NYCPHP Meetup

[Kayra Otaner]

Hi,

I'm sorry, I forgot the ps command to observe memory from the system. I'm actually using this
command to observe memory allocation for my script instead of php getrusage calls.

# ps -v -t pts/1


PS : my script runs on tty 'pts/1', so please set your terminal number over there.


--- Kayra Otaner <kayraotaner at yahoo.com> wrote:
> Hi,
> 
> I've been trying to find the correct code to show memory usage and 'unset' feature. I was using
> Php cli version 4.1 and there was some sort of gc problem I guess. Here is a sample code, it
> basically reads a file and once in a  5000 lines it prints usage status. You'll observe that
> memory amount dedicated to script is increasing in time. If you comment 'unset()' functions in
> the
> code below, memory consumption speed will going to increase. I'm using 300 Mb of access.log file
> so you can observe memory increase after a while. I've checked same code on php cli 4.3 and
> there
> seems to be a fixed but memory dedicated to the script is still increasing after some time. 
> 
> $fp = fopen("access.log", "r");
> while ($row = fgets($fp, 10000)) :
> 	$text = $text.$row;
> 	$i++;
> 	if ($i > 5000) {
> 		print_r(getrusage());
> 		unset($text);
> 		$text = $row;
> 		unset($i);
> 		$i = 0;
> 		}
> 	unset($row);
> endwhile;
> 
> 
> Kayra Otaner
> 
> 
> --- Sterling Hughes <sterling at bumblebury.com> wrote:
> > > <paralist>This message contained 1 file(s) and is available at
> > http://nyphp.org/list/paralist_archive.php?L_mid=2111</paralist>
> > > 
> > > --- Sterling Hughes <sterling at bumblebury.com> wrote:
> > > > > Hi,
> > > > > 
> > > > > There are two simple ways to have more free memory for your scripts :
> > > > > 
> > > > > 1- You can increase memory limit from 8 Mb to any amount in php.ini file.
> > > > > 2- You can use 'unset()' function to unset unused variables right after
> > > > you use them.
> > > > >
> > > > 
> > > > err, that should only be php 3 specific, php4's reference counting
> > > > mechanism releases all
> > > > variables the second they are no longer referenced in the script.
> > > 
> > > But how would they become unreferenced without unset()ing them?
> > >
> > 
> > reference counting, that's how it works. :-)  once you no longer reference
> > a variable in your script it is destroyed.  Same applies for resources, like
> > filehandles. One they are no longer used, the files are closed.
> > 
> > http://www.zend.com/zend/art/ref-count.php
> > 
> > Now of course if you keep a lot of variables in one scope, then you should 
> > explicitly free them, but chances are, if you're code is good, it should be modularized.
> > If you really do need to deref a variable, the best way is by:
> > 
> > $var = NULL;
> > 
> > -Sterling
> > 
> > > 
> > > > > --- "Nunez, Eddy" <enunez at tiaa-cref.org> wrote:
> > > > > > 
> > > > > > This is in reference to the standard memory limit for server PHP
> > > 
> > > > scripts,
> > > > > > which is 8MB.
> > > > > > 
> > > > > > My question is...
> > > > > > is there any function to query available free space in the memory pool?
> > > 
> > > Maybe getrusage() would be handy, and I've attached a cheesy example I've
> > > used to quickly profile scripts, and the posix_* functions look good, too. 
> > > Plus, you could always run the UNIX commands and parse the output for mem
> > > usage, what's free, etc on a system wide basis.
> > > 
> > > 
> > > =====
> > > Hans Zaunere
> > > President, New York PHP
> > > http://nyphp.org
> > > hans at nyphp.org
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > --- Unsubscribe at http://nyphp.org/list/ ---
> > 
> > 
> 
> 
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