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This document shows the basic changes the developer will have to make, and does not focus on optimization. It is assumed that developers are already familiar with KNC. Cluster applications also need fabric scaling. This document highlights these differences.
At the time this document was written, KNL hardware was not yet released. The current SDE version 7.
Porting Applications from Knights Corner to Knights Landing | Intel® Software
To install the SDE, developers can download the kit at https: The SDE supports a mix histogram tool, which can generate the instruction mix histogram. The top 20 basic blocks are always printed in the output file by default.
For example, if you want to run a binary program, called application, on the KNL platform, and output the first 50 instruction forms:. For information on how 0900 read the instruction mix histogram report, please refer to this white paper https: This section provides suggestions for developers who are porting their KNC coprocessor applications to the KNL processor. Depending on each application, developers can refer to the following topics which can be useful for their applications.
Although SIMD instructions may be mnc via inline assembly code or compiler intrinsics, they are platform dependent and unlikely to work between different platforms.
Porting Applications from Knights Corner to Knights Landing
Therefore, if inc application uses KNC intrinsics, you may refer to the above documents to check whether or not those intrinsics are available for KNL. For help on code generation, from the command prompt type.
We can take advantage of AVX by recompiling the application as shown below:. Appendix A shows a simple program using different types of shuffle and how multiple intrinsics are compiled with AVX Vector output resulting from shuffle data for pattern ‘AAAA’: Vector output resulting from shuffle data for pattern ‘ABCD’: Vector output resulting from permute data for pattern ‘ABCD’: Vector output resulting from multiple input1 and input2: The KNL processor can be booted as a host processor: As such, there is no need to offload.
To run a native KNC application, the micnativeloadex tool can be used. This tool detects all dependent libraries, then transfers the native application and all dependent libraries to the 0900 and finally runs it on the coprocessor. To run an application on the KNL processor, we just launch the application directly in the processor; the micnativeloadex tool is not necessary anymore.
Appendix B shows a program using the offload model on Inc. We need to recompile it without the offload option for the KNL processor:.
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Finally, use the sde to emulate a knl platform:. Number of Target devices installed: 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: The below example shows 0900 to allocate and align data to byte in memory. Therefore, the following keyword extensions are not applicable in a KNL processor environment: In the KNL-F processor i.
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There are three mode of operations with KNC: MKL code will be then dispatched automatically. With limited support, MKL This restriction will be removed in MKL To use OpenMP pragmas, the command line argument —openmp is needed and the header file omp.
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. Kncc use Nkc Cilk Plus, the header file cilk.
However, there knnc some minor differences compared to KNC: Note that building applications for the KNL processor is lightly different than building it for a traditional as mentioned earlier. Knv C shows a MPI sample code that uses intrinsics to mimic multiplication. 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. Optimization methods that benefit applications for KNC should also apply to the KNL processor, although some minor changes will probably be required.
Share Tweet Share Send. Set the path to the SDE: For example, if you want to run a binary program, called application, on the KNL platform, and output the first 50 instruction forms: Developers can find more information about AVX in the following documents: We can take advantage of AVX by recompiling the application as shown below: First, source the environment variables as usual: We need to recompile it without the offload option for the KNL processor: Finally, use the sde to emulate a knl platform: For more complete information about compiler optimizations, see our Optimization Notice.