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POCode is slower on Linux as compared to Windows
 

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  1. POCode is slower on Linux as compared to Windows
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    <p>After modifying my C code, (written originally for Windows and compiled under VS 2008), I ran it on Linux. To my surprise it is now at least 10 times slower than windows version. </p> <p>Using Profiler tools I figured out that the following function is consuming most of the time spent in the application:</p> <pre><code>/* advance by n bits */ void Flush_Buffer(N) int N; { int Incnt; ld-&gt;Bfr &lt;&lt;= N; Incnt = ld-&gt;Incnt -= N; if (Incnt &lt;= 24) { if (System_Stream_Flag &amp;&amp; (ld-&gt;Rdptr &gt;= ld-&gt;Rdmax-4)) { do { if (ld-&gt;Rdptr &gt;= ld-&gt;Rdmax) Next_Packet(); ld-&gt;Bfr |= Get_Byte() &lt;&lt; (24 - Incnt); Incnt += 8; } while (Incnt &lt;= 24); } else if (ld-&gt;Rdptr &lt; ld-&gt;Rdbfr+2044) { do { ld-&gt;Bfr |= *ld-&gt;Rdptr++ &lt;&lt; (24 - Incnt); Incnt += 8; } while (Incnt &lt;= 24); } else { do { if (ld-&gt;Rdptr &gt;= ld-&gt;Rdbfr+2048) Fill_Buffer(); ld-&gt;Bfr |= *ld-&gt;Rdptr++ &lt;&lt; (24 - Incnt); Incnt += 8; } while (Incnt &lt;= 24); } ld-&gt;Incnt = Incnt; } } </code></pre> <p>This function was taking negligible time on windows. on Linux it is taking taking close to 14 sec. What wrong I have committed here? </p> <p>There are no system calls here so this code section should be independent of OS specific calls and thus should run in identical time. </p> <p>(My Guess: This function is being called multiple times, so may be the profiler is accumulating the time of all the calls too. In such a case I think one of the issues might be that the function is not getting its input parameter quickly as compared to windows case. )</p> <p>What wrong I have committed here? Any guess? </p> <p>Rgrds, </p> <p>H </p>
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    1. COThis question is meaningless unless you specify at least (1) the compiler options you used, and (2) how you're measuring the time spent.
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    2. COHow did you compile your code (what compiler, what options, (what warning level))?
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    3. COAnother guess is , may be since data type size is different on the two machines, I might be ending up doing more computations at low level on Linux. May be I should cross check that the size of the data types are matching on the two system. Any idea I am going in the right direction?
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