Re: MySQL performance on a HP DL385G7
Posted by:
Rick James
Date: April 06, 2011 06:44PM
Another item... Do either of them use "NUMA" architecture in the CPU/Memory.
NUMA = Non-Uniform Memory Architecture. Each CPU has some of the RAM hanging off it. This means that one core (in one CPU) can reach some of the RAM directly, but to get to the rest of the RAM, it has to ask another CPU for help.
An undesirable side effect of this is when the OS tries to get smart about where it allocates physical RAM for itself and the processes. It might fill up one CPU's RAM, leave some space in the other. Then if it has a malloc request that "must" reside in that full RAM, it has to swap something out, even though there is spare RAM elsewhere.
I think there is a BIOS setting to make it distribute RAM more evenly.
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Re: MySQL performance on a HP DL385G7
April 06, 2011 06:44PM
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