Solution : https://service.sap.com/sap/support/notes/1406548 (SAP Service marketplace login required)
Key words : 
/usr/sap/<sid>/<jcxx>/<dvebmgsxx>/j2ee/cluster directory, running '/opt/ibmjava2-ppc64-142/jre/bin/java -fullversion', /usr/sap/<sid>/<jcxx>/<dvebmgsxx>/j2ee/configtool/configtool, 3  -xparroot  -xconcurrentlevel6  -xconcurrentbackground4  -xsoftrefthreshold0  -xconmeter2  -xk17000  -xp2048k, lang=en_us& source=swg-ibmjavaisvthe access key, request=exclusive+prepwalk  -xsoftrefthreshold1please implement sap note 905211, sap netweaver application server java environments http, unlimited strength jurisdiction policy files, significant native memory footprint reduction, filter=java/lang/outofmemoryerror
Related Notes : 
       
| 1559462 | |
| 1495160 | SAP JVM as replacement for Partner JDKs 1.4.2 | 
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| 1408282 | New IBM JDK 1.4.2 for Linux running on Power Servers | 
| 1406549 | Recommended Settings for the Linux on POWER JVM (Classic VM) | 
| 1265455 | How can you generate a system dump for analysis using MAT? | 
| 1259465 | How to get a heapdump which can by analyzed with MAT | 
| 905211 | PCD Cache Optimizer Tuning | 
| 862674 | Reduced Performance of SAP NetWeaver Java in Debug mode | 
| 810008 | General JVM Information for Linux running on Power servers | 
| 754699 | |
| 739043 | |
| 723909 | Java VM settings for J2EE 6.40/7.0 |