[petsc-users] Question about LogSummary

Sun Mar 24 08:42:02 CDT 2013

On Mar 23, 2013, at 11:50 PM, Matthew Knepley <knepley at gmail.com<mailto:knepley at gmail.com>>
 wrote:

On Sun, Mar 24, 2013 at 12:24 PM, Blaise A Bourdin <bourdin at lsu.edu<mailto:bourdin at lsu.edu>> wrote:
Hi,

I am trying to do some scaling tests but can't figure out something about LogSummary: When no custom stages / events are defined, how come "Main Stage" is not 100% of the time? What is not counted? Here is a example of what I get:

Library loading?
Really? Is there anything I can do to test if it really is library loading or to reduce loading time? I am attaching the full log summary
Blaise

   Matt

Summary of Stages:   ----- Time ------  ----- Flops -----  --- Messages ---  -- Message Lengths --  -- Reductions --
                        Avg     %Total     Avg     %Total   counts   %Total     Avg         %Total   counts   %Total
 0:      Main Stage: 2.5763e+03  65.1%  3.2380e+15 100.0%  1.230e+11 100.0%  8.493e+02      100.0%  7.013e+06  97.0%

Where is the missing 35% of the time? I call PetscLogBegin right after PetscInitialize.

Blaise

--
Department of Mathematics and Center for Computation & Technology
Louisiana State University, Baton Rouge, LA 70803, USA
Tel. +1 (225) 578 1612<tel:%2B1%20%28225%29%20578%201612>, Fax  +1 (225) 578 4276<tel:%2B1%20%28225%29%20578%204276> http://www.math.lsu.edu/~bourdin

--
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

--
Department of Mathematics and Center for Computation & Technology
Louisiana State University, Baton Rouge, LA 70803, USA
Tel. +1 (225) 578 1612, Fax  +1 (225) 578 4276 http://www.math.lsu.edu/~bourdin

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