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<h1>19. TPC C Benchmark Kit</h1>
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<h2>19.6. Other Factors</h2>
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Benchmarks are run with a transaction monitor, usually Tuxedo.
This has not been discussed here. Multiprocessor questions have not
been addressed either. Virtuoso off the box should scale to about 4 CPU's
on any appropriate multithreaded, multiprocessor OS. Past 4 CPU's the
returns will diminish.
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Operating systems have different caching policies which must be taken into
account. If an OS does read ahead, that's OK. Generally OS intelligence
is harmful and should be turned off. For example, AIX reacts to its
disk write queue being full by turning off the writing process until it
has flushed enough of its own file cache. This instead of blocking the
writing thread and leaving the rest of the process to run.
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We may release more information on OS tuning in the future.
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