Ah so, Well lets just put down everything.

[root@perlbox sandbox]# ls
file1.pl  file2.pl  memory
[root@perlbox sandbox]# cat memory
XXXXXXXXXXXXXxxxxXxXXXXXXX


[root@perlbox sandbox]# cat file1.pl
 use File::Map qw/:map lock_map sync/;
 use warnings;
 use strict;

 my $mmap = undef;
 my $file = "memory";

 map_file $mmap, $file, '+<';
  if (!defined($mmap)) { print "ERROR!!\n"; }
        for(my $i=0;$i<10000;++$i) { $mmap = $i; sync($mmap,1); }
 unmap ($mmap);
[root@perlbox sandbox]# perl file1.pl
[root@perlbox sandbox]# cat memory
XXXXXXXXXXXXXxxxxXxXXXXXXX


[root@perlbox sandbox]#

[download]

So as you see it doesn't write to the memory file, while I would have guessed it would have write down some numbers, Since of..


 use File::Map qw/:map lock_map sync/;
 use warnings;
 use strict;

 my $mmap = undef;
 my $file = "memory";

 map_file $mmap, $file, '+<';
  if (!defined($mmap)) { print "ERROR!!\n"; }
        for(my $i=0;$i<10000;++$i) { <b>$mmap = $i;</b> sync($mmap,1);
+ }
 unmap ($mmap);

[download]

the Bold code.
Already thanks a lot. Is this the information required?

In reply to Re^4: mmap in Perl? by RobinV
in thread mmap in Perl? by RobinV

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.