http://www.macworld.com/article/2981585/operating-systems/how-to-make-a-bootable-os-x-10-11-el-capitan-installer-drive.html
http://www.macworld.com/article/2990837/storage/how-to-format-a-startup-drive-in-el-capitan.html
http://www.macworld.com/article/1167870/software-system/hands-on-with-mountain-lions-os-x-recovery-and-internet-recovery.html
macosx
Install with Nomebrew:
brew install siege
Than run with needed concurrent connections:
siege -c N http://snake.mk.ua
Press Ctrl+C
to stop testing and print statistics.
Project web-site: JoeDog
macosx
qa
perfomance
OS X Yosemite and later
Use the following Terminal command to reset the DNS cache in OS X v10.10.4 or later:
sudo killall -HUP mDNSResponder
Use the following Terminal command to reset the DNS cache in OS X v10.10 through v10.10.3:
sudo discoveryutil mdnsflushcache
OS X Mavericks, Mountain Lion, and Lion
Use the following Terminal command to reset the DNS cache in OS X v10.9.5 and earlier:
sudo killall -HUP mDNSResponder
Mac OS X Snow Leopard
Use the following Terminal command to reset the DNS cache in OS X v10.6 through v10.6.8:
sudo dscacheutil -flushcache
macosx