%memused is high Post: 302992153

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Operating Systems Linux Red Hat %memused is high Post 302992153 by rbatte1 on Wednesday 22nd of February 2017 06:52:50 AM

02-22-2017

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I would focus more on the swap/page rates. If you are swapping/paging because you have exhausted real memory, then you will start to feel the performance cost of swapping/paging. What output do you get from vmstat? You might try it with time & count paramters such as vmstat 10 5 giving you ten second intervals for a count of five, although the first is usually counted since last boot.

The columns you are looking for are under the swap heading, probably the si & so sub-headings, although the columns are usually skewed.

Swap in (si) is recalling from disk memory that was still needed, but least active.
Swap out (so) is writing to disk memory that is still needed, but least active.

Does this reveal anything?

You don't say what the services are that are degraded. If you have a database, that will have a configuration file where you can adjust various parameters, including memory allocations. If set too low, these can cause performance problems within the database. If set too high, they can cause problems for the OS. Most people assume that larger is better, but it has to be within the confines of the server you have. One item in particular is often referred to as resident or pinned memory which cannot be swapped. This is for the performance of the database but if you set it too high there may be insufficient left for the OS to perform other normal work, which can leave your database degraded too, depending on what is happening.

If you are worrying about the VMWare host, have you over-provisioned the memory of your guests? (if that is even possible) It's the same consideration for a server with a database on it in a way.

I hope that this gives you something to work with.
Robin

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LEARN ABOUT REDHAT

vmstat

VMSTAT(8)						   Linux Administrator's Manual 						 VMSTAT(8)

NAME

       vmstat - Report virtual memory statistics

SYNOPSIS

       vmstat [-n] [delay [ count]]
       vmstat[-V]

DESCRIPTION

       vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity.

       The  first report produced gives averages since the last reboot.  Additional reports give information on a sampling period of length delay.
       The process and memory reports are instantaneous in either case.

   Options
       The -n switch  causes the header to be displayed only once rather than periodically.

       delay is the delay between updates in seconds.  If no delay is specified, only one report is printed with the average values since boot.

       count is the number of updates.	If no count is specified and delay is defined, count defaults to infinity.

       The -V switch results in displaying version information.

FIELD DESCRIPTIONS

   Procs
       r: The number of processes waiting for run time.
       b: The number of processes in uninterruptable sleep.
       w: The number of processes swapped out but otherwise runnable.  This
	  field is calculated, but Linux never desperation swaps.

   Memory
       swpd: the amount of virtual memory used (kB).
       free: the amount of idle memory (kB).
       buff: the amount of memory used as buffers (kB).

   Swap
       si: Amount of memory swapped in from disk (kB/s).
       so: Amount of memory swapped to disk (kB/s).

   IO
       bi: Blocks sent to a block device (blocks/s).
       bo: Blocks received from a block device (blocks/s).

   System
       in: The number of interrupts per second, including the clock.
       cs: The number of context switches per second.

   CPU
       These are percentages of total CPU time.
       us: user time
       sy: system time
       id: idle time

NOTES

       vmstat does not require special permissions.

       These reports are intended to help identify system bottlenecks.	Linux vmstat does not count itself as a running process.

       All linux blocks are currently 1k, except for CD-ROM blocks which are 2k.

FILES

       /proc/meminfo
       /proc/stat
       /proc/*/stat

SEE ALSO

       ps(1), top(1), free(1)

BUGS

       Does not tabulate the block io per device or count the number of system calls.

AUTHOR

       Written by Henry Ware <al172@yfn.ysu.edu>.

Throatwobbler Ginkgo Labs					   27 July 1994 							 VMSTAT(8)