How to find hugepage size on system?

Question

I am getting following two different result. which one i should consider for Hugepage?

[root@server ~]# getconf PAGESIZE
4096
[root@server ~]# grep -i hugepagesize /proc/meminfo 
Hugepagesize:     2048 kB

My kernel on CentOS 7.1

Linux localhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30 12:09:22 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Rui F Ribeiro · Accepted Answer · 2015-11-17 21:24:50Z

0

Obviously for Hugepage is Hugepagesize. PAGESIZE is for (non-huge) pages in virtual memory.

I will leave an URL explaining it better:

Other tidbits:

shmall determines the total amount of shared memory to be allocated using its value multipled by the OS pagesize.

"pagesize = getconf PAGE_SIZE"

"Divide the SHMMAX value by the Hugepagesize to get SHMALL"

answered Nov 17 '15 at 20:54

Rui F Ribeiro

40.5k1689150

i need correct value because i am calculating kernel.shmmax and kernel.shmall so i want to know which value i should consider – Satish Nov 17 '15 at 21:06
Post edited for clarity. – Rui F Ribeiro Nov 17 '15 at 21:12
insteresting, just adding some tidbits. – Rui F Ribeiro Nov 17 '15 at 21:18
so pagesize will be multipled and total result of that divide by Hugepagesize very interesting... – Satish Nov 17 '15 at 21:30
Just a few tidbits I got here and there. I recommend you to follow the official Oracle documentation. – Rui F Ribeiro Nov 17 '15 at 21:32

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