Hi Manoj,
On Jun 8, 2010, at 9:27 PM, Manoj Rajagopalan wrote:
> Hi,
>
> This might be a very silly question: I am writing a multi-threaded
> application and am using my custom build (default flags) of HDF5 v1.8 of the
> C++ API. Can two threads simultaneously create private H5Group instances
> within a common H5 file and coherently write datasets into their respective
> H5Groups? I am tempted to assume this is not possible but I hear of parallel
> I/O and HDF5 so I could use some clarification.
Here's the FAQ for thread-safety:
http://www.hdfgroup.org/hdf5-quest.html#tsafe
> Also, am I right in understanding that parallel HDF5 I/O is possible only
> in an MPI context and that the PHDF5 must be built separately with MPI build
> info? Is it the same source code?
Yes, parallel HDF5 I/O is currently only possible when using MPI. The
HDF5 library is the same source code (albeit with different portions of the
code enabled), but the application would probably be different between a
sequential implementation and an MPI-oriented parallel implementation.
Quincey
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