기록's

swappiness변경

sysctl vm.swappiness

echo 0 > /proc/sys/vm/swappiness


vi /etc/sysctl.conf

cat /etc/sysctl.conf | grep swappiness


# swap
vm.swappiness = 0
#vm.swappiness = 60

ulimit의 open files 변경

1. add end of line
# vi /etc/sysctl.conf

# open files in Linux

fs.file-max = 65536


2. add end of line
# vi /etc/security/limits.conf



root        soft    nofile           64000
root        hard    nofile           64000
root        soft    nproc            64000
root        hard    nproc            64000

65536에 설정하는 경우
root        soft    nofile           65536
root        hard    nofile           65536
root        soft    nproc            65536
root        hard    nproc            65536

root        soft    nofile           65500
root        hard    nofile           65500
root        soft    nproc            44769
root        hard    nproc            44769

최대 이용자 수 변경

ulimit -u 65536

최대 오픈 파일 수 변경

ulimit -n 65536

ulimit-a에서 확인

overcommit_memory 확인

sysctl vm.overcommit_memory

vm.overcommit_memory의 값을 1로 변경

echo 1 > /proc/sys/vm/overcommit_memory
sysctl -w vm.overcommit_memory=1
cat /proc/sys/vm/overcommit_memory

overcommit memory설정

# vi /etc/sysctl.conf



# overcommit memory
vm.overcommit_memory = 1

vm.overcommit_ratio = 99

transparent_hugepage비활성화

echo never > /sys/kernel/mm/transparent_hugepage/enabled

echo never > /sys/kernel/mm/transparent_hugepage/defrag