Re: Users - Any estimate of performance--Bsh vs Minilang vs Java?
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Re: Users - Any estimate of performance--Bsh vs Minilang vs Java?
 
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Re: Users - Any estimate of performance--Bsh vs Minilang vs Java?
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Re: Users - Any estimate of performance--Bsh vs Minilang vs Java?
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In reply to this post by Adrian Crum
This varies a lot by the actual code being run... BSH is often slower because it has to use a lot of introspection to dynamically call methods, create objects, etc, etc. The mini-lang stuff does _not_ have this problem unless you are using a lot of call-object-method or call-class-method operations (which are not commonly used, or are used infrequently to specific Java methods). Whether it is fast enough or not should ALWAYS be determined through profiling if it is important. It is a lot more effort to write a service in Java versus in a simple-method, so how do you know if it is worth it? The only way to find out is through profiling. Not doing so is a somewhat dangerous assumption, so I really wouldn't recommend that. From my own profiling I've found that the performance difference for BSH is not even _close_ to 100-300 times slower, not even close. We use a cached class loader and some other things (like caching compiled bsh scripts) to significantly improve the speed, but you should know that with the performance enhancements in place with OFBiz pages that were converted from JSP (which is converted to a Java file and compiled) to FTL/BSH were only 20-40% slower. That's a long shot from 10,000-30,000% slower... So, yeah, the numbers can be a lot different than you think... So unless you _really_ need a lot of speed and your code involves absolutely zero database operations (ie it is tight loop and memory/ cpu intensive) then writing it in Java will result in such a negligible difference that it isn't even close to worth the effort required to write and maintain it... Don't worry, we didn't just pull this stuff out of a box without playing with it in real world situations, including performance constraints and such. I have plenty of experience with profiling and optimization coming from a graphics and UI background (even back in the days when processor specific assembly code was required for decent performance, way before the modern accelerated graphics cards and what not). The same principles _always_ apply for optimization: write it so it works then test to see what is slow, then find a way to speed it up. Doing anything else is just guessing and I know from experience that hit/miss ratios for this for most people (even if they've done a lot of profiling in other things) is often dead, dead, dead wrong and a lot of work goes into almost no performance increase. -David On Mar 7, 2006, at 11:25 AM, Adrian Crum wrote: > I'm sure everyone will have their own opinions on the best strategy > for > development. Here's mine... > > Development in bsh or mini-lang is fast - because you can modify > the code while > the server is running. Development in java is slow because you have > to restart > the server every time you recompile. > > The approach I've taken is to develop in bsh, then when I'm sure > the bsh code is > finished, I move it to java - for speed. > > > Vinay Agarwal wrote: > >> Hello, >> >> >> >> Knowing approximate performance level is helpful to me for >> choosing Bsh, >> Minilang, or Java. I understand that bsh can be 100-300 times slower >> than Java. Is there an estimate of Minlang performance compared to >> Java? >> >> >> >> Regards, >> >> Vinay Agarwal >> >> >> --------------------------------------------------------------------- >> --- >> >> >> _______________________________________________ >> Users mailing list >> [hidden email] >> http://lists.ofbiz.org/mailman/listinfo/users > > _______________________________________________ > Users mailing list > [hidden email] > http://lists.ofbiz.org/mailman/listinfo/users _______________________________________________ Users mailing list [hidden email] http://lists.ofbiz.org/mailman/listinfo/users |
smime.p7s (3K)
Re: Users - Any estimate of performance--Bsh vs Minilangvs Java?
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Re: Users - Any estimate of performance--Bsh vs Minilangvs Java?
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