Chris Lawrence <chris@nrsys.org> writes: > I've done a good amount of fine tuning of the database, but I'm > finding any query of complexity taking sometimes as much as 30x longer > to execute than on same-era x86 hardware running Debian. MySQL query execution is single threaded (one query in one thread). The T2000 chips (and T1000 before it) have absolutely awful single threaded performance - they're all about concurrency, not single thread perf. So these are really not the machines to run complex single queries on. They're more suited to many small queries at once. What doesn't help is that unaligned memory accesses abound in the MySQL server (I once switched the GCC flags for generating code to handle unaligned access... urgh) 30x sounds a little high... but I wouldn't be surprised if you had said 10 or 20x. It'll also very much depend on MySQL version you're using. ASsuming current debian, 5.5 should be the best possible... -- Stewart Smith
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