Buy a copy of FAST, and I'm sure Jeff will forgive you ;-)
Anthony Dzikiewicz wrote:
Sorry Dan, I guess your name sticks with me from being part of the list. My apologies to Jeff (if he is listening).
Anthony
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dan Fitzgerald Sent: Monday, March 07, 2005 4:26 PM To: [email protected] Subject: RE: [U2] Universe/Linux Performance Issue
I'm flattered, but those articles were by Jeff Fitzgerald, no relation.
"Our greatest duty in this life is to help others. And please, if you
can't help them, could you at least not hurt them?" - H.H. the Dalai Lama
"When buying & selling are controlled by legislation, the first thing to
be bought & sold are the legislators" - P.J. O'Rourke
Dan Fitzgerald
From: "Anthony Dzikiewicz" <[EMAIL PROTECTED]> Reply-To: [email protected] To: <[email protected]> Subject: RE: [U2] Universe/Linux Performance Issue Date: Mon, 7 Mar 2005 16:06:20 -0500
Thanks to all those that replied to my post. It appears that the performance problem that I experience on write intensive operations is not a Universe issue. It turns out that it is a problem (probably a
driver) for the disk array (Clariion CX300) or the SCSI card (Qlogic QlA2312).
It was very interesting to get into the details of file sizing and such. I pulled out all the old Spectrum articles by Dan Fitzgerald and Peggy Long (series on Hashed Files). I tried all different types of files to do performance tests. It turns out that the way our keys are structured, we only fit into Universe type 18. Even with that there is
a good amount of overflow. For now, I'll stick with dynamic. However,
I have resized some files with a MINIMUM.MODULUS override to prevent merge operations during the purges (we've got the space) and that seems
to make sense.
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