[Freeipa-users] Freeipa on ARM (raspberry pi) - OpenJDK vs. Oracle JDK

[Petr Spacek]

On 1.12.2016 09:07, Winfried de Heiden wrote:
> Hi all,
> 
> Started as "just because it's possible" running FreeIPA on a BananaPI or 
> Raspberry PI turned to out to be rather succesfull and for more than a year I 
> use FreeIPA at home.
> 
> OK, running on small boards like Raspberry PI it never will be fast but it's 
> surely quick enough to run at small scale. However, starting FreeIPA became much 
> slower since Fedora 24 and even more on Fedora 25.
> Since Oracle Java is also available for ARM and there's much written this is 
> much faster I took some time for an experiment.
> 
> Starting FreeIPA using the default installation (running OpenJDK) starting 
> FreeIPA takes a painfull 15 minutes (afterward, it all just works fine):
> 
> [root at rpi2 sysconfig]# time ipactl start
> Starting Directory Service
> Starting krb5kdc Service
> Starting kadmin Service
> Starting named Service
> Starting ipa_memcached Service
> Starting httpd Service
> Starting ipa-custodia Service
> Starting ntpd Service
> Starting pki-tomcatd Service
> Starting ipa-otpd Service
> Starting ipa-dnskeysyncd Service
> ipa: INFO: The ipactl command was successful
> 
> real    15m40.638s
> user    0m33.095s
> sys    0m1.910s
> 
> Now, after installing Oracle Java and changing JAVA_HOME in 
> /etc/sysconfig/pki-tomcat to:
> 
> #JAVA_HOME="/usr/lib/jvm/jre-1.8.0-openjdk"
> JAVA_HOME="/opt/jdk1.8.0_111/jre"
> 
> [root at rpi2 sysconfig]# time ipactl start
> Starting Directory Service
> Starting krb5kdc Service
> Starting kadmin Service
> Starting named Service
> Starting ipa_memcached Service
> Starting httpd Service
> Starting ipa-custodia Service
> Starting ntpd Service
> Starting pki-tomcatd Service
> Starting ipa-otpd Service
> Starting ipa-dnskeysyncd Service
> ipa: INFO: The ipactl command was successful
> 
> real    2m14.823s
> user    0m33.400s
> sys    0m1.730s
> 
> Wow, I expected some improvement, but this far better than expected! This leaves 
> a question: what is happening here!!??

Huh? That is really huge difference. Please open a bug against OpenJDK:
https://bugzilla.redhat.com/enter_bug.cgi

That way it will reach OpenJDK developers. They will have better idea than
FreeIPA developers, I guess.

Please report the bug number to this forum so we can track it as well.

Thank you very much!
Petr^2 Spacek

> 
> I prefer to use OpenJDK, it 's Open Source and because it's availabe from the 
> Fedora ARM repositories it is also much more easy to update. But for now, Oracle 
> is much faster and OpenJDK from this point of view is a very poor alternative.
> Why is OpenJDK so much slower? Is improvement possible? For now (some 
> "tweaking") of in a future release?
> 
> For the record, I tested these Java versions:
> 
> [root at rpi2 sysconfig]# 
> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-3.b16.fc25.arm/jre/bin/java -version
> openjdk version "1.8.0_111"
> OpenJDK Runtime Environment (build 1.8.0_111-b16)
> OpenJDK Zero VM (build 25.111-b16, interpreted mode)
> 
> [root at rpi2 sysconfig]# /opt/jdk1.8.0_111/jre/bin/java -version
> java version "1.8.0_111"
> Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
> Java HotSpot(TM) Client VM (build 25.111-b14, mixed mode)
> 
> 
> Kind regards,
> 
> Winfried
> 
> 
> 


-- 
Petr^2 Spacek