Re: [Hdf-forum] Writing Performance

2011-08-15 Thread Mike Davis
On Fri, Aug 5, 2011 at 11:09 PM, Charles Darwin trok...@yahoo.com wrote: Hi, Hi Charles, 1. Is this the expected performance or am I possibly doing something wrong? Expected performance is tricky to answer, given how many variables are involved. A good way to check the upper level of

[Hdf-forum] Asynchronous writes with HDF5?

2011-08-15 Thread Matthieu Dorier
Hello, I have an application that uses HDF5 and collective I/O to write data, I wonder if it is possible to write asynchronously (still collectively) and without to much change in my code? I searched in the H5P part of the documentation, looking for any flag which would have turned I/O into

Re: [Hdf-forum] Writing Performance

2011-08-15 Thread Mitchell, Scott - IS
Speaking of h5perf_serial, I ran it (v 1.8.6) on my test machine (win 2008 32bit) and I'm seeing strange results for the HDF5 Read measurement. For a single run, I see 0.0 or 19 MB/s or whatever. When I run many iterations, I get something like Maximum Throughput @ 0.0 MB/s, Average Throughput