Hey Andrew, This is really nice, thanks. Have you considered making the default, "Stack frames as pseudo-objects and running methods as pseudo-classes" ? Is there any downside?
IBM App Runtimes SWAT, Software Engineer
From:
mat-dev <mat-dev-bounces@xxxxxxxxxxx> on behalf of Andrew Johnson <andrew_johnson@xxxxxxxxxx>
Date: Wednesday, March 22, 2023 at 4:21 AM
To: mat-dev@xxxxxxxxxxx <mat-dev@xxxxxxxxxxx>
Subject: [EXTERNAL] [mat-dev] Stack Frames as Pseudo-Objects
I have delivered the first part of an enhancement for
https://bugs.eclipse.org/bugs/show_bug.cgi?id=581644 - Allow stack frames as pseudo-objects for HPROF snapshots
The HPROF parser now has an option to create pseudo-objects for the stack frames. The stack frames can then appear in paths to GC roots etc. as the thread has references to the stack frames and the stack frame has references to its local variables.
The type of the pseudo-object can be '<stack frame>' and a few extra types are created to avoid disturbing the normal object hierarchy. In another mode, we group the stack frames by type based on the method that is being executed for that frame. From the histogram
you can then quickly see which methods are being executed across the whole snapshot. These options have existed for DTFJ since 2011, and this bug gives the HPROF equivalent.
There are more details in the bug - please comment there or here if you want more visibility.
Andrew Johnson
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