Re[2]: Unanswered questions

From: Andreev Nikita (
Date: Sun Apr 26 2009 - 20:53:53 PDT

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    Thank you, Paul.
    You are the developers and apparently you are the most competent guys
    in that field. So you are the first place to ask for advice.
    At least now I have starting point to go from and search in docs, google, etc.
    Thank you again,
    > Andreev Nikita wrote:
    >> Hi, guys.
    >> I sent you two letters at 17 and 18 of April. But haven't received any
    >> reply.
    >> Anything wrong with them? A can provide any clarification if needed. I
    >> really need to know answers to these questions.
    >> All the best,
    >> Nikita.
    > Nikita,
    > I believe you are referring to the two messages I quote below.  If that
    > is the case, then I believe you have received no reply because nobody 
    > here knows an answer.  I, for instance, know very little about GASP 
    > other than by reading the documentation (which you appear to have done a
    > better job of than I).  I also do not keep track of who is using our 
    > software for what projects.
    > In partial response to the question of UPC rising in popularity: I can
    > say that both IBM and Cray appear to be taking UPC seriously when they
    > are designing and marketing their machines.
    > With respect to line and column numbers w/ GASP, I would guess that the
    > --line-comm-stats flag to ppwrun may be required.  I didn't reply 
    > earlier because that is just a guess.  If you are using GASP w/o PPW, 
    > then I have no guess at all.
    > Perhaps others could step up and provide some answers?
    > -Paul
    >> *From:* Andreev Nikita (/
    >> *Date:* Thu Apr 16 2009 - 19:12:00 PDT
    >> Hello.
    >> Thanks Paul for clear previous answers.
    >> I want to know if there is any evidence of rising PGAS popularity in
    >> HPC field. Could you provide list of big clusters and projects where
    >> PGAS languages is being used (as much as possible).
    >> I would really appreciate that.
    >> Thanks in advance,
    >> Nikita.
    >> *From:* Nikita Andreev (/
    >> *Date:* Sat Apr 18 2009 - 04:13:56 PDT
    >> Paul,
    >> >> 2. In GASP split-phase barrier consists of two events: GASP_UPC_NOTIFY 
    >> >> and GASP_UPC_WAIT. How does upc_fence and ordinary barrier appears in 
    >> >> trace? There are GASP_UPC_BARRIER and GASP_UPC_FENCE but it turns out 
    >> >> that same GASP_UPC_NOTIFY and GASP_UPC_WAIT are being used.
    >> >
    >> > This I am not sure about.  I would expect that the fence should NOT be 
    >> > generating the NOTIFY and WAIT GASP events.  If you have a simple example 
    >> > that you are sure is not seeing the GASP events implicit final barrier, 
    >> > please share it and we can take a look at it.
    >> It seems to me that in current GASP implementation in Berkeley UPC 
    >> translator fence as long as ordinary barrier generate NOTIFY and WAIT 
    >> events. Application and trace it generates are in enclosure. You can see 
    >> many ordinary barriers and fence in code but you won't see neither 
    >> GASP_UPC_BARRIER nor GASP_UPC_FENCE in trace file.
    >> And another question. Does GASP in Berkeley UPC translator support filename, 
    >> linenum and colnum args of gasp_event_notify event? As you can see in trace 
    >> file I provided linenum and colnum are always 0 and filenum equals to some 
    >> odd values.
    >> All regards,
    >> Nikita. 

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