OpenEuphoria

RE: Out of memory

• Posted by Derek Parnell <Derek.Parnell at SYD.RABOBANK.COM> Jun 06, 2002
• 414 views

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> -----Original Message-----
> From: Jacques Guy [mailto:jguy at alphalink.com.au]
> Sent: Friday, 7 June 2002 10:00
> To: EUforum
> Subject: RE: Out of memory
> 
> 
> 
> I had a similar problem recently, not memory (my data file
> was much smaller) but speed of loading. Using get() the
> file took 26 seconds to load. I thought this grossly
> wrong. So I rewrote those parts of my program, without
> get(), using "for" and "while" loops writing to disk
> and reading from disk and _never_ using recursion. It
> worked: the same file loaded in 0.33 seconds. No, not
> a typing mistake: from 26 seconds to one third of a
> second.
> 
> I was not surprised. I had had a similar experience
> several years earlier, memory that time. I was having
> a team of programmers implement a database of icons
> (they used C++). It all went along well when, one day,
> they sent me a new implementation, which barfed after
> loading just 37 icons -- and I had 64M of RAM, just
> about the maximum you could ever hope for in those
> days.  So they got a very puzzled "please explain".
> After apparently much head scratching the team leader
> explained "we have been using  heavily recursive
> structures and procedures". That was it, of course.
> They rewrote it using iteration instead of recursion
> and I ran out of icons before I ran out of memory
> again.
> 
> I haven't had a look at the source code, but I
> guess that get() is -- almost necessarily --
> implemented recursively.  It's fine for loading
> flat or shallow data, but, as experience shows,
> dreadfully inefficient for deeply embedded 
> sequences, as you obviously have.
> 

I have to agree with Jacques here. I've found that it is best to only use
getc(), gets() and occassionally get_bytes() to read disk files. And I would
never recommend get() or print() based on their speed (or lack thereof).
---------
Derek.

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