On Mon, Sep 14, 2015 at 7:45 AM, Koos Huijssen <[email protected]> wrote:

Dear PETSc development team,

We have developed an extension of the PETSc event logging facilities that has the following advanced features:

- It allows logging of events in the form of a nested tree. So if some function is called from multiple locations in the code, these instances are distinguished. This in contrast with the standard event logger, which only logs the amount of total call time.

How is this different from using stages?

- It allows the output report to be formatted in XML format. This output can then be viewed in a human-friendly form in a web browser with the use of the XSL Transformation script performance_xml2html.xsl. The html features an nested timings tree that can be expanded and collapsed as desired.

This sounds fine and useful. We will look at the code. Thanks, Matt

This tool has been very useful for us to analyze the code and pinpoint performance bottle necks. We think that it can be useful for others as well, and therefore we are providing the code here for integration in the open source distribution of PETSc.

For more information I refer to the included manual. We have also provided a test program and a makefile for convenience. The test program can be run using MPI with for instance 3-6 processes.

I apologize for not using the git repo to submit the developed code. I also apologize for not adhering to the PETSc coding standards (or at least not as far as I know), but I hope that it is not too far off.. Apart from the whole capital/underscore standardization stuff one issue may require special attention, namely the (ab)use of the format PETSc_VIEWER_ASCII_IMPL for signaling the XML format in XMLViewer.c. I couldn't find an already existing and better fitting format, but it could be necessary to add a new format here for this purpose.

Can you take it up from here and realize the integration of the code in the PETSc distribution?

With kind regards,

Koos Huijssen

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VORtech BV - Scientific software engineers ____________________________________________________________________

Dr.ir. Koos Huijssen

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-- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener