Doctrine appears to be taking well over 4MB of RAM to execute a single, simple query:

print memory_get_peak_usage()." <br>\n";
$q = Doctrine_Query::create()
    ->from('Directories d')
    ->where('d.DIRECTORY_ID = ?', 5);

$dir = $q->fetchOne();
print $dir['name']." ".$dir['description']."<br>\n";

print memory_get_peak_usage()." <br>\n";

/***************  OUTPUT:  **************************

6393616
testname testdescription
10999648

/***************************************************/

This is on a test database with very little data in it - the item that I am querying doesn't contain any data other than what is displayed here.

Is there potentially something wrong with the way I have the system set up, or is this standard memory usage for Doctrine?

Accepted Answer

From what I can see, you code doesn't seem to be wrong...


As a test, I've set up a quick example, with a very simple table (only four fields).

Here is the relevant code :

var_dump(number_format(memory_get_peak_usage()));

$test = Doctrine::getTable('Test')->find(1);

var_dump(number_format(memory_get_peak_usage()));

When doing that, I have this kind of output :

string '1,316,088' (length=9)
string '2,148,760' (length=9)

Considering the table is really simple and that I am only fetching one line, it seems "much" to me too -- but that's quite consistent with what you are getting, and with what I saw on other projects :-(


If you only need to display your data, and not work with it (ie update/delete/...), a solution might be to not fetch complex objects, but only a simple array :

$test = Doctrine::getTable('Test')->find(1, Doctrine::HYDRATE_ARRAY);

But, in this case, it doesn't make much of a difference, actually :-( :

string '1,316,424' (length=9)
string '2,107,128' (length=9)

Only 40 KB of difference -- well, with bigger objects / more lines, it might still be a good idea...


In the Doctrine manual, there is a page called Improving Performance ; maybe it could help you, especially for these sections :


Oh, btw : I did this test on PHP 5.3.0 ; maybe this can have an impact on the amount of memory used...

Written by Pascal MARTIN
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