[mpich-discuss] Clock synchronization

[Pavan Balaji]

Assuming TCP/IP communication and a 10-20 machines, once you do an 
MPI_Barrier, I don't expect the time difference between the machines to 
be more than a few 10s of microseconds, if not lesser.

  -- Pavan

On 04/01/2011 11:28 PM, Ravi Prakash wrote:
> Hi,
>
> I'm a n00b and I'm wondering if there is any documentation on what clock
> synchronization algorithm MPICH2 uses. I need to trigger events at the
> same time across multiple machines. What accuracy am I looking at?
>
> My machines are Windows Vista boxes with Dual dual-core Xeons connected
> by an ethernet 100Mbps LAN. Please let me know if there are any more
> relevant factors needed for an approximate figure. Is it a few ms / 10's
> of ms / 100's of ms / god forbid seconds? :)
>
> Cheers
> Ravi
>
>
>
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji