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Memcache and Slab Size

Posted on 2009-04-20
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Hi,
I'm trying to better understand how memcache's slabs work. Currently I'm storing thousands of very small items in memcache, and many are expiring way too soon. When I look at the stats, it shows memcache still has plenty of available memory.

So I'm wondering.. When memcache receives an item, and decides it should go into slab 7, does it evict items in slab 7 if that slab is full , even though memcache itself still has plenty of available memory? Or does it create a new slab, and store the item in there, leaving the existing items in slab 7 untouched?
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Question by:headzoo
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by:ComputerTechie
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I object I answer the quesion and did not get a response.

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if the user used memcache command with -L or -f it would let the user the result the user is looking for.

You can tune the growth factor to reduce this effect by using the -f command line option. This will adapt the growth factor applied to make more effective use of the chunks and slabs allocated. For information on how to determine the current slab allocation statistics, see Section 14.5.4.2, memcached Slabs Statistics.
If your operating system supports it, you can also start memcached with the -L command line option. With this option enabled, it will preallocate all the memory during startup using large memory pages. This can improve performance by reducing the number of misses in the CPU memory cache.
 
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