>>>>> "Andrew" == Andrew Haley <aph@xxxxxxxxxx> writes: Andrew> There are things that we can try, such a using a better way to turn an Andrew> address into a hash. At some point we changed libgcj's hash function to this: // This was chosen to yield relatively well distributed results on // both 32- and 64-bit architectures. Note 0x7fffffff is prime. return (jint) ((unsigned long) obj % 0x7fffffff); It used to simply return the address. I think we were having trouble because it was losing all the upper bits on 64 bit platforms. As far as I know we haven't looked into how effective, or not, this is (on different workloads, etc... I don't remember hearing about Hashtable showing up in a profile before). Twisti, if you try it out, let us know :-) Tom
