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From Naveen Neelakantam <neela...@uiuc.edu>
Subject Re: [drlvm][jit] replay compilation methodology
Date Fri, 25 Apr 2008 14:14:44 GMT

On Apr 25, 2008, at 8:35 AM, Egor Pasko wrote:

>> The problem is that a staged optimizing-compiler (e.g. server.emconf)
>> can make it difficult to isolate the performance effects of a
>> particular compiler optimization or GC algorithm because the compiler
>> runs concurrently with the application/GC.
>>
>> A reasonable solution to this problem is the following:
>> 1) Run the application with the staged compiler enabled and collect a
>> log of its actions.
>> 2) When measuring performance, run the application twice in a row,
>> within the same JVM instance.  During the first run the JVM consumes
>> the log produced in (1) and uses it to optimize the code exactly the
>> same as in (1).  During the second run the compiler is disabled and
>> measurements are made.
>
> then just dump profile at EdgeProfilerAnnotationPass and then reload
> in (2). Should solve the problem, IMHO.

Really?  That seems insufficient because of value-profile-based  
devirtualization.  The edge profile is only part of the story right?

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