ReleaseNotes1436
Date: 2017-3-19
http://www.memcached.org/files/memcached-1.4.36.tar.gz
Important bug fix that could lead to a hung slab mover. Also improves memory efficiency of chunked items.
- fix refcount leak in LRU bump buf
Chained items were introduced in 1.4.29. With -o modern items sized 512k or
higher are created by chaining 512k chunks together. This made increasing the
max item size (-I) more efficient in many scenarios as the slab classes no
longer have to be stretched to cover the full space.
There was still an efficiency hole for items 512k->5mb or so where the overhead is too big for the size of the items. This change fixes it by using chunks from other slab classes in order to "cap" off chained items. With this change larger items should be more efficient than the original slab allocator in all cases.
Chunked items are only used with -o modern or explicitly changing -o slab_chunk_max
It is not recommended to set slab_chunk_max to be smaller than 256k at this
time.
The following people contributed to this release since 1.4.35.
Note that this is based on who contributed changes, not how they were done. In many cases, a code snippet on the mailing list or a bug report ended up as a commit with your name on it.
Note that this is just a summary of how many changes each person made
which doesn't necessarily reflect how significant each change was.
For details on what led up into a branch, either grab the git repo and
look at the output of git log 1.4.35..1.4.36 or use a web view.
- Repo list: https://github.com/memcached/memcached/wiki/DevelopmentRepos
- Web View: http://github.com/memcached/memcached/commits/1.4.36
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