[Beowulf] precise synchronization of system clocks

Lux, James P james.p.lux at jpl.nasa.gov
Tue Sep 30 18:36:59 EDT 2008



>>
> ...
>>
>> Meanwhile, I'll try to find out where I can plug a serial cable into a
>> modern server...
>
> Ah, come on ;)
>
> A serial-USB dongle will do just fine, as will a USB-based GPS receiver...
>
No it won't, because the USB connection introduces significant
non-determinism in the timing. (unless you're running big EP jobs and just
want to synchronize to 1 second...)

Jim


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