[Users] Meeting Minutes for 2020-04-02

Bill Gabella b.gabella at vanderbilt.edu
Thu Apr 2 11:06:53 CDT 2020

Present: Steve B, Roland H, Yosef Z, Zhichao Z, Maria H, Liu H, 
Christopher E, Alois Peter S, Beyhan, Zach E, Helvi, Kadri Y

Chair: Steve Minutes: Bill  (Helvi next week, April 9th)

SB-Ian Hinder is working on replacement for cactuscode.org, 
test.cactuscode.org. Please take a look, make comments.

SB-What do we use SVN for? External libs, but they are on github / 
bitcode.  RH-High GW Analysis is on those SVN servers.  We could make a 
Git copy of it. SB nice to get rid of another server.

* update on potential codes to be included in next release, from minutes 

** BaikalETK (Zach, Helvi)

   ZE-Intel17 performance regression, Zach looking into it and could not 
fix, but no problem with Intel19. Baikal on Intel19 is faster than 
McLachlan with GCC.  Slowest of the four is McLachlan with GCC which is 
20% slower running on one high HPC node and 4 MPI processes.  Did not 
test Intel18, no access.  For performance, have to disable dependency 
checking with vectorization...in Intel17 causes the compiler to 
segfault---does give warning message.  For Intel19 these problems are 
resolved.  Zach did put in a #ifdef and it will compile with Intel17 but 
performance is half what it should be.

   Baikal is in a much better state than a week ago.

NRPy can now reliably generate C code kernels in parallel in ~6 minutes 
on an older i7 machine. Zach fixed a problem whereby sometimes the 
parallel codegen didn't work, resulting in a fallback serial codegen 
mode being called and serial codegen could take ~ an hour.

   It would be good to know which clusters are using the older Intel 

Helvi is official reviewer.  Zach says ready for Helvi's review.

SB-ETK proposal was awarded for another 4 years!

**PreSync (Steve, Roland)

   SB-Not a lot to say about PreSync.  Adding the missing deps from 
Giraffe.  RH-I am reviewing it and finding where things break, a lot of 
places to fix things.

* timeline of upcoming release[RH] 

   Release data listed as May 31st, a Monday.  Previous dates have 
shuffled around. Do not put off work for the release, we are all busy 
with many things.

* Release of testsuite results 

SB has not moved Docker images around yet.  RH-Found likelihood to get 
code to hang on Comet, not always the same.  LLama patch 7 test, 
infinite loop by malloc, provided by the MPI lib.  Not always error at 
the same code place.  Using OpenMPI on Comet, and seems to work.  
Typical mpi is Intel, OpenMPI or MPIch, not typical is MVAPICH2 which is 
on Comet.

**bugs of severity major or worse 

**trivial or minor bugs tagged for the next release 

**other open tickets flagged for next release 

RH-New tickets are mostly related to PreSync.

*gallery testing: tasks 

** volunteers needed, please volunteer (someone)[RH]

**TOV: Brock Brendal (UIUC)

**BNS: Shawn Rosofsky (UIUC)

**BBH: A. Peter S., Runs fine on one system, but some units problem.

**Poisson: Gabella (Vanderbilt)

**Multipatch scalar wave: TBD Let us find someone!!

SB-Has a Python script RunOne that will run one of the tests at a time.  
It is useful.  Shows the MPI command and you can re-run just it. He can 
make it available.

SB-Replacement machine for the tutorial server.  Quote from Dell on a 
little workstation, maybe 16 cores and 32 GB Ram and Jupyter hub could 
be on that.  Wants it to be its own machine because of the security 
risk, and wants it walled off in its own box.  We have some overhead 
funds at LSU that we might be able to use.  The current server is still 
running, but not ideal.

* Unanswered question on mailing list

Scalar fields email, Zach had a Skype with him.  Helvi might show her 
code that couples scalar field to other.

* Open Tickets

*Tickets ready for review

SB ETK workshop, 3-7 August 2020 at LSU, kept the announcement, and 
unsure if it will happen or not.  Looking for lecturers and tutors.

William Gabella
Research Assistant Professor
Department of Physics and Astronomy
Vanderbilt University
Nashville, TN  USA

b.gabella at vanderbilt.edu
(o) 615-343-2713

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