smon 4030 - quick ideas? 2006-06-03 - By Kevin Closson
Sorry, left that out. Linux, RH I believe. Kernel is
2.4...ELsmp.
^^^^^^^^^^^^
arrgh. Well, since I have not seen a 4030 in 10g (since it
uses
mmap()), and there is no accompanying syscall failure in your
info, I just presumed it was 9i or earlier. Since this is 10g
and therefore mmap(), you might find that the problem is the
frankenkernel. See if you can find the mmap() failure return.
Watch /proc/meminfo too. The 2.4 RH "kernel" isn't the most
brilliant VM mankind has seen.
Since our product supports mixed linux clusters (e.g.,
sles/rh),
I've had the luxury of doing a lot of sles8/rhel3
apples-apples
testing and hands-down sles8 is more durable in the VM
department than rhel3. It gets EVEN more freaky if you use
that
4/4 split hugemem thingy...that thing acts more like a fish
flopping around on a hot sidewalk than a kernel. Talking
about
thrashing for page tables...gee... You can bring rhel3
systems
to their knees rather quickly with simple concurrent tar and
dd
executions of large files. Just hammer it... it will crush.
But, if you don't really do much with rhel3, it can stay up
as
is the case with this system set up for scheduled product
builds:
$ uname -a
Linux rhas3.pdx.polyserve.com 2.4.21-4.EL #1 Fri Oct 3 18:13:58 EDT 2003
i686 i686 i386 GNU/Linux
$ uptime
09:29:06 up 211 days, 17:35, 2 users, load average: 0.00, 0.00, 0.00
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