Load Testing Help - how to improve perfromance

Cantor, Scott cantor.2 at osu.edu
Tue Nov 11 12:52:11 EST 2014

On 11/11/14, 4:17 PM, "Baptista, Paulo" <paulo_baptista at brown.edu> wrote:

>How are all of you?  We're running some load tests against our QA Shib 
>IDP Infrastructure.  I'd like to share our current setup and results, and 
>hopefully get from the community some tips on how to improve performance.

First you have to figure out the bottleneck and then determine if it's 
fixable. Chances are it's not, and you simply need more capacity. If it's 
CPU bound, then you need more CPU, that's it. It scales linearly.

>2 Red Hat servers, IDP load balanced behind F5
>each with 2CPU, 2.5Ghz
>8GB ram
>java 1.6.0_14
>-Xms256m -Xmx6g -XX:MaxPermSize=1g -XX:-DisableExplicitGC 

Java 1.6 is dead, so I'd start by using one that isn't, since it's newer 
and might have performance improvements anyway.

>We're running load test with 1000 concurrent users for 5 minutes. We get 
>about 4000 successful logins. We're using Jmeter.

I seriously doubt that's a realistic load, but if you think you need that 
and it's CPU bound, then I guess you need more cores. Pretty simple. If 
it's not CPU bound, then the IdP isn't the bottleneck.

-- Scott

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