I'll try and see what I can do about this. Andi
At 11:56 AM 12/8/2002 -0800, Tom Fishwick wrote:
I was reading an email from stdin. But regardless of bad coding style
:-), the script is using _way_ more memory than it should.
$s = '';
while(strlen($s) < 266768) {
$s.= 'd';
}
this code uses 151Megs on my system. the same code uses about 2megs with
php4.3. php4.3 seems to realloc/memcpy when the string gets big, and
php5 just does malloc's and memcpy's (I don't see calls to free()
though). I'm thinking the problem might be in zend_mm_realloc?
Tom
Andi Gutmans <[EMAIL PROTECTED]> wrote:
>
> At 12:30 AM 12/8/2002 -0800, Tom wrote:
> >hey there,
> >
> >I'm using the cvs and ZE2, there seems to be some huge memory usage when
> >concatenating a string to a length over 262080 bytes, when the string
> >length gets to that size the malloc call inside
> >zend_mm_add_memory_block starts grabing memory 262168 bytes at a time,
> >every 8th concatenation (i'm concatenating 1 byte at a time).
> >
> >anyone else seen this?
>
> It makes sense that this is happening to you. Reaching the point where you
> add to a string of such size is very bad coding practice (unless you really
> have no choice). This is because if the memory manager can't realloc() (it
> very often can't) then it'll have to allocate a new block and use a
> memcpy() to copy over all of the string.
> The current code is less than optimal in this case and I can choose various
> strategies to improve on it but there will always be times where the
> malloc()/memcpy() will be necessary.
> So what are you doing? Is it something you have to do?
> Andi
>
>
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