Daniel Egger wrote:
I can force it to use both CPUs now, but even with
200% utilization it is 2s slower to run this stupid
ubenchmark than on 1 CPU without threads.

Just a vague guess, but the multiprocessor GIMP pixel work scheduler might* farm alternating tiles to alternating CPUs. These are reasonably likely to have been allocated together and thus sit close together in memory, causing memory contention between CPUs.

* I haven't looked at it.
Adam D. Moss   -   [EMAIL PROTECTED]
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