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-<pre>
- Using HDF5 with OpenMP
- ----------------------
-
-
-1. Introduction to OpenMP
--------------------------
-
- - For shared-memory parallelism
- - A combination of library and directives
- - Available for C/C++ and Fortran
- - SGI leading effort
- - Information at http://www.openmp.org and
- http://www.sgi.com/software/openmp
-
-2. Programming(SGI MPISpro compiler and C language)
----------------------------------------------------
-
- - Turn on compiler '-mp' option
- - Include 'omp.h' library in program
- - Use library functions, directives and environment variables
-
-
-3. Sample Programs
-------------------
-
-Appendix A contains four OpenMP-HDF5 test programs. (They are derived from
-the hdf5/examples/h5_write.c). The purpose of these program is to
-test OpenMP parallelism with the HDF5 library.
-
-All tests were run on modi4 with SGI MPISpro compiler(cc) and make.
-Program 1 and Program 2 are the working programs. Program 3 and Program 4
-work occasionally due to racing conditions.
-Follow the following steps to try the programs.
-
- a. have your hdf5 library compiled,
- b. go to hdf5/examples directory,
- c. add -mp option to the end of the CFLAGS list in the Makefile. If you
- have the compiled program in another directory, you should go to the
- examples in that directory.
- d. modify the hdf5/examples/h5_write.c according to the program attached
- here.
- e. use hdf5/tools/h5dump to examine the output file.
-
-
-4. Conclusion
--------------
-
-It is not safe to invoke HDF5 library calls via multiple threads in an
-OpenMP program. But if one serializes HDF5 calls as illustrated in Program 1,
-the HDF5 library works correctly with the OpenMP programs.
-
-The serialization of HDF5 calls will slow down the OpenMP program unnecessarily.
-Future study is needed to check possible ways to "un-seralize" the HDF5 calls.
-One possibility is that the HDF5 library has a beta-version of Thread-safe
-implmentation though it is for Pthreads environment. One can check on the
-feasibility of running OpenMP programs with this version of HDF5 Thread-safe
-library.
-
-
-
-<A HREF="openmp-hdf5.c">Appendix A: OpenMP-HDF5 Programs</A>
-
--------
-Updated: 2000/11/28
-Contact: hdfhelp@ncsa.uiuc.edu
-</pre>