by Qihoo360

Qihoo360 / kmemcache

linux kernel memcache server

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kmemcache is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

kmemcache is derived from memcached-v1.4.15, exactly it is a linux kernel memcached, and aims at quicker response and higher performance.

Current Limitations

kmemcache has now implemented all most major features of memcached, including the complete binary and text protocols, based on tcp, udp and unix domain communication protocols, slab allocation dynamically rebalanced, hash table expansion and so on.

The programming interface remains consistent with memcached. Clients using memcached can easily connected to kmemcache, without modification. You could also easily add the kmemcache server to your cluster of memcached servers.

The following are some features that have not been implemented yet:


kernel: [2.6.32, 3.2]
other versions have not been tested

Building, Running & Testing

1) Clone kmemcache from github

[[email protected]]$ git clone

2) Compiling kmemcache

[[email protected]]$ cd kmemcache
[[email protected]]$ make

3) Running kmemcache

3.1 Change user to root

[[email protected]]$ su root

3.2 Insert kernel module and start server

[[email protected]]# insmod kmod/kmemcache.ko
[[email protected]]# user/umemcached -h
[[email protected]]# user/umemcached -p 11213

4) Stopping kmemcache

[[email protected]]# rmmod kmemcache

5) Testing kmemcache

5.1 Case 1, using libmemcached

[[email protected]]# apt-get install libmemcached
[[email protected]]# memcapable -h localhost -p 11213
[[email protected]]# memslap --servers=localhost:11213

5.2 Case 2, using testapp

[[email protected]]# insmod kmod/kmctest.ko
[[email protected]]# ./test/testapp

5.3 Case 3, using perl scripts

[[email protected]]# ./t/

5.4 More cases refer to memcached


Want to contribute? You are so welcome! Any reporting bugs, feedback, and pulling requests are encouraged!


Official memcached:
Test tools:
Something about kmemcache from my blog:

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