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Subject: Re: Slow EGTBs

Author: Tom Likens

Date: 17:50:48 01/16/03

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On January 16, 2003 at 16:46:10, Eugene Nalimov wrote:

>David, *fast* SCSI drive is noticeable faster than best IDE drive. Problem is
>not only 15k or 10k rpm vs. 7.2k rpm. Problem is also seek time. On best IDE
>drive I had seen it's something ~8-9ms. On *average* SCSI drive it's ~4-5ms.
>
>More, I have Itanium 2 system with one SCSI drive with 320Mb/sec SCSI disk
>drive, and one with "only" 160Mb/sec. And I regularly see the difference. Drive
>with 320Mb/sec is really faster when I am doing something with tens of gigabytes
>of data :-)
>
>Thanks,
>Eugene

Actually, this is almost exactly what I see when I profile my engine.
The routine do_decode takes about 10ms per call, which tells me that it is
*all* disk I/O.  By the way Eugene what does do_decode actually do?
I'm guessing it performs the Huffman decode.

regards,
--tom



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