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Issue 18774: Update news and whatsnew for the set optimizations

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Raymond Hettinger 2013-08-19 09:12:20 -07:00
parent 85532eb212
commit c301b55d7b
2 changed files with 10 additions and 0 deletions
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Doc/whatsnew/3.4.rst
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@ -389,6 +389,12 @@ Major performance enhancements have been added:
* The UTF-32 decoder is now 3x to 4x faster. * The UTF-32 decoder is now 3x to 4x faster.
* The cost of hash collisions for sets is now reduced. Each hash table
probe now checks a second key/hash pair for each cache line retrieved.
This exploits cache locality to make collision resolution less expensive.
(Contributed by Raymond Hetting in :issue"`18771`.)
Build and C API Changes Build and C API Changes
======================= =======================

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Misc/NEWS
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@ -12,6 +12,10 @@ Core and Builtins
- Issue #18774: Remove last bits of GNU PTH thread code and thread_pth.h. - Issue #18774: Remove last bits of GNU PTH thread code and thread_pth.h.
- Issue #18771: Add optimization to set object lookups to reduce the cost
of hash collisions. The core idea is to inspect a second key/hash pair
for each cache line retrieved.
- Issue #16105: When a signal handler fails to write to the file descriptor - Issue #16105: When a signal handler fails to write to the file descriptor
registered with ``signal.set_wakeup_fd()``, report an exception instead registered with ``signal.set_wakeup_fd()``, report an exception instead
of ignoring the error. of ignoring the error.