DynamoRIO runtime manipulation optimisation example

[Pavel Durov]

Where should I look for examples of DynamoRIO runtime manipulation that results in more performant program execution?

I'm looking for an example of a program that runs slower on its own when compared to a runtime with a DynamoRIO client that does some kind of optimisations to the program.

[sharma...@google.com]

Hi,

A few resources I could find for dynamic optimization:

- Our sample for optimizing increment operation: https://github.com/DynamoRIO/dynamorio/blob/master/api/samples/inc2add.c. I don't think this has been used/tested recently, so if you see issues, please report and we can help.

- See section 9.2 at https://www.burningcutlery.com/derek/docs/phd.pdf which also discusses the above increment operation optimization

- Also see this CGO article https://www.burningcutlery.com/derek/docs/adaptive-CGO03.pdf

Derek and others: please add other examples if I'm missing any.

Abhinav

[Derek Bruening]

Just a cautionary note that achieving a net win with dynamic optimization on today's hardware and compared to today's FDO compilation + post-link optimization is not easy.  Many past successes actually hinged on shortcomings in the hardware or compiler.

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[Pavel Durov]

Thank you.

I assume that FDO is Feedback Driven Optimisation which is the same as Profile Guided Optimisation?
What you mean by "post-link optimization"? Is it the same as "link-time optimisation"?

[Pavel Durov]

Are there any known contemporary use cases of DynamoRIO runtime dynamic optimization used by the industry?