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From "Ralph Einfeldt" <ralph.einfe...@uptime-isc.de>
Subject AW: Re: Help, My Tomcat always down everyday!
Date Thu, 20 Sep 2001 13:00:51 GMT
As long as you don't have used packages com.sun.* there should be 
no difference between diffent vendors.

If you try IBM's and Sun's JDK this is true to more than 99.99 %
(as far as we know). What differs are the implementation bugs in the VM
or some implementation bugs in the libraries.

We have running our application under both VM's and had to change
nothing for this. (70K lines of java code + several hundred jsp files)

In rare (an unclear) conditions we get core dumps with both of them.
Sun's JDK crashes 2 to 3 times less than IBM's in our environment
with the given application (We don't use tomcat yet), in an other
environments or with other applications the resulty may vary.

> -----Urspr√ľngliche Nachricht-----
> Von: song yantao [mailto:akilus@efesco.com]
> Gesendet: Mittwoch, 19. September 2001 20:00
> An: tomcat-user@jakarta.apache.org
> Betreff: Re: Re: Help, My Tomcat always down everyday!
> 
> 
> >On Thu, 20 Sep 2001 17:53:42 +0800
> >akilus <akilus@efesco.com> wrote:
> >
> Thanks for your help, I used JDK1.3.1 and JDK1.3.0, the two 
> JDKs have the same problem.
> I will try JDK1.2.2 now, and see whether it have this problem or not.
> If JDK1.2.2 is the same for me, maybe the tomcat have some 
> problem with JDK. 
> But I dont want to use IBM JVM now, because I'm not familiar 
> with them, and I don't know whether I need to modify my jsp 
> program or not if I change to IBM JVM, because our program 
> utilize some functions of JDK and other packages from SUN.
> >> > 
> >> Thanks for your reply, but I use JSDK1.3.0.04, not 1.3.1, 
> and do you found the same problem of my JVM?
> >
> >Not tried it, sorry.
> >
> >> Such like this, when I restart tomcat, JAVA occupy 14M 
> memory, after some times, JAVA occupy 23M or more Memory, do 
> you have this problem? The memory of JAVA increased by time!!!
> >
> >This is normal.  By default the JVM will use up 64M without 
> releasing memory back to the OS.  You can set the maximum and 
> minimum amount of memory the JVM uses uses command line 
> parameters to the java command (see the documentation for the 
> 'java' command)
> >
> >> I 'm not familiar with IBM JVM,where can I found IBM JVM? 
> >
> >http://www-106.ibm.com/developerworks/java/jdk/linux130/?dwzone=java
> >
> >> And will it work good with tomcat? will IBM JVM have all 
> functions of JDK JVM?
> >
> >I'm using it and "it works for me"  ;o)
> >
> >
> >--
> >simon colston
> >simon@lexues.co.jp
> 

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