Re: [Gretl-users] Speed of "join"
On Sun, 22 Sep 2013, Riccardo (Jack) Lucchetti wrote:
On Sun, 22 Sep 2013, Artur T. wrote:
>> This is _very_ strange. Are you sure you're using the current CVS
>> version (or a corresponding snapshot)?
>>
>> -------------------------------------------------------
>> Riccardo (Jack) Lucchetti
>
> Yes, the build date is 2013-09-22. I am also puzzled. Could it be an CPU
> issue? I am using an AMD CPU -- maybe some of the important processor
> operations just work much slower on this machine.
Now, this is even more strange. Are you using a snapshot or compiling
from source? I'm asking because I'm beginning to think that something
could have gone wrong when updating your source code and you are indeed
using a 22-09 build, but from an older codebase.
Artur, I have the same doubt. I just tried Jack's test script with
mean_n_hh = 10000 and here's what I get:
gretl 1.9.12 release:
individuals = 750212 (30 countries, 300007 households); time = 177.326
seconds
current CVS:
individuals = 750212 (30 countries, 300007 households); time = 0.68443
seconds
(speed-up factor: 259)
Now the CPU here is Core i7, but the recent speed-up for join is very
generic, it doesn't depend on vectorization or multi-threading. So I'd
expect a roughly comparable speed improvement (in ratio terms) on any CPU
capable of running gretl.
Allin