Thanks for the response Deepak, but I will respectfully disagree with the assertion that states that it's not possible or worthwhile to try to replicate concurrent resource fetching.
Of course each browser has differences, even different numbers of concurrent downloads, but JMeter is already attempting to emulate this in the HttpSampler with a concurrent download option. It would be easy to resolve the issue just by adding a set of URLs to the HttpSampler which are statically defined embedded resources (those it doesn't parse out we can just add ourselves), and have it download those using its X number of concurrent connections feature. I wouldn't try to solve the problem by improving how JMeter parses the resources out. Although it's always nice to improve that feature, JMeter can never be 100% for all applications. I have worked for 9 years as a consultant for HP's LoadRunner and BAC testing tools and will tell you even those million dollar testing packages can't parse all the resources from an HTML page (though they add static resources to a DL list automatically of course). Everything we do is going to be an approximation of reality, it's up to each application engineer to know their app and to do the best they can to approximate it. But having the ability to make a reasonable approximation is critical - and this is fundamental functionality used by all browsers in virtually every real-world scenario. To download each unparsed resource of a page in sequence makes it extremely difficult to built a semi-realistic test case, and the further we get from realistic the less valuable a tool like this becomes. If there's no way to do this I, for one, am sure to put JMeter on the shelf and consider other options. But I'll be very surprised if this issue hasn't been discussed at infinitum already. -----Original Message----- From: Deepak Shetty [mailto:shet...@gmail.com] Sent: Sunday, October 09, 2011 10:30 AM To: JMeter Users List Subject: Re: Emulating a browsers resource download patterns >From the release note for 2.5.1 >Additional known bugs: Version 2.5 introduced a concurrent download >feature for embedded HTML resources. Unfortunately this may result in >corrupted downloads or other errors (bugs 51918[1] and 51919[2]). We >will fix these bugs as soon as possible; meanwhile the feature should >not be used. > But the HTTP Request Sampler only parses out about 1/5th of the resources on the page, There are some circumstances in which this is possible(other than bugs!) . e.g. Background Images referred to in CSS files (Jmeter will download resources for a page , but not resources within the resources like CSS files which refer to images). Dynamically added resources (from AJAX calls or javascript) wont work either - As always JMeter is not a browser. You might need to put in a feature request in bugzilla if you can identify patterns within your page that the embedded resource parser isnt picking up. The problem with the type of results you want actually depend on multiple questions - Which browser? Which setting on the browser? (e.g. IE which controls how resources are cached)? When is a page considered loaded - especially when you account for DHTML rich/AJAX applications? And is it worth it (for e.g. if you use a CDN it probably isnt). And if you still really want to know its probably to use browser driven tools like selenium (or selenium grid) to find out the answer - or selenium + jmeter where jmeter generates the load you want and a single selenium instance can browse the site and record page times ). Using JMeter would need you to estimate this answer (for e.g. if you get values for each individual resources then using firebug and the network tab you can figure out the time for page load). regards deepak On Sun, Oct 9, 2011 at 9:34 AM, David Parks <davidpark...@yahoo.com> wrote: > A browser typically opens about 4 connections to download all of the > resources of a page. I'd naturally like to emulate this behavior in my test > cases. > > I see that the HTTP Request Sampler has an option to do exactly this with > the parsed "Embedded Resources". > > But the HTTP Request Sampler only parses out about 1/5th of the resources > on > the page, instead I just record the page and all its resources with a > Recording Controller. > > But now each resource is an HTTP Sampler its self and I have no way of > emulating the 4 concurrent downloads, they download in sequence. > > Thus I don't see how to even come close to accurately simulating browser > load, and certainly don't see a way to accurately time a page download. > > Perhaps I missed something? But I didn't see this question addressed in the > docs or FAQ's. > > Thanks, > Dave > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: jmeter-user-unsubscr...@jakarta.apache.org > For additional commands, e-mail: jmeter-user-h...@jakarta.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: jmeter-user-unsubscr...@jakarta.apache.org For additional commands, e-mail: jmeter-user-h...@jakarta.apache.org
