AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  One bytecode instruction -> how many asm?          AppletTalk.com Forum Index -> JVM, native methods and hardware View previous topic :: View next topic   Author Message John Doe Guest Posted: Sun Jul 11, 2004 3:14 am    Post subject: One bytecode instruction -> how many asm? On average, how many intel 386 assembler instructions are generated for one JVM bytecode instruction? Back to top Roedy Green Guest Posted: Sun Jul 11, 2004 7:56 am    Post subject: Re: One bytecode instruction -> how many asm? On Sat, 10 Jul 2004 22:14:44 -0500, John Doe <johndoe (AT) nowhere (DOT) com> wrote or quoted : Quote: On average, how many intel 386 assembler instructions are generated for one JVM bytecode instruction? What you could do is load classes, knowing the class file size and see the effect on available RAM after you exercise the methods for several minutes. -- Canadian Mind Products, Roedy Green. Coaching, problem solving, economical contract programming. See http://mindprod.com/jgloss/jgloss.html for The Java Glossary. Back to top Artur Biesiadowski Guest Posted: Sun Jul 11, 2004 3:11 pm    Post subject: Re: One bytecode instruction -> how many asm? John Doe wrote: Quote: On average, how many intel 386 assembler instructions are generated for one JVM bytecode instruction? Average is very bad metric here. A lot of instructions will generate 1-3 x86 opcodes, while some of them will be very heavy (invoke*, monitor*, throw, anewarray, etc). This heaviness of course depends if they are inlined or passed to some utility function. I suppose that most open source jvms allow to dump their generated code, so you will be able to see it yourself. For very easy exercise I would suggest tya, for more complicated (but more representative for real world jits) - orp. In tya, most opcodes generated 2-4 x86 instructions, 2-8 bytes. Heavier instructions like invoke, could easily go into 40-50 instruction count range, with probably 100-150 bytes taken. Maybe you can tell why do you need this metric ? Probably there are different metrics you can use which will be more reliable ? Artur Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> JVM, native methods and hardware All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.