Intel® Advisor

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Intel Advisor provides tools that analyze your running serial program to collect and present data. These tools help you make decisions about adding parallelism to your program.

Where should I add parallelism? To locate where your program spends its time, run the Survey tool to profile your serial program (Release build suggested). View the Survey Report to identify at least one possible parallel code region (site).

Reducing Site Overhead

Site overhead is the time spent starting up (and shutting down) parallel execution. This overhead includes creating threads, scheduling those threads onto cores, and waiting for the threads to begin executing. In some parallel framework implementations, real threads are only created once - rather than destroying them at the end of a parallel site; the implementation suspends the threads. In this case, the full site overhead will be experienced only the first time a site is entered.

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