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Top Forums UNIX for Dummies Questions & Answers Pls. help with vmstat output... Post 302880785 by samnyc on Monday 23rd of December 2013 11:34:30 AM
Old 12-23-2013
Pls. help with vmstat output...

Hi,

Users are reporting performance issue on my Sun Solaris 10 server. I am on the server. I don't see a issue or I might be looking at the wrong thing. Please help.

I don't see anything on sar. it's all zero on that. Not sure why users are reporting high CPU and unresponsive at times. Please advise.

Code:
 
 
bash-3.00# vmstat 5 10
 kthr      memory            page            disk          faults      cpu
 r b w   swap  free  re  mf pi po fr de sr s1 s2 s3 s4   in   sy   cs us sy id
 0 0 0 20506808 4478936 14 42 3 0  0  0  0 80  0 -0 25  576 5189 1193  2  2 96
 0 0 0 15647368 547008 2  4  2  0  0  0  0  0  0  0 28  457  926  612  0  1 99
 0 0 0 15647368 547064 0  0  0  0  0  0  0  0  0  0 27  362 1023  588  0  1 99
 0 0 0 15647368 547064 14 55 0  0  0  0  0  0  0  0 43  395 1450  793  0  1 99
 0 0 0 15646288 546128 223 331 6 2 2  0  0  0  0  0 31  375 2598  800  2  2 95
 0 0 0 15647336 547024 0  0  0  0  0  0  0  0  0  0 34  373  921  621  0  1 99
 0 0 0 15647296 546984 0  0  0  0  0  0  0  0  0  0 26  370 1735  615  1  1 98
 0 0 0 15647296 546984 0  0  0  0  0  0  0  0  0  0 29  611 2301  650  1  1 98
 0 0 0 15647168 546856 0  0  0  0  0  0  0  0  0  0 27  595  807  570  0  1 99
 0 0 0 15646896 546584 5 35  0  0  0  0  0  0  0  0 30  615 1287  679  0  1 99

Code:
bash-3.00# swap -s
total: 6042408k bytes allocated + 74784k reserved = 6117192k used, 15714592k available

Code:
bash-3.00# vmstat -s
        0 swap ins
        0 swap outs
        0 pages swapped in
        0 pages swapped out
278719283 total address trans. faults taken
  1550955 page ins
    47604 page outs
  2563835 pages paged in
    83755 pages paged out
 95569406 total reclaims
 95554145 reclaims from free list
        0 micro (hat) faults
278719283 minor (as) faults
  1400663 major faults
366825812 copy-on-write faults
 56843033 zero fill page faults
    61436 pages examined by the clock daemon
        0 revolutions of the clock hand
    68470 pages freed by the clock daemon
  1225565 forks
   266840 vforks
  1265895 execs
7944256901 cpu context switches
3833984919 device interrupts
493857253 traps
34555934259 system calls
3694815074 total name lookups (cache hits 95%)
 56576969 user   cpu
 52216516 system cpu
2555164048 idle   cpu
        0 wait   cpu


 
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VMSTAT(1)						      General Commands Manual							 VMSTAT(1)

NAME
vmstat - report virtual memory statistics SYNOPSIS
vmstat [ -fsi ] [ drives ] [ interval [ count ] ] DESCRIPTION
Vmstat delves into the system and normally reports certain statistics kept about process, virtual memory, disk, trap and cpu activity. If given a -f argument, it instead reports on the number of forks and vforks since system startup and the number of pages of virtual memory involved in each kind of fork. If given a -s argument, it instead prints the contents of the sum structure, giving the total number of several kinds of paging related events which have occurred since boot. If given a -i argument, it instead reports on the number of inter- rupts taken by each device since system startup. If none of these options are given, vmstat will report in the first line a summary of the virtual memory activity since the system has been booted. If interval is specified, then successive lines are summaries over the last interval seconds. ``vmstat 5'' will print what the system is doing every five seconds; this is a good choice of printing interval since this is how often some of the statistics are sampled in the system; others vary every second, running the output for a while will make it apparent which are recomputed every second. If a count is given, the statistics are repeated count times. The format fields are: Procs: information about numbers of processes in various states. r in run queue b blocked for resources (i/o, paging, etc.) w runnable or short sleeper (< 20 secs) but swapped Memory: information about the usage of virtual and real memory. Virtual pages are considered active if they belong to processes which are running or have run in the last 20 seconds. A ``page'' here is 1024 bytes. avm active virtual pages fre size of the free list Page: information about page faults and paging activity. These are averaged each five seconds, and given in units per second. re page reclaims (simulating reference bits) at pages attached (found in free list) pi pages paged in po pages paged out fr pages freed per second de anticipated short term memory shortfall sr pages scanned by clock algorithm, per-second up/hp/rk/ra: Disk operations per second (this field is system dependent). Typically paging will be split across several of the available drives. The number under each of these is the unit number. Faults: trap/interrupt rate averages per second over last 5 seconds. in (non clock) device interrupts per second sy system calls per second cs cpu context switch rate (switches/sec) Cpu: breakdown of percentage usage of CPU time us user time for normal and low priority processes sy system time id cpu idle If more than 4 disk drives are configured in the system, vmstat displays only the first 4 drives, with priority given to Massbus disk drives (i.e. if both Unibus and Massbus drives are present and the total number of drives exceeds 4, then some number of Unibus drives will not be displayed in favor of the Massbus drives). To force vmstat to display specific drives, their names may be supplied on the command line. FILES
/dev/kmem, /vmunix SEE ALSO
systat(1), iostat(1) The sections starting with ``Interpreting system activity'' in Installing and Operating 4.2bsd. 4th Berkeley Distribution March 15, 1986 VMSTAT(1)

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