Groups > alt.folklore.computers > #227173

Re: Emulating vintage computers

From	Lynn Wheeler <lynn@garlic.com>
Newsgroups	alt.folklore.computers
Subject	Re: Emulating vintage computers
Date	2024-09-28 14:01 -1000
Organization	Wheeler&Wheeler
Message-ID	<87r0931g66.fsf@localhost> (permalink)
References	(3 earlier) <mlXIO.214174$FzW1.212358@fx14.iad> <vd44mj$8noc$1@dont-email.me> <87tte2s1hu.fsf@localhost> <vd93uj$3tl1n$1@paganini.bofh.team> <87v7yf1iw7.fsf@localhost>

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emulation trivia

Note upthread mentions helping endicott do 138/148 ECPS ... basically
manual compiling selected code into "native" (micro)code running ten
times faster. Then in the late 90s did some consulting for Fundamental
Software
https://web.archive.org/web/20240130182226/https://www.funsoft.com/

What is this zPDT? (and how does it fit in?)
https://www.itconline.com/wp-content/uploads/2017/07/What-is-zPDT.pdf

More recent versions of zPDT have added a "Just-In-Time" (JIT) compiled
mode to this. Some algorithm determines whether a section of code should
be interpreted or whether it would be better to invest some more initial
cycles to compile the System z instructions into equivalent x86
instructions to simplify the rocess somewhat). This interpreter plus JIT
compiler is what FLEX-ES used to achieve its high performance. FLEX-ES
also cached the compiled sections of code for later reuse. I have not
been able to verify that zPDT does this caching also, but I suspect so.

... snip ...


-- 
virtualization experience starting Jan1968, online at home since Mar1970

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Re: except what, is Vax addressing sane today scott@alfter.diespammersdie.us (Scott Alfter) - 2024-09-25 17:01 +0000
  Emulating vintage computers Lars Poulsen <lars@beagle-ears.com> - 2024-09-26 10:12 -0700
    Re: Emulating vintage computers David Wade <g4ugm@dave.invalid> - 2024-09-26 18:44 +0100
      Re: Emulating vintage computers "Kurt Weiske" <kurt.weiske@realitycheckbbs.org.remove-nnv-this> - 2024-09-27 07:43 -0700
        Re: Emulating vintage computers D <noreply@mixmin.net> - 2024-09-27 17:00 +0100
    Re: Emulating vintage computers Lynn Wheeler <lynn@garlic.com> - 2024-09-26 08:39 -1000
      Re: Emulating vintage computers antispam@fricas.org (Waldek Hebisch) - 2024-09-28 14:30 +0000
        Re: Emulating vintage computers Lynn Wheeler <lynn@garlic.com> - 2024-09-28 13:02 -1000
          Re: Emulating vintage computers Lynn Wheeler <lynn@garlic.com> - 2024-09-28 14:01 -1000
            Re: Emulating vintage computers John Ames <commodorejohn@gmail.com> - 2024-09-30 11:04 -0700
              Re: Emulating vintage computers drb@ihatespam.msu.edu (Dennis Boone) - 2024-10-01 00:24 +0000
          Re: Emulating vintage computers antispam@fricas.org (Waldek Hebisch) - 2024-09-30 03:43 +0000
            Re: Emulating vintage computers Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-09-30 03:50 +0000
              Re: Emulating vintage computers antispam@fricas.org (Waldek Hebisch) - 2024-09-30 10:37 +0000
    Re: Emulating vintage computers Bill Findlay <findlaybill@blueyonder.co.uk> - 2024-09-27 23:59 +0100
      Re: Emulating vintage computers geodandw <geodandw@gmail.com> - 2024-09-28 01:43 -0400
    Re: Emulating vintage computers antispam@fricas.org (Waldek Hebisch) - 2024-09-28 15:18 +0000

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