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POCuda profiler says that my two kernels are expensive, however their execution time seems to be small
 

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  1. POCuda profiler says that my two kernels are expensive, however their execution time seems to be small
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    <p>I use two kernels, let's call them <code>A</code> an <code>B</code>.</p> <p>I run the CUDA profiler and this is what it returned:</p> <p><img src="https://i.stack.imgur.com/wPCAR.jpg" alt="enter image description here"></p> <p>The first kernel has 44% overhead while the second 20%.</p> <p>However, if I decide to find out the actual execution time by following this logic:</p> <pre><code>timeval tim; gettimeofday(&amp;tim, NULL); double before = tim.tv_sec+(tim.tv_usec/1000000.0); runKernel&lt;&lt;&lt;...&gt;&gt;&gt;(...) gettimeofday(&amp;tim, NULL); double after=tim.tv_sec+(tim.tv_usec/1000000.0); totalTime = totalTime + after - before; </code></pre> <p>The <code>totalTime</code> will be very small, somewhere around 0.0001 seconds.</p> <p>I'm new to CUDA and I don't understand exactly what's going on. Should I try and make the kernels more efficient or are they already efficient?</p>
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