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-   -   Which is faster, distributed or shared data? (http://www.cfd-online.com/Forums/cd-adapco/53835-faster-distributed-shared-data.html)

Cho June 17, 2004 03:52

Which is faster, distributed or shared data?
 
Hello all.

I use starHPC on 4 node linux machines. Master node has a 120Gb hard disk and 2Gb memory, and each slave node has a 40Gb hard disk and 2Gb memory. Each node communicates by mpich through 1000Base-T ethernet. NFS is used to share user's data on master node.

I can choose distributed data and shared data, but I don't know which should I use.

Does anyone know which is better(faster),distributed or shared data?

Thanks advance.

thomas June 17, 2004 03:55

Re: Which is faster, distributed or shared data?
 
Well, I am not an expert. But I think you'll get much better performance with distributed data on a cluster, because traffic through network will be bottleneck for performance.

steve June 17, 2004 16:36

Re: Which is faster, distributed or shared data?
 
Distributed data will be faster. That way you are not tieing up the ethernet with I/O while you are running the job. Then the ethernet can be dedicated to message passing and all the I/O occurs only at the start and end of a run.


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