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Re: DTC

From anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups comp.lang.forth
Subject Re: DTC
Date 2012-11-29 14:30 +0000
Organization Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID <2012Nov29.153018@mips.complang.tuwien.ac.at> (permalink)
References (5 earlier) <3_idnYfdWuwR3ivNnZ2dnUVZ8tadnZ2d@supernews.com> <2012Nov28.181355@mips.complang.tuwien.ac.at> <25KdnaK6jvpvzCvNnZ2dnUVZ8radnZ2d@supernews.com> <2012Nov28.191254@mips.complang.tuwien.ac.at> <DMOdnf90lcNYxSvNnZ2dnUVZ8rqdnZ2d@supernews.com>

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Andrew Haley <andrew29@littlepinkcloud.invalid> writes:
>Anton Ertl <anton@mips.complang.tuwien.ac.at> wrote:
[...]
>In the case above it does not matter whether the constant is
>implemented with a separate data field or not: there will be a
>slowdown if a variable is written in the same cache line as the code.
>What does matter is where you put the data for the variable, not the
>data for the constant.

Certainly.  Traditionally Forth systems have just one space where they
put things, and that tradition persists even into native code systems,
even to this day (although some have been fixed).  So a DTC system
will likely have just one space, too, and will run into this problem.

You are right though, that ITC-emulating DTC systems will have this
problem anyway.  Primitive-centric systems to a lesser degree (only
for EXECUTE etc.), and hybrid direct/indirect threaded systems only
for CODE words.

>> No, the code and the data can be in different cache lines, and you can
>> still have cache consistency overhead.
>
>You'll have to explain that a bit more; I don't understand the point
>you're making.

If there is a cache line containing code followed by a cache line
containing data, on (at least) some CPUs the code prefetcher will
prefetch the data line and incur cache consistency overhead.  See
<http://www.complang.tuwien.ac.at/misc/pentium-switch/> for data.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2012: http://www.euroforth.org/ef12/

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DTC Mark Wills <forthfreak@gmail.com> - 2012-11-27 08:01 -0800
  Re: DTC Paul Rubin <no.email@nospam.invalid> - 2012-11-27 08:55 -0800
    Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-27 09:01 -0800
  Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-11-27 17:42 -0800
    Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-27 23:50 -0800
      Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 04:41 -0600
        Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-28 02:48 -0800
          Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 05:27 -0600
            Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-28 03:51 -0800
              Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-11-28 21:56 -0800
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-29 01:26 -0800
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-11-29 22:34 -0800
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-30 01:42 -0800
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-11-30 13:18 -0800
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-01 01:42 -0800
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-12-03 15:25 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-03 16:18 -0800
                Re: DTC "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-12-03 21:20 -0500
                Re: DTC "Elizabeth D. Rather" <erather@forth.com> - 2012-12-03 17:29 -1000
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-04 00:12 -0800
                Re: DTC Paul Rubin <no.email@nospam.invalid> - 2012-12-05 11:35 -0800
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-12-04 20:17 -0800
                Re: DTC Ron Aaron <rambamist@gmail.com> - 2012-12-05 08:31 +0200
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-04 23:48 -0800
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-04 23:53 -0800
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-12-05 12:13 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-05 15:26 -0800
                Re: DTC Ron Aaron <rambamist@gmail.com> - 2012-12-06 06:32 +0200
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-06 01:07 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-06 04:23 -0800
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-06 15:49 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-06 07:42 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-06 08:30 -0800
                Re: DTC Paul Rubin <no.email@nospam.invalid> - 2012-12-06 09:45 -0800
                Re: DTC albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-12-06 21:41 +0000
                Re: DTC "A. K." <akk@nospam.org> - 2012-12-06 23:15 +0100
                Re: DTC albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-12-08 01:27 +0000
                Re: DTC "A. K." <akk@nospam.org> - 2012-12-08 11:19 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-08 03:55 -0800
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-08 13:44 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-08 06:05 -0800
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-08 18:35 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-08 11:20 -0800
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-09 01:01 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-08 06:10 -0800
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-08 18:57 +0100
                Re: DTC "A. K." <akk@nospam.org> - 2012-12-08 19:46 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-08 11:23 -0800
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-08 13:37 +0100
                Re: DTC "A. K." <akk@nospam.org> - 2012-12-08 14:41 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-08 06:15 -0800
                Re: DTC "A. K." <akk@nospam.org> - 2012-12-08 17:07 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-06 14:16 -0800
                Re: DTC Brad Eckert <hwfwguy@gmail.com> - 2012-12-07 09:00 -0800
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-06 14:21 -0800
                Re: DTC "Elizabeth D. Rather" <erather@forth.com> - 2012-12-06 08:01 -1000
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-06 14:18 -0800
                Re: DTC "Elizabeth D. Rather" <erather@forth.com> - 2012-12-06 13:48 -1000
                Re: DTC "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-12-06 19:03 -0500
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-07 02:59 -0800
                Re: DTC albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-12-06 13:13 +0000
                Re: DTC "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-12-05 20:39 -0500
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-06 15:46 +0100
                Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-12-06 07:47 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-06 08:36 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-12-05 04:03 -0800
                Re: DTC "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2012-12-06 20:30 -0800
                Re: DTC David Thompson <dave.thompson2@verizon.net> - 2012-12-11 23:52 -0500
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-12-12 10:59 -0800
                Re: DTC David Thompson <dave.thompson2@verizon.net> - 2012-12-31 02:43 -0500
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2013-01-02 00:44 -0800
            Re: DTC albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-11-28 13:54 +0000
              Re: DTC "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2012-12-06 20:16 -0800
    Re: DTC "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-11-28 06:58 -0500
      Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-28 04:50 -0800
        Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 07:08 -0600
          Re: DTC Mark Wills <forthfreak@gmail.com> - 2012-11-28 06:02 -0800
            Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 08:23 -0600
          Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-28 14:18 +0000
            Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 08:32 -0600
              Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-28 15:00 +0000
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 09:18 -0600
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-28 16:36 +0000
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 11:02 -0600
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-28 17:13 +0000
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 12:03 -0600
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-28 18:12 +0000
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-28 12:32 -0600
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-29 14:30 +0000
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-11-29 18:05 +0100
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-11-29 11:19 -0800
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-30 03:14 -0600
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-30 14:12 +0000
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-30 10:32 -0600
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-30 16:40 +0000
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-12-01 15:34 +0000
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-01 21:23 +0100
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-12-03 16:28 +0000
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-03 18:44 +0100
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-03 04:50 -0600
                Re: DTC Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-03 16:48 +0100
                Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-12-03 15:59 +0000
                Re: DTC albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-11-30 15:34 +0000
                Re: DTC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-30 10:36 -0600
                Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-11-30 12:47 -0800
                Re: DTC Alex McDonald <blog@rivadpm.com> - 2012-11-28 11:29 -0800
        Re: DTC "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-11-29 04:15 -0500
          Re: DTC "Elizabeth D. Rather" <erather@forth.com> - 2012-11-29 08:52 -1000
      Re: DTC Hugh Aguilar <hughaguilar96@yahoo.com> - 2012-11-28 22:25 -0800
        Re: DTC "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-11-29 04:12 -0500
  Re: DTC humptydumpty <ouatubi@gmail.com> - 2012-11-28 02:04 -0800
  Re: DTC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-11-28 14:21 +0000

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