12-29-2016
You have no CPU shortage at all, but the server is heavily misconfigured: it is one small step away from swapping to death. The high numbers in "fr" and "sr" are signs that memory is on the brink of being exhausted and the system is already scanning frantically for places which can be swapped out in case. The chock full blocked-queue and the wait% in the CPU section come from the system having to wait for I/O. This would be OK if the presented snapshot is from a backup cycle (where only I/O counts and the system is normally bound by that) but if this is the usual state of affairs the system would greatly profit from more I/O-capacity (like a better network connection, faster disks, etc. - where exactly the bottleneck in I/O is doesn't show up in the picture).
I don't know for sure but if this is an Oracle system you most probably have the SGA configured too big. Reduce it in size (or add memory, with the same effect) and add I/O capacity and you probably can take away ~3-4 processors without the performance being altered at all, perhaps even better.
You might want to read the
Performance Tuning Introduction i wrote for an in-depth explanation of what is going on in your system.
I hope this helps.
bakunin
Last edited by bakunin; 12-29-2016 at 11:53 AM..
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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)