i am experiencing memory problems trying to run an application that processes a file of about .5GB. So far my results are: (1) set ulimit as follows: core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) 256000 max memory size (kbytes, -m) 256000 open files (-n) 1024 pipe size (512 bytes, -p) 8 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) 768000 This gives me 'out of memory' errors. (2) set 'virtual memory' very high and the application hogs memory and brings the rest of the system to almost a halt. Thanks in advance for any help you can give me, Tom Arnall north spit, ca - : send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html