Justin, to be honest I think Julia parallelism is in an early stage. I think you would be better to talk directly with the language founders. A good place for discussions is at: https://discourse.julialang.org/
On 18 September 2017 at 18:22, Justin Y. Shi <s...@temple.edu> wrote: > Hi John: > > Thanks for your quick reply. I have been working on fault tolerant > computing for a long while. Given Julia's recent successes, I am curious > about how it's designer had tackled the scaling challenge. > > In other words, we knew that end-to-end computing paradigms are > fundamentally unstable under the lens of extreme scale computing. I am > always interested in the extremes when the envelope MTBF (mean time between > failures) can be pushed. > > Justin > > On Mon, Sep 18, 2017 at 4:22 AM, John Hearns via Beowulf < > beowulf@beowulf.org> wrote: > >> Justin, I do not know the answer to this question. >> Woudl you kindly elaborate further - do you mean is it necessary to have >> checkpointing with Julia, >> or are you working on checkpointing software? >> >> Not really an answer to this question. Julia uses the LLVM compiler and >> something called multiple dispatch. >> At first sight as a scientist/engineer you will probably throw your hands >> up in horror at the though of multiple dispatch, >> and start wailign that it is wasteful of machine resources and CPU >> cycles. But no, wait and think on... computers are >> pretty powerful these days and disk space (to a first approcxilmation) is >> plentiful. SO read on with an open mind... >> >> https://armchairecology.blog/2017/07/10/julia-in-ecology-why >> -multiple-dispatch-is-good/ >> http://www.stochasticlifestyle.com/type-dispatch-design- >> post-object-oriented-programming-julia/ >> >> So for any function Julia creates separate OPTIMISED code paths for every >> combination of types the function can operate on. >> (ie those types which do not have operators which are able to work on >> them are ruled out). >> Read that again - instead of creating huge code blocks which work with >> any type which you give it, >> separate code blocks with optimised code are produced. (Th is is my >> understanding of how it works). >> >> A consequence of this is that first time through, a Julia program is >> slow. You are cautioned to remember this when benchmarking. >> I have never shot a gun, but if I may bowrrow a term from target shooting >> there is a pretty tight grouping around the C bullseye here >> https://julialang.org/benchmarks/ >> >> >> >> Before anyone throws their teddies away, it is of course perfectly >> possible to produce compiled Julia code. My reading of this is that this is >> not >> a slick process at the moment, and there are efforts ongoing to make this >> easy. >> Though this looks pretty slick to me: >> https://github.com/JuliaComputing/static-julia >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> On 18 September 2017 at 04:08, Justin Y. Shi <s...@temple.edu> wrote: >> >>> Hi John: >>> >>> Do you need to add checkpoints for Julia programs? >>> >>> Just curious. >>> >>> Thanks! >>> >>> Justin >>> >>> On Wed, Sep 13, 2017 at 7:43 AM, John Hearns via Beowulf < >>> beowulf@beowulf.org> wrote: >>> >>>> I see HPCwire has an article on Julia. I am a big fan of Julia, so >>>> though it worth pointing out. >>>> https://www.hpcwire.com/off-the-wire/julia-joins-petaflop-club/ >>>> Though the source of this seems old news - it is a presentation from >>>> this year's JuliaCon >>>> >>>> JuliaCon 2018 will be talking place at UCL in London so mark your >>>> diaries. Yours truly should be there. >>>> >>>> >>>> _______________________________________________ >>>> Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin >>>> Computing >>>> To change your subscription (digest mode or unsubscribe) visit >>>> http://www.beowulf.org/mailman/listinfo/beowulf >>>> >>>> >>> >> >> _______________________________________________ >> Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing >> To change your subscription (digest mode or unsubscribe) visit >> http://www.beowulf.org/mailman/listinfo/beowulf >> >> >
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