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Message Posted: Thu, 04 Oct 2012 @ 10:15:39 GMT
Useful info thanks. I suspect that the reason for "The overhead of CPU seems to be low " is because on the 2690 the compression is done via a separate card/cpu and therefore what you are measuring as cpu usage (resusage, dbql etc) does not include the compress/decompress overhead. Please don't get me wrong I think hardware compression has its uses, I'm simply pointing out that I don't think you can measure the overhead of this processing using normal sources of data.
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