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POPerformance hitches of some sort in a return or parameter (Java)
 

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  1. POPerformance hitches of some sort in a return or parameter (Java)
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    <p>I am running a complicated multithread java game, which is working perfectly with the exception of this function. This function, when called, approximately 0.01% of the time, will cause a thread hitch of a quarter of second. Through a series of debug lines and time measurements, it's absolutely down to this function (and three others almost exactly like it).</p> <p>The usage of this function is to provide the light level of a nearby block within a voxel engine game. It is only run when a section of the world is updated, which can happen alongside rendering.</p> <p>Please note: </p> <ul> <li>This function works accurately 100% of the time for its intended function.</li> <li>This function causes a thread hitch of approximately a quarter second 0.01% of the time.</li> <li>The variables are not synchronized. </li> <li>The function is never called more than once at a time in the program.</li> <li>All variables are valid fields of a larger, non-synchronized class.</li> <li>All variables are integers.</li> <li>The array <code>light[][][]</code> is a <code>byte[][][]</code>.</li> <li>This method is never called more than once at a time, as it is synchronized by a larger method on a wide interval.</li> </ul> <p>I'm pretty sure external synchronization is not the issue.</p> <p>What part(s) of this function may be causing an issue with thread synchronization, CPU overuse, or stack filling, and how can I go about improving performance to get rid of these render hitches?</p> <pre><code>public byte nsleftlighting(int[] coords){ if(coords[0]&lt;0)return 16; difx=chunkedx-chunks[coords[0]].X; difz=chunkedz-chunks[coords[0]].Z; if(coords[1]==0){ if(-difx&lt;=-(chunklimit)){return 16;} else if (-difx==0) { if(-difz&gt;=0){ proz=0; specialz=-difz; }else{ specialz=difz-1; proz=1; } if(chunks[chunkxyid[1][proz][0][specialz]].loaded){ return chunks[chunkxyid[1][proz][0][specialz]].light[15][coords[2]][coords[3]]; } else{return 16;} } else { if(-difz&gt;=0){ proz=0; specialz=-difz; }else{ specialz=difz-1; proz=1; } if(-difx&gt;0){ prox=0; specialx=-difx-1; }else{ specialx=difx; prox=1; } if(chunks[chunkxyid[prox][proz][specialx][specialz]].loaded){ return chunks[chunkxyid[prox][proz][specialx][specialz]].light[15][coords[2]][coords[3]]; } else {return 16;} } } if(coords[1]&gt;0){ return chunks[coords[0]].light[coords[1]-1][coords[2]][coords[3]]; } return 16; } </code></pre>
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