On Wed, 9 May 2001, Morbus Iff wrote:
> I'm relatively new to mod_perl... I've got a 700k file that is loaded each
> time I run a CGI script, so I'm hoping to cache the file using mod_perl
> somehow. The file will change occasionally (maybe once a week) - the reload
> of a few seconds isn't worrisome, but it has to be done without restarting
> the server.
[...]
> ** The 700k file is an XML file, read in by XML::Simple. XML::Simple can
> cache that file into memory. Is this how I should do it? Or should I load
> the file from my startup.pl script so that the file is shared amongst all
> the apache children?
As others have pointed out it'll only be shared until you reload it
so I wouldn't worry about it.
Things I would try:
1) Have an external process parse the XML::Simple into the
datastructure you need and save it with Storable::nfreeze.
Then the apache processes can load it with thaw which should
be much faster and might very well use less memory than the
XML::Simple foo.
For checking for updates something like
my $last_reload = 0;
my $last_check = 0;
sub handler {
reload_data() if time >= $last_check+3600; # check every hour
[...]
}
sub reload_data {
$last_check = time;
return unless (stat "/home/foo/data/datafile")[9] > $last_reload;
# load data
$last_load = time;
}
2) Save the data in a BerkeleyDB 3 database (which can be
shared) and have an external process just load the data into
it. Update will "just work".
- ask
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