60 lines
2.1 KiB
HTML
60 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>-slp (Set Large Pages mode) switch</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>-slp (Set Large Pages mode) switch</H1>
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<P>Sets Large Pages mode.</P>
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<H4>Syntax</H4>
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<PRE class="syntax">
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-slp[-]
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</PRE>
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<TABLE>
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<TR><TH width="80">Switch</TH> <TH>Description</TH></TR>
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<TR><TD>-slp</TD> <TD>Enables Large Pages mode.</TD></TR>
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<TR><TD>-slp-</TD> <TD>Disables Large Pages mode. This option is default for all commands.</TD></TR>
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</TABLE>
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<P> Large Pages mode increases the speed of compression.
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However, there is a pause at the start of compression while 7-Zip allocates the large pages in memory.
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If 7-Zip can't allocate large pages, it allocates usual small pages.
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Also, the Windows Task Manager doesn't show the real memory usage of the program, if 7-Zip uses large pages.
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This feature works only on Windows 2003 / XP x64.
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Also, it requires administrator's rights for your system.
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The recommended size of RAM for this feature is 3 GB or more.
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To install this feature, you must run the 7-Zip File Manager at least once,
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close it, and then reboot the system. </P>
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<P> <B>Notes: if you use -slp mode, your Windows system can hang for several
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seconds when 7-zip allocates memory blocks</B>.
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When Windows tries to allocate large pages from RAM for 7-Zip, Windows can hang other tasks for that time.
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It can look like full system hang, but then it resumes, and if allocation is successful, 7-Zip works faster.
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Don't use -slp mode, if you don't want other tasks be hanged for several seconds.
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Also it's senseless to use -slp mode to compress small data sets (less than 100 MB).
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But if you compress big data sets (300 MB or more) with LZMA method with large dictionary,
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you can get 5%-10% speed improvement with -slp mode.</P>
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<H4>Example</H4>
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<PRE class="example">
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7z a archive.7z -slp a.iso
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</PRE>
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<P>compresses <SPAN class="filename">a.iso</SPAN> file with Large Pages mode switched on.</P>
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</BODY>
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</HTML>
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