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