Closing the loop on this, the formats are different because 1.0.3 has more tags for the data that is included in the dump. hprof-conv mostly converts these to the UNKNOWN tag. This can be seen in the source here: https://github.com/android/platform_dalvik/blob/master/tools/hprof-conv/HprofConv.c#L492
The extra tags are listed here: https://github.com/android/platform_dalvik/blob/master/tools/hprof-conv/HprofConv.c#L76 On the dalvik side they are defined here: https://gitorious.org/0xdroid/dalvik/source/b7fdbab46f67253caa15f2cc9d37be295239e075:vm/hprof/Hprof.h I haven't found a great explanation of what all the tags mean. On Sunday, September 7, 2014 3:42:54 PM UTC-4, David Cameron wrote: > > Oh yes, the link to the hprof spec: > [1] https://java.net/downloads/heap-snapshot/hprof-binary-format.html > > On Sunday, September 7, 2014 3:42:12 PM UTC-4, David Cameron wrote: >> >> To set the stage: I'm wrestling with OutOfMemoryExceptions, and beginning >> to suspect heap fragmentation as the root cause. >> >> I know that the hprof files dumped from the monitor tool are a slightly >> different format (JAVA PROFILE 1.0.3) from the "standard" java hprofs (JAVA >> PROFILE 1.0.2). I know that hprof-conv can convert a 1.0.3 formatted hprof >> to a 1.0.2 formatted hprof. I also think I've found a spec for the binary >> 1.0.2 format [1]. However, I was curious about the 1.0.3 format and have >> just done some searching, but haven't been able to find anything describing >> it on the developers.android.com site or the AOSP site at >> source.android.com. Is the 1.0.3 format documented and described >> anywhere? >> >> I have looked at both YourKit and MAT to analyze the heap dumps, but >> neither of them address fragmentation at all. I guess fragmentation is >> not much of an issue for server and desktop jvms. The hprof format >> appears to contain address information, so some kind of fragmentation >> analysis should be possible. I read that ART's GC will also eventually be a >> compacting collector, which is good news! In the meantime I'd like to try >> to use the address information in the hprof files to estimate heap >> fragmentation. >> >> >> Dave >> > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
