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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
+<HTML>
+<HEAD>
+  <META http-equiv="Content-Type" content="text/html; charset=Windows-1252">
+  <TITLE>b (Benchmark) command</TITLE>
+  <LINK href="style.css" rel="stylesheet" type="text/css">
+</HEAD>
+
+<BODY>
+
+<H1>b (Benchmark) command</H1>
+
+<P>Measures speed of the CPU and checks RAM for errors.</P>
+
+<H4>Syntax</H4>
+
+<PRE class="syntax">
+b [number_of_iterations] [-mmt{N}] [-md{N}] [-mm={Method}]
+</PRE>
+
+<P>There are two tests:<P>
+<OL>
+  <LI>Compressing with LZMA method
+  <LI>Decompressing with LZMA method
+</OL>
+
+<P>The benchmark shows a rating in MIPS (million instructions per second).
+The rating value is calculated from the measured CPU speed and it
+is normalized with results of Intel Core 2 CPU with multi-threading option 
+switched off. So if you have Intel Core 2 Duo, 
+rating values must be close to real CPU frequency.</P>
+
+<P>You can change the upper dictionary size to increase memory usage by -md{N} switch.
+Also, you can change the number of threads by -mmt{N} switch.</P>
+
+<P>The <B>Dict</B> column shows dictionary size. For example, 21 means 2^21 = 2 MB.</P>
+
+<P>The <B>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>R / U</B> column shows the rating normalized for 100% of CPU usage.
+That column shows the performance of one average CPU thread.</P>
+
+<P><B>Avr</B> shows averages for different dictionary sizes.</P>
+<P><B>Tot</B> shows averages of the compression and decompression ratings.</P>
+
+<P>Compression speed and rating strongly depend on memory (RAM) latency.
+
+<P>Decompression speed and rating strongly depend on the integer performance of the CPU.
+For example, the Intel Pentium 4 has big branch
+misprediction penalty (which is an effect of its long pipeline) and pretty slow
+multiply and shift operations. So, the Pentium 4 has pretty low decompressing ratings.</P>
+
+<P>You can run a CRC calculation benchmark by specifying -mm=crc.
+That test shows the speed of CRC calculation in MB/s. The first column shows the size of the block.
+The next column shows the speed of CRC calculation for one thread. The other columns are results
+for multi-threaded CRC calculation.</P> 
+
+
+<H4>Examples</H4>
+
+<PRE class="example">
+7z b
+</PRE>
+runs benchmarking.
+
+<PRE class="example">
+7z b -mmt1 -md26
+</PRE>
+runs benchmarking with one thread and 64 MB dictionary.
+
+<PRE class="example">
+7z b 30
+</PRE>
+<P>runs benchmarking with default settings for 30 iterations.</P>
+
+</BODY>
+</HTML>