Messages in this thread | | | Subject | Evaluation of three I/O schedulers | From | "Peter Wong" <> | Date | Mon, 30 Jun 2003 09:21:24 -0500 |
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We used 2.5.72+mm1 to evaluate three I/O schedulers, namely anticipatory, deadline and complete fair queueing under a very heavy database workload on an 8-way Pentium 4 machine. The workload is a decision support system doing mostly sequential I/O and each run takes about one hour. All three runs finished completely without encountering functional problems, and achieved similar performance level.
The 8-way machine has Pentium 4 2.0 GHz processors, 16 GB physical memory, 2MB L3 cache, 8 FC controllers with 80 disks. Hyperthreading was turned on for the three runs. The CPU utilization is similar for all three runs: 65% user, 7% system and 28% idle.
Regards, Peter
Peter Wai Yee Wong IBM Linux Technology Center Performance Team email: wpeter@us.ibm.com
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