57 lines
2.1 KiB
HTML
57 lines
2.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<META http-equiv="Content-Type" content="text/html; charset=Windows-1252">
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<TITLE>Benchmark</TITLE>
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<LINK href="style.css" rel="stylesheet" type="text/css">
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</HEAD>
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<BODY>
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<H1>Benchmark</H1>
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<P>This form allows you to measure the performance of your computer.</P>
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<P>There are two tests:<P>
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<OL>
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<LI>Compression with LZMA method
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<LI>Decompression with LZMA method
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</OL>
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<P>The benchmark shows a rating in MIPS (million instructions per second).
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The rating value is calculated from the measured speed, and it
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is normalized with results of Intel Core 2 CPU with multi-threading option switched off.
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So if you have modern CPU from Intel or AMD, rating values in single-thread mode
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must be close to real CPU frequency.</P>
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<P>You can change the dictionary size to increase memory usage.
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Also you can change the number of threads.</P>
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<P>The <B>CPU Usage</B> column shows the percentage of time the processor is working.
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It's normalized for a one-thread load. For example, 180% CPU Usage for 2 threads
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can mean that average CPU usage is about 90% for each thread.</P>
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<P>The <B>Rating / Usage</B> column shows rating normalized for 100% of CPU usage.
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That column shows performance of the one CPU thread. It must be close to real CPU frequency,
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if you have modern CPU.</P>
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<P>The <B>Total rating</B> shows averages of the compressing and decompression ratings.</P>
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<P>Compression speed and rating strongly depend from memory (RAM) latency.
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<P>Decompression speed and rating strongly depend on CPU integer operations.
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For example, an Intel Pentium 4 has big branch
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misprediction penalty (which is effect of long pipeline) and pretty slow
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multiply and shift operations. So, the Pentium 4 has pretty low decompressing
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ratings.</P>
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<P>Also the program checks possible errors.
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If the program shows some error message, in most cases it means that
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your RAM is defective. If so, don't use 7-Zip for
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compressing data, since such errors can lead to data losses.</P>
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</BODY>
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</HTML>
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