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[SergeyK] This is expected drop in performance when a Virtual Memory ( VM )file is used and
because of this CPUs idle and don't do too much. CPUs are waiting forcompletion of I/O
operations.
I have the same problem when I try to allocate a memory for avery large matrix and I have
a significant drop in performance until the memory is completely allocated.
...I have to allocate/deallocate arrays inside the loop because the massive size of the arrays. Does this allocate/deallcate cause the problem?
[SergeyK] Yes, ifthe VM is used and try to look at the Task Manager for more details.
If so, why was this not obvious in the small case, but caused problem in the larger case?...
[SergeyK] Please see the comment above.
Best regards,
Sergey
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Example, make
Change Ejd(iLooper)%unit(:) from ALLOCATABLE to POINTER. (same with Pred(iLooper)%unit(:)), pathtmp)
Create a seperate cache of these unit(:) allocations that represent your working set.
Then have your parallel do loop rotate the use of the pointers (allocating or reallocating only when necessary).
Note, each thread can have its own cache of these allocations.
Jim Dempsey
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