The openjdk is not a JIT for s390x. java-9-openJDK adds a JIT capability (it's
in the ClefOS EPEL repo). You should use the IBM Java SDK you'll be very
pleasantly surprised by the improvement.
On 10/3/18, 09:24, "Linux on 390 Port on behalf of Frank M. Ramaekers"
<LINUX-390@VM.MARIST.EDU on behalf of framaek...@ailife.com> wrote:
I'm porting applications from an iLinux to a zLinux and am experiencing
performance problems on one particular process. This process uses dscli (IBM
Data Storage Command Line Interface) to our DS8870 to retrieve information and
report statistics (allocation).
On an Intel Linux virtual machine, the process statistics:
$ time ./getinfo.rex
real 54m57.647s
user 9m16.209s
sys 0m38.034s
Compared to zLinux (ClefOS 7.4):
$ time ./getinfo.rex
real 480m57.309s
user 443m1.009s
sys 2m13.860s
I have had no performance problems with any other process that I've
migrated to zLinux. The process do use a different version of Java:
iLinux:
/usr/java/jdk1.6.0_03/bin/java
-Dcom.ibm.storage.ess.cli.instbase=/opt/ibm/dscli ...
zLinux:
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.s390x/jre/bin/java
-Dcom.ibm.storage.ess.cli.instbase=/opt/ibm/dscli ...
Are there performance issues with OpenJava?
Frank M. Ramaekers Jr. | Systems Programmer | Information Technology |
American Income Life Insurance Company | 254-761-6649 (732-6649)
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