Varnish threads growing until no response

[Michael Dosser]

Hi,

> Am 27.07.2016 um 16:34 schrieb Michael Dosser <mic at strg.at>:

[...]

>> Can you set thread_pool_add_delay to 0 and let us know how it goes?
> 
> I’ve set it to 0 and will let you know if this solves the problem, thx!

unfortunately this setting did not fix the problem. Again the Thread-Count did rise up very fast (within 30 seconds +40 threads). Varnish is restarted by a script before we hit 2000 threads and the script dumps varnishstat -1. At that time:

MAIN.threads                    441          .   Total number of threads
MAIN.threads_created            441         0.00 Threads created
MAIN.sess_queued                439         0.00 Sessions queued for thread

sess_queued is normally 0 … only during the „pike“ it rises up.

It seems something is blocking. How can I debug this further?

Thx,
Michael Dosser

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