TF-1/RP3 was Languages vs. machines The need for D-scussion

Eugene N. Miya eugene at pioneer.arpa
Wed Mar 30 03:28:50 AEST 1988


In article <1247 at PT.CS.CMU.EDU> edw at IUS1.CS.CMU.EDU (Eddie Wyatt) writes:
>Stats on TF3
>
>  Canidates for this beast include NASA.  Does anyone at NASA
>want to comment?

My comment: you are confusing the TF-1 (teraflops-1) and the RP-3
(research parallel processor project).  There are probably several dozen
candidate sites for these machines, all places with multiple
supercomputers (like the new SDI Testbed, why don't you ask Livermore,
Los Alamos, Sandia, etc.).  It is not appropriate to
discuss subjects like this on the net which may be in negotiation.

>From the Rock of Ages Home for Retired Hackers:

--eugene miya, NASA Ames Research Center, eugene at ames-aurora.ARPA
  "You trust the `reply' command with all those different mailers out there?"
  "Send mail, avoid follow-ups.  If enough, I'll summarize."
  {uunet,hplabs,hao,ihnp4,decwrl,allegra,tektronix}!ames!aurora!eugene

Newsgroups: comp.lang.c,comp.arch
Subject: Re: Languages vs. machines (was Re: The need for D-scussion)
Summary: 
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Newsgroups: ba.general
Subject: Re: Recomondation for Dentists
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Newsgroups: comp.lang.fortran
Subject: Re: Fortran 8x, recursive procedures
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In article <2243 at ttrdc.UUCP> levy at ttrdc.UUCP (Daniel R. Levy) writes:
>In article <522 at a.UUCP>, jlg at a.UUCP (Jim Giles) writes:
>[possible reasons why RECURSIVE keyword is still in F8x]
>#                        ...in spite of the introduction of SAVE in Fortran
># 77, many Fortran environments have not fully implemented stack-based code.
># Since stack-based code is absolutely required for recursion to work, the
># committee wanted to make it possible for the compiler to generate stack
># references ONLY for the recursive procedures.  Non-recursive procedures
># would continue to work as before (and without the stack references they
># might run slightly faster).
>
>Plain-vanilla UNIX f77 (not exactly a paradigm of efficiency) will, in fact,
>produce significantly faster and somewhat smaller code when stack references
>are forced (via the extension storage class AUTOMATIC) than the default,
>where it will use static data.  It is faster on many machines to reference
>memory indexed with small offsets from a register (i.e. the stack pointer)
>than it is to reference it by absolute address.  So, stack-based code
>is a win-win situation with respect to both efficiency and recursion.
>-- 
>|------------Dan Levy------------|  Path: ..!{akgua,homxb,ihnp4,ltuxa,mvuxa,
>|         an Engihacker @        |  	<most AT&T machines>}!ttrdc!ttrda!levy
>| AT&T Computer Systems Division |  Disclaimer?  Huh?  What disclaimer???
>|--------Skokie, Illinois--------|

Newsgroups: comp.lang.c,comp.arch

Subject: Re: TF-1/RP3 was Languages vs. machines The need for D-scussion
Summary: 
Expires: 
References: <12176 at brl-adm.ARPA> <1988Mar11.215238.976 at utzoo.uucp> <1394 at eneevax.UUCP> <1247 at PT.CS.CMU.EDU>
Sender: 
Reply-To: eugene at pioneer.UUCP (Eugene N. Miya)
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In article <1247 at PT.CS.CMU.EDU> edw at IUS1.CS.CMU.EDU (Eddie Wyatt) writes:
>Stats on TF3
>
>  Canidates for this beast include NASA.  Does anyone at NASA
>want to comment?

My comment: you are confusing the TF-1 (teraflops-1) and the RP-3
(research parallel processor project).  There are probably several dozen
candidate sites for these machines, all places with multiple
supercomputers (like the new SDI Testbed, why don't you ask Livermore,
Los Alamos, Sandia, etc.).  It is not appropriate to
discuss subjects like this on the net which may be in negotiation.

>From the Rock of Ages Home for Retired Hackers:

--eugene miya, NASA Ames Research Center, eugene at ames-aurora.ARPA
  "You trust the `reply' command with all those different mailers out there?"
  "Send mail, avoid follow-ups.  If enough, I'll summarize."
  {uunet,hplabs,hao,ihnp4,decwrl,allegra,tektronix}!ames!aurora!eugene



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