Skip to content

V
varnish-cache
Switch branch/tag
  1. 15 Jun, 2008 25 commits
  3. 14 Jun, 2008 2 commits
  5. 11 Jun, 2008 2 commits
    • Poul-Henning Kamp's avatar
      Add an optional shortcut: · de2fd54b
      Poul-Henning Kamp authored 
      The parameter session_linger determines how many milliseconds the
workerthread waits to see if another request has arrived, before
handing the session over to the session herder.

If we manage to catch the next request this way, we save a number
of semi-expensive steps, if we hang around too long, the worker-thread
gets to goof off.

A relatively small sample of data from a live server, indicates
that 20% of all requests arrive within 50 msec of the previous
request and 50% within 100msec.

It is not clear at present how these timeintervals relate to client
RTT, or if they are systematically too high, due to the duration
of the detour over the herder.

There is a new line in varnishstat keeping track of how many times
this gamble succeeds.

Experimentation is encouraged.




git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2663 d4fa192b-c00b-0410-8231-f00ffab90ce4
      de2fd54b
    • Poul-Henning Kamp's avatar
      Be a little less hysteric with charging session statistics to · 994cde5a
      Poul-Henning Kamp authored 
      srcaddr and global counters.


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2662 d4fa192b-c00b-0410-8231-f00ffab90ce4
      994cde5a
  7. 10 Jun, 2008 2 commits
  9. 09 Jun, 2008 5 commits
  11. 08 Jun, 2008 1 commit
  13. 07 Jun, 2008 1 commit
    • Poul-Henning Kamp's avatar
      Redo the way we manage the thread pool(s). · ea859f03
      Poul-Henning Kamp authored 
      This is necessary to generalize the thread pools to do other tasks
for us in the future.

Please read the descriptions of the new and changed thread_pool*
parameters carefully before you tweak them, some of them have
slightly different meanings now.

The high-level view of this is that we now have dedicated a thread to
adding threads to the pools, in addition to the thread we already
had that killed idle threads from the pools.

The difference is that this new thread is quite a bit more reluctant
to add threads than the previous code, which would add a thread any
time it could get away with it.

Hopefully that reduces the tendency for thread-pile-ups.

This commit also reduces the cross-pool locking contention by making
the overflow queue a per pool item.

The down side of that is that more of the stats counters have become
unlocked and thus can get out of sync if two threads race when updating
them.  This is an XXX item.

Thanks to Anders Nordby for testing this patch.




git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2653 d4fa192b-c00b-0410-8231-f00ffab90ce4
      ea859f03
  15. 06 Jun, 2008 2 commits