Author: Armin Rigo <ar...@tunes.org> Branch: Changeset: r72235:c76af9b7eea9 Date: 2014-06-25 21:35 +0200 http://bitbucket.org/pypy/pypy/changeset/c76af9b7eea9/
Log: Document branch diff --git a/pypy/doc/whatsnew-head.rst b/pypy/doc/whatsnew-head.rst --- a/pypy/doc/whatsnew-head.rst +++ b/pypy/doc/whatsnew-head.rst @@ -30,3 +30,12 @@ x86-64, the JIT backend has a special optimization that lets it emit directly a single MOV from a %gs- or %fs-based address. It seems actually to give a good boost in performance. + +.. branch: fast-gil +A faster way to handle the GIL, particularly in JIT code. The GIL is +now a composite of two concepts: a global number (it's just set from +1 to 0 and back around CALL_RELEASE_GIL), and a real mutex. If there +are threads waiting to acquire the GIL, one of them is actively +checking the global number every 0.1 ms to 1 ms. Overall, JIT loops +full of external function calls now run a bit faster (if no thread was +started yet), or a *lot* faster (if threads were started already). _______________________________________________ pypy-commit mailing list pypy-commit@python.org https://mail.python.org/mailman/listinfo/pypy-commit
