al jo wrote:
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.
My suggestion is check the php source for what session_start does. Maybe
it scans the directory to make sure it's going to generate a unique id
and even though it's on a ram drive it's taking a while because of the
number of files already there.
That's just a completely wild guess though ;)
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