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#1 (**permalink**) 01-05-2008, 11:32 AM

Any idea why my java 1.5 would seem to run so terribly slow? I put
together a small prog that counts to a million and shows the runtime
in milliseconds. Running from the command line it's averaging about
1900 milliseconds. I still have java 1.3.1 installed on the same
system. If i run the same program with java 1.3.1 it averages about 95
milliseconds. I can't believe that from 3 to 5 the performance gets
that bad. Any suggestions on a mis-configuration that i might have?

#/usr/java5/jre/bin/java -version
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build
pap32devifx-20060818a (ifix: 108655: SR2 + 105972 + 107350 + 108225 +
108262))
IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 AIX ppc-32
j9vmap3223ifx-20060818 (JIT enabled)
J9VM - 20060501_06428_bHdSMR
JIT - 20060428_1800_r8
GC - 20060501_AA)
JCL - 20060818a

#/usr/java131/jre/bin/java -version
java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1)
Classic VM (build 1.3.1, J2RE 1.3.1 IBM AIX build ca131-20041210 (JIT
enabled: jitc))

#2 (**permalink**) 01-05-2008, 11:32 AM

On Apr 3, 1:14 pm, chrisw...@gmail.com wrote:
> Any idea why my java 1.5 would seem to run so terribly slow? I put
> together a small prog that counts to a million and shows the runtime
> in milliseconds. Running from the command line it's averaging about
> 1900 milliseconds. I still have java 1.3.1 installed on the same
> system. If i run the same program with java 1.3.1 it averages about 95
> milliseconds. I can't believe that from 3 to 5 the performance gets
> that bad. Any suggestions on a mis-configuration that i might have?
>
> #/usr/java5/jre/bin/java -version
> java version "1.5.0"
> Java(TM) 2 Runtime Environment, Standard Edition (build
> pap32devifx-20060818a (ifix: 108655: SR2 + 105972 + 107350 + 108225 +
> 108262))
> IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 AIX ppc-32
> j9vmap3223ifx-20060818 (JIT enabled)
> J9VM - 20060501_06428_bHdSMR
> JIT - 20060428_1800_r8
> GC - 20060501_AA)
> JCL - 20060818a
>
> #/usr/java131/jre/bin/java -version
> java version "1.3.1"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1)
> Classic VM (build 1.3.1, J2RE 1.3.1 IBM AIX build ca131-20041210 (JIT
> enabled: jitc))

Yesterday I heard a case where the app would use a Java Machine from a
specific version and mix some libraries from a different version. I
don't know how to check this issue though... :-(

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Java 1.5.0 very slow