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| Hi I'm running some code on AIX and when compiled with xlc (v5 or v7) it runs much slower than when using gcc (3.3.2). It actually only takes half as long to run when using gcc. I'm using -O2 optimisation on xlc and -O2 on gcc. Looking at the timings everypiece of code seems to take longer not just one piece. I've tried everything and cannot figure out what this could be. I can see that the IDRSS using gcc is 423993 and xlc is 1411887. I'm not quite sure how to interpret this. Does anyone think it could be being throttled by memory access? TIA Mark |
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