Author: Armin Rigo <ar...@tunes.org> Branch: extradoc Changeset: r5181:5b2495e71978 Date: 2014-04-04 15:23 +0200 http://bitbucket.org/pypy/extradoc/changeset/5b2495e71978/
Log: Fix for "don't conflict too much" diff --git a/planning/tmdonate2.txt b/planning/tmdonate2.txt --- a/planning/tmdonate2.txt +++ b/planning/tmdonate2.txt @@ -96,8 +96,6 @@ applications should perform better than in a regular PyPy. (All numbers presented here are comparing different versions of PyPy which all have the JIT enabled.) -XXX I wonder whether we need to add a caveat like "for applications that don't -conflict too much" somewhere You will find below a sketch of the `work plan`_. If more money than requested is collected, then the excess will be entered into the general @@ -300,6 +298,10 @@ * Forking the process is slow. +* We don't foresee particularly high conflict rates in regular + multithreaded programs, but this assertion needs to be checked + and possibly some heuristics improved. + Fixing all these issues is required before we can confidently say that PyPy-TM is an out-of-the-box replacement of a regular PyPy which gives speed-ups over the regular PyPy independently of the Python program it @@ -326,7 +328,12 @@ likely to be found, and communicates it to the system, using some lightweight library on top of ``with atomic``. -This introduces new issues. At the very least, we need a way to get +However, this introduces new issues. The main one is that by forcing +transactions to be longer, "conflicts" will become more common, up to +the point of partially or completely offsetting the benefit of using +PyPy-TM in the first place. + +So the programmer using PyPy-TM needs a way to get feedback about what conflicts we get in these long-running transactions, and where they are produced. A first step will be to implement getting "tracebacks" that point to the places where the most time is lost. This _______________________________________________ pypy-commit mailing list pypy-commit@python.org https://mail.python.org/mailman/listinfo/pypy-commit
