Hi, If you look at the full free output you will see another line: total used free shared buffers cached Mem: 8057004 7491980 565024 0 234592 2005452 -/+ buffers/cache: 5251936 2805068 The +/- buffers/cache tells you how much memory you will have available after you (the kernel) clean all buffers and caches. And that is the number we look at. -- Martin Sivák msivak@redhat.com Red Hat Czech RHEV-M SLA / Brno, CZ ----- Original Message -----
On Wed, Sep 10, 2014 at 11:57:05PM +0300, Mohyedeen Nazzal wrote:
Hi All, I have noticed that there is a huge difference between memory reading obtained from top or free commands, and values displayed on ovirt engine. "Host "
Example: Engine Version : *ovirt-engine-3.4.3-1.el6.noarch* *OS: Centos 6.5_x86_64*
*Used Memory:* *from free:* [root@oVirt ~]# free total used free shared buffers cached Mem: 65890412 65609864 280548 0 305408 53759412
from Egnine Webpage:
only 12G is being used.
Is there an explanation for this ?
It's a Linux thing. When a file is opened, it is mapped into memory, but when it is closed Linux does not evict it before memory is released again. Thus, a long-running active host reaches 0 free mem sooner than later.
For oVirt GUI, we found this misleading - there, "free" means "how much memory is available for new VMs to use". Therefore oVirt reports "buffred" and "cached" memory as free, too. _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users