(shmall*PAGE_SIZE)which is 8 GB.
PAGE_SIZEis usually 4096 bytes unless you use Chapter 14, Large Memory Optimization, Big Pages, and Huge Pages which supports the configuration of larger memory pages.
PAGE_SIZEis on your Linux system, you can run the following command:
$ getconf PAGE_SIZE 4096
# cat /proc/sys/kernel/shmall 2097152
procfile system without reboot:
# echo 2097152 > /proc/sys/kernel/shmall
sysctl(8)to change it:
# sysctl -w kernel.shmall=2097152
/etc/sysctl.conf. This file is used during the boot process.
# echo "kernel.shmall=2097152" >> /etc/sysctl.conf