Anderson,
In Linux, you can use standard commands ps (sorting processes by memory consumption) or top to see which processes are major resource consumers. In that list, do you see jstart processes (server nodes of SAP application server Java are started in context of OS processes jstart)? If yes, then from details of a process (for example, location from where jstart was launched), you can figure out, to which SAP system and instance those server nodes relate to.
From a screenshot you provided, I would also suggest to look into heap consumption. There are many ways to generate heap dump, but few most convenient are:
- Using utility jvmmon which is a part of SAP JVM shipment (see SAP Note 2065346 for detailed description),
- In newer versions of application server Java (releases 7.3 and higher), using NWA: Troubleshooting > Advanced Troubleshooting > Heap Dump Analysis.
Fast way to identify most obvious top consumers of heap memory using Eclipse Memory Analyzer is described in SAP Note 1883568.
Regards,
Vadim