Re: Why do some sites use a container for the Jenkins server?

[Stephen Connolly]

Most likely your JVM heap needs some tuning... you want the average heap
utilisation to be ~30-60% of the -Xmx (and set the -Xms to the same as -Xmx)

On a 8Gb ram machine default ergonomics in the JVM probably are putting the
heap max at 1G or 2G... my analysis of memory usage patterns suggest that
4g is a better start point for most people... then measure average heap
usage (using visualvm or jconsole) and tune the heap up or down from there
to get average at 30-60% of max.

Tomcat is a servlet container *just like* the embedded Jetty servlet
container that you get when you run the war file directly,

There is no advantage in using tomcat and the only reason is if you have a
corporate mandate or want to run another war based app along side... the
problem with that is it makes tuning a single JVM for the needs of multiple
apps very difficult.

* Stick with the embedded Jetty.

* Ensure you are not storing files on spinning rust. SSD is your friend for
the Jenkins master file system

* Do not run builds on the master. They will steal CPU cycles. use
remote build agents... plus it's more secure.

* Tune your JVM heap size... do not go mad. The defaults are mostly ok. You
just need to: set -Xmx to the same value as -Xms; and ensure that average
heap utilisation is between 30 and 60% of the allocated value... if less
than 30% then you are wasting CPU managing too big a pool, take memory away
from the JVM. If more than 60% then you are wasting CPU on GC, give it more
memory

On Tuesday 27 September 2016, Richard Otter  wrote:

> I'm untrained in web technology, so please read between the lines ...
>
> Our site uses the built-in web server in the Jenkins.war file, (still at
> v1.651.3)
>
> For years, we've been unhappy with the web interface's responsiveness when
> opening Job links. Moving around in the non-Job pages, like Manage
> Jenkins,nodes etc., is fast.
> The server machine certainly uses lots of RAM (4 GB out of 8), but it's
> CPU utilization seems usually to be low.
>
> Would running Jenkins in a "container" like TomCat help us?
>
> Why do people use apps like TomCat?
>
> Thanks!
> Richard
>
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Why do some sites use a container for the Jenkins server?

[Richard Otter]

I'm untrained in web technology, so please read between the lines ...

Our site uses the built-in web server in the Jenkins.war file, (still at
v1.651.3)

For years, we've been unhappy with the web interface's responsiveness when
opening Job links. Moving around in the non-Job pages, like Manage
Jenkins,nodes etc., is fast.
The server machine certainly uses lots of RAM (4 GB out of 8), but it's CPU
utilization seems usually to be low.

Would running Jenkins in a "container" like TomCat help us?

Why do people use apps like TomCat?

Thanks!
Richard

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