ljdursi

3 ms·

1.
by ljdursi 11y ago
I agree with this, but it also sort of risks being a self-fulfilling prophesy; everyone uses MPI because everyone uses MPI, and no one uses Chapel yet because no one uses Chapel yet. At some point, we who are willing to be early adopters n
2.
by ljdursi 11y ago
Chapel has been used for incompressible moving-grid fluid dynamics, so it's certainly feasible. For that problem the result was ~33% the lines of code of the MPI version. There is a performance hit, but the issues are largely underst
3.
by ljdursi 11y ago
I agree that languages that rely on tracing GC seem like they're fundamentally at a disadvantage when it comes to pushing the envelope of single-node performance; the best article I've read arguing this was actually in the context
4.
by ljdursi 11y ago
I think with GPGPU, the issue is a little different; it's local computation, so a bit orthogonal to distributed-memory coordination. But it is interesting to see how many higher-level libraries and other tools (like OpenMP4/OpenA
5.
by ljdursi 11y ago
"won't be the standard in 10 years, otherwise it will still be the standard in 10 years." -- nicely said.
6.
by ljdursi 11y ago
Oh, sure. I don't think anyone should start rewriting old codes; but as new projects start, I think we have a lot more options out there than we did 10 years ago, and it's worth looking closely at them before starting, rather tha
7.
by ljdursi 11y ago
Thanks! I'm probably mischaracterizing Charm++ a bit, because I'm most familiar with it in particle context (OpenAtom, ChaNGa, NAMD). I guess it's probably particularly used in that context just because it's so good wit
8.
by ljdursi 11y ago
I think coarrays have a lot of promise; it's less ambitious than the single unified picture of a program that Chapel or UPC has, but maybe that's a feature, not a bug, for incrementally changing how we do things. One problem has
9.
by ljdursi 11y ago
Certainly Prof Hoefler has done a lot of work driving the design of updated remote-memory access for of MPI-3, and any further progress would be welcomed; but I don't think any modernizing of MPI can fix the basic problem. At the end
10.
HPC is dying, and MPI is killing it(dursi.ca)
225 points by ljdursi 11y ago|123 comments