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Java Forum / General / September 2006jview vs java.exe (speed)
Hi, I just got a new OS (XP) that didn't include a JVM or jview. I was using jview to run my local Java applications but now have to switch to java.exe. What a difference!! and not for the better. I have a little application that does DSP and animation and it appears to be running between 5 and 10 as slow now. Am I doing something wrong? If not, how do I reinstall jview? Thomas ... > I just got a new OS (XP) that didn't include a JVM or jview. I was using > jview to run my local Java applications but now have to switch to java.exe. > What a difference!! and not for the better. JView - launching the MS JVM, provides access to am obsolete, unsupported VM with security holes that will *never* be fixed. The manufacturers own 'support' advice for the MSVM amounted to* 1) a tool to identify dependencies on MS specific classes, and 2) a link to Sun, for the Java Plug-In. * last time I checked, over 18 months ago. The MSVM does not support Swing (out of the box) or anything else since ..Java 1.2. >...I have a little application that > does DSP and animation and it appears to be running between 5 and 10 as slow > now. Apparently this tool you refer to uses no MS specific classes, so that leaves you with option 2). >..Am I doing something wrong? If not, how do I reinstall jview? 1) Get a time machine.. .. Andrew T. >>..Am I doing something wrong? If not, how do I reinstall jview? > > 1) Get a time machine.. > .. The work I mainly use Java for is internal lab work. Java is great at crunching numbers and I really need the speed and not so much the portability. So what I just did to solve my speed problem was to install the MSJVM off the net (msjavx86.exe) and then install an old JDK which is needed to compile. For the application I was running I noticed a speed difference of just over 10 times. That's not mice nuts. I'm not sure why Sun can't make their java.exe perform at a level equivalent (or even close) to jview? I mean, aren't they the ones that developed the language in the first place? Thomas > >>..Am I doing something wrong? If not, how do I reinstall jview? > > [quoted text clipped - 11 lines] > java.exe perform at a level equivalent (or even close) to jview? I mean, > aren't they the ones that developed the language in the first place? You have struck one of the area where the MSVM shines brightly - it is fast at what (little) it does. Although I have never seen a repeatable test that supported it was *ten* times faster than the Sun JVM, when doing raw number crunching, it usually beat the Sun VM by a factor of at least 2-4 (twice to four times as fast), from memory. I suspect that part of it is that MS used lower level calls to the hardware, much lower and faster than what they are prepared to publicly document. If that is the case, they would always have the potential to build a faster VM than Sun could. Also, Sun seems to concentrate their efforts on optimising other things, rather than raw number-crunching ability (which is rarely the bottleneck). (concedes) You might still be able to find an 'unauthorised' distribution of the MSVM on the net. Someone was offering it some time ago after MS withdrew it's JVM from IE. I have not checked recently if the site is still active, and do not have the URL handy. I suppose Google is your best bet there. Andrew T. >>>..Am I doing something wrong? If not, how do I reinstall jview? >> [quoted text clipped - 11 lines] > java.exe perform at a level equivalent (or even close) to jview? I mean, > aren't they the ones that developed the language in the first place? This might be like asking why a Microsoft employee can complete a 100 meter *dash* in 15 seconds, whereas a Sun employee takes 20 seconds to complete a 100 meter *hurdle*. The so-called Microsoft "JVM" doesn't implement the Java standard, so the two virtual machines aren't actually competing under the same conditions. If you need pure number crunching abilities without regards to portability, I heard FORTRAN is one of the best languages for that. - Oliver > >>..Am I doing something wrong? If not, how do I reinstall jview? > > [quoted text clipped - 13 lines] > > Thomas Since you mention "number crunching" and lousy performance in your post, you are probably running into issues with the terrible performance of the trig functions in the newer JVMs. Java 1.3 was the last release with good trig performance. The trig functions were "fixed" in the 1.4 release to provide infinite precision during argument reduction. Now you can get an accurate value for sin(2000000000).....if you're willing to wait long enough. If you need better performance you either have to 1) code your own routines in Java (e.g. from the Cephes library), or 2) use JNI to access the C math functions. ~Glynne > The work I mainly use Java for is internal lab work. Java is great at > crunching numbers and I really need the speed and not so much the [quoted text clipped - 6 lines] > java.exe perform at a level equivalent (or even close) to jview? I mean, > aren't they the ones that developed the language in the first place? This does not match my experience. My experience is that SUN JVM passed MS JVM when SUN JVM went from 1.3.1 to 1.4.1 (I have never tested 1.4.0). But of course it depends on what the program do. Arne Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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