numpy array and make some manipulation), the small one without error is only 48M. I tried to use "limit" command to list the following, then I change stacksize to unlimited and the problem still occurs. ychao@obelix2 - ...CRU_NEW - 12 >limit cputime unlimited filesize unlimited datasize unlimited stacksize 10240 kbytes coredumpsize 0 kbytes memoryuse unlimited vmemoryuse unlimited descriptors 1024 memorylocked 64 kbytes maxproc 1024 would anybody be able to give me a short explanation or direct me to some webpage which can help to understand the problem? thanks et cheers, Chao -- *********************************************************************************** Chao YUE Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) UMR 1572 CEA-CNRS-UVSQ Batiment 712 - Pe 119 91191 GIF Sur YVETTE Cedex Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16 ************************************************************************************