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Update man page
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kimwalisch committed Dec 2, 2022
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.\" Title: primesieve
.\" Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 08/22/2022
.\" Date: 12/02/2022
.\" Manual: \ \&
.\" Source: \ \&
.\" Language: English
.\"
.TH "PRIMESIEVE" "1" "08/22/2022" "\ \&" "\ \&"
.TH "PRIMESIEVE" "1" "12/02/2022" "\ \&" "\ \&"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
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.PP
\fB\-s, \-\-size\fR=\fISIZE\fR
.RS 4
Set the size of the sieve array in KiB, 8 <=
Set the size of the sieve array in KiB, 16 <=
\fISIZE\fR
<= 8192\&. By default primesieve uses a sieve size that matches your CPU\(cqs L1 cache size (per core) or is slightly smaller than your CPU\(cqs L2 cache size\&. This setting is crucial for performance, on exotic CPUs primesieve sometimes fails to determine the CPU\(cqs cache sizes which usually causes a big slowdown\&. In this case you can get a significant speedup by manually setting the sieve size to your CPU\(cqs L1 or L2 cache size (per core)\&.
.RE
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