Re: Monitoring Memory

[Christopher McCrory <chrismcc pricegrabber com>]

On Wed, 2004-06-09 at 16:46, Kevin Stussman wrote:
> I have been looking at /proc/meminfo and /proc/slabinfo trying to figure
> out what is meaning to a swapping problem that we are experiencing. It
> seems like we have tons of cache memory, but when new memory is needed
> the OS starts to swap.
> 

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=89226


[chrismcc@ chrismcc]$  tail /etc/sysctl.conf
 
# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1
# "Just In Case", reboot on panic
kernel.panic = 1
 
# temporary
 
vm.pagecache = 1 10 20




> By using the meminfo and slabinfo, what are some meaningful values to be
> monitoring? I'm trying to make some sense of how things add up but i'm
> not having much luck beyond the basics. For example, I would have
> thought that (Inactive + Active + Free) = Total or something like that,
> but no (these values will end up on a graph in cacti).
> 
> The documentation for the fields in meminfo and slabinfo is not very
> good and for this monitoring tool, I cannot use sar or free (it has to
> be file based hence /proc).
> 
> Regards,
> 
> Kevin.
> 
> --------------
> 
>         total:    used:    free:  shared: buffers:  cached:
> Mem:  6208667648 6173192192 35475456        0 66961408 5790060544
> Swap: 8587108352 265879552 8321228800
> MemTotal:      6063152 kB
> MemFree:         34644 kB
> MemShared:           0 kB
> Buffers:         65392 kB
> Cached:        5552276 kB
> SwapCached:     102080 kB
> Active:        4612504 kB
> ActiveAnon:    2542240 kB
> ActiveCache:   2070264 kB
> Inact_dirty:    892520 kB
> Inact_laundry:  140268 kB
> Inact_clean:    127828 kB
> Inact_target:  1154624 kB
> HighTotal:     5242816 kB
> HighFree:        16132 kB
> LowTotal:       820336 kB
> LowFree:         18512 kB
> SwapTotal:     8385848 kB
> SwapFree:      8126200 kB
> HugePages_Total:     0
> HugePages_Free:      0
> Hugepagesize:     2048 kB
> 
> 
> 
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-- 
Christopher McCrory
 "The guy that keeps the servers running"
 
chrismcc pricegrabber com
 http://www.pricegrabber.com
 
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