Present: Vassili, Peter, Erik, Ian, Philipp, Yosef
* goals for next release ** suggestion: improve scaling and performance of (hydro) code ** start discussion on mailing list
* multi-line error messages ** suggestion that write(,) with proper unit numbers might be workable ** Fortran 2003 defines standard module ISO_FORTRAN_ENV which defines the error and output unit numbers. Seems to exist on ifort and gfortran (starting from 4.6)
* performance improvement goals for workshop ** single processor speed improvements ** speed up GRHydro ** consider using OpenCL for at least some tests ** scaling and load balancing of Hydro code compared to vacuum code ** improve restriction and prolongation scheduling and communication
* hangs on stampede ** Yosef tested with and without the parity symmetry thorn ** there are two failure modes and both are seen by Yosef even when not using the thorn
* M_PI not defined by default in c99 * M_PI not defined in c99. Defined by C++ and OpenCL, usually can be made accessible by special compiler options. ** possible solutions: *** check in autoconf that M_PI is defined and abort if not *** define M_PI if not defined *** add CFLAGS options in Cactus' configure stage, requires most likely a new option BASE_CFLAGS to let users override the Cactus default. Provide only support for common (intel, gcc) compilers only. ** the last solution (CLAGS set by Cactus' configure stage) is the preferred method right now
* misc ** feature request to have CarpetRegrid2 check that its grid scalars are consistent on all processes
Yours, Roland
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Hello all,
On 2013-06-10 10:50, Roland Haas wrote:
Present: Vassili, Peter, Erik, Ian, Philipp, Yosef
I forgot to put into the minutes that there was also the suggestion of moving to a different conferencing system other than the current one (eg a web based one offering chats and/or screen sharing). No consensus was reached. If possible I would however very much like to avoid using WebCT until the company has fixed their compatibility issues with 64-bit linux installations. Currently one has to install a 32bit copy of java and a browser to make it work under linux. We tried this once for Christian Reisswig's seminar talk and it was rather difficult. Once these issues are fixed, the system seems quite nice. The big advantage (over other, open-source solutions) would be that it should allow phone-line call-ins out of the box. An alternative web-only solution is to use the BigBlueButton server that Frank Loeffler runs at http://bbb.cct.lsu.edu/demo/ET.jsp However I find the chat function there to be not so great. Screen sharing works but only one person can share her screen. Finally calling in from a phone is not possible out-of-the-box (though possibly LSU can do something about that).
Yours, Roland
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Roland Haas