[GRASS-dev] v.what.rast speedup
neteler at fbk.eu
Tue Oct 23 07:29:29 EDT 2007
Glynn Clements wrote:
> Markus Neteler wrote:
>> >> > You could try re-compiling the DBMI libraries with -DUSE_BUFFERED_IO
>> >> > to see if that helps at all.
> However, I don't think that it's going to tell me much in this case;
> the driver is almost certainly at lib/db/dbmi_driver/driver.c:140 (the
> db__recv_procnum() call), with the status code still sitting in the
> send buffer.
> Try the following patch:
> --- lib/db/dbmi_base/xdr.c 15 Oct 2007 05:24:17 -0000 1.6
> +++ lib/db/dbmi_base/xdr.c 22 Oct 2007 21:39:28 -0000
> @@ -88,6 +88,9 @@
> int db__recv(void *buf, size_t size)
> #if USE_STDIO
> +#ifdef USE_BUFFERED_IO
> + fflush(_send);
> return fread(buf, 1, size, _recv) == size;
> #elif USE_READN
> return readn(fileno(_recv), buf, size) == size;
This actually solves the problem. I have taken liberty to not debug
in details but directly tried (successfully) the patch.
Then we are back to 25 seconds, also with -DUSE_BUFFERED_IO
(and DBF). With SQLite 7 seconds, it seems that the flag has no
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