[bgl-discuss] Blue Gene slow I/O

["Sindhi, Abdul Waris" <abdul.sindhi@xxxxxxxxxx>]

We are running a CFD application on the Blue Gene that performs sequential
I/O on all the processors at around the same time. The case we currently run
is out of user homedir. We are currently running a 40 processor breakup, and

the read/writes are to a file sized around ~20MB. 

The read/write performance looks pathologically slow at around 20-30 times
slower when compared to normal runs. We are wondering if anyone else has
run into similar issues with slow I/O on the Blue Gene ?

Thanks,
A. Waris Sindhi
High Performance Technical Computing
Pratt & Whitney, UTC
(860)-565-8486

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