Memcached Memcached 1.4.25 released

eva2000 · Nov 24, 2015

Memcached 1.4.25 has been released ReleaseNotes1425 · memcached/memcached Wiki · GitHub
Overview
Many small fixes from internal and public pull requests/bug reports have gone into this release. Thanks to all of those who contribute.

A large change to slab class rebalancing has gone into this release. Please read carefully below and try the new options, as they may improve your memory efficiency and hit ratio. Especially for long running instances.

Fixes

Automake improvements

Misc documentation fixes

Misc updates to startup scripts

lru_crawler enable blocks until ready (test failure)

Record and report on time spent in listen_disabled (time_in_listen_disabled_us)

Update manpage for -I command. Make it more clear

Fix display of settings.hot_lru_pct in stats settings

No longer edits the output of ps while processing arguments

No longer crashes when failing to give arguments to some start args

Fix memcached unable to bind to an ipv6 address

No longer attempts bind to same interface more than once

fixed libevent version check: add the missing 1.0.x version check

fix off-by-one in LRU crawler, causing rare segfault

remove another invalid assert(), fixes clang and pedantic compilation

New Features
Slab automover has gotten a very large update. The wider discussion can be found in the pull request.

As data is stored into memcached, it pre-allocates pages of memory into slab classes of a particular size (ie: 90 bytes, 120 bytes). If you fill your cache with 90 byte objects, and then start writing 120 byte objects, there will be much less space available for 120 byte objects.

With the slab automover improvements, freed memory can be reclaimed back into a global pool and reassigned to new slab classes. You can also still manually move slab pages between classes with your own external process if the automover does not fit your needs (see doc/protocol.txt for full details).

The automover now attempts to rescue items which are still valid when moving a page from one class to another, or from one class into the global page pool. This makes it much less destructive.

To get all of the benefits of the last few releases, we recommend adding the following startup options:
Code:
-o slab_reassign,slab_automove,lru_crawler,lru_maintainer
A modern start line includes a few other items:
Code:
-o slab_reassign,slab_automove,lru_crawler,lru_maintainer,maxconns_fast,hash_algorithm=murmur3
Many of these options are likely to become defaults in the future.
Click to expand...

rdan · Nov 24, 2015

Just updated my WP sites on PHP 7 that is Memcached Dependent .

eva2000 · Nov 24, 2015

RoldanLT said: ↑

Just updated my WP sites on PHP 7 that is Memcached Dependent .
Click to expand...

Thanks for the confirmation.. working on my end too

rdan · Nov 24, 2015

eva2000 said: ↑

Thanks for the confirmation.. working on my end too
Click to expand...

Same PHP 7 and CentOS 7?

eva2000 · Nov 24, 2015

RoldanLT said: ↑

Same PHP 7 and CentOS 7?
Click to expand...

Nope on CentOS 6.7 and PHP 5.6.15 VPSes

rdan · Nov 24, 2015

Ah, so no error on memcached update menu #10.

eva2000 · Nov 24, 2015

RoldanLT said: ↑

Ah, so no error on memcached update menu #10.
Click to expand...

i don't get on PHP 7.0.0RC7 either on CentOS 6.7 or 7.0

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Memcached Memcached 1.4.25 released

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