Comments on: Cost of Optimization is Greater than the Cost of Synchronization http://www.whirlycott.com/phil/2004/11/23/cost-of-optimization-is-greater-than-the-cost-of-synchronization/ Philip Jacob's web page Tue, 13 Sep 2011 08:59:30 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Mark Boon http://www.whirlycott.com/phil/2004/11/23/cost-of-optimization-is-greater-than-the-cost-of-synchronization/comment-page-1/#comment-12 Mark Boon Thu, 25 Nov 2004 14:22:09 +0000 http://www.whirlycott.com/phil/?p=22#comment-12 Object pooling can be essential when creating large numbers of objects, be they large or small. What is essential is whether the object can be initialised much faster than it can be allocated. In board-game programming this is widely used, as the program can easily become an order of magnitude slower when doing 'new' and let the GC do its work millions of times instead of (just an example) popping a Move element from an ArrayList and set its x and y coordinates and its piece-type. Object pooling can be essential when creating large numbers of objects, be they large or small. What is essential is whether the object can be initialised much faster than it can be allocated. In board-game programming this is widely used, as the program can easily become an order of magnitude slower when doing ‘new’ and let the GC do its work millions of times instead of (just an example) popping a Move element from an ArrayList and set its x and y coordinates and its piece-type.

]]> By: Radu-A. Popescu http://www.whirlycott.com/phil/2004/11/23/cost-of-optimization-is-greater-than-the-cost-of-synchronization/comment-page-1/#comment-11 Radu-A. Popescu Thu, 25 Nov 2004 08:52:32 +0000 http://www.whirlycott.com/phil/?p=22#comment-11 Er, like I think object pools are generally useful when cost creation is high. Think network, database connections, images etc. Comparing a decent object pool to new Object() is rather pointless. Er, like I think object pools are generally useful when cost creation is high. Think network, database connections, images etc. Comparing a decent object pool to new Object() is rather pointless.

]]> By: toto http://www.whirlycott.com/phil/2004/11/23/cost-of-optimization-is-greater-than-the-cost-of-synchronization/comment-page-1/#comment-10 toto Wed, 24 Nov 2004 12:57:36 +0000 http://www.whirlycott.com/phil/?p=22#comment-10 People doing Object caches are so smart SUN cannot achieve the same things with the JVM ;-) ! Stop this sucker stuff. Just create Objects, and let the JVM handle its job, it is faster and safer. So far Thread pools and Object pool I saw are slow and buggy. The JVM is designed to do the work. Unless you like to reinvent the (same) wheel again and again, go on and do one more Object cache... People doing Object caches are so smart SUN cannot achieve the same things with the JVM ;-) !
Stop this sucker stuff. Just create Objects, and let the JVM handle its job, it is faster and safer. So far Thread pools and Object pool I saw are slow and buggy. The JVM is designed to do the work. Unless you like to reinvent the (same) wheel again and again, go on and do one more Object cache…

]]> By: Bob Lee http://www.whirlycott.com/phil/2004/11/23/cost-of-optimization-is-greater-than-the-cost-of-synchronization/comment-page-1/#comment-9 Bob Lee Tue, 23 Nov 2004 17:29:09 +0000 http://www.whirlycott.com/phil/?p=22#comment-9 Here's a faster and simpler approach I use to cache invocation objects in Dynaop (actually I don't use it anymore--I just create new instances). This approach extends the class it's pooling, so you could use something like cglib to create a generic implementation. https://dynaop.dev.java.net/source/browse/dynaop/src/dynaop/PooledInvocation.java?rev=1.6&content-type=text/vnd.viewcvs-markup Here’s a faster and simpler approach I use to cache invocation objects in Dynaop (actually I don’t use it anymore–I just create new instances). This approach extends the class it’s pooling, so you could use something like cglib to create a generic implementation.

https://dynaop.dev.java.net/source/browse/dynaop/src/dynaop/PooledInvocation.java?rev=1.6&content-type=text/vnd.viewcvs-markup

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