Connections dropped under load

[George Georgovassilis]

Hello Stefan,

Thank you for the hint. Here are the values:

thread_pools = 2
thread_pool_min = 2
thread_pool_max = 200 (was 2 at the time of my initial tests)
thread_pool_add_delay = 2

Regards,
G.

On 11.01.2011 00:48, Caunter, Stefan wrote:
> Hi George,
>
> I assumed your management access is on port 6082. Adjust to your configured varnishd please.
>
> Thread creation and pool size monitoring is essential to handling traffic spikes. If load test exceeded the configured available maximums varnish will drop connections, cache hit or no.
>
> A thread is required to answer a network connection. You don't get something for nothing. Unless varnish has resources to get that cached object, it cannot do anything for your requesting clients, real or test.
>
> Sent from my iPhone
>
> On 2011-01-10, at 15:55, "George Georgovassilis"<g.georgovassilis at gmail.com>  wrote:
>
>> Hello Stefan,
>>
>> For every of the commands you quoted I'm getting an
>>
>> connect(): Invalid argument
>> Connection failed
>>
>>
>> Why are threads relevant? As I wrote earlier, everything is answered from within the varnish cache - I thought the entire epolling parade was about avoiding caches.
>> I published the threadsettings earlier in this discussion.
>>
>> Regards,
>> G.
>>
>> On 10.01.2011 19:50, Caunter, Stefan wrote:
>>> Yes, and I also don't understand why there is no discussion of threads
>>> here. If we can see
>>>
>>> varnishadm -T 6082 param.show thread_pools
>>> varnishadm -T 6082 param.show thread_pool_min
>>> varnishadm -T 6082 param.show thread_pool_max
>>> varnishadm -T 6082 param.show thread_pool_add_delay
>>>
>>> it would be helpful.
>>>
>>> The only time I've seen varnish drop connections is when it cannot
>>> create threads quickly enough, or has insufficient resources to do so.
>>>
>>> Stefan Caunter
>>> e: scaunter at topscms.com  ::  m: (416) 561-4871
>>> www.thestar.com
>>>
>>>
>>> -----Original Message-----
>>> From: varnish-misc-bounces at varnish-cache.org
>>> [mailto:varnish-misc-bounces at varnish-cache.org] On Behalf Of Kristian
>>> Lyngstol
>>> Sent: January-06-11 4:00 AM
>>> To: George Georgovassilis
>>> Cc: varnish-misc at varnish-cache.org
>>> Subject: Re: Connections dropped under load
>>>
>>> Hi,
>>>
>>> On Wed, Jan 05, 2011 at 04:20:31PM +0100, George Georgovassilis wrote:
>>>> I'm having trouble with dropped connections under a loadtest.
>>> We need:
>>>
>>> varnishstat -1
>>>
>>> Any further discussion without varnishstat -1 output is wild guesswork
>>> and
>>> superstition.
>>>
>>> - Kristian
>>>
>>> _______________________________________________
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>>> varnish-misc at varnish-cache.org
>>> http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>>
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