On Tue, May 16, 2006 at 09:24:38AM +0200, Zeugswetter Andreas DCP SD wrote: > > > > Given that any time that happens we end up caring much less about > CPU > > > usage and much more about disk IO, for any of these cases that use > > > non-random access, compressing the data before sending it to disk > would > > > potentially be a sizeable win. > > > > Note however that what the code thinks is a spill to disk and what > > actually involves disk I/O are two different things. If you think > > of it as a spill to kernel disk cache then the attraction is a lot > > weaker... > > Yes, that is very true. However it would also increase the probability > that spill to disk is not needed, since more data fits in RAM.
That's a pretty thin margin though, depending on how good the compression is. This also assumes that you have a compression algorithm that supports random access. -- Jim C. Nasby, Sr. Engineering Consultant [EMAIL PROTECTED] Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461 ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings