Combine vhosts httpd logs in one file?

[fearz]

Hi,

I'm trying to identify what is causing httpd load (by which client) - the only way for me to do it right now is to check each log file for each domain/client manually by accessing their access_log files found in /var/www/vhosts/<domainname>/statistics/logs/access_log

Is there anyway to combine ALL clients' log files in one file so it can be easier for me to track down what is causing the load or like an alternative way to find which domain is causing httpd load?

Thanks