Check your web server logs to verify that the loads are getting equally distributed between the 2 servers. Also the diff between the 2 modes is that first u had direct access to the 2 servers, but now u r going thu an extra hop on the LB. This extra hop will also add to the latency. Try this. Target ws1 directly with 600 hits, and target ws1 again with 600 hits but this time thru the lb. See how much latency the lb adds. Sent on my BlackBerry® from Vodafone
-----Original Message----- From: William Ottley <[email protected]> Date: Sun, 4 Jul 2010 14:16:53 To: JMeter Users List<[email protected]> Reply-To: "JMeter Users List" <[email protected]> Subject: Re: simulate test as a LB, with 2 webservers at one time Your right. When I test the LB: 600 users, with 3 httpdclient urls. I test this to see if I get "close" to the same latency, as 2 web servers getting 300 users each with 3 httpdclient urls. I don't. I get 2x the latency, or the same latency as when I send 600 users with 3 urls to 1 webserver. So I'm trying to find where the problem is. Sent from my iPhone On 2010-07-04, at 1:57 PM, "Sudip Kumar Bhattacharya" <[email protected] > wrote: > If you are using a load balancer it wud normally front end on all > requests. > You wud not have to generate different urls on jmeter to reach > different servers as your mail suggests. > Having said that. Load balancers also have stickiness rules which > send consecutive requests from the same session or same ip to the > same web server for maintaining session data continuity. > You may not get an equally distributed load balancing between the > two servers. > Chen out your particular LB algorithm setting to get a better idea. > Sent on my BlackBerry® from Vodafone > > -----Original Message----- > From: William Ottley <[email protected]> > Date: Sun, 4 Jul 2010 13:47:59 > To: <[email protected]> > Reply-To: "JMeter Users List" <[email protected]> > Subject: simulate test as a LB, with 2 webservers at one time > > Hi all, > > I'm trying to solve an issue with regards to latency and Load > Balancing. > > I have done several latency tests using jmeter. > I have tested each of the webservers with this: > > 300 threads, and 3x HHTP Request HTTPClient, each one has a > different url > location. > > If I wanted to get the results of a Load Balancer, serving the 2 > webservers, > would I: > > a) do 600 threads, and 3x HHTP Request HTTPClient, each one has a > different > url location (for webserver 1) and 3x HTTP Request HTTPClient (for > webserver > 2) > or > b) do 300 threads and 6x HTTP Request HTTPClient, done so that the > first one > is with WS1, first url, 2nd one is WS2, first url, etc.... > > in my head, logically, a LB, should be able to sever 600 clients, > with 3 > HTTPClient requests: while having almost the same latency.. but i'm > not > getting that. > > > so I decided to use jmeter to simulate conecting to both webservers > at the > same time... > > I hope this makes sense.... > > > thanks! > > William > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
