Re: Constructing sequences
On 27 Jun 2005, at 7:43, Gordon Webster wrote:
>
>
> posted by: Gordon Webster <gwalias-bb at yahoo.com>
>
> Dear Euphorians
>
> Overall, I'm very happy with the performance of Euphoria (both
> interpreted and compiled from translated C), but I've noticed
> that constructing sequences seems to be pretty slow by comparison
> with accessing them once they are constructed.
>
> When I add 100,000 smaller sequences (my data "records") to a storage
> sequence, it takes me nearly 40 seconds either interpreted or
> compiled, to complete. Once this 100,000 record sequence is built
> however, I can access the various "records" and/or their "fields"
> at blazing speeds. I get no speed up on the compiled version for
> the construction of the sequence, but I do get some speedup for the
> already very rapid access to the built sequence.
>
> I have even tried making the sequence to be constructed global, and
> using a procedure to append to it, rather than a function which has
> to pass a copy of the sequence. It made no discernible difference.
>
> I have read the performance tips about using the optimized form
> 'append' etc. etc., but if any of you out there have any experience
> of improving the speed of creation of large sequences, I'd be very
> grateful for any tips or pointers (no pun intended).
See the last email thread about getf(). It's now extremely fast at building a
sequence in memory from a harddrive file. HTH.
Kat
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