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author | kh1 <karsten.heimrich@nokia.com> | 2012-03-15 14:53:47 +0100 |
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committer | Karsten Heimrich <karsten.heimrich@nokia.com> | 2012-03-19 16:14:04 +0100 |
commit | be3b47d0d504a3409ce66bd77bb8c0acff87c4f5 (patch) | |
tree | 09dfb02d484a4f395991972b828da71400fb761a /src/libs/7zip/unix/DOCS/MANUAL/commands/bench.htm | |
parent | 9fd62353cf7f973d78cd2093328ac15b5c4980b6 (diff) |
Reorganize the tree, have better ifw.pri. Shadow build support.
Change-Id: I01fb12537f863ed0744979973c7e4153889cc5cb
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>
Diffstat (limited to 'src/libs/7zip/unix/DOCS/MANUAL/commands/bench.htm')
-rw-r--r-- | src/libs/7zip/unix/DOCS/MANUAL/commands/bench.htm | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/libs/7zip/unix/DOCS/MANUAL/commands/bench.htm b/src/libs/7zip/unix/DOCS/MANUAL/commands/bench.htm new file mode 100644 index 000000000..14f456cd3 --- /dev/null +++ b/src/libs/7zip/unix/DOCS/MANUAL/commands/bench.htm @@ -0,0 +1,79 @@ +<!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> |