09-11-2019
Now I recall some of the problems I used to have with mod_pagespeed......
mod_pagespeed give a tiny increase in page speed with the big cost of caching and when we make a change on the site and try to clear the cache, the cache does not clear propertly or correctly
and it is very hard to work on the site, debug things, etc. due to the caching of all this code and the problems trying to clear the various caches.
So, I turned it off (again) for now.
I tried to clear the cache and it will not clear easily but again, it may be because we have to clear the cache on both the server side and the client side; all of which is too much work.
As I always try to explain to people over the years; all the "optimizations" come at a "cost" and the major cost for mod_pagespeed is a cache of a written pages (HTML, CSS, Javascript) which can be very difficult to manage if you are making any changes to the code or debugging something; and I started making changes to the code based on the W3C validator; but it's hard to work on this with mod_pagespeed caching, rewriting code, etc.
Anyway, its off again ... because the pages load fast already and mod_pagespeed does not really help that much and has very little or nothing to do with the issue I posted about, which is:
Your site has been switched to Mobile First Indexing by Google.
Cheers!
This User Gave Thanks to Neo For This Post:
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LEARN ABOUT DEBIAN
cache::historical
Historical(3pm) User Contributed Perl Documentation Historical(3pm)
NAME
Cache::Historical - Cache historical values
SYNOPSIS
use Cache::Historical;
my $cache = Cache::Historical->new();
# Set a key's value on a specific date
$cache->set( $dt, $key, $value );
# Get a key's value on a specific date
my $value = $cache->get( $dt, $key );
# Same as 'get', but if we don't have a value at $dt, but we
# do have values for dates < $dt, return the previous
# historic value.
$cache->get_interpolated( $dt, $key );
DESCRIPTION
Cache::Historical caches historical values by key and date. If you have something like historical stock quotes, for example
2008-01-02 msft 35.22
2008-01-03 msft 35.37
2008-01-04 msft 34.38
2008-01-07 msft 34.61
then you can store them in Cache::Historical like
my $cache = Cache::Historical->new();
my $fmt = DateTime::Format::Strptime->new(
pattern => "%Y-%m-%d");
$cache->set( $fmt->parse_datetime("2008-01-02"), "msft", 35.22 );
$cache->set( $fmt->parse_datetime("2008-01-03"), "msft", 35.37 );
$cache->set( $fmt->parse_datetime("2008-01-04"), "msft", 34.38 );
$cache->set( $fmt->parse_datetime("2008-01-07"), "msft", 34.61 );
and retrieve them later by date:
my $dt = $fmt->parse_datetime("2008-01-03");
# Returns 35.37
my $value = $cache->get( $dt, "msft" );
Even if there's no value available for a given date, but there are historical values that predate the requested date, "get_interpolated()"
will return the next best historical value:
my $dt = $fmt->parse_datetime("2008-01-06");
# Returns undef, no value available for 2008-01-06
my $value = $cache->get( $dt, "msft" );
# Returns 34.48, the value for 2008-01-04, instead.
$value = $cache->get_interpolated( $dt, "msft" );
Methods
new()
Creates the object. Takes the SQLite file to put the date into as an additional parameter:
my $cache = Cache::Historical->new(
sqlite_file => "/tmp/mydata.dat",
);
The SQLite file defaults to
$HOME/.cache-historical/cache-historical.dat
so if you have multiple caches, you need to use different SQLite files.
time_range()
# List the time range for which we have values for $key
my($from, $to) = $cache->time_range( $key );
keys()
# List all keys
my @keys = $cache->keys();
values()
# List all the values we have for $key, sorted by date
# ([$dt, $value], [$dt, $value], ...)
my @results = $cache->values( $key );
clear()
# Remove all values for a specific key
$cache->clear( $key );
# Clear the entire cache
$cache->clear();
last_update()
# Return a DateTime object of the last update of a given key
my $when = $cache->last_update( $key );
since_last_update()
# Return a DateTime::Duration object since the time of the last
# update of a given key.
my $since = $cache->since_last_update( $key );
LEGALESE
Copyright 2007-2011 by Mike Schilli, all rights reserved. This program is free software, you can redistribute it and/or modify it under
the same terms as Perl itself.
AUTHOR
2007, Mike Schilli <cpan@perlmeister.com>
perl v5.10.1 2011-04-27 Historical(3pm)