Slow performance when dumping core
From: Fredrik Robertsson (frero_at_swip.net)
Date: 05/27/04
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To: <sunmanagers@sunmanagers.org> Date: Thu, 27 May 2004 10:48:48 +0200
Hi,
I have a problem with two machines: when the application crashes and wants
to dump core the disk write speed goes down to about 1MB/s as opposed to the
normal 100-200MB/s of these devices. So the slow speed only shows its ugly
head when writing the corefiles to disk. I have no problems whatsoever with
"normal" I/O-operations. When testing disk performance I have no problem
exceeding the 200MB/s theoretical maximum, and most of the time I get
somewhere between 100-200MB/s (depending on file size and I/O-request size,
so that is buffer/cache related).
The machines are Sun Fire 240 and 480. Both of them have 2 CPU's and 4GB of
memory. They both have JNI FCE-6460-N FC HBA's, and they are both connected
to a Hitachi 9980V through two Brocade 12000. They are running Solaris 8
(one with kernel 117350-02 and the other with 108528-29) with Veritas
Foundation Suite 3.5 MP1 and version 5.3.0.1 of the JNI driver.
The application is developed in-house and has a memory leak somewhere. So
when it reaches 4GB of allocated memory it crashes and tries to dump core.
The developers says it's tricky to find the leak unless they get a corefile,
and with 1MB/s that's over an hour of downtime which we cannot allow for.
Anyone out there had the same problem as poor me?
Med vdnlig hdlsning/Regards,
Fredrik Robertsson
Systems Architect
Network Engineering
Tele2 Sverige AB
+46-(0)8-5626 4000
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