Cool! At what rate does your disk setup write sequential data, e.g.: time dd if=/dev/zero of=bigfile bs=8k count=500000
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(sized for 2x RAM on a system with 2GB) BTW - the Compaq smartarray controllers are pretty broken on Linux from a performance standpoint in our experience. We've had disastrously bad results from the SmartArray 5i and 6 controllers on kernels from 2.4 -> 2.6.10, on the order of 20MB/s. For comparison, the results on our dual opteron with a single LSI SCSI controller with software RAID0 on a 2.6.10 kernel: [EMAIL PROTECTED] dbfast]$ time dd if=/dev/zero of=bigfile bs=8k count=500000 500000+0 records in 500000+0 records out real 0m24.702s user 0m0.077s sys 0m8.794s Which calculates out to about 161MB/s. - Luke On 7/21/05 2:55 PM, "Mark Wong" <[EMAIL PROTECTED]> wrote: > I just ran through a few tests with the v14 patch against 100GB of data > from dbt3 and found a 30% improvement; 3.6 hours vs 5.3 hours. Just to > give a few details, I only loaded data and started a COPY in parallel > for each the data files: > http://www.testing.osdl.org/projects/dbt3testing/results/fast_copy/ > > Here's a visual of my disk layout, for those familiar with the database > schema: > http://www.testing.osdl.org/projects/dbt3testing/results/fast_copy/layout-dev4 > -010-dbt3.html > > I have 6 arrays of fourteen 15k rpm drives in a split-bus configuration > attached to a 4-way itanium2 via 6 compaq smartarray pci-x controllers. > > Let me know if you have any questions. > > Mark > ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
