3

Using CentOS 6.2, both of these installations are on the same server:

After doing a 'minimal' install Java programs run incredibly slow. After doing a 'software development workstation' install Java programs run at normal speed.

Some information gathered so far:

  • Enabling services not present in the minimal install, e.g., irqbalance, cpuspeed has not helped

  • Have done benchmarks using Phoronix suite to test CPU/RAM/HD speed. These tests all run fine on both installs.

  • Have done benchmarks using DaCapo suite (which is in Java). These tests all run terribly (that is, 5-50 times slower) on the minimal install.

  • Have tried multiple versions of JRE: OpenJDK 6, Sun Java 6, Sun Java 7

  • Have updated to the latest packages with yum

  • Have verified this slowdown multiple times on two different servers.

  • Both servers use Xeon dual core processors, and have 16GB of RAM or more

Anyone have any idea what could cause this?

Robby Cornelissen
  • 91,784
  • 22
  • 134
  • 156
user24601
  • 71
  • 1
  • 4
  • 3
    The minimal install is possibly missing the --server JVM. Try to load java with "java --server -version" and see if it works. – Maurício Linhares Feb 15 '12 at 20:15
  • Thanks for your response!. It returns: java version "1.6.0_22" OpenJDK Runtime Environment (IcedTea6 1.10.6) (rhel-1.43.1.10.6.el6_2-x86_64) OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode) The benchmarks run slowly with the -server option as well – user24601 Feb 15 '12 at 20:24
  • are you sure you tried with sun java 7? should be best option. Install again and do java -version. – JIV Jul 23 '14 at 15:20

1 Answers1

1

when you test the oracle jdk was it the bin file from the oracle site?

The package from oracle should perform exactly the same: please download these rpms (they will install on centos 6 just fine)

java_rpm java_devel

These are official packages (you need to install both). You also then need to do:

(select which java you want to use)

alternatives --config java

(select which javac you want to use)

alternative -- config javac
YK-47
  • 198
  • 3
  • 18