Intel® Math Kernel Library 11.1 Update 3 User's Guide
Hybrid offload binaries of the Intel Optimized MP LINPACK Benchmark inform you how many Intel Xeon Phi coprocessors are detected during the run. The output early prints a line like this:
Number of Intel Xeon Phi coprocessors: 1
This number counts only one Intel Xeon Phi coprocessor per MPI process.
If Intel Xeon Phi coprocessors are available on your cluster and you expect offloading to occur, but the number printed is zero, it is likely that the correct compiler environment was not loaded. Specifically, check whether the LD_LIBRARY_PATH environment variable contains shared libraries libcoi_host.so.0 and libscif.so.0, which are installed by the Intel® Manycore Platform Software Stack (Intel® MPSS).
When running the Intel Optimized MP LINPACK Benchmark, you can use the standard Intel MKL environment variables to adjust the behavior of your runs. However not all the environment variables are available for the hybrid offload binaries, which use a different set of environment variables.
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Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice. Notice revision #20110804 |