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There are three mode of operations with KNC: Therefore, the following keyword extensions are not applicable in a KNL processor environment: This tool detects all dependent libraries, then transfers the native application and all dependent libraries to the coprocessor and finally runs it on the coprocessor.
Inc, use the sde to emulate a knl platform: First, source the environment variables as usual: To install the SDE, developers can download the kit at https: Although SIMD instructions may be kjc via inline assembly code or compiler intrinsics, they are platform dependent and unlikely to work between different platforms. Vector output resulting from shuffle data for pattern ‘AAAA’: Therefore, lnc your application uses KNC intrinsics, you may refer to the above documents to check whether or not those intrinsics are available for KNL.
Optimization methods that benefit applications for KNC should also apply to the KNL processor, although some minor changes will probably be required.
Note that building applications for the KNL processor is lightly different than building it for a traditional as mentioned earlier. However, since the application is running on a host the KNL processorall environment variables are set for the host and the MIC prefix is not needed anymore.
To use KNL effectively, applications should effectively use VPU instructions on vector data, good locality of reference, and utilizes caches well in its core computations.
Porting Applications from Knights Corner to Knights Landing
It is assumed that developers are already familiar with KNC. To use Intel Cilk Plus, the header file cilk.
Share Tweet Share Send. For more complete information about compiler optimizations, see our Optimization Notice. Cluster applications also need fabric scaling.
Finally, use the sde to emulate a knl platform:. This restriction will be removed in MKL Vector output resulting from multiple input1 and input2: Depending on each application, developers can refer to the following topics which can be useful for their applications.
To run a native KNC application, the micnativeloadex tool can be used. For example, if you want to run a binary program, called application, on the KNL platform, and output the first 50 instruction forms: KNL has better hardware prefetching, and therefore less need for software prefetching i. You may refer to the following document for information on different optimization techniques including prefetching data: Set the path to the SDE: With limited support, MKL Developers can find more information about AVX in the following documents: The below example shows how to allocate and align data to byte in memory.
MKL code will be then dispatched automatically.
Appendix B shows a program using the offload model on KNC. We can take advantage of AVX by recompiling the application as shown below: For example, if you want to run a binary program, called application, on the KNL platform, and output the first 50 instruction forms:.
Appendix C shows a MPI sample code that uses intrinsics to mimic multiplication.
Porting Applications from Knights Corner to Knights Landing | Intel® Software
Vector output resulting from permute data for pattern ‘ABCD’: For help on code generation, from the command prompt type. For information on how to read the instruction mix histogram report, please refer to this white paper https: The top 20 basic blocks are always printed in the output file by default. In the KNL-F processor i.
This document highlights these differences. The SDE supports a mix histogram tool, which can generate the instruction mix histogram. To run an application on the KNL processor, we just launch the application knf in the processor; the micnativeloadex tool is not necessary anymore.