Date: Mon, 13 Apr 1998 02:55:13 -0700 From: Studded <Studded@san.rr.com> To: freebsd-hackers@FreeBSD.ORG Subject: "unofficial" buildworld stats with IDE + SCSI Message-ID: <3531E101.591C98CE@san.rr.com>
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Without revisiting the previous debate regarding the proper way to set up a worldstone test, I thought I'd report the results of a test I did here locally involving relative disk speeds in case anyone's interested. I run -Stable, and am trying to decide how to spread my system across two disks since I just freed up some space on the old IDE disk. I have a WD Caviar 1.6G disk and an IBM DCAS 34300 4G SCSI UW drive. My main question was whether putting /usr/src or /usr/obj on the "slow" IDE disk would yield the greatest buildworld performance. I deleted my old sources (for an unrelated test, but the timing was good :), cvsup'ed -Stable and did the local modifications that I usually do. I don't build perl, xntpd (I use more up to date versions), qcam, uucp, or profiled libraries. I build everything with -O -pipe. I did the test the same way each time, with the same partitions on the IDE and SCSI disks as obj or src depending. Always starting with a clean /usr/obj I did 'make -DNOCLEAN -DCLOBBER buildworld.' I didn't use any log file for the build to avoid the extra variable. I have all the performance options for AHC in my kernel, /usr/src was mounted noatime and /usr/obj was mounted noasync,noatime. I used the same exact sources for each test, mv'ing them as needed. I did the test 3 ways: With /usr/src on IDE and /usr/obj on SCSI 2 hours 8 minutes With /usr/src on SCSI and /usr/obj on IDE 2 hours 6 minutes With both on SCSI 2 hours 14 minutes I imagine that if I had two fast SCSI disks those numbers would be a lot different. :) However I thought it was pretty interesting that it doesn't matter which is on the "slow" disk. In case anyone's wondering I did one installworld after the last buildworld and it took 14 minutes. That total time is virtually identical to the total make world time I've been seeing with mounting /usr/obj on the IDE disk for the last few weeks. I hope this is of use to someone. More details are available on request. Doug -- *** Chief Operations Officer, DALnet IRC network *** *** Proud operator, designer and maintainer of the world's largest *** Internet Relay Chat server. 5,328 clients and still growing. *** Try spider.dal.net on ports 6662-4 (Powered by FreeBSD) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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