* Multiple master processes
@ 2011-01-31 9:47 Tilmann Singer
2011-01-31 18:08 ` Eric Wong
2011-01-31 19:24 ` Jamie Wilkinson
0 siblings, 2 replies; 5+ messages in thread
From: Tilmann Singer @ 2011-01-31 9:47 UTC (permalink / raw)
To: mongrel-unicorn
Hi,
I'm seeing the following output of ps after starting unicorn, which as
I understand it means that there are multiple master processes
running, each with its own pid. Is that normal behaviour or is there
something wrong with my setup?
$ ps xf|grep 4002
8022 ? S 0:00 unicorn master -c config/unicorn.rb -E production -p 4002 -D
8024 ? S 0:00 \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
26743 ? S 0:00 | \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
26734 ? S 0:22 \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
26736 ? S 0:00 | \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
26739 ? S 0:00 | \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
26737 ? S 0:22 \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
26740 ? S 0:00 | \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
26741 ? S 0:00 | \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
26742 ? S 0:21 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
26744 ? S 0:00 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
26745 ? S 0:00 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
$ cat tmp/pids/unicorn.pid
8022
This is on Linux 2.4.27, ruby 1.9.2, unicorn 3.3.1, rails 3.0.3 in an
rvm gemset.
# config/unicorn.rb
worker_processes 3
pid "tmp/pids/unicorn.pid"
stderr_path "log/unicorn.stderr.log"
stdout_path "log/unicorn.stdout.log"
I start unicorn like this:
unicorn -c config/unicorn.rb -E production -p 4002 -D
Using "bundle exec unicorn" or unicorn_rails instead doesn't seem to
make a difference.
Starting the same project on my desktop with I believe is mostly the
same setup except that it is Linux 2.6.34, the process list looks like
this, which looks normal to me:
$ ps xf|grep 4002
2692 ? Sl 0:00 unicorn master -c config/unicorn.rb -E production -p 4002 -D
2695 ? Rl 0:05 \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
2698 ? Rl 0:05 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
2700 ? Rl 0:05 \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
Til
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* Re: Multiple master processes
2011-01-31 9:47 Multiple master processes Tilmann Singer
@ 2011-01-31 18:08 ` Eric Wong
2011-02-01 20:48 ` Tilmann Singer
2011-01-31 19:24 ` Jamie Wilkinson
1 sibling, 1 reply; 5+ messages in thread
From: Eric Wong @ 2011-01-31 18:08 UTC (permalink / raw)
To: unicorn list
Tilmann Singer <tils@tils.net> wrote:
> Hi,
>
> I'm seeing the following output of ps after starting unicorn, which as
> I understand it means that there are multiple master processes
> running, each with its own pid. Is that normal behaviour or is there
> something wrong with my setup?
It's normal behavior for Linux 2.4.x + Ruby 1.9, don't worry about it.
> $ ps xf|grep 4002
> 8022 ? S 0:00 unicorn master -c config/unicorn.rb -E production -p 4002 -D
> 8024 ? S 0:00 \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
> 26743 ? S 0:00 | \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
> 26734 ? S 0:22 \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
> 26736 ? S 0:00 | \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
> 26739 ? S 0:00 | \_ unicorn worker[0] -c config/unicorn.rb -E production -p 4002 -D
> 26737 ? S 0:22 \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
> 26740 ? S 0:00 | \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
> 26741 ? S 0:00 | \_ unicorn worker[2] -c config/unicorn.rb -E production -p 4002 -D
> 26742 ? S 0:21 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
> 26744 ? S 0:00 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
> 26745 ? S 0:00 \_ unicorn worker[1] -c config/unicorn.rb -E production -p 4002 -D
> $ cat tmp/pids/unicorn.pid
> 8022
>
> This is on Linux 2.4.27, ruby 1.9.2
With LinuxThreads in 2.4, the native threads used by Ruby 1.9 each had a
unique PID and /proc entry whereas with NPTL in 2.6 hides the top-level
entries of tasks that weren't processes (still visible in
/proc/$pid/task/*)
"tasks" are just the in-kernel representation of either processes and
native threads in all Linux versions. They're created via the same
system call, clone(2), so pthread_create() and fork() are just wrappers
around clone() with different arguments. It's just 2.4 had fewer
options for clone() that made it weirder and less POSIX-conformant.
The pthreads(7) manpage has more details on the differences between NPTL
and LinuxThreads.
Wow, I didn't realize people ran the latest Rubies on 2.4.x!
--
Eric Wong
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* Re: Multiple master processes
2011-01-31 18:08 ` Eric Wong
@ 2011-02-01 20:48 ` Tilmann Singer
2011-02-01 21:22 ` Eric Wong
0 siblings, 1 reply; 5+ messages in thread
From: Tilmann Singer @ 2011-02-01 20:48 UTC (permalink / raw)
To: unicorn list
At Mon, 31 Jan 2011 18:08:15 +0000,
Eric Wong <normalperson@yhbt.net> wrote:
>
> Tilmann Singer <tils@tils.net> wrote:
> > I'm seeing the following output of ps after starting unicorn, which as
> > I understand it means that there are multiple master processes
> > running, each with its own pid. Is that normal behaviour or is there
> > something wrong with my setup?
>
> It's normal behavior for Linux 2.4.x + Ruby 1.9, don't worry about it.
OK thanks, good to know.
> > $ ps xf|grep 4002
> > 8022 ? S 0:00 unicorn master -c config/unicorn.rb -E production -p 4002 -D
> > 8024 ? S 0:00 \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
> > 26743 ? S 0:00 | \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
[...]
> > $ cat tmp/pids/unicorn.pid
> > 8022
Could it be that the content of the pidfile is wrong in this case? I
found that I always have to signal the pid of the last of the master
process list entries (26743 in this example) to see them have an
effect. Not a big deal, just wondering.
> Wow, I didn't realize people ran the latest Rubies on 2.4.x!
Time to upgrade for me I assume ...
greetings, Til
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* Re: Multiple master processes
2011-02-01 20:48 ` Tilmann Singer
@ 2011-02-01 21:22 ` Eric Wong
0 siblings, 0 replies; 5+ messages in thread
From: Eric Wong @ 2011-02-01 21:22 UTC (permalink / raw)
To: unicorn list
Tilmann Singer <tils@tils.net> wrote:
> > > $ ps xf|grep 4002
> > > 8022 ? S 0:00 unicorn master -c config/unicorn.rb -E production -p 4002 -D
> > > 8024 ? S 0:00 \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
> > > 26743 ? S 0:00 | \_ unicorn master -c config/unicorn.rb -E production -p 4002 -D
> [...]
> > > $ cat tmp/pids/unicorn.pid
> > > 8022
>
> Could it be that the content of the pidfile is wrong in this case? I
> found that I always have to signal the pid of the last of the master
> process list entries (26743 in this example) to see them have an
> effect. Not a big deal, just wondering.
Probably, I don't think there's a reliable way to get the pid
dedicated to signal handling with LinuxThreads...
> > Wow, I didn't realize people ran the latest Rubies on 2.4.x!
>
> Time to upgrade for me I assume ...
Definitely, especially since you're using Ruby 1.9.2 :)
--
Eric Wong
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* Re: Multiple master processes
2011-01-31 9:47 Multiple master processes Tilmann Singer
2011-01-31 18:08 ` Eric Wong
@ 2011-01-31 19:24 ` Jamie Wilkinson
1 sibling, 0 replies; 5+ messages in thread
From: Jamie Wilkinson @ 2011-01-31 19:24 UTC (permalink / raw)
To: unicorn list
On Jan 31, 2011, at 1:47 AM, Tilmann Singer wrote:
> Hi,
>
> I'm seeing the following output of ps after starting unicorn, which as
> I understand it means that there are multiple master processes
> running, each with its own pid. Is that normal behaviour or is there
> something wrong with my setup?
>
<snip>
> # config/unicorn.rb
> worker_processes 3
> pid "tmp/pids/unicorn.pid"
> stderr_path "log/unicorn.stderr.log"
> stdout_path "log/unicorn.stdout.log"
Unicorn doesn't kill the old master on it's own, you need an after_fork() like so (from the default/suggested unicorn conf)
http://unicorn.bogomips.org/examples/unicorn.conf.rb
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end of thread, other threads:[~2011-02-01 21:26 UTC | newest]
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2011-01-31 9:47 Multiple master processes Tilmann Singer
2011-01-31 18:08 ` Eric Wong
2011-02-01 20:48 ` Tilmann Singer
2011-02-01 21:22 ` Eric Wong
2011-01-31 19:24 ` Jamie Wilkinson
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