incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Peter Schuller <>
Subject Re: Predictable low RW latency, SLABS and STW GC
Date Tue, 26 Jul 2011 20:25:33 GMT
> Restarting the service will drop all the memmapped caches, cassandra caches are saved
/ persistent and you can also use memcachd if you want.

Well, the OS won't evict everything from page cache just because the
last process to map them exits. That said, since restarts tend to have
secondary effects on caches like streaming through all the bf and
index files, restarts are certainly detrimental to the page cache.
Also you may still see some eviction (even if it doesn't *necessarily*
happen) depending (particularly if not running with numactl set to

/ Peter Schuller (@scode on twitter)

View raw message