How much memory is used according to sysctl?
Which memory is sysctl measuring?
Please remember Physical Mem. = Hardware memory i.e. the RAM in the
system.
and
Real Memory = memory available to user processes.
and just to make it confusing
Some systems use Real Memory instead of Physical memory and Virtual
Memory instead of Real memory.
I don't use BSD so can't comment on that but a quick look at our servers
shows differences in memory
Solaris 7 = Real Memory
Solaris 9 = Physical Memory and Virtual Memory
Solaris 10 = Real Memory
CentOS 5.1 = Physical memory and Virtual Memory
Red Hat 7.2 = Real Memory and Memory buffers
SuSE = Real Memory and Memory Buffers
________________________________
From: Chee Meng Gui [mailto:[EMAIL PROTECTED]
Sent: 13 August 2008 17:05
To: Hampton, Michael
Cc: Dave Shield; net-snmp-users@lists.sourceforge.net
Subject: Re: how to monitor memory usage on freebsd systems
Thanks Michael for the reply.
But the total memory used was definitely not more than 10%.
I checked sysctl and it was less than 10%.
So the hrStorageUsed figure is incorrect.
Is there something wrong with the net-snmp implementation for Freebsd?
Regards
cm_gui
On Wed, Aug 13, 2008 at 12:54 AM, Hampton, Michael
<[EMAIL PROTECTED]> wrote:
Total Memory Used = (hrStorageUsed / hrStorageSize) * 100
Physical memory = (117279 / 128596) * 100 = 91%
Real memory = (103978/121008) * 100 = 85%
________________________________
From: Chee Meng Gui [mailto:[EMAIL PROTECTED]
Sent: 12 August 2008 22:55
To: Dave Shield
Cc: Hampton, Michael; net-snmp-users@lists.sourceforge.net
Subject: Re: how to monitor memory usage on freebsd systems
Sorry , actually have to multiply the hrStorageUsed by the
AllocationUnits, i.e.
1172379 x 4096.
So actually almost all the Physical and Real memories are used!
But this is definitely not the case.
So how to get the total memory used on a Freebsd system from
snmp?
thank you.
hrStorageIndex hrStorageType
hrStorageDescr hrStorageAllocationUnits hrStorageSize hrStorageUsed
hrStorageAllocation
Failures
1 HOST-RESOURCES-TYPES::hrStorageRam Physical
memory 4096 Bytes 128596 117279 0
2 HOST-RESOURCES-TYPES::hrStorageRam Real
memory 4096 Bytes 121008 103978 0
On Tue, Aug 12, 2008 at 2:21 AM, Dave Shield
<[EMAIL PROTECTED]> wrote:
2008/8/12 Chee Meng Gui <[EMAIL PROTECTED]>:
> So the hrStorageEntry.hrStorageUsed.1 is in
kilobytes?
hrStorageUsed is reported in the units specified in
hrStorageUnits.
So if hrStorageUnits.1 is 1024, then hrStorageUsed.1 is
in Kb
> When I checked this result against the used memory
output of sysctl {
> hw.physmem - ( ( vm.stats.vm.v_inactive_count +
vm.stats.vm.v_cache_count +
> vm.stats.vm.v_free_count ) * hw.pagesize ) } , the two
were not equal.
On FreeBSD with the latest (5.4.x) agent, "Physical
memory" is
retrieved by running sysctl on HW_USERMEM. Most of the
other
values are calculated by running sysctl on VM_METER
See 'agent/mibgroup/hardware/memory/memory_freebsd.c'
for the details.
Dave
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confirmation from an authorised representative of its contents.
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Brentwood, Essex, CM14 4SX.Company registration number - 45022560.
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