In case your Jenkins CI fails to complete building your project but only logging the following: ERROR: Maven JVM terminated unexpectedly with exit code 137 It means maven does NOT have enough memory available. To solve this, simply increase your MAVEN_OPTS memory. Or you may need to increase your system's memory. This is very likely if you run your Jenkins on a virtual machine and you are stingy of memory.
The lsof command is available only to root. Anyway, if you want to run it as a normal user, you can specify its full path: $ /usr/sbin/lsof /path/to/some/file Or $ sudo -i lsof /path/to/some/file Or else: sudo dnf install lsof Or sudo yum install lsof
Enter a URL to test the load time of that page, analyze it and find bottlenecks http://tools.pingdom.com/fpt https://developers.google.com/speed/pagespeed/insights/