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Dave Watson b8823ab026 Use linear scan for small bitmaps 
For small bitmaps, a linear scan of the bitmap is slightly faster than
a tree search - bitmap_t is more compact, and there are fewer writes
since we don't have to propogate state transitions up the tree.
On x86_64 with the current settings, I'm seeing ~.5%-1% CPU improvement
in production canaries with this change.

The old tree code is left since 32bit sizes are much larger (and ffsl
smaller), and maybe the run sizes will change in the future.

This resolves #339.
2016-02-26 14:21:10 -08:00
bin Pass retain and exclude parameters to /pprof/symbol. 2016-01-29 19:59:06 -08:00
build-aux Use AC_CONFIG_AUX_DIR([build-aux]). 2015-11-12 11:23:39 -08:00
doc Make *allocx() size class overflow behavior defined. 2016-02-25 15:29:49 -08:00
include Use linear scan for small bitmaps 2016-02-26 14:21:10 -08:00
msvc Improve test_threads performance 2016-02-26 17:18:58 +01:00
src Use linear scan for small bitmaps 2016-02-26 14:21:10 -08:00
test Miscellaneous bitmap refactoring. 2016-02-26 14:21:10 -08:00
.autom4te.cfg Disable autom4te cache. 2014-09-02 17:49:29 -07:00
.gitattributes fix git handling of newlines on windows 2014-05-07 18:48:39 -04:00
.gitignore Add MS Visual Studio 2015 support 2016-02-20 10:55:23 -08:00
autogen.sh Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
ChangeLog Update ChangeLog for 4.0.4. 2015-10-24 07:53:25 -07:00
config.stamp.in Move repo contents in jemalloc/ to top level. 2011-03-31 20:36:17 -07:00
configure.ac Compile with -Wshorten-64-to-32. 2016-02-24 13:03:48 -08:00
COPYING Update copyright dates for 2015. 2015-01-22 16:03:00 -08:00
coverage.sh Add test code coverage analysis. 2013-12-06 18:50:51 -08:00
INSTALL Add --with-malloc-conf. 2016-02-19 20:29:06 -08:00
jemalloc.pc.in Take into account the install suffix that jemalloc was built with in the pkg-config file. 2015-02-13 12:46:19 -08:00
Makefile.in Test run quantization. 2016-02-22 14:58:05 -08:00
README Update README. 2013-10-20 19:38:19 -07:00

README 

jemalloc is a general purpose malloc(3) implementation that emphasizes
fragmentation avoidance and scalable concurrency support.  jemalloc first came
into use as the FreeBSD libc allocator in 2005, and since then it has found its
way into numerous applications that rely on its predictable behavior.  In 2010
jemalloc development efforts broadened to include developer support features
such as heap profiling, Valgrind integration, and extensive monitoring/tuning
hooks.  Modern jemalloc releases continue to be integrated back into FreeBSD,
and therefore versatility remains critical.  Ongoing development efforts trend
toward making jemalloc among the best allocators for a broad range of demanding
applications, and eliminating/mitigating weaknesses that have practical
repercussions for real world applications.

The COPYING file contains copyright and licensing information.

The INSTALL file contains information on how to configure, build, and install
jemalloc.

The ChangeLog file contains a brief summary of changes for each release.

URL: http://www.canonware.com/jemalloc/