I have an executable provided to me that makes IPC system call
(msgget) to create a IPC message segment ( in 0666 mode ). I run it
on 3 x two-node Linux Red Hat AS 2.1 clusters. On just 1 of the
clusters, the job uses significantly more CPU time and takes longer to
complete. In particular, it uses lots of System time (30-40%),
whereas on the other 2 clusters, the same executable file uses hardly
any System time - mostly User time. This can be seen by using the
The system configurations are identical in the following respects:
Kernel revision: 2.4.9-e.10.7enterprise #1 SMP
Kernel parameters: /etc/sysctl.conf
RPM package installs: rpm -qa
Hardware: Dell 2650 2 CPUs per node, with 6Gb RAM.
The message queue is created:
------ Message Queues --------
key msqid owner perms used-bytes messages
0x00000003 98304 oracle 666 252 3
and the program runs , but on the troubled cluster, it is mostly in
000 S oracle 20986 1 8 80 5 - 355 msgrcv 01:36 pts/2
Any ideas? This is driving me nuts!
I am fairly new to Unix so any pointers in the right direction would
be much appreciated!