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From: "Jérémy Lecour" <jeremy.lecour@gmail.com>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: Number of worker processes on hyperthreaded processor
Date: Sat, 19 Jan 2013 23:57:48 +0100	[thread overview]
Message-ID: <CANrRGgqSND5+fs7LtX6c5K2ADVtsx-cxEYjcg2vi3-bepjXVpA@mail.gmail.com> (raw)
In-Reply-To: <20121119112350.GA31468@dcvr.yhbt.net>

2012/11/19 Eric Wong <normalperson@yhbt.net>:
> Andrew Stewart <boss@airbladesoftware.com> wrote:
>> Good morning,
>>
>> The tuning page says worker_processes should be at least the number of
>> CPU cores on a dedicated server.  In the case of hyper-threading,
>> should this be the number of cores or the number of threads?
>>
>> For example the Intel Core i7-2600 Quadcore[1] has 4 cores and 8
>> threads.  Would I start my worker_processes at 4 or 8?
>
> I'd start with the number of threads, since (AFAIK) your CPU implements
> HT well (unlike the P4 family).  Modern OSes multitask well, so more
> worker processes will always work until it bumps into another limit
> (e.g. memory usage, DB connections, disk contention, ...)

Hi (in plain text this time, sorry),

I have a follow up question about this.

What about having a few different unicorns (1 for each Ruby/Rails app)
on a singe server ; "at least the number of CPU cores" should count
the total number of children processes, or only per app ?

To be extremely clear ; if I have 2 quad-core CPUS with HT (eg. 16
cores), can I have 16 unicorn workers per app, or total ?

Thanks


PS : I've had my first unicorns in production for a few days, and I'm
very happy about this wonderful piece of software. Thanks for
making/maintaining it.


--
Jérémy Lecour :
http://jeremy.wordpress.com - http://twitter.com/jlecour
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      parent reply	other threads:[~2013-01-19 23:03 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-19 10:17 Number of worker processes on hyperthreaded processor Andrew Stewart
2012-11-19 11:23 ` Eric Wong
2012-11-19 11:54   ` Andrew Stewart
2013-01-19 22:57   ` Jérémy Lecour [this message]

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