AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  looking for performance statistics (native JAVA processors)          AppletTalk.com Forum Index -> JVM, native methods and hardware View previous topic :: View next topic   Author Message noone Guest Posted: Sun Mar 05, 2006 6:12 pm    Post subject: looking for performance statistics (native JAVA processors) hey. Does anyone have references to performance stats or whitepapers about performance of native java processors vs. software jvm for embedded apps? I read the hardware specs on a couple of 100mhz processors and they didn't seem very impressive, even for running bytecode in hardware. One spec showed a benchmark of copying a 10,000 byte array in 64ms. On the surface that seems fast but consider that 10000/0.064secs=1.25mbits/sec. and they include an ethernet tranceiver on the eval board. I haven't used a 1mb/s ethernet in nearly 15 years! I guess what I'm really wondering is whether there are java native processors out there that can approach risc mips levels. I understand that there will be emulation overhead even in hardware but my requirements will be to keep up with 802.11b wireless speeds: 11bm/s. Anyone know of java native processors that can deliver that kind of thru-put and support the FULL J2ME specs? tanks Back to top Thomas Hawtin Guest Posted: Sun Mar 05, 2006 8:12 pm    Post subject: Re: looking for performance statistics (native JAVA processo noone wrote: Quote: Does anyone have references to performance stats or whitepapers about performance of native java processors vs. software jvm for embedded apps? I read the hardware specs on a couple of 100mhz processors and they didn't seem very impressive, even for running bytecode in hardware. One spec showed a benchmark of copying a 10,000 byte array in 64ms. On the surface that seems fast but consider that 10000/0.064secs=1.25mbits/sec. and they include an ethernet tranceiver on the eval board. I haven't used a 1mb/s ethernet in nearly 15 years! 640 cycles per iteration. Running interpreted on my desktop machine gives around 200 cycles per iteration. However, CLDC (and even RTSJ) have block copying methods which will presumably be written natively. Quote: I guess what I'm really wondering is whether there are java native processors out there that can approach risc mips levels. I understand that there will be emulation overhead even in hardware but my requirements will be to keep up with 802.11b wireless speeds: 11bm/s. Anyone know of java native processors that can deliver that kind of thru-put and support the FULL J2ME specs? ARM processors with Jazelle can execute Java byte code directly at a reasonable pace. They also support Ahead-Of-Time (AOT) compilation for speed critical parts. http://www.arm.com/products/esd/jazelle_home.html http://www.arm.com/linux/ Tom Hawtin -- Unemployed English Java programmer http://jroller.com/page/tackline/ 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.