Linux中Huge Pages的相关设置有哪些

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PostgreSQL通过参数huge_pages设置是否启用大页，利用常驻内存用以提升性能

Check if CPU supports HugePages 2MB Size
命令如下，关键字是pse(Page Size Extension)

[root@localhost ~]# cat /proc/cpuinfo | grep pse | uniqflags   : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm fsgsbase smep arat[root@localhost ~]# [root@localhost ~]#cat /proc/cpuinfo | egrep -o pse | head -n 1pse[root@localhost ~]#

Check if CPU supports HugePages 1GB Size
命令如下，关键字是pdpe1gb

[root@localhost ~]# grep pdpe1gb /proc/cpuinfo | head -n 1flags   : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon nopl xtopology tsc_reliable nonstop_tsc pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm fsgsbase smep arat[root@localhost ~]# [root@localhost ~]# egrep -o pdpe1gb /proc/cpuinfo | head -n 1pdpe1gb[root@localhost ~]#

How to change default HugePage size?
默认大小为2MB

[root@localhost ~]# grep Hugepagesize: /proc/meminfoHugepagesize:       2048 kB[root@localhost ~]#

修改命令为

[root@localhost ~]# grep GRUB_CMDLINE_LINUX /etc/sysconfig/grubGRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"[root@localhost ~]# [root@localhost ~]# vim /etc/sysconfig/grub[root@localhost ~]# grep GRUB_CMDLINE_LINUX /etc/sysconfig/grubGRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet  default_hugepagesz=1G"[root@localhost ~]# [root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfgGenerating grub configuration file ...Found linux image: /boot/vmlinuz-5.2.14-1.el7.elrepo.x86_64Found initrd image: /boot/initramfs-5.2.14-1.el7.elrepo.x86_64.imgFound linux image: /boot/vmlinuz-3.10.0-957.27.2.el7.x86_64Found initrd image: /boot/initramfs-3.10.0-957.27.2.el7.x86_64.imgFound linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.imgFound linux image: /boot/vmlinuz-0-rescue-f0b4bffdc9e44816abd201320f8a4f75Found initrd image: /boot/initramfs-0-rescue-f0b4bffdc9e44816abd201320f8a4f75.imgdone[root@localhost ~]# [root@localhost ~]# rebootConnection closed by foreign host.[root@localhost ~]# grep Hugepagesize /proc/meminfoHugepagesize:    1048576 kB[root@localhost ~]#

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