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POWhat CUDA resources are used by the display driver itself?
 

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  1. POWhat CUDA resources are used by the display driver itself?
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    <p>I am currently developing with <code>CUDA</code> on a <a href="http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-480/specifications" rel="nofollow">nVidia GTX 480</a>. According to the specification, the card has 15 Streaming Multiprocessors (SM) with 32 <code>CUDA</code> cores each.</p> <p>My code works with <code>N</code> blocks with 32 cores each.</p> <p>Ideally, if <code>N &lt;= 15</code>, I would expect that, since each block can be assigned to a different SM, each block will run just as fast as a single block. For 'N > 15', as the blocks start sharing the SMs, the performance of each individual block should decay. If <code>maxocc</code> is the maximum occupancy of my kernel, then the performance should stagnate as of <code>N &gt; 15*maxocc</code>, as not all blocks can be scheduled on the SMs.</p> <p>This is also <em>almost</em> what I observe in practice: The performance of each individual block starts to decay as of <code>N = 12</code> and the performance stagnates as of <code>N = 57</code>, i.e. it is as if there are three extra blocks occupying the SMs.</p> <p>I have no other programs running that use the GTX 480. The card is, however, connected to an external display running a text console, i.e. not X-windows. </p> <p>Now for the question: Does anybody know if using the GTX 480 to drive a console occupies <code>CUDA</code> resources? And if so, how much exactly? And how can I avoid that, i.e. how can I deactivate the video output without deactivating the <code>CUDA</code> device entirely?</p>
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