Author: Remi Meier <remi.me...@gmail.com> Branch: extradoc Changeset: r5047:be80581fecf8 Date: 2013-09-12 16:50 +0200 http://bitbucket.org/pypy/extradoc/changeset/be80581fecf8/
Log: draft for stm update diff --git a/blog/draft/stm-sept2013.rst b/blog/draft/stm-sept2013.rst new file mode 100644 --- /dev/null +++ b/blog/draft/stm-sept2013.rst @@ -0,0 +1,52 @@ +Update on STM +============= + +Hi all, + +the sprint in London was a lot of fun and very fruitful. In the last +update on STM, Armin was working on improving and specializing the +automatic barrier placement. +There is still a lot to do in that area, but that work was merged and +lowered the overhead of STM over non-STM to around **XXX**. The same +improvement has still to be done in the JIT. + +But that is not all. Right after the sprint, we were able to squeeze +the last obvious bugs in the STM-JIT combination. However, the performance +was nowhere near what we want. So until now, we fixed some of the most +obvious issues. Many come from RPython erring on the side of caution +and e.g. making a transaction inevitable even if that is not strictly +necessary, thereby limiting parallelism. +**XXX any interesting details?** +There are still many performance issues of various complexity left +to tackle. So stay tuned or contribute :) + +Now, since the JIT is all about performance, we want to at least +show you some numbers that are indicative of things to come. +Our set of STM benchmarks is very small unfortunately +(something you can help us out with), so this is +not representative of real-world performance. + +**Raytracer** from `stm-benchmarks <https://bitbucket.org/Raemi/stm-benchmarks/src>`_: +Render times for a 1024x1024 image using 6 threads + ++-------------+----------------------+ +| Interpeter | Time (no-JIT / JIT) | ++=============+======================+ +| PyPy-2.1 | ... / ... | ++-------------+----------------------+ +| CPython | ... / - | ++-------------+----------------------+ +| PyPy-STM | ... / ... | ++-------------+----------------------+ + +**XXX same for Richards** + + +All this can be found in the `PyPy repository on the stmgc-c4 +branch <https://bitbucket.org/pypy/pypy/commits/branch/stmgc-c4>`_. +Try it for yourself, but keep in mind that this is still experimental +with a lot of things yet to come. + +You can also download a prebuilt binary frome here: **XXX** + + _______________________________________________ pypy-commit mailing list pypy-commit@python.org https://mail.python.org/mailman/listinfo/pypy-commit
