优化jvm之系统参数

ulimit --------------
data seg size (kbytes, -d) unlimited
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 206129
stack size (kbytes, -s) 2048 #This ALSO affects -Xss !!!
max user processes (-u) 16379
virtual memory (kbytes, -v) unlimited

/etc/sysctl.com --------------------
vm.nr_hugepages=1790
kernel.shmmax=3758096384
kernel.shmall=3758096384
#don't forget to do:
# mkdir /mnt/hugepages
# mount -t hugetlbfs nodev /mnt/hugepages
# chmod 777 /mnt/hugepages

/ect/fstab

---

none /dev/shm tmpfs defaults,size=4G 0 0

Validation:

cat /proc/meminfo | grep Huge
HugePages_Total: 1790
HugePages_Free: 462
Hugepagesize: 2048 kB

cat /proc/mounts
none /dev/shm tmpfs rw 0 0
nodev /mnt/hugepages hugetlbfs rw 0 0