Server IP : 85.214.239.14 / Your IP : 18.223.239.65 Web Server : Apache/2.4.62 (Debian) System : Linux h2886529.stratoserver.net 4.9.0 #1 SMP Tue Jan 9 19:45:01 MSK 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.18 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, MySQL : OFF | cURL : OFF | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : OFF Directory : /proc/2/cwd/usr/share/doc/p7zip-full/DOC/MANUAL/cmdline/commands/ |
Upload File : |
<!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> <P>With -mm=* switch you can run a complex benchmark. It tests hash calculation methods, compression and encryption codecs of 7-Zip. Note that the tests of LZMA have big weight in "total" results. And the results are normilized with AMD K8 cpu in complex benchmark.</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> <PRE class="example"> 7z b -mm=* </PRE> <P>runs complex 7-Zip benchmark.</P> </BODY> </HTML>