def use_noop_scheduler():
"""Switches from deadline to noop scheduler of processes for the kernel.
Noop minimizes CPU usage of the scheduler.
"""
ensure_line('/boot/cmdline.txt', 'deadline', 'noop')
def set_swapsize(size=100, swappiness=1, cache_pressure=50):
"Specifies the raspberry pi's swap size, usage, and swap file cache."
if size > 0:
sudo('echo "CONF_SWAPSIZE={0}" > /etc/dphys-swapfile'.format(size))
sudo('dphys-swapfile setup')
sudo('dphys-swapfile swapon')
else:
sudo('swapoff -a')
ensure_line('/etc/sysctl.conf', 'vm.swappiness=[0-9]*', 'vm.swappiness={0}'.format(swappiness))
ensure_line('/etc/sysctl.conf', 'vm.vfs_cache_pressure=[0-9]*', 'vm.vfs_cache_pressure={0}'.format(cache_pressure))
def disable_ipv6():
"Disable IPv6."
sudo('echo "net.ipv6.conf.all.disable_ipv6=1" > /etc/sysctl.d/disableipv6.conf')
ensure_line("/etc/modprobe.d/blacklist", "blacklist ipv6")
sudo("sed -i '/::/s%^%#%g' /etc/hosts")
