[Nek5000-users] survey of apps

[nek5000-users at lists.mcs.anl.gov]

Dear Neks,

As part of a strategic planning exercise, I'd like to
get a survey of performance profiles over a broad range
of applications.  I'm particularly interested in production
runs involving lots of compute cycles, since these would
be the most important for future optimization (i.e., cases
where you are running 100s of simulations of more or less
the same type).   I'm wonder if I could ask each of you
to send one or at most two logfiles directly to me -

fischer at mcs.anl.gov

with a very brief description giving a ballpark estimate
of utilization, i.e., something like:

We have run 100 of these cases, typically 6 hours each, or
whatever suits.  I don't really need to know anything about
the app.

The one thing I do need, however, is that your logfile contain
the statistics that are printed at the end when the job terminates
with nek's standard termination criterion (i.e., it does not stop
because your run time expired).   When you

grep time logfile

you should see something like:

163.0805685520172       7.9530425400815632E-002
  eslv time      121259   153.8100430965424       7.5009415695555526E-002
  pres time      121259   433.6815834045410       0.2114959564030525
  crsl time      122729  0.7530927658081055       3.6726501852911642E-004
  hmhz time      363777   469.4056932926178       0.2289177355990086
  spro time      121260   14.56137013435364       7.1012259246232062E-003
  usbc time      606294   54.14203882217407       2.6403755014022586E-002
  axhm time     2070607   497.7768969535828       0.2427536813301520
  advc time      363777   252.1085748672485       0.1229472179574250
  vdss time      486498   7.609275102615356       3.7108583277339125E-003
  dsum time     2438769   18.98749208450317       9.2597379085877490E-003
  dadd time           0   1.966142654418945       9.5883993472067994E-004
  ddsl time      122729   49.81083679199219       2.4291533165547920E-002
  solv time      122729   22.48464226722717       1.0965212964212575E-002
  prep time      121259   10.51901149749756       5.1298659712803868E-003
total elapsed time             :   2.05059E+03 sec
total solver time incl. I/O    :   2.05054E+03 sec
time/timestep                  :   1.69104E-02 sec
CPU seconds/timestep/gridpt    :   4.23184E-06 sec


Preferably, the case in question should be 3D and have run
for at least 100 timesteps (the more the better), so that
the statistics have more significance.

My plan is to build a histogram with pts/core on the x-axis, time
spent where on the y axis, etc.  --- something like this... By 
gathering this on a variety of platforms we'll be able to make more
informed decisions.

Thank you all!

Paul