Hi Jonathan, I see this page (http://wiki.apache.org/cassandra/SSTableMemtable) does not exist yet.
thanks. Dir. On Tue, Apr 20, 2010 at 3:41 AM, Jonathan Ellis <jbel...@gmail.com> wrote: > (Moving to users@ list.) > > Like any Java server, Cassandra will use as much memory in its heap as > you allow it to. You can request a GC from jconsole to see what its > approximate "real" working set it. > > http://wiki.apache.org/cassandra/SSTableMemtable explains why reads > are slower than writes. You can tune this by using the key cache, row > cache, or by using range queries instead of requesting rows one at a > time. > > contrib/py_stress is a better starting place for a benchmark than > rolling your own, btw. we see about 8000 reads/s with that on a > 4-core server. > > On Sun, Apr 18, 2010 at 8:40 PM, Bingbing Liu <rucb...@gmail.com> wrote: > > Hi,all > > > > I have a cluster of 5 nodes, each node has a 4 cores cpu and 8 G Memory. > > > > I use the 0.6-beta3 cassandra for testting. > > > > First , i insert 6,000,000 rows each of which is 1k bytes, the speed of > write is so excited. > > > > But then ,when i read them each row at a time from two clients at the > same time ,one of the client is very slow and use so long a time, > > > > i find that on each node the process of Cassandra occupy 7 G memory or so > (use the "top" command), that puzzled me. > > > > Why read operation use so much of memory? May be i missed something? > > > > Thx. > > > > > > 2010-04-18 > > > > > > > > Bingbing Liu > > >
