Multiprocessor system VS one processor system
matrix at itlegion.ru
Mon Mar 15 22:49:04 PST 2004
> > of processes with short run periods you will get overal
> > perfomance somewhere near 5000Mhz. However, when i
> > subsituted two 500Mhz CPUs with 1500Mhz one (even with
> > less 2nd level cache) on a heavy loaded web server i notice
> > that sites started to load faster. So, it seems as
> > one 3X Mhz CPU is faster that two X MHz CPUs, at least
> > for web server with sql base and many perl scripts.
> This is true as long there is no load until the CPU cache comes
> into the game. It also depends on how the CPUs are connected to
> the main memory.
Let me make up a case.
1) Dual CPU X Mhz with Y KB of cache
2) Sinnge CPU with 2X Mhz and 2Y KB of cache
Which one is faster under FreeBSD? I think the
second one, because SMP overhead is gone.
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