Re: [Pytables-users] pytables/numarray performance

[Francesc A. <fa...@ca...>]

El dv 02 de 09 del 2005 a les 21:38 +0200, en/na Francesco Del Degan va
escriure:
> For a table, composed by 2 columns, an integer and a float, i've reached
> 367KRows/s... very good!

Yeah, this is more or less the kind of performance that you can expect
from PyTables.

> But performance on chararrays is very poor, in comparison to numeric ones=
.
>=20
> Adding a CharArray of 10^6 elements  of 1 byte drop the performance to
> 100Krows/s, and add two CharArray of  byte,
> drop to 30Krows/s. It also seems independent by maximum string length.

Yes, in experience, including strings in tables drops the append
performance significantly. I don't know were is exactly the problem, but
if you are willing to profile this case in order to see where the hot
spots are, that would be really interesting.

Cheers,

--=20
>0,0<   Francesc Altet     http://www.carabos.com/
V   V   C=E1rabos Coop. V.   Enjoy Data
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