[Jdbm-general] Re: JDBM performance

[Alex B. <boi...@in...>]

Eric,

(I'm also CC:'ing the JDBM mailing list)

You question about JDBM's performance picked my curiosity.  So, just for
fun, I generated a B+Tree containing 10 million simple objects
(java.lang.Long for both key and value).

After that, I queried the database for 1000 random numbers.  It turns
out the average lookup time for a random object in the B+Tree was approx
30-40 milliseconds with a cold cache.

You mileage may vary, depending on the size of your objects, the
complexity of serialization and the cost of comparing objects for
ordering.  In any case, it should give you an order of magnitude for
JDBM's performance.

I ran the test on my Dell laptop (P3/700Mhz/256RAM) on Win2K with Sun's
JDK 1.3.  If you're interested, I can send you the source for the test
(or even add it to the JDBM distribution).

cheers,
alex

-- 
Alex Boisvert                                     boi...@in...
Project Manager,  Intalio Inc.                         www.intalio.com
Operate at the Process Level <SM>                       (650) 345 2777