> On a computational chemistry list I subscribe to there is a > current thread about multi-cpu systems needing to have the cpu > frequencies synced (this is in a Linux context). This is > evidently not just having the cpus running at nominally the same > frequency but something else in addition. A posting in the thread > said variations less than 0.1% were not problematic. However, the > poster said it was an issue in a dual cpu, dual core system he had > set up. > > My questions are: > 1. Is this real or an urban legend?
If CPUs use the same FSB (as is the case with dual-core chip), they are already in sync. Right? For system that use multiple FSB clocks [like dual-(dualcore-CPU) systems], it might be possible to vary the clocks (as much as the manufacturer allows without hw modifications: e.g., SpeedStep, or something similar). Why someone would want to have CPUs running at precisely the same frequency is beyond my imagination. > Bud Dodson [SorAlx] ridin' VN1500-B2 _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
