Yes this is my gut feeling too.
If the authors knew about the limited range of #identityHash, that is
entirely possible. I tend to think it more likely that in most cases
these implementations are just the simplest way to follow the dictate
that 'a=b - a hash = b hash', and that they didn't
What I can tell you is that I ***loves*** this discussion.
It illustrates the spirit of pharo that we want to push.
Let's make a better and cooler smalltalk :)
And people are even learning nice knowledge.
Thanks
On Oct 29, 2009, at 3:14 AM, Andres Valloud wrote:
Martin,
One of the
We agree, mod I wouldn't want to impose version maintenance homework
on
maintainers of large packages. For the sake of illustration only, and
using Magma without knowing if it would be affected, I wouldn't want
whoever is maintaining Magma to maintain two branches... one for Pharo
1.xyz,
Martin
so what you are saying is that we can gain speed. And that these
changes are beneficial for simple default.
The test code, a variant of the test from the HashTable SqueakSource
wiki, is at the bottom of this message. Basically, it adds a bunch
of instances of Object to a
Stephane et al,
Martin and I discussed this yesterday night at the PDX Smalltalk user
group meeting. Mostly we agree, with perhaps one small exception. In
order to make hashed collections simpler and identity hash handling more
straightforward, hashed collections should get a small integer
Andres Valloud wrote:
Stephane et al,
Martin and I discussed this yesterday night at the PDX Smalltalk user
group meeting. Mostly we agree, with perhaps one small exception. In
order to make hashed collections simpler and identity hash handling more
straightforward, hashed collections
I looked at the squeak identityHash in squeak a few years back
(a) how efficient was the algorithm? Attempted at one time to replace with a
fixed array of numbers. There was some benefit on slow machines.
(b) only calculate the identity hash when required, but then how do you mark
the oops with
Martin McClure wrote:
Gotta go see my wife in a play now; will comment on these graphs later.
The play was fun :-)
Now about the graphs:
The test code, a variant of the test from the HashTable SqueakSource
wiki, is at the bottom of this message. Basically, it adds a bunch of
instances of
Gotta go see my wife in a play now; will comment on these graphs later.
-Martin
inline: DictPerformanceGraphs.png___
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