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OpenACC Tutorial - Adding directives: Difference between revisions
→How is ported code performing ?
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The results are correct. However, not only do we not get any speed up, but we rather get a slow down by a factor of almost 4! Let's profile the code again using NVidia's visual profiler (<tt>nvvp</tt>). This can be done with the following steps: | The results are correct. However, not only do we not get any speed up, but we rather get a slow down by a factor of almost 4! Let's profile the code again using NVidia's visual profiler (<tt>nvvp</tt>). This can be done with the following steps: | ||
# Start <tt>nvvp</tt> with the command <tt>nvvp &</tt> (the <tt>&</tt> sign is to start it in the background | # Start <tt>nvvp</tt> with the command <tt>nvvp &</tt> (the <tt>&</tt> sign is to start it in the background) | ||
# Go in File -> New Session | # Go in File -> New Session | ||
# In the "File:" field, search for the executable (named <tt>challenge</tt> in our example). | # In the "File:" field, search for the executable (named <tt>challenge</tt> in our example). | ||