MultiCPU 495

Tommy Willoughby If in doubt, and it is running on a *86 machine, run memtest86 overnight (or longer, depending on how much RAM you have and how fast your processor(s) is) and test the ram to be sure.

As someone else has said, if this application is the only one exhibiting this problem, it is more likely to be a software problem in the application than a hardware problem.

I have run RHEL 3 on this machine ever since it came out and never had any troubles with it. It is currently running 2.4.21-37.0.1.ELhugemem kernel which is one of the current ones. I have two hyperthreaded Xeon processors, so it looks like 4. I do not know if any single application is mulbreasthreaded, but some programming systems are; e.g., IBM DB2, that runs multiple processes. For example, DB2 is doing nothing at all right now and it is running the following daemons:

$ ps -fu db2inst1 UID PID PPID C STIME TTY TIME CMD db2inst1 5813 5812 0 Feb21 ? 00:00:03 db2sysc db2inst1 5818 5813 0 Feb21 ? 00:00:00 db2ipccm db2inst1 5819 5813 0 Feb21 ? 00:00:00 db2tcpcm db2inst1 5820 5813 0 Feb21 ? 00:00:00 db2tcpcm db2inst1 5821 5813 0 Feb21 ? 00:00:00 db2resync db2inst1 5822 5817 0 Feb21 ? 00:00:00 db2srvlst db2inst1 5824 5813 0 Feb21 ? 00:01:53 db2hmon ,0,0,0,1,0,1,1,1e014,2,0 db2inst1 11317 5818 2 Feb21 ? 00:44:04 db2agent (idle) db2inst1 24163 5817 0 Feb22 ? 00:00:09 db2agent (idle) db2inst1 24164 5817 0 Feb22 ? 00:00:08 db2agent (idle) db2inst1 24165 5817 0 Feb22 ? 00:00:08 db2agent (idle) db2inst1 24166 5817 0 Feb22 ? 00:00:07 db2agent (idle) $ ps -fu root grep db2 root 5812 1 0 Feb21 ? 00:00:00 db2wdog root 5814 5813 0 Feb21 ? 00:00:00 db2ckpwd root 5815 5813 0 Feb21 ? 00:00:00 db2ckpwd root 5816 5813 0 Feb21 ? 00:00:00 db2ckpwd root 5817 5813 0 Feb21 ? 00:00:01 db2gds root 5898 1 0 Feb21 ? 00:00:16opt-IBM-db2-V8.1-bin-db2fmcd

Now when it is actually doing something, some of these processes fork off a bunch more, and they all cooperate to get the job done. Some of these may be internally mulbreasthreaded, but I do not know this for sure.

I have another machine with two processors (Pentium IIIs, not hyperthreaded) running a RHEL 4 clone (CentOS 4.2) and it runs just fine, but it does not do much (running a bunch of BOINC projects mostly), so no conclusion can be drawn there. It does run to BOINC applications at a time successfully.

-- .~. Jean-David Beyer Registered Linux User 85642. V PGP-Key: 9A2FC99A Registered Machine 241939. ^^-^^ 07:50:01 up 1 day, 10:09, 3 users, load average: 4.62, 4.36, 4.18