Minutes for the Einstein Toolkit, 20241219.
https://docs.einsteintoolkit.org/et-docs/Main_Page#Weekly_Users_Call
9am CST
Present: Steve B, Bill G, Roland H, Maxwell R, Leo Rosa W, Zach E
Chair Steve, Minutes Bill
Last meeting of the year. No meeting on the 26th December nor on the
2nd January. Next call is 9 January 2025.
Steve, looking at MoL recently and it should work with CarpetX if
someone provides linear combination. Roland wonders if tiling is a
problem. Steve pushes back about traversing the schedule versus
traversing the grid. Scratch variables are not grid functions in
ODESolvers. Roland thinks it might well work. Steve, it would be
another capability if people want it. MoL does have a linear
combination routine if nothing overrides it. Roland, could make MoL use
GPUs in this manner.
* Simfactory issues on Anvil [RH]
Roland, Maxwell looking into this. Simfactory for the release gave
1/70th the speed on Anvil. Maxwell used his files and it gave the
expected performance. So something is off on the ones in the toolkit.
Maxwell, my files are not public yet. The diff shows some simple
changes, like modules which he does not expect to make a large
difference, another difference is the amount of make jobs and default
amount of nodes in the .ini file. Nodes is the max number of nodes the
cluster has, a limit. CPU frequency is different too but is purely
information. Make jobs 8 to 4 should not affect it. So seems that
difference is in the modules. Roland asks about the OptionList, and
expects the difference there. Roland, could be off in the runscript.
Maxwell, my machine file use --mpi=pmpi2, was told to do that for some
speedup, pins MPI ranks. Steve suggests changing to the other value.
Roland, you need to Reconfig with scripts but will not re-compile
anything, or copy by hand the runscript in config/sim .
Maxwell, will run more tests to pin down the parameter that affects
the runtime.
* upcoming ET possible inclusions
** NewRadX boundary [CSC]
Did not get the update into the previous release. Needs two changes,
one change to CarpetX and the other to SpacetimeX. See ticket #2820.
** Z4c, high priority needs champion and reviewers [RH]
Erik would like to have a co-champion and Roland can do that.
Reviewers are Steve and Peter. See ticket #2748.
** BHaHAHA horizon finder [ZE]
Zach, paper is being written, sections are finished. Finish the
paper and up on Arxiv before the new year. So on track for the next
release.
** CCE code to hook up to Spectre [RH]
Cauchy Characteristic Extraction code, interpret the cauchy grid for
spacetime evolution and on the null grid, and to ScriPlus that way.
Deborah Ferguson and should be ready soon.
** possibly more modules for cosmology [RH]
Roland, will check if Hailey has anything ready and can champion it.
** gallery examples for Canuda [CSC], Fishbone-Moncrief, IGM, GRHayL and
others [RH]
New gallery examples, two to contribute related to Chen and Deborah
Ferguson, on axidilaton field part of Canuda but not the Toolkit. Like
BNS relies on external package, Proca and Gallery thorns. It has a
picture and text and estimates for runtime.
Fishbone-Moncreif postponed until those thorns have been cleaned up.
Roland, GrHayL or IGM, it would be nice to have gallery examples to
make people aware of other codes in the Toolkit. Could be simple as BNS
example, use with Illionis GMHD and Baikal. Zach, also do with
BHaHAHA. Once McLachlan is updated with improvements, we can update.
* unanswered question on mailing list
https://www.einsteintoolkit.org/tools/unanswered.php
Just advertisements.
* open tickets sorted by update time
https://bitbucket.org/einsteintoolkit/tickets/issues?status=open&status=new&sort=-updated_on
#2837 Building Einstein Toolkit: Roland, Build trouble on a cluster in
Asia. Suggest commenting out thorns you do not use and re-run make
thorn. Steve, have maybe run across something similar. Does he have
pkg-config installed? Zach, reads like an Adios2 compile issue.
Roland, this was fixed by installing cmake on the system...look lower in
the ticket. Looks like libsz is missing. Roland, installing HDF5
usually fixes this. Ticket says solved libsz problem. Trouble on
OpenSuse and Ubuntu still. Needs hdfs5-devel maybe. Roland, Zypper
install helps. Zach, in the Ubunto log bulding with make -j 6 and it is
not finding something. Too many makes in a parallel build can expose
dependency issues and think that is the problem...maybe with the ADIOS2
build system. Recommends trying -j 1...and wait. Perhaps OpenSUSE is
the same/similar issue. Steve, could be something funny with ADIOS2,
Steve installs it first with Spack.
#2835 add backtrace functionality from CarpetLib: Erik has reviewed
part of it. Moved some of the code to CarpetX. Code same as in
CarpetLib. Parameter files in test directory do not have output files,
and testing segfault all end in failures...Toolkit test system should
support expected failure as an outcome. This looks underway.
#1566 Update Cactus autoconf: Roland will apply it 2024-12-26.
#2807 Hydro_RNSID passes CFLAGS to LD: Roland will apply this after
2024-12-26.
#2836 add support for different data types to GPU arrays: Roland, Erik
found some needed fixes. About how the Poison value is handled, set
memory to poison, etc. Can discuss the proper poison value. Steve, is
it NAN17? Roland, currently NANxxx, can use anything. Add doubles,
floats, ints, complex8 and complex16, etc, the ones that CarpetX supports.
* tickets ready for review
https://bitbucket.org/einsteintoolkit/tickets/issues?status=new&status=open&sort=-updated_on&q=Please%20review
* Any Other Business
Maxwell, discussed support for volume integrals in Kuibit on a Telegram
channel. Steve uses Telegram heavily, communicate and to tell him about
builds. Because it is using its own output, volume integral output is
different than the standard Cactus output, so needs its own custom
interpreter. Kuibit lets you do parsing flexibly. Gabrielle started by
parsing headers for Kuibit. Zach, Python is a good language for this.
In the Toolkit there are a lot of ways to do this. Needs to be able to
interpret the strings and what are the important information. Zach,
issue is the communication of the output you start with a full domain
and then you have spherical volumes from that domain...support swiss
cheese type topologies. Do not need to do too much in Kuibit. Maxwell,
Gabrielle wanted to be able to change the configuration mid-run as
people often do, so want to follow the mid-run changes in output.
From Roland, a negative about Telegram
https://www.bbc.com/news/articles/cvgrvw29x4jo
"The social media platform Telegram uses an algorithm that promotes
extremist content, a new study shared exclusively with the BBC has
revealed."
Next meeting 9 January 2025:
Chair Leo
Minutes Roland
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