From: Roger Pack <rogerdpack2@...>
Date: 2012-10-12T09:38:00+09:00
Subject: Re: [ANN] google_hash v 0.7.0 released. Faster hashes for MRI.

>> RObject is 40 bytes on 64-bit MRI.  On the plus side with 64-bit,
>> embedded strings can be up to 23 bytes (vs 11 bytes for 32-bit) so
>> there's a better chance of avoiding malloc() overhead with strings.
>
> But we're talking ints here... so they just take up the space of VALUE. I don't know why that's being compared against RObject.

I presumed they were encapsulated within an RObject, so would take up
as much space, though I suppose they might not be.

Anyway it does decrease the time to do a GC from 0.1s to 0.002 with a
hash of 2M integers, so that's worth something :)

GoogleHashDenseIntToInt
"dense"
"took"
"0.002"

"ruby hash"
"took" "3.381"
"0.103"

But by all means, if it doesn't improve your throughput, don't use it :)
-roger-