Slow code

Hello Joseluis,

nice Article and interesting caching technique.

When I have to analyse code for performance issues I mostly use logging methods. It's easy to extend these (often given) loggers with some performance functionality like memory usage an script execution time.

Something like this I use to log:

$this->justLog((microtime(true) - $_SERVER['REQUEST_TIME_FLOAT']).'s @' . $this->getMemoryUsage().'MB: in function X before calling function Y', $arrayOfFurtherInformation);

With this method I divide the code to look at into smaller pieces to faster find slowing parts. I also prevent XDebug from falsifying my measurements...


Best regards,
Gerald

Hi Gerald.

You are right.

But, be in mind that the example that I'll expose in the second part it's based on the console, as a server task or something like that. And, in this case I'm not sure if could be applied your notes. But I'll try, of course.

Related with the memory usage I have a version in local that uses php native functions to limit the amount of data cached. The target: prevent hang of the script, but all my tests didn't improve the speed because the memory_usage introduces lags. I'm very interested in how you are implemented your $this->getMemoryUsage().

Thank you so much for your comments.

Hey Joseluis,

I also mainly use the php native function memory_get_usage(), but it has an fallback that could be interesting for you.
I found it on stackoverflow:
stackoverflow.com/questions/2290611 ...
The post of Alix Axel also reads the memory usage the running OS determines:
exec('ps -eo%mem,rss,pid | grep ' . getmypid(), $output);
And have a look at the comment of greg on Alix' post...

I look forward to your second part