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Path: ...!weretis.net!feeder9.news.weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: anton@mips.complang.tuwien.ac.at (Anton Ertl) Newsgroups: comp.lang.forth Subject: Re: Parallel Forth on a 44 core machine Date: Sun, 18 Aug 2024 15:14:52 GMT Organization: Institut fuer Computersprachen, Technische Universitaet Wien Lines: 18 Message-ID: <2024Aug18.171452@mips.complang.tuwien.ac.at> References: <a46cb8e455c12e2c81cd2ff60c095528@www.novabbs.com> <112ba13cc3d99496d5825773b3f0642e@www.novabbs.com> <2df471d1ec39c22949169f8a612b780d@www.novabbs.com> <nnd$0f8813aa$41d0ee61@18dd570284c2b77b> <932f13f537e8c918ecd2089466e4c405@www.novabbs.com> <2024Aug18.154233@mips.complang.tuwien.ac.at> <f149ab8c61a2bc72b3471b90985a3930@www.novabbs.com> Injection-Date: Sun, 18 Aug 2024 17:25:58 +0200 (CEST) Injection-Info: dont-email.me; posting-host="11f9cdd7e7dbbdab9d286c1d611a2b79"; logging-data="2563364"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18EImlzvHm0uPbvO9Wkp7kW" Cancel-Lock: sha1:CAC2YViYifxfUcHxrRMzrgxGXx4= X-newsreader: xrn 10.11 Bytes: 1910 mhx@iae.nl (mhx) writes: >Do you know if shared memory as provided by the OS (or Windows) >has these problems too? Shared memory has false sharing problems, however that sharing is arranged. The slowdown comes from the hardware. See <https://en.wikipedia.org/wiki/False_sharing>. The I-cache/D-cache ping-pong when you have writable data close to executed code on AMD64 is also false sharing, this time within one core. - 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: https://forth-standard.org/ EuroForth 2024: https://euro.theforth.net