EBMethodProfile is an Entry and Backedge profile. I think in
practice it is used by JET and has one counter that keeps track of
the number of times a method has been entered and has one counter
that keeps track of the number of times any backedge has been
executed in a method. If either counter exceeds a threshold,
recompilation is triggered
EdgeMethod profile is an edge profiler. It instruments method entry
and CFG edges to collect the profile (edge_instrument). If any edge
exceeds a backedge threshold or the entry counter exceeds an entry
threshold, recompilation is triggered. During recompilation the edge
annotation (edge_annotate) pass can be used to annotate the CFG with
the collected edge profile. See server.emconf for an example of how
to use edge_instrument and edge_annotate.
Also, you might want to look here:
http://harmony.apache.org/subcomponents/drlvm/EM.html#PC
http://harmony.apache.org/subcomponents/drlvm/emguide.html
Hope that helps!
Naveen
On Feb 26, 2007, at 8:42 PM, yuyu liu wrote:
Hi, I can't get the differences between EBMethodProfile and
EdgeMethodProfile.In which occassions and by what means do they
work?And
how to start any of them?
