Centuries ago, Nostradamus foresaw when liyuexin@neusoft.com (Li YueXin) would write:
> I found postgresql running on the multi CPU machine doesn't have
> better performance than single CPU machine. Can you explain the
> reason? And how to resolve the problem?
The classic reason for this is that if your system is primarily I/O
bound, adding extra CPUs is likely to have a relatively negligible
effect on system performance.
The far-and-away most enormous increase in transactions-per-second
that people seem to see from hardware changes come from putting in a
SCSI controller with large amounts of battery-backed cache.
Additional disk drives tends to be #2. More memory also helps.
The "problem" might very well be your expectation that adding CPUs
would necessarily have much effect on performance.
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