[Users] Einstein Toolkit Meeting Reminder

[Frank Loeffler]

On Mon, Nov 21, 2016 at 12:26:59AM -0600, Frank Loeffler wrote:
>Please consider joining the weekly Einstein Toolkit phone call at

The following group called in:

Cosima (and a few others from the Frankfurt group;
        I don't remember your names, sorry)
Erik
Frank
Harry
Ian
Peter
Roberto
Vassili
Yosef
Zach

One topic was how to optimized a geodesics iteration thorn written by 
Ian Hinder et.al., and now used by the Frankfurt group. The main problem 
is that it was written with a few geodesics in mind, but should now be 
used for millions. Erik strongly suggests to profile what exactly is 
slow before starting to heavily optimized what you might think is slow. 
Assuming it is communication, he gave a few hints which functions might 
help (locatePosition?).

Connected to this it was mentioned that integrating GAs is currently 
broken if you have more than one component per process, as they are 
currently integrated (by MoL) fore each component. Current workaround: 
use more processes (to get 1 component per process).

Release related issues:

- Llama was added to the thornlist, including testsuites
- initial test results look quite good
  (a few failures from usual suspects)
- Intel 17 compiler crashes on bbox.cc in Carpet.
  - current workaround: lower optimization of that file to -O1
  - maybe better: use bbox1-class instead of newer bbox2 class.
                  however: you will have worse scaling for large runs
  - current machines showing this problem: marconi, stampede-knl
- Only a few machines saw testing so far. We need more!

A first shot at a new design of the ET pages is online:

  http://einsteintoolkit.org/new/

These aren't polished yet, but should give a first impression. They are 
responsive, i.e., they should look presentable also on small screens 
(phones). When you test them, please use different browsers, different 
font sizes (zoom levels), different window sized, and different devices.

Please send feedback either to the list, or directly to Frank 
<knarf at cct.lsu.edu>.

Frank

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