2VB1: Difference between revisions

2VB1 (view source)

1 byte added , 22 February 2011

2,684

edits

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 </table>
 == timings for processing sweep "e" as a function of MAXIMUM_NUMBER_OF_PROCESSORS and MAXIMUM_NUMBER_OF_JOBS ==
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   MAXIMUM_NUMBER_OF_PROCESSORS=4
   MAXIMUM_NUMBER_OF_JOBS=6
-performs best for a 2-Xeon X5570 (HT enabled, thus 24 cores) machine with 24GB of memory and a RAID1 consisting of 2 1TB SATA disks. It should be noted that the dataset has 27GB, and in 296 seconds this means 92 MB/s continuous reading. The processing time is thus limited by the disk access, not by the CPU. And no, the data are not simply read from RAM (tested by "echo 3 > /proc/sys/vm/drop_caches" before the XDS run).
+performs best for a 2-Xeon X5570 (HT enabled, thus 16 cores) machine with 24GB of memory and a RAID1 consisting of 2 1TB SATA disks. It should be noted that the dataset has 27GB, and in 296 seconds this means 92 MB/s continuous reading. The processing time is thus limited by the disk access, not by the CPU. And no, the data are not simply read from RAM (tested by "echo 3 > /proc/sys/vm/drop_caches" before the XDS run).