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