Data Structure Alignment - Allocating Memory Aligned To Cache Lines

Allocating Memory Aligned To Cache Lines

It would be beneficial to allocate memory aligned to cache lines. If an array is partitioned for more than one thread to operate on, having the sub-array boundaries unaligned to cache lines could lead to performance degradation. Here is an example to allocate memory (double array of size 10) aligned to cache of 64 bytes.

#include double *foo(void) { double *var;//create array of size 10 int ok; ok = posix_memalign((void**)&var, 64, 10*sizeof(double)); if(ok != 0) return NULL; return var; }

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