Array Placement Effects

• “Poor” data placement in memory can lead to the effect of

• cache thrashing.

• There are 2 techniques built into the compiler to avoid the cache thrashing:

• • array padding
  • leading dimension extension

• NOTE: leading dimension of arrays should be an odd number, if the multi-dimensional array has small extensions (e.g. a(64,64,64,..)) several leading dimensions should be odd numbers.

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