Misc/abrash-black-book
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Remove colour attributes from body and strip most of the font tags out

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James Gregory 2013-12-30 13:57:02 +11:00
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<P>By the way, don&rsquo;t think that just because very large block sizes don&rsquo;t much improve performance, it wasn&rsquo;t worth using restartable blocks in Listing 5.1. Listing 5.1 runs more than three times more slowly with a block size of 32 bytes than with a block size of 4K, and any byte-by-byte approach would surely be slower still, due to the overhead of repeated calls to DOS and/or the C stream I/O library.
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<P>Restartable blocks do minimize the overhead of DOS file-access calls in Listing 5.1; it&rsquo;s just that there&rsquo;s no way to reduce that overhead to the point where it becomes worth attempting to further improve the performance of our relatively efficient search engine. Although the search engine is by no means fully optimized, it&rsquo;s nonetheless as fast as there&rsquo;s any reason for it to be, given the balance of performance among the components of this program.</P>
<H3><A NAME="Heading10"></A><FONT COLOR="#000077">Always Look Where Execution Is Going</FONT></H3>
<H3><A NAME="Heading10"></A>Always Look Where Execution Is Going</H3>
<P>I&rsquo;ve explained two important lessons: Know when it&rsquo;s worth optimizing further, and use restartable blocks to process large data sets as a series of blocks, with each block handled at high speed. The first lesson is less obvious than it seems.
</P>
<P>When I set out to write this chapter, I fully intended to write an assembly language version of Listing 5.1, and I expected the assembly version to be much faster. When I actually looked at where execution time was going (which I did by modifying the program to remove the calls to the <B>read()</B> function, but a code profiler could be used to do the same thing much more easily), I found that the best code in the world wouldn&rsquo;t make much difference.</P>
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<hr width="90%" size="1" noshade>
<div align="center">
<font face="Verdana,sans-serif" size="1">Graphics Programming Black Book &copy; 2001 Michael Abrash</font>
Graphics Programming Black Book &copy; 2001 Michael Abrash
</div>
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