RE: how to monitor memory usage on freebsd systems

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; [email protected]
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; [email protected]
	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
		




	-- 
	Chee Meng Gui
	Function Engineering
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-- 
Chee Meng Gui
Function Engineering
650-833-0660


http://www.vital-group.com      - Dedicated to business communications.
http://www.vital-storage.com    - Secure easy-to-use remote backups for business critical data.

The information contained in this message is intended for the addressee only and may contain confidential and/or privileged information.If you are not the addressee, please delete this message and notify the sender; you should not copy or distribute this message or disclose its contents to anyone.Any views or opinions expressed in this message are those of the author and do not necessarily represent those of The Vital International Group or any of its affiliates.No reliance may be placed on this message without written confirmation from an authorised representative of its contents.

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08/14/08 09:13:13

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