[Trilinos-Users] [EXTERNAL] Anasazi timers

[Thornquist, Heidi K]

Hi David,

The global-participation requirement comes from the Teuchos::TimeMonitor class, if summarize() is called without a communicator, and Anasazi is agnostic of the underlying communicator.
You can enable the timers for Anasazi, but you cannot ask the eigensolvers' verbosity to include "Anasazi::TimingDetails".  Instead, after the solve() method has returned, you can call Teuchos::TimeMonitor::summarize with the sub-communicator that you are using for that solve.  This is explained in the Teuchos documentation here:

http://trilinos.org/docs/dev/packages/teuchos/doc/html/classTeuchos_1_1TimeMonitor.html#a943add952f1c75ed13ce6a95a092e942

Please let me know if you have any further questions.

Thanks,
Heidi

--

Heidi K. Thornquist
Electrical Models & Simulation
Sandia National Laboratories
Albuquerque, NM  87185-1323


From: <Hysom>, "David A." <hysom1 at llnl.gov<mailto:hysom1 at llnl.gov>>
Date: Sunday, January 4, 2015 3:29 PM
To: "trilinos-users at software.sandia.gov<mailto:trilinos-users at software.sandia.gov>" <trilinos-users at software.sandia.gov<mailto:trilinos-users at software.sandia.gov>>
Cc: "ayoo at llnl.gov<mailto:ayoo at llnl.gov>" <ayoo at llnl.gov<mailto:ayoo at llnl.gov>>
Subject: [EXTERNAL] [Trilinos-Users] Anasazi timers

Happy new year, all!

We are writing an asynchronous eigensolver-based code.
By "asynchronous" I mean: we spin off a group of processors that
runs Anasazi on one matrix; a second group that simultaneously
runs Anasazi on a second matrix; etc.

In our serial prototype
we my analyzing runtime performance using the Anasazi/Teuchos
timers. However, these apparently assume that all processors in
MPI_COMM_WORLD participate in every solve. Since this was not
our case, our code hung.

We got around this by compiling Trilinos without the timers.
So our code now works -- but we can't get the timing breakdown
for the various solve stages that we'd like.

So my question is: is there any reasonably easy way to modify Anasazi
to get rid of this global-participation requirement?

thanks, David
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