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My Mac Pro boot OS is on a 150 Gb striped raid made from outer partitions on two 1Tb drives in bays 1 and 2. There is 95 Gb free on the boot. 8 Gb RAM.
My normal scratch is on a dedicated 150 Gb striped raid made from the outer partitions of the 1Tb drives in bays 3 and 4.
I ran the Retouche artists Photoshop speed test with the scratch on the dedicated separate scratch, and on the boot volume.
The results were:
Average time of several runs with dedicated scratch was 45.5 seconds. Average time with scratch on boot was 43.9 seconds.
Since I was expecting the dedicated scratch to be faster I was a bit surprised so I repeated the exercise on my MacBook Pro (1.83 MHz, 2 Gb RAM). Normal scratch is the boot volume which a 5400 rpm 500 Gb Samsung with 150 Gb free, no partitions. For this exercise, I connected an eSATA via an express card to provide a dedicated scratch alternative.
Average time with dedicated separate scratch was 152 seconds. Average time with scratch on boot was also 152 seconds.
All Retouche Tests were done with 40 history states and 4 cache levels, which results in about 7Gb of scratch being used. On both machines Quickbench shows the scratch as just a few percent faster than the boot.
I repeated the Mac Pro tests with the test file located on different drives, including the boot and the scratch, but there were no significant differences.
What has happened to the standard advice about dedicated scratch for Photoshop?
Any thoughts ? (other than that I have too much time on my hands!)
Mike
My normal scratch is on a dedicated 150 Gb striped raid made from the outer partitions of the 1Tb drives in bays 3 and 4.
I ran the Retouche artists Photoshop speed test with the scratch on the dedicated separate scratch, and on the boot volume.
The results were:
Average time of several runs with dedicated scratch was 45.5 seconds. Average time with scratch on boot was 43.9 seconds.
Since I was expecting the dedicated scratch to be faster I was a bit surprised so I repeated the exercise on my MacBook Pro (1.83 MHz, 2 Gb RAM). Normal scratch is the boot volume which a 5400 rpm 500 Gb Samsung with 150 Gb free, no partitions. For this exercise, I connected an eSATA via an express card to provide a dedicated scratch alternative.
Average time with dedicated separate scratch was 152 seconds. Average time with scratch on boot was also 152 seconds.
All Retouche Tests were done with 40 history states and 4 cache levels, which results in about 7Gb of scratch being used. On both machines Quickbench shows the scratch as just a few percent faster than the boot.
I repeated the Mac Pro tests with the test file located on different drives, including the boot and the scratch, but there were no significant differences.
What has happened to the standard advice about dedicated scratch for Photoshop?
Any thoughts ? (other than that I have too much time on my hands!)
Mike
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