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there is no way to get the histogram from the heap dump using jmap. Jmap can produce histogram from live process or from core dump. To browse the heap dump you can use Java VisualVM (part of JDK 1.6.0 update 7 or newer) or standalone VisualVM available at visualvm.dev.java.net
this is by far the best tool to load a 32 bit jvm heap dump produced by jmap -heap <pid> which dumps a heap.bin file which is around 2GB . All other choke or run out of memory themselves.