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POGWT Requestfactory performance suggestions
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copied!<p>I am observing really bad performance when using GWT requestfactory. For example, a request that takes my service layer 2 seconds to fullfil is taking GWT 20 seconds to serialize. My service is returning ~100 what will be EntityProxies. Each of these objects has what will become 4 ValueProxies and 2 more EntityProxies (100 root level EntityProxies, 400 ValueProxies and 200 additional EntityProxies). However, I see the same 10x performance degradation on much smaller datasets.</p> <p>Example of log snippet:</p> <pre><code>D 2012-10-18 22:42:39.546 ServiceLayerDecorator invoke: Inoking service layer took 2265 ms D 2012-10-18 22:42:58.957 RequestFactoryServlet doPost: Entire request took 22870 ms </code></pre> <p>I have added some profiling code to the <code>ServiceLayerDecorator#invoke</code> method and wrapped the entire servlet in a timer. I have profiled the service by itself, and it is indeed returning results in ~2s. </p> <p>I am using GWT 2.4, but have tested this on GWT 2.5rc1 and GWT 2.5rc2. My backend is on GAE, but I dont think that is playing a role here.</p> <p>I found <a href="http://code.google.com/p/google-web-toolkit/issues/detail?id=7231" rel="noreferrer">this bug</a> filed against 2.4, which seems to be very related. I have manually applied the patch from <a href="https://groups.google.com/forum/?fromgroups=#!topic/google-web-toolkit/o4qBbwmE7YA" rel="noreferrer">this google group</a> without any luck.</p> <p>My domain models look like:</p> <pre><code>class Trip { protected Address origin; // becomes ValueProxy protected Address destination; becomes ValueProxy protected Set<TripPassenger> tripPassengers; // Set of ValueProxies } class TripPassenger { protected Passenger passenger; } class Passenger { protected Account account; } </code></pre> <p>My question is:</p> <ul> <li>Have I profiled the code correctly and isolated the problem to the GWT serialization?</li> <li>Could I be doing something wrong that would cause this behavior?</li> <li>How can I better profile the GWT serialization code to try and figure out the cause?</li> </ul>

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