Solution : https://service.sap.com/sap/support/notes/1417930 (SAP Service marketplace login required)
Key words : 
sap jvm patch collection 34 relates, default filename 'thread_dump_@pid', actual file exceeds -xx, separate rotating file-set, single thread dump exceeds, symptom sap jvm 5, sap jvm build 5, sap jvm patch, place holder '@pid', vm option -xx
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