in reply to Re: gigantic daemons
in thread gigantic daemons

Thanks for the information. I gather that only one copy of perl is actually loaded, am I right?

Running on Linux -- check
Same server (well, same host) -- check
Same parent -- check
Same data -- Well, not exactly, but the amount of data these daemons use is small.

I am not loading entire web pages, I am only doing HEAD requests, and one-at-a-time at that. The data storage is on a PostgreSQL server. Could it be I am misleading myself about actual memory comsumption? I am looking at "ps -aux" and "gnome-system-monitor". Is the memory shown perhaps actually not physically allocated (or swapped, maybe?).

Replies are listed 'Best First'.
Re: Re: Re: gigantic daemons
by esh (Pilgrim) on Sep 03, 2003 at 06:50 UTC

    I gather that only one copy of perl is actually loaded, am I right?
    Yes, one copy of the perl compiler/interpreter and probably one copy of your Perl source code (unless you "require", "do", or other similar things at run time).

    Could it be I am misleading myself about actual memory comsumption?
    Yes, it is possible that most of the parent/child memory listed by ps is shared amongst them.

    I tend to use the "top" command to watch the shared memory usage. It seems that ps should have an option to show shared memory, but I couldn't get it to work right off.

    What really matters is how much free memory you have on the system when everything is running. Try a before and after snapshot using something like "free" and make sure to look at the free momory +/- buffers/cache.

    -- Eric Hammond

[reply]
      Thanks, Eric. I seem to get similar results with "free" and "top". I do, indeed, "use" several modules in the daemons, which must explain why they aren't shared as I think they should be. (Even so, 5.6MB seems excessive...). Thanks very much for the help.
[reply]
        use does its magic at compile time. If the daemons are loaded before the fork, then they should be shared. Well, as much as the main script, anyway.
[reply]

In Section Seekers of Perl Wisdom