Hi i have a site that is relatively high loaded (~200000 reloads/sec) and i am
trying to optimize it.
So i have started timing sections of the php scripts to find out which is the
slowest so i optimize it first. I write the times to a database( timings are
done on the live server). So now when a user reloads the page (timings are set
on only one of the pages) i write to the database how long it took and how long
different sections take. That way i noticed thar occasionally that page takes
extremely long to generate (there are occasions of > 300sec), but generally it
takes between 0.05 and 0.2 sec to generate. I started moving the sections to
determine where the problem lies and it turned out that these three lines take
that long from time to time:
ini_set("session.gc_maxlifetime", "2400");
session_name('xxxxx');
session_start();
I measured each of them and seems that session_start is the problem(had a few
~11 sec loads, but not something this big yet, of which ~10.5 is taking
session_start)
Does anyone know what is going on? Sessions are stored in /tmp/sessions/ which
is 100MB ram drive and at the moment when this occurs it was ~68% used with
~12000 files in it.
And i have one more question. How does apache handle high loads? Does it
suspend the php script when there are no resources and resume it when it frees
some, or it doesn't pick it up at all?
Thank you
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