Alan Boudreault wrote:
Hi all,
I'm wondering why PHP doesn't free my memory with this test code. The
memory usage is always the same even if i unset my object. The Garbage
collector seems to only free the memory at the end of the script.
Here's the php Scripts that i use for testing:
<?php
//dl("php_mapscript.so");
function test() {
$oShapeFile = ms_newShapefileObj(
"/opt/www/bdga/msp/data/bdga/BDGA_HYDRO_S_POLY.shp", -1);
echo "before getShape : ".memory_get_usage(true)."\n";
for ($i=0; $i<$oShapeFile->numshapes;$i++) {
$oShape = $oShapeFile->getShape($i);
$oShape->free();
unset($oShape);
$oShape = NULL;
}
echo "after getShape : ".memory_get_usage(true)."\n";
$oShapeFile->free();
unset($oShapeFile);
$oShapeFile = null;
echo "after free : ".memory_get_usage(true)."\n";
}
echo "start : ".memory_get_usage(true)."\n";
test();
echo "end : ".memory_get_usage(true)."\n";
?>
Output result:
start : 262144
before getShape : 262144
after getShape : 11010048
after free : 11010048
end : 11010048
I've also run valgrind to be sure that is not my extension that doesn't
free its memory:
$ valgrind --leak-check=full php -f shapeTest.php
==18730== LEAK SUMMARY:
==18730== definitely lost: 0 bytes in 0 blocks.
==18730== possibly lost: 0 bytes in 0 blocks.
==18730== still reachable: 240 bytes in 2 blocks.
==18730== suppressed: 0 bytes in 0 blocks.
Thanks,
Alan
interesting, I'm finding the same thing in one of my atom feed parsers;
over time no matter how much I unset / truncate variables the memory
usage stills grows over time - at this time I can't find any way to
bring it right down; on a timer the whole script resets and restarts itself;
one thing I have noticed is that I can see the emalloc memory usage
report dropping and rising [memory_get_usage( false );], but still
rising over time..
hope this wasn't a hijack; just here trying to figure out the same
problem at the minute!
Regards..
Nathan
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