The Heapdump agent uses this option to specify the type of file to produce.
You can specify a PHD Heapdump, a classic text Heapdump, or both. For example:
–Xdump:heap:opts=PHD (default)
–Xdump:heap:opts=CLASSIC
–Xdump:heap:opts=PHD+CLASSIC
See Enabling text formatted ("classic") Heapdumps for more information.