My Piwik instance manage more than 9000 websites at the moment, and this number is likely to much more important in a few weeks.
When I go to URL /index.php?module=SitesManager&action=index, I get a blank page and this error in the log :
PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 23746969 bytes) in /.../core/SmartyPlugins/outputfilter.cachebuster.php on line 50
Looking at the code, it seems to be a preg_* problem since the source string is more than 11MB long.
I temporary raise up the memory_limit to 512M in php.ini as a quick workaround.
Keywords: memory preg
expected problem until we add pagination to the page. See also: #3124