I get a error

I did a pressture test. use apache ab tool and use 100k time in total and 150 Concurrent Connections. And then I visited the piwik page, getting the message below.

Live visitors!

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 71 bytes) in /data0/htdocs/www/piwik/piwik/core/DataTable.php on line 1010

Is there anyone could tell me what happend?

Have you tried increasing your php memory limit ?

In php.ini :

memory_limit = 512M


memory_limit = 1024M

The Live visit need to speed so much memory?
Maybe I should close this function on my site.