On Nov 16, 2010, at 2:09 AM, Marius Mårnes Mathiesen wrote:
On Mon, Nov 15, 2010 at 3:42 PM, Michael Jackson imikejack...@gmail.com
wrote:
I have a public facing Gitorious installation for use by our teams.
It is currently running on some pretty modest hardware (single core
3.0 GHZ processor). For each page load there seems to be a large
delay (about 10 seconds) on the first few page views in the morning
then things seem to speed up a bit after that. Even pushing there is
a noticeable delay from when the SSH connection occurs to when the
pushing begins. I am looking at a hardware sever upgrade and would
like to know what the best bang for the buck would be? More CPU
Cores? More clock speed? RAID Disks? Memory does not seem to be an
issue. I have 3GB in the server and always have 1.5 of that free. My
own thinking is that having more cores (Quad Core I5) would be
better so that all the processes can better share the CPU resources?
Mike,
It sounds like Passenger puts your Gitorious processes to sleep
after some inactivity, and that the wait time is due to Passenger
starting up new Rails processes when you connect. This would happen
whenever you push too, since the SSH service (or rather the hooks
called when pushing) connect to the local server when clients
connect. Faster disks should also give a good performance gain.
top should give you some hard numbers to indicate the load on your
CPU, but in general I think IO is what slows down a busy Gitorious
server (Git is really heavy on IO). If the response time is bad also
after the initial warm-up time, scaling the server could be
something to look into.
The best place to start is probably to configure Passenger to keep
around a few Rails processes, the documentation at http://modrails.com/documentation.html
should explain how to set this up.
Cheers,
- Marius
Just to (finally) follow up on this I was able get back to this and
try a few things. In order to have Passenger have a few instances
always available you need to be running at least version 3.0 of
Passenger. I was not. So after installing Passenger 3.0.2 I had
passenger has 2 instances available and to auto start at least 1 when
apache starts. The response time has gone way down is like I am on a
new server. The current hardware only supports a RAID 5 configuration
which defeats the thought of adding a RAID-0 Stripe to run the system
off of. However since this is a fairly small server I have toyed with
the idea of installing a small SSD into the system instead. I recently
put one into my main workstation and the difference on I/O intensive
programs (like compiling software) is amazing. Since Gitorious seems
to be I/O dependent (mostly) I am thinking this may solve the
remaining latency issues.
Thanks again for all the great work.
--
Mike Jackson
Principal Software Engineer
BlueQuartz Software - www.bluequartz.net
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