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POIs performance of Grails 2.0 really that awfully low?
 

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  1. POIs performance of Grails 2.0 really that awfully low?
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    <p>I'm somewhat newbie for WEB development based on JVM stack, but future project will require specifically some JVM-based WEB engine. So I started looking on some ground to make things quickly and turned to try Grails. Things looked good from the book, but beeing impressed by really long startup time (grails run-app) I decided to test how this works under load. Here it is:</p> <ul> <li><p>test app: follow few instruction here to make it from ground (takes 2 mins assuming you already have Grails and Tomcat installed): </p> <p>_http://grails.org/Quick+Start</p></li> <li><p>test case (with Apache benchmark - comes with Apache httpd - _http://httpd.apache.org):</p> <p>ab.exe -n 500 -c _http://localhost:8080/my-project/book/create <br/> (Note: this is just displays 2 input fields within styled container)</p></li> <li><p>hardware: Intel i5 650 (4Core*3.2GHz) 8GB Ram &amp; Win Server 2003 x64</p></li> </ul> <p>The result is ..</p> <p><b>Grails: 32 Req/Sec</b></p> <pre><code>Total transferred: 1380500 bytes HTML transferred: 1297500 bytes Requests per second: 32.45 [#/sec] (mean) Time per request: 308.129 [ms] (mean) Time per request: 30.813 [ms] (mean, across all concurrent requests) Transfer rate: 87.51 [Kbytes/sec] received </code></pre> <p>(Only 32 Req/Sec with 100% of CPU saturation, this is a way too below my expectations for such hardware)</p> <p>... Next - i tried to compare it for example with similar dummy JSF application (i took one here: _http://www.ibm.com/developerworks/library/j-jsf2/ - look for "Source code with JAR files", there is \jsf-example2\target\jsf-example2-1.0.war inside),</p> <ul> <li>test case: ab.exe -n 500 -c 10 _http://localhost:8080/jsf/backend/listing.jsp</li> </ul> <p>The result is ..</p> <p><b>JSF: 400 Req/Sec</b></p> <pre><code>Total transferred: 5178234 bytes HTML transferred: 5065734 bytes Requests per second: 405.06 [#/sec] (mean) Time per request: 24.688 [ms] (mean) Time per request: 2.469 [ms] (mean, across all concurrent requests) Transfer rate: 4096.65 [Kbytes/sec] received </code></pre> <p>... And finally goes raw dummy JSP (just for reference)</p> <p><b>Jsp: 8000 req/sec:</b></p> <pre><code>&lt;html&gt; &lt;body&gt; &lt;% for( int i = 0; i &lt; 100; i ++ ) { %&gt; Dummy Jsp &lt;%= i %&gt; &lt;/br&gt; &lt;% } %&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Result:</p> <pre><code>Total transferred: 12365000 bytes HTML transferred: 11120000 bytes Requests per second: 7999.90 [#/sec] (mean) Time per request: 1.250 [ms] (mean) Time per request: 0.125 [ms] (mean, across all concurrent requests) Transfer rate: 19320.07 [Kbytes/sec] received </code></pre> <p>...</p> <p><b>Am i missing something?</b> ... and Grails app can run much better?</p> <p>PS: I tried profiling my running Grails app with VisualVM, but got endless loop of messages like ...</p> <pre><code>Profiler Agent: Redefining 100 classes at idx 0, out of total 413 ... Profiler Agent: Redefining 100 classes at idx 0, out of total 769 ... </code></pre> <p>And finally app just stopped working after few mins - so, looks like profiling Grails is no the choice for good diagnose.</p> <p><b>Update</b> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </p> <p>First of all I have to admin, yes i need to RTFM - i.e. 'grails run-app' is not the correct way to run Grails for performance measurement. After compiling WAR and deploying it to Tomcat performance is not that awfully low - it is just low. The metrics below are for concurrency of 1 user (I just wanted to check what is MAX performance of the framework in one thread and with no heavy load) and while reading other related posts here i came to "http://stackoverflow.com/questions/819684/jsf-and-spring-performance-vs-poor-jsp-performance" and decided to check Apache Wicket mentioned there - its performance is also included.</p> <p>Use case is: - ab.exe -n 500 -c 1 _http://localhost:8080/... - server is Tomcat7 in vFabric tcServer Dev edition with 'insight' running on background</p> <pre><code>---------------------- tcServer Plain Tomcat 7 -c 10 /Grails/book/create 77 req/sec 130 req/sec 410 req/sec /jsf/backend/listing.jsp 133 req/sec 194 req/sec 395 req/sec /wicket/library/ 870 req/sec 1400 req/sec 5300 req/sec </code></pre> <p>So ... anyway there is something wrong with Grails. I have made some profiling using tcServer (thanks Karthick) - it looks like it is able only to trace 'Spring-based' actions and internal stacktrace for Grails is like following (for 2 requests - note: metrics are not stable - i bet accuracy of tcServer far from beeing perfect, but can be used just for inforamtion)</p> <pre><code>Total (81ms) Filter: urlMapping (32ms) -&gt; SimpleGrailsController#handleRequest (26ms) -&gt; Render view "/book/create" (4ms) Render view "/layouts/main.gsp" (47ms) Total (79ms) Filter: urlMapping (56ms) -&gt; -&gt; SimpleGrailsController#handleRequest (4ms) -&gt; Render view "/book/create" (38ms) Render view "/layouts/main.gsp" (22ms) </code></pre> <p>PS: it may happen that the root cause for bad performance in Grails are underlying 'Spring' libs, will check this in more details.</p>
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    1. COI'd edit your first post since you know your benchmark for Grails is bad.
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