Add user to group linux
Append user to multiple groups without removing existing ones
usermod -aG docker,sudo alice
more linux
all 133 commands →
Show /proc memory maps
cat /proc/<pid>/smaps | awk '/^Size/{sum+=$2} END{print sum/1024" MB"}'
Anonymous huge pages status
grep -E 'HugePages|AnonHugePages|Transparent' /proc/meminfo
Disable Transparent Huge Pages
echo never > /sys/kernel/mm/transparent_hugepage/enabled
Show NUMA topology
numactl --hardware
TCP tuning: increase backlog
sysctl -w net.core.somaxconn=65535 net.ipv4.tcp_max_syn_backlog=65535