From: Sarkis Varozian <firstname.lastname@example.org> To: Eric Wong <email@example.com> Cc: "Michael Fischer" <firstname.lastname@example.org>, unicorn-public <email@example.com>, "Bráulio Bhavamitra" <firstname.lastname@example.org> Subject: Re: Request Queueing after deploy + USR2 restart Date: Thu, 5 Mar 2015 09:07:39 -0800 [thread overview] Message-ID: <CAGchx-LV6q3Ku+3akpdmwVbWozJ2C3651616+PC5OXD-TUd5YQ@mail.gmail.com> (raw) In-Reply-To: <CAGchx-LEN7iLzJTEzY7pWgGA-KP9wQ6-YjCoVSdLrNhYXj0VnA@mail.gmail.com> Hey All, So I changed up my unicorn.rb a bit from my original post: https://gist.github.com/sarkis/1aa296044b1dfd3695ab I'm also still sending the USR2 signals on deploy staggered with 30 second delay via capistrano: on roles(:web), in: :sequence, wait: 30 As you can see I am now doing a warup via rack MockRequest (I hoped this would warmup the master). However, this is what a deploy looks like on newrelic: https://www.dropbox.com/s/beh7nc8npdfijqp/Screenshot%202015-03-05%2009.05.15.png?dl=0 https://www.dropbox.com/s/w08gpvp7mpik3vs/Screenshot%202015-03-05%2009.06.51.png?dl=0 I'm running out of ideas to get rid of thse latency spikes. Would you guys recommend I try anything else at this point? On Wed, Mar 4, 2015 at 12:40 PM, Sarkis Varozian <email@example.com> wrote: > Eric, > > Thanks for the quick reply. > > We are on Ruby 2.1.5p273 and unicorn 4.8.3. I believe our problem is the > lazy loading - at least thats what all signs point to. I am going to try > and mock request some url endpoints. Currently, I can only think of '/', as > most other parts of the app require a session and auth. I'll report back > with results. > > > > On Wed, Mar 4, 2015 at 12:35 PM, Eric Wong <firstname.lastname@example.org> wrote: > >> Sarkis Varozian <email@example.com> wrote: >> > On Wed, Mar 4, 2015 at 12:17 PM, Michael Fischer <firstname.lastname@example.org> >> > wrote: >> > >> > > I'm not exactly sure how preload_app works, but I suspect your app is >> > > lazy-loading a number of Ruby libraries while handling the first few >> > > requests that weren't automatically loaded during the preload process. >> > > >> > > Eric, your thoughts? >> >> (top-posting corrected) >> >> Yeah, preload_app won't help startup speed if much of the app is >> autoloaded. >> >> Sarkis: which Ruby version are you running? IIRC, 1.9.2 had terrible >> startup performance compared to 1.9.3 and later in case you're stuck on >> 1.9.2 >> >> > That does make sense - I was looking at another suggestion from a user >> here >> > (Braulio) of running a "warmup" using rack MockRequest: >> > https://gist.github.com/brauliobo/11298486#file-unicorn-conf-rb-L77 >> > >> > The only issue I am having with the above solution is it is happening in >> > the before_fork block - shouldn't I warmup the connection in after_fork? >> >> If preload_app is true, you can warmup in before_fork; otherwise it >> needs to be after_fork. >> >> > If >> > I follow the above gist properly it warms up the server with the old >> > activerecord base connection and then its turned off, then turned back >> on >> > in after_fork. I think I am not understanding the sequence of events >> > there... >> >> With preload_app and warmup, you need to ensure any stream connections >> (DB, memcached, redis, etc..) do not get shared between processes, so >> it's standard practice to disconnect in the parent and reconnect in the >> child. >> >> > If this is the case, I should warmup and also check/kill the old >> > master in the after_fork block after the new db, redis, neo4j >> connections >> > are all created. Thoughts? >> >> I've been leaving killing the master outside of the unicorn hooks >> and doing it as a separate step; seemed too fragile to do it in >> hooks from my perspective. >> > > > > -- > *Sarkis Varozian* > email@example.com > -- *Sarkis Varozian* firstname.lastname@example.org
next prev parent reply other threads:[~2015-03-05 17:07 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-03-03 22:24 Sarkis Varozian 2015-03-03 22:32 ` Michael Fischer 2015-03-04 19:48 ` Sarkis Varozian 2015-03-04 19:51 ` Michael Fischer 2015-03-04 19:58 ` Sarkis Varozian 2015-03-04 20:17 ` Michael Fischer 2015-03-04 20:24 ` Sarkis Varozian 2015-03-04 20:27 ` Michael Fischer 2015-03-04 20:35 ` Eric Wong 2015-03-04 20:40 ` Sarkis Varozian 2015-03-05 17:07 ` Sarkis Varozian [this message] 2015-03-05 17:13 ` Bráulio Bhavamitra 2015-03-05 17:28 ` Sarkis Varozian 2015-03-05 17:31 ` Bráulio Bhavamitra 2015-03-05 17:32 ` Bráulio Bhavamitra 2015-03-05 21:12 ` Eric Wong 2015-03-03 22:47 ` Bráulio Bhavamitra 2015-03-04 19:50 ` Sarkis Varozian [not found] ` <CAJri6_vidE15Xor4THzQB3uxyqPdApxHoyWp47NAG8m8TQuw0Q@mail.gmail.com> 2015-09-13 15:12 ` Bráulio Bhavamitra 2015-09-14 2:14 ` Eric Wong
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