Re buffering - I used FCREATE() to create the file, not FOPEN(). I don't know if FCREATE() uses buffering by default.
Laurie On 28 March 2015 at 21:58, Dan Covill <dan.cov...@outlook.com> wrote: > If you re-read the report, they were not "creating a 1MB string in > memory", they were concatenating thousands of sub-strings until they had 1 > MB. It's the concatenation implementation that took all the time, because > each instance allocated new memory space, did the concat, then released the > old memory. > > I ran into this some years ago, when a colleague had a VFP program that > was running very slowly. The problem was the same; he was generating a > small piece of output text, concatenating it to what he already had, then > generating the next piece, etc. The solution was to generate all the > pieces in an array, then do one big concat. > > I suspect it was the malloc that was the culprit, not the concat. > > Dan > > ---------------------------------------- > > Date: Sat, 28 Mar 2015 09:46:57 +0000 > > Subject: Re: [NF] its-not-always-quicker-to-do-things-in-memory > > From: trukke...@gmail.com > > To: profoxt...@leafe.com > > > > Interesting. It's certainly faster on my box (VFP9 SP2 on XP SP3) to > create > > a 1 Mb string in memory and do one write than to do 1,000,000 calls to > > STRTOFILE(<string>, <file>,1). In memory took about 690 ms, the other > > method took over 10 secs to do 7000 writes. > > [excessive quoting removed by server] _______________________________________________ Post Messages to: ProFox@leafe.com Subscription Maintenance: http://mail.leafe.com/mailman/listinfo/profox OT-free version of this list: http://mail.leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/camvtr9fnbvu8s+tylxgi5btthbssbj07bll3rv3a2zsdxye...@mail.gmail.com ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
