1. Re: Rob: Out of memory + broken shorthand assignment operators in expressio
Vincent wrote:
>
> Robert Craig wrote:
> >
> > Vincent wrote:
> > > This is quite interesting because I've written small programs
> > > simular to that, and Euphoria runs out of memory (every time)
> > > at loop 141441051. I didnt think of reporting it, because I
> > > thought my computer was running out of memory. Adjusting the
> > > swap file size did nothing.
> > >
> > > My computer is a 2.66 GHz Pentium 4 Northwood 512 KB L2 cache;
> > > 512 MB DDR SD-RAM @ 333 MHz; 512 MHz front-side bus; Windows XP
> > > SP 2.
> >
> > Hmm... 141441051 x 4 bytes per element = 565,764,204 bytes
> > which already exceeds your RAM. Plus where is the O/S
> > supposed to reside? Plus append() must sometimes make a full
> > copy of your sequence plus extra, when it moves the data
> > to a new larger contiguous block.
> >
>
> But it crashes with the same value regardless if the swap file is
> 2 GB or 4 GB. Doesn't Euphoria utilize the swap file when it uses
> all the system memory? It could'nt have used all 4 GB of RAM+swap
> file? The way your talking... if append() copied the sequence,
> then maybe just a little more than 1 GB would be required.
>
> > > I discovered an issue that has to do with assignment operators
> > > failing to work in conditional or loop expressions. My guess
> > > is that this been a issue since they were introduced in
> > > Euphoria v2.1.
> > >
> > > For example:
> > > }}}
<eucode>
> > > -- this code runs
> > > integer i, f
> > >
> > > i = 0
> > > f = 0
> > >
> > > if i = i + 1 then
> > > end if
> > >
> > > while f = f + 1 do
> > > end while
> > >
> > > machine_proc(26,0) -- wait_key
> > > </eucode>
{{{
> > > But...
> > > }}}
<eucode>
> > > -- this code fails with an error
> > > integer i, f
> > >
> > > i = 0
> > > f = 0
> > >
> > > if i += 1 then
> > > end if
> > >
> > > while f += 1 do
> > > end while
> > >
> > > machine_proc(26,0) -- wait_key
> > > </eucode>
{{{
> > >
> > > The same thing happens with -=, /=, *=, and
> > > &= (with sequences).
> >
> > f += 1 is not an expression. It's a statement.
> > That's why you get an error message.
>
> I see... but I thought they both worked the same?
> I mean, 'i = i + 4' produces the same result as
> 'i += 4', etc.
>
> >
> > Regards,
> > Rob Craig
> > Rapid Deployment Software
> > <a href="http://www.RapidEuphoria.com">http://www.RapidEuphoria.com</a>
>
>
> Regards,
> Vincent
Vincent,
windows allocate a 2GB of memory space to each process it create.
(This is linear virutal memory space) . So when you increase your swap file to
4 GB your application still have only 2GB addressing space. This is a
limitation
of 32Bits processors, as 32 bits pointers can only address 4GB, (windows reserve
2GB for itsef). This is why 64bits processors and windows 64 are coming
to the market now, to push that limit further.
regards,
Jacques Deschênes
