Hi all,
Any comments as to Centos/RHEL 5.3's openjdk implementation versus Sun's?
cheers,
Christopher
2010/4/14 Christopher Chan christopher.chan@bradbury.edu.hk:
Hi all,
Any comments as to Centos/RHEL 5.3's openjdk implementation versus Sun's?
it's at least missing webstart ?
-- Eero
On Wednesday, April 14, 2010 02:26 PM, Eero Volotinen wrote:
2010/4/14 Christopher Chanchristopher.chan@bradbury.edu.hk:
Hi all,
Any comments as to Centos/RHEL 5.3's openjdk implementation versus Sun's?
it's at least missing webstart ?
Hmm, not sure if that is crucial to Corendal's operation...I guess I will just give openjdk a shot and switch if it borks on me.
Cheers,
Christopher
On Tue, Apr 13, 2010 at 11:03 PM, Christopher Chan christopher.chan@bradbury.edu.hk wrote:
Hi all,
Any comments as to Centos/RHEL 5.3's openjdk implementation versus Sun's?
cheers,
Christopher _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
RedHat has acknowleged that Sun's JDK is faster - despite the fact OpenJDK is native. Since it's native, it also means it's not platform independent (in the sense of compile once run anywhere.)
See the Fedora mailing list - there was discussion about a year ago.
On Friday, April 16, 2010 11:44 AM, Agile Aspect wrote:
On Tue, Apr 13, 2010 at 11:03 PM, Christopher Chan christopher.chan@bradbury.edu.hk wrote:
Hi all,
Any comments as to Centos/RHEL 5.3's openjdk implementation versus Sun's?
RedHat has acknowleged that Sun's JDK is faster - despite the fact OpenJDK is native. Since it's native, it also means it's not platform independent (in the sense of compile once run anywhere.)
Argh, it appears that I have gotten so used to installing the jdk, it does not click when all I actually want at the moment is the jvm.
How do the jvms compare?
See the Fedora mailing list - there was discussion about a year ago.
Sun's JDK is faster eh...I guess that is sad news.
RedHat has acknowleged that Sun's JDK is faster - despite the fact OpenJDK is native. Since it's native, it also means it's not platform independent (in the sense of compile once run anywhere.)
What do you mean "is native" ?
The JDK (or rather the JVM) is native on all OS, since it is the layer which makes the Java compiled bytecode portable. OpenJDK could even be seen as more portable since the IcedTea build harness allows to port it to more platforms via the Zero JIT (there is a significant amount of processor-dependent assembler code in the JVM)
I'm using OpenJDK on my servers and desktops under CentOS/Fedora for years, and my customers run the Java binaries on Windows without problem.
I have no idea about speed difference, but I would be a bit surprised if it would be very big. My understanding is that the (native) Hotspot JVM is basically the same for both products and that the differences are about some java libraries. That would be interesting if you could send a reference to this Fedora thread.
More generally OpenJDK is not a separate independent project (like Blackdown used to be, or Apache Harmony still is), this is just the Sun JVM codebase, with compatible licenses (some patches are then applied by the IcedTea build harness when building the binaries from OpenJDK sources).
On Friday, April 16, 2010 02:54 PM, Mathieu Baudier wrote:
RedHat has acknowleged that Sun's JDK is faster - despite the fact OpenJDK is native. Since it's native, it also means it's not platform independent (in the sense of compile once run anywhere.)
What do you mean "is native" ?
I assumed he meant that the class files compiled by OpenJDK are native...
The JDK (or rather the JVM) is native on all OS, since it is the layer which makes the Java compiled bytecode portable. OpenJDK could even be seen as more portable since the IcedTea build harness allows to port it to more platforms via the Zero JIT (there is a significant amount of processor-dependent assembler code in the JVM)
I'm using OpenJDK on my servers and desktops under CentOS/Fedora for years, and my customers run the Java binaries on Windows without problem.
I guess that assumption can now go out the window. Maybe he was talking about gcj thinking it was OpenJDK...
I have no idea about speed difference, but I would be a bit surprised
if it would be very big. My understanding is that the (native) Hotspot JVM is basically the same for both products and that the differences are about some java libraries. That would be interesting if you could send a reference to this Fedora thread.
More generally OpenJDK is not a separate independent project (like Blackdown used to be, or Apache Harmony still is), this is just the Sun JVM codebase, with compatible licenses (some patches are then applied by the IcedTea build harness when building the binaries from OpenJDK sources).
Most of the Sun codebase anyway...
Mathieu Baudier wrote:
RedHat has acknowleged that Sun's JDK is faster - despite the fact OpenJDK is native. Since it's native, it also means it's not platform independent (in the sense of compile once run anywhere.)
What do you mean "is native" ?
The JDK (or rather the JVM) is native on all OS, since it is the layer which makes the Java compiled bytecode portable. OpenJDK could even be seen as more portable since the IcedTea build harness allows to port it to more platforms via the Zero JIT (there is a significant amount of processor-dependent assembler code in the JVM)
I'm using OpenJDK on my servers and desktops under CentOS/Fedora for years, and my customers run the Java binaries on Windows without problem.
I have no idea about speed difference, but I would be a bit surprised if it would be very big. My understanding is that the (native) Hotspot JVM is basically the same for both products and that the differences are about some java libraries. That would be interesting if you could send a reference to this Fedora thread.
More generally OpenJDK is not a separate independent project (like Blackdown used to be, or Apache Harmony still is), this is just the Sun JVM codebase, with compatible licenses (some patches are then applied by the IcedTea build harness when building the binaries from OpenJDK sources).
I thought they were pretty much the same with OpenJDK just having some rewritten code due to third party license issues in the Sun version. There may still be some bugs and missing functionality especially with the older version that RHEL/Centos includes. For example, OpenNMS would require a newer OpenJDK but runs with (and includes, if you use their yum repo) a Sun 1.5 version.
On Tue, Apr 20, 2010 at 7:45 PM, Gordon Messmer
Are you confusing OpenJDK with gcj?
GCJ produces objects and runs roughly 10 times faster then either OpenJDK or Sun's JDK.
It sounds that way.
The sound must be coming from the voices in your head.
On 04/21/2010 01:29 PM, Agile Aspect wrote:
On Tue, Apr 20, 2010 at 7:45 PM, Gordon Messmer
Are you confusing OpenJDK with gcj?
GCJ produces objects and runs roughly 10 times faster then either OpenJDK or Sun's JDK.
Citation?
It sounds that way.
The sound must be coming from the voices in your head.
OK. What did you mean when you stated that OpenJDK is "native"?
-
Agile Aspect -
Christopher Chan -
Eero Volotinen -
Gordon Messmer -
Les Mikesell -
Mathieu Baudier