|
|
Posted by comp.lang.php on 09/26/06 18:09
Simon Stewart wrote:
> Phil
>
> yes that's far in pixels smaller than when I had problems
> the 8Mb memory_limit you have for PHP is low. Hosting companies often
> allocate 16 or 32Mb.
> have you tried doing memory_get_usage calls before the problem code? Could
> the program or environment be short on memory anyway?
>
I was suspecting that most places use more than 8mb default memory;
however, it appears customized as our servers here come "out of the
box" with RHEL 4 which sets the memory_limit within php.ini to 8mb.
It's easy to fix that, of course, but just thought I'd share.
I wrote some code that apparently seems to solve the memory issue:
[PHP]
$mem = memory_get_usage();
list($width, $height) =
@getimagesize(actual_path(realpath("$this->locationPath/$this->fileName")));
if ($willIncreaseMemory && (int)ini_get('memory_limit') * 10 *
@filesize(actual_path("$this->locationPath/$this->fileName")) > $mem) {
@ini_set('memory_limit', ceil((int)ini_get('memory_limit') * 10 *
filesize(actual_path("$this->locationPath/$this->fileName")) / 100000)
.. 'M');
} elseif ($willIncreaseMemory && (int)$width > 0 && (int)$height >
0) {
@ini_set('memory_limit', ceil((int)$width * (int)$height * 5 /
10000) . 'M');
}
[/PHP]
> Simon.
>
> "comp.lang.php" <phillip.s.powell@gmail.com> wrote in message
> news:1159281310.958733.46560@e3g2000cwe.googlegroups.com...
> >
> > Simon Stewart wrote:
> >> Andy
> >>
> >> What size is the image you are loading in megaPIXELS?
> >> This is often the limiting factor in PHP GD processing, not the original
> >> size in Kb or the final size in Kb.
> >> When I ran into this I found that PHP stopped abruptly with an error
> >> message.
> >>
> >
> > The GIF image is Size: 332 x 287 px = 95284 sq px which is less than
> > 0.1 sq mpx
> >
> > in other words, a tiny image
> >
> > Phil
> >
> >> -- Simon
> >>
> >>
> >> "comp.lang.php" <phillip.s.powell@gmail.com> wrote in message
> >> news:1159234304.867023.36210@e3g2000cwe.googlegroups.com...
> >> >
> >> > Andy Hassall wrote:
> >> >> On 25 Sep 2006 13:41:02 -0700, "comp.lang.php"
> >> >> <phillip.s.powell@gmail.com>
> >> >> wrote:
> >> >>
> >> >> >I have an image that's only 100K in size, and I am working with 8mb
> >> >> >of
> >> >> >memory. If I do this:
> >> >> >
> >> >> >[PHP]
> >> >> >print_r(ceil((int)ini_get('memory_limit') * 10 *
> >> >> >filesize(actual_path("$locationPath/$this->fileName")) / 1000000) .
> >> >> >'M'); // PRINTS OUT "2M" for 2mb
> >> >> >]/PHP]
> >> >>
> >> >> Maybe I'm having a dense moment, but what does this value even mean?
> >> >> memory_limit times 10 times size of file then divided by a million?
> >> >>
> >> >> Is the output actually "2M" ? If you have a 100,000 byte file,
> >> >> doesn't
> >> >> that
> >> >> mean your memory_limit is set to "2" ? (presumably "2M", turning into
> >> >> "2"
> >> >> after
> >> >> the cast to int).
> >> >>
> >> >
> >> > Ok I'll make it super simple because I have to explain it so that I
> >> > understand. I want to increase memory because "8M" is 8mb which for
> >> > some images is not enough memory to run imagecreatefromjpeg, or
> >> > imagecreatefromgif or imagecreatefrompng.. so I am going to increase it
> >> > from 8MB to something like "130mb" or "130M" if need be for very large
> >> > images. It works every time, even if it's an eventual bad idea.
> >> >
> >> > However, this image is 87KB in size and if I use the same formula to
> >> > "increase memory", instead I "decrease memory instead"
> >> >
> >> >> >The image itself requires far less than the maximum amount of memory
> >> >> >required.
> >> >> >
> >> >> >However, the moment I do this:
> >> >> >
> >> >> >[PHP]
> >> >> > $imagestring =
> >> >> >@file_get_contents(actual_path(realpath("$locationPath/" .
> >> >> >$this->{$section . '_name'})));
> >> >> >[/PHP]
> >> >> >
> >> >> >It locks up and forces a download of "index.php" (which indicates to
> >> >> >me
> >> >> >that the memory allotment of 8mb has been used up).
> >> >>
> >> >> That seems like a guess... what error messages do you get? If you
> >> >> can't
> >> >> see
> >> >> them, change the content-type of the output back to text.
> >> >
> >> > I see no errors not even in the PHP error log, absolutely nothing is
> >> > logged. Tried changing content-type to text/plain, to no avail, still
> >> > force-downloads index.php
> >> >
> >> >>
> >> >> >How in the world can a 100KB image that uses only 2mb of 8mb use up
> >> >> >8mb
> >> >> >of memory on file_get_contents() alone? I'm completely confused!
> >> >>
> >> >> Why would a 100KB image use 2MB? Where did 8MB come from? I'm also
> >> >> confused...
> >> >
> >> > Sorry but I have no idea whatsoever. Can someone else elaborate?
> >> >>
> >> >> The usual pitfall is that a 100KB image can easily decompress to
> >> >> several
> >> >> megabytes, and that GD uses even more memory than you might expect.
> >> >>
> >> >> --
> >> >> Andy Hassall :: andy@andyh.co.uk :: http://www.andyh.co.uk
> >> >> http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis
> >> >> tool
> >> >
> >
Navigation:
[Reply to this message]
|