Any ideas on faster TLS ?

From	Ron Aaron <rambamist@gmail.com>
Newsgroups	comp.lang.forth
Subject	Any ideas on faster TLS ?
Date	2017-02-27 07:30 +0200
Organization	A noiseless patient Spider
Message-ID	<o90deq$vvp$1@dont-email.me> (permalink)

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One of the bottlenecks in 8th performance is the fact that the primary
stacks as well as a lot of other information are per-thread.  Thus, the
internal "context" data structure is TLS-based.

This works very well: different threads have different stacks and states
without conflicting.  But since the 'context' is so primary a structure,
it gets accessed a lot, and the TLS access (in clang or gcc) is quite slow.

In a very old version of 8th compiled with gcc, I used the gcc-specific
method of making the 'context' a global, fixed-register variable.  That
was much, much faster.  Unfortunately, clang cannot do that as far as I
can tell.

I'm using clang instead of gcc, since gcc has a persistent bug (relating
to improper alignment of data items; it's an old bug which will probably
never get fixed), so the 'fixed-register' idea is out.

Does anyone know of a better way to have per-thread data structures
rather than just using the "__thread" keyword and relying on the
compiler's TLS support?

Thanks!

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Any ideas on faster TLS ? Ron Aaron <rambamist@gmail.com> - 2017-02-27 07:30 +0200
  Re: Any ideas on faster TLS ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-02-27 04:01 -0600
    Re: Any ideas on faster TLS ? Ron Aaron <rambamist@gmail.com> - 2017-02-27 13:19 +0200
      Re: Any ideas on faster TLS ? Alex <alex@rivadpm.com> - 2017-02-27 12:56 +0000
        Re: Any ideas on faster TLS ? Ron Aaron <rambamist@gmail.com> - 2017-02-27 15:10 +0200
        Re: Any ideas on faster TLS ? albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-02-27 17:08 +0100
      Re: Any ideas on faster TLS ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-02-27 08:06 -0600
        Re: Any ideas on faster TLS ? Ron Aaron <rambamist@gmail.com> - 2017-02-27 16:10 +0200
          Re: Any ideas on faster TLS ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-02-27 09:31 -0600
            Re: Any ideas on faster TLS ? Ron Aaron <rambamist@gmail.com> - 2017-02-28 07:05 +0200
            Re: Any ideas on faster TLS ? Paul Rubin <no.email@nospam.invalid> - 2017-02-27 23:15 -0800
              Re: Any ideas on faster TLS ? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-02-28 04:02 -0600
                Re: Any ideas on faster TLS ? Bernd Paysan <bernd@net2o.de> - 2017-03-11 19:58 +0000
      Re: Any ideas on faster TLS ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-03-01 12:36 +0000
        Re: Any ideas on faster TLS ? Ron Aaron <rambamist@gmail.com> - 2017-03-01 15:11 +0200
          Re: Any ideas on faster TLS ? Alex <alex@rivadpm.com> - 2017-03-03 01:18 +0000
            Re: Any ideas on faster TLS ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-03-03 12:55 +0000
              Re: Any ideas on faster TLS ? Alex <alex@rivadpm.com> - 2017-03-03 14:59 +0000
                Re: Any ideas on faster TLS ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2017-03-03 16:15 +0000
          Optimizing (was: Any ideas on faster TLS ?) Ron Aaron <rambamist@gmail.com> - 2017-03-17 13:14 +0200
  Re: Any ideas on faster TLS ? rickman <gnuarm@gmail.com> - 2017-02-28 01:13 -0500
    Re: Any ideas on faster TLS ? Paul Rubin <no.email@nospam.invalid> - 2017-02-27 22:48 -0800
      Re: Any ideas on faster TLS ? rickman <gnuarm@gmail.com> - 2017-02-28 03:50 -0500

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