Dear Internals,
During development of DocBlox I encountered a (for me) unusual
situation
with regards to memory usage.
I hope you can shed some light on this for me as I do not understand.
The situations is as follows:
I have a php file containing about 53 KLOC (including whitespace and
comments), which is about 2.1MB in size. When I execute the
memory_get_peak_usage after running the token_get_all method on its
content it reports that 232MB of RAM have been used in the process.
I am having trouble understanding how 244003984B (232MB) RAM could be
used.
The following is what I have calculated:
* 640.952B to start with (measured);
* 2.1MB to load the file contents into memory using file_get_contents
* 68 bytes for the resulting array
* 68 bytes for each child array representing a token
* 68 bytes for each element in a token array (which can be either 1 or
3, depending whether it is actually a token or literal)
* 2.1MB in total for the string contents of the token literals /
contents (equivalent to the byte size of the file)
I have used the count method to retrieve the number of tokens (276697)
and come to the following sum (everything is retrieved and calculated
in
bytes):
640952+2165950+68+(276697*68)+(276697*3*68)+2165950=80234436 = 76M
This is a worst case formula where I assume that every token in the
array consists of 3 elements.
Based on this calculation I would be missing 156MB of memory; anybody
know where that went?
I used the following snippet of code for my tests:
var_dump(memory_get_peak_usage());
$tokens = token_get_all(file_get_contents('<PATH>'));
var_dump(count($tokens));
var_dump(memory_get_peak_usage());
I hope this mail did not scare anyone ;)
Kind regards,
Mike van Riel
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