Can someone explain me in plain english this vmstat output?

Can someone explain me in plain english this vmstat output?

Post by webs.. » Wed, 23 Dec 1998 04:00:00



I can understand what each of the parameters mean in the output below,
but what I would like to know is what it means when there is lot of page
I/O going on combined with heavy disk usage?

The OS is Sun Solaris 2.5.1, and the sampling rate is once every 2 secs.

Thanks
Kris--

procs     memory            page            disk          faults    
cpu
 r b w   swap  free  re  mf pi po fr de sr f0 s0 s6 --   in   sy   cs us
sy id
 0 0 0 165992  5616   2  99 177 153 214 0 98 0 34 0  0  334 9216  292
59  6 35
 0 2 0 100776  2192   2  69 508 428 620 0 238 0 109 0 0 606 16255 335
38  8 54
 0 2 0 100640  2000   0 112 492 388 548 0 158 0 105 0 0 610 16308 327
37  7 56
 0 1 0 100776  2056   5 113 496 416 428 0 8 0 110 0  0  619 14040 343 42
10 48
 0 1 0 100648  1984   9  75 488 380 576 0 227 0 106 0 0 611 16273 344
44  5 52
 0 1 0 100648  1912   7 118 504 452 644 0 268 0 104 0 0 589 16277 326
31  8 60
 0 1 0 100784  1960   5  74 544 308 468 0 243 0 101 0 0 580 16684 351
34  9 56
 0 1 0 100648  2000   5 120 524 356 548 0 162 0 103 0 0 588 15893 339
40  8 52
 0 1 0 100648  1944   5 108 432 312 600 0 238 0 101 0 0 593 16740 325
30  7 62
 0 1 0 100784  2032   4  67 504 396 416 0 19 0 108 0 0  629 16677 352
36  9 54
 1 0 0 100648  2040   4 164 516 372 592 0 176 0 107 0 0 598 15981 338
32  8 60
 0 1 0 100656  1944   2 118 536 332 636 0 225 0 106 0 0 624 15857 360 34
10 56
 1 1 0 100600  2008   4 398 480 376 436 0 48 0 104 0 0  559 16252 323 45
16 39
 0 2 0 100648  2016   3 117 516 364 516 0 71 0 105 0 0  564 15946 299
31  9 60
 0 2 0 100208  1760   5 175 524 332 1100 0 422 0 102 0 0 573 16282 340
38 10 52
 0 1 0  99344  2040   5  94 464 400 668 0 155 0 104 0 0 580 15839 333
53  6 40
 0 1 0  99208  2104   3 112 480 420 616 0 132 0 104 0 0 581 15868 316
60  7 32
 1 1 0  99208  2024   2 114 504 404 544 0 111 0 108 0 0 595 16774 335
46  3 52
 0 2 0  99344  2104   3  62 468 384 396 0 6 0 100 0  0  568 14856 308 66
10 24
 procs     memory            page            disk          faults    
cpu
 r b w   swap  free  re  mf pi po fr de sr f0 s0 s6 --   in   sy   cs us
sy id
 0 2 0  99208  1936   6 115 480 344 580 0 202 0 97 0 0  554 16806 329
66  6 28
 0 3 0  99208  1752   8 167 512 312 600 0 258 0 99 0 0  550 15993 321
30  8 62
 0 3 0  99344  2152   5  65 528 432 500 0 65 0 103 0 0  579 16683 300
24  6 70
 0 2 0  99208  1936   5 118 512 384 624 0 248 0 109 0 0 583 14984 327 41
10 50
 0 3 0  99344  1968   5  68 544 416 456 0 47 0 106 0 0  600 16738 322
28  7 65
 0 2 0  99208  2016   8 127 580 464 696 0 230 0 115 0 0 627 14979 338
32  8 59
 0 2 0  99208  2008   6 106 412 408 596 0 149 0 107 0 0 590 15655 315 42
11 47

 
 
 

Can someone explain me in plain english this vmstat output?

Post by Richard Smit » Thu, 24 Dec 1998 04:00:00


The "plain english" may be a tough one, but here goes:

pi=page in      done all the time by virtual memory system (normal activity) whenever
                   an executable is started, data files opened...
po=page out     done to move pages out of real memory to disk (swap area)  this too
                   is normal in moderation, but when it is constant, is a yellow flag.
sr=scan rate    does "bailing water" ring a bell?  system needs to bring something
                   into RAM, but must flush something out to swap to make room.
                   Many say that values higher than 200 mean trouble.
de              any non-zero value is considered a desparate attempt to reclaim
                   pages of RAM for urgent needs.  does "Titanic" sound familiar?

I would guess your system is in need of a RAM upgrade by the looks of "sr".


> I can understand what each of the parameters mean in the output below,
> but what I would like to know is what it means when there is lot of page
> I/O going on combined with heavy disk usage?

> The OS is Sun Solaris 2.5.1, and the sampling rate is once every 2 secs.

> Thanks
> Kris--

> procs     memory            page            disk          faults
> cpu
>  r b w   swap  free  re  mf pi po fr de sr f0 s0 s6 --   in   sy   cs us
> sy id
>  0 0 0 165992  5616   2  99 177 153 214 0 98 0 34 0  0  334 9216  292
> 59  6 35
>  0 2 0 100776  2192   2  69 508 428 620 0 238 0 109 0 0 606 16255 335
> 38  8 54
>  0 2 0 100640  2000   0 112 492 388 548 0 158 0 105 0 0 610 16308 327
> 37  7 56
>  0 1 0 100776  2056   5 113 496 416 428 0 8 0 110 0  0  619 14040 343 42
> 10 48
>  0 1 0 100648  1984   9  75 488 380 576 0 227 0 106 0 0 611 16273 344
> 44  5 52
>  0 1 0 100648  1912   7 118 504 452 644 0 268 0 104 0 0 589 16277 326
> 31  8 60
>  0 1 0 100784  1960   5  74 544 308 468 0 243 0 101 0 0 580 16684 351
> 34  9 56
>  0 1 0 100648  2000   5 120 524 356 548 0 162 0 103 0 0 588 15893 339
> 40  8 52
>  0 1 0 100648  1944   5 108 432 312 600 0 238 0 101 0 0 593 16740 325
> 30  7 62
>  0 1 0 100784  2032   4  67 504 396 416 0 19 0 108 0 0  629 16677 352
> 36  9 54
>  1 0 0 100648  2040   4 164 516 372 592 0 176 0 107 0 0 598 15981 338
> 32  8 60
>  0 1 0 100656  1944   2 118 536 332 636 0 225 0 106 0 0 624 15857 360 34
> 10 56
>  1 1 0 100600  2008   4 398 480 376 436 0 48 0 104 0 0  559 16252 323 45
> 16 39
>  0 2 0 100648  2016   3 117 516 364 516 0 71 0 105 0 0  564 15946 299
> 31  9 60
>  0 2 0 100208  1760   5 175 524 332 1100 0 422 0 102 0 0 573 16282 340
> 38 10 52
>  0 1 0  99344  2040   5  94 464 400 668 0 155 0 104 0 0 580 15839 333
> 53  6 40
>  0 1 0  99208  2104   3 112 480 420 616 0 132 0 104 0 0 581 15868 316
> 60  7 32
>  1 1 0  99208  2024   2 114 504 404 544 0 111 0 108 0 0 595 16774 335
> 46  3 52
>  0 2 0  99344  2104   3  62 468 384 396 0 6 0 100 0  0  568 14856 308 66
> 10 24
>  procs     memory            page            disk          faults
> cpu
>  r b w   swap  free  re  mf pi po fr de sr f0 s0 s6 --   in   sy   cs us
> sy id
>  0 2 0  99208  1936   6 115 480 344 580 0 202 0 97 0 0  554 16806 329
> 66  6 28
>  0 3 0  99208  1752   8 167 512 312 600 0 258 0 99 0 0  550 15993 321
> 30  8 62
>  0 3 0  99344  2152   5  65 528 432 500 0 65 0 103 0 0  579 16683 300
> 24  6 70
>  0 2 0  99208  1936   5 118 512 384 624 0 248 0 109 0 0 583 14984 327 41
> 10 50
>  0 3 0  99344  1968   5  68 544 416 456 0 47 0 106 0 0  600 16738 322
> 28  7 65
>  0 2 0  99208  2016   8 127 580 464 696 0 230 0 115 0 0 627 14979 338
> 32  8 59
>  0 2 0  99208  2008   6 106 412 408 596 0 149 0 107 0 0 590 15655 315 42
> 11 47

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