Messages in this thread | | | Date | Thu, 20 Feb 2003 21:25:54 -0800 | From | Andrew Morton <> | Subject | iosched: time to copy many small files |
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This test simply measures how long it takes to copy a large number of files within the same filesystem. It creates a lot of small, competing read and write I/O's. Changes which were made to the VFS dirty memory handling early in the 2.5 cycle tends to make 2.5 a bit slower at this.
Three copies of the 2.4.19 kernel tree were placed on an ext2 filesystem. Measure the time it takes to copy them all to the same filesystem, and to then sync the system. This is just
cp -a ./dir-with-three-kernel-trees/ ./new-dir sync
The anticipatory scheduler doesn't help here. It could, but we haven't got there yet, and it may need VFS help.
2.4.21-pre4: 70 seconds 2.5.61+hacks: 72 seconds 2.5.61+CFQ: 69 seconds 2.5.61+AS: 66 seconds
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