On Wed, 27 Sep 2006 13:13:51 +0100
"Ben Wilder" wrote:

> My research so far has led me to believe that IPC::ShareLite could be
> used by the cron job script to set a few (very small) variables into
> a portion of shared memory, that a separate mod_perl application
> could poll. Mod_perl would not need to modify these variables, only
> read them.
> Would using a library such as IPC::ShareLite be considered a fudge
> for this type of action, is there some sort of global apache variable
> section that I can modify with one application and read out from
> another?
> Any thoughts appreciated!

Using one of the IPC modules is definitely a reasonable choice
based on what you're trying to do. But I wanted to throw out
some other options as some people find IPC hard to work with.

1. BerkeleyDB or sqlite. I realize you said you'd like to avoid a
database, but sometimes this means avoid installing a big
RDMS like PostgreSQL, MySQL, etc.

2. memcached and Cache::Memcached could store your data in
a memory cache for you.

3. Use can also use a simple config file with something like
Config::General. Your crons can update this data onto disk
and your mod_perl apps can simply read it in as a config file,
maybe using a short 5 minute cache to reduce disk reads.

4. You could also use Storable to drop an object full of your
small variables from your cron and have your mod_perl app
read them in on each request ( or a short cache in pnotes or
something ).

The last two may sound slow due to the disk reads, but it really
shouldn't cause a performance problem in all but the most
demanding environments.

Frank Wiles