Siva Kumar wrote:
Thank you for the tip Emmanuel.
You're welcomed, Siva
But its not seem to help me.
May be because the cache size you selected is far from being large enough.
Let me explain.
Suppose that disk access are 100 times slower than memory access. If it
cost T to reach data from disk, with 40 000 elements, if you cache 100
of them, then you will have a ratio of 100/40000 access done in T/100
and 39900/40000 access done in T.
Average access time = (39900/40000*T + 100/4000000*(T/100)) = 99,7525% T
(~ T, in other terms).
Now, you have a 5000 cache size. What does it means in term of
performance increase ?
5000/40000 access done in T/100
35000/40000 access done in T
Average : (5000/40000*T/100 + 35000/40000*T) = 87,625% T. In other
terms, roughly a 10% speedup. Almost unnoticeable...
Do what I said : set the cache size to 40000, increase your JVM memory .
PS : You can also increase the cachesize for entries ( the cachesize
parameter associated with your partition, not those associated with index).
Hope it helps...
--
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cordialement, regards,
Emmanuel Lécharny
www.iktek.com
directory.apache.org
