I don't think so. Jetty is also multi-threaded; each request will be served
by a new thread (within a bounded thread pool). Secondly, processor
affinity is almost always a bad idea; the OS is pretty good at doing this
for you.
At the very least I would have a test harness which measures the behaviour
of the application under heavy concurrent access - I would be amazed if you
any benefit from your approach. I wouldn't be surprised at all if it
becomes much worse - sorry :).
Note; I am not a performance specialist and even if I claimed to be one you
should always take advice with a pinch of salt. It should be fairly easy to
measure the difference between the two deployment models yourself.
Sorry.
On 20 October 2011 19:41, Tim Robinson tim.blacks...@gmail.com wrote:
This may not be a Clojure specific kind of question, but this is for
my Clojure web app(s) so hopefully it's not too far off.
Currently when I deploy my web apps I run 1 app instance on 1 app
server. Given these are multi-core servers I am thinking about running
4 app instances on a server to get max IO capabilities at a lower
cost. (Note that I currently using nginx, to route requests to a
Clojure/Ring+Jetty web app on a specified port. I am expecting that in
order to run 4 app instances I will need to load balance within nginx
to each port and also set the processor affinity for each app instance
to ensure they are balanced across cores).
So here are my questions:
1. Does this idea make sense? why/whynot?
2. Do you do currently do this for your web apps and can you provide
any insight/experiences that could be helpful?
3. Is there a way to specify processor affinity within the
application, such that I wouldn't need to manually set them
afterwards?
4. Are there better ideas to accomplish the same kind of thing?
Thanks for any help/ideas.
Tim
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