From: <rk...@nc...> - 2004-07-02 04:17:01
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p.s. Kursad, there is something else that I thought might be useful to mention: even though the Pentium 4 has 18 counters, multiplexing may still be enabled even when counting less than 18 events. That's because the counters are not symmetric - they cannot all count the same events. Additionally, some events require two counters (for example, retired floating point instructions), so that takes up additional resources. If you get an output XML document, you can check whether multiplexing was enabled either directly (it's listed as one of the element attributes) or in the psprocess report. Rick |