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From Tim Ellison <t.p.elli...@gmail.com>
Subject Re: [performance] performance measurement of HDK
Date Wed, 09 Aug 2006 08:35:02 GMT
Rana Dasgupta wrote:
> Before tracking detailed EM/JIT profiling information( which we may need at
> some point ), it may be useful to initially just track benchmark raw scores
> weekly to see overall progress/regression and make it publicly available.
> If there are licensing issues with SpecJVM and SpecJBB, we could use a
> broad
> public suite like JavaGrande. We could just run this externally weekly
> on the same reference machine and post the numbers.

I think it will be interesting to do both if we can.  Different people
will get different things from the profiling and benchmark scores and I
think both are useful.  Capturing the data regularly gives us history to
help track down any regressions.

The build machine at IBM has the logs for loads of Harmony builds now,
it would be interesting to plot the JUnit reported times for each test
run across all the builds and see how they have changed.

> We need to decide what we want to use  benchmarks for. If it to be used
> internally primarily for performance health, we could consider requiring
> reporting before and after scores as part of JIRA code submissions along
> with smoke test logs.

No, JIRA issues should be zero cost to create, we want to encourage
everyone to raise lots of relevant issues.  Don't put hurdles in their way.

As i said above, I believe the performance measurements will be used at
differing levels of analysis by people in Harmony.

> For this, in addition to the jitted code oriented ones like Linpack,
> Scimark, we also need the memory benchmarks like decapo. We could
> also start filing perf bugs. But given that DRLVM will change 
> significantly for some time, it seems too early to do this.

Do you mean the MMTk work?  I don;t know what the timeline is for that
but in the meantime fixing performance problems as they are uncovered
makes sense doesn't it?

> To report/publish competitive scores we will need the rights to run
> specJVM98, specjbb2005, specjAPPServer etc. In addition to licensing, this
> also has some minimal infrastructure needs. Again, we can do do the prep
> work, but it maybe  too early to post competitive scores.

I agree it is too early, there are enough benchmarks to keep us going.


> Thanks,
> Rana
> On 8/2/06, Mikhail Fursov <mike.fursov@gmail.com> wrote:
>> In my opinion this is a very good idea to have public performance profile
>> with a hotspots identified.
>> So, if this idea is accepted by community we can start a discussion which
>> kind of profile might be useful.
>> I know that execution manager and optimizing JIT in DRLVM have a command
>> line keys to dump a lot of useful profiling information. I hope that
>> other
>> components have such switches too. So the only thing we need to do first
>> (if
>> the your proposal is accepted) is to write a tool to parses this data and
>> shows as webpage. I can help to anyone with this task (importing profile
>> from DRLVM JIT/EM) or just find a time and do it by myself if no
>> volunteers
>> will be found..
>> On 8/2/06, Stefano Mazzocchi <stefano@apache.org> wrote:
>> >
>> > one thing that happened in mozilla-land that catalized the community in
>> > fixing leaks and performance issues was adding profiling information to
>> > the tests and start plotting them overtime.
>> >
>> > Not only that gives an idea of the evolution of the program performance
>> > overtime, but it also keeps people honest because profiling is not
>> > something that should be done once and being forgotten but something
>> > that should be considered part of the feature of the program.
>> >
>> > --
>> > Stefano.
>> >
>> >
>> -- 
>> Mikhail Fursov


Tim Ellison (t.p.ellison@gmail.com)
IBM Java technology centre, UK.

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