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With an offset of 0, the process's first thread 0 will be assigned to thread 0. With a permute value of 1, thread n+1 is assigned to a consecutive core. Specifying 1,0 sets permute and offset values of the thread assignment.
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Specifying compact will assign the n+1 thread to a free thread context as close as possible to thread n.Ī default granularity=core is implied if no granularity is explicitly specified. Hence a combination of these two options, will spread the threads evenly across sockets, with one thread per physical core. Specifying scatter distributes the threads as evenly as possible across the entire system. This ensures that there is only one thread per core on cores supporting HyperThreading Technology Specifying granularity=fine selects the finest granularity level and causes each OpenMP or auto-par thread to be bound to a single thread context. Example: KMP_AFFINITY=granularity=fine,scatter Please see the Thread Affinity Interface article in the Intel Composer XE Documentation for more details. Offset: The offset specifier indicates the starting position for thread assignment. A value for permute forces the mappings to make the specified number of most significant levels of the sort the least significant, and it inverts the order of significance. Permute: The permute specifier is an integer value controls which levels are most significant when sorting the machine topology map. scatter Specifying scatter distributes the threads as evenly as possible across the entire system. Type: compact Specifying compact assigns the OpenMP thread +1 to a free thread context as close as possible to the thread context where the OpenMP thread was placed. Modifier: granularity=fine Causes each OpenMP thread to be bound to a single thread context.
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It applies to binaries built with -openmp and -parallel (Linux and Mac OS X) or /Qopenmp and /Qparallel (Windows). The value for the environment variable KMP_AFFINITY affects how the threads from an auto-parallelized program are scheduled across processors. Location of additional Microsoft Visual Studio librariesĬommands and Options Used to Submit Benchmark Runs submit= specperl -e "system sprintf qq, (1.] GF (/Qvc7 and above), /Gf (/Qvc6 and below), and /Ob2 Windows platforms, -O3 sets the following: Use floating-point calculations and process large data sets. The O3 option is recommended for applications that have loops that heavily
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The optimizations may slowĭown code in some cases compared to O2 optimizations. Memory access transformations take place. The O3 optimizations may not cause higher performance unless loop and Performs more aggressive data dependency analysis than for O2, which
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ax or -x (Linux) or with options /Qax or /Qx (Windows), the compiler On IA-32 and Intel EM64T processors, when O3 is used with options Padding the size of certain power-of-two arrays to allow Loop unrolling, including instruction scheduling Such as prefetching, scalar replacement, and loop and memoryĪccess transformations.
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Og, /Oi-, /Os, /Oy, /Ob2, /GF (/Qvc7 and above), /Gf (/Qvc6Įnables O2 optimizations plus more aggressive optimizations, On IA-32 Windows platforms, -O2 sets the following: structure assignment lowering and optimizations strength reduction/induction variable simplification global instruction scheduling and control speculation The following capabilities for performance gain: Intra-file interprocedural optimizations, which include: