System dumps involve dumping the address space and as such are generally very large.
The bigger the footprint of an application the bigger its dump. A dump of a major server-based application might take up many gigabytes of file space and take several minutes to complete. In this example, the file name is overridden from the default.
java -Xgcpolicy:metronome -Xdump:system:events=vmstop,file=my.dmp ::::::::: removed usage info ::::::::: JVMDUMP006I Processing Dump Event "vmstop", detail "#00000000" - Please Wait. JVMDUMP007I JVM Requesting System Dump using '/home/user/my.dmp' JVMDUMP010I System Dump written to /home/user/my.dmp JVMDUMP013I Processed Dump Event "vmstop", detail "#00000000".
See Using system dumps and the dump viewer for more information about analyzing a system dump.