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type of pages being paged in/out


 
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Operating Systems AIX type of pages being paged in/out
# 1  
Old 03-01-2011
type of pages being paged in/out

Hello people

i see that our system is paging and paging space usage grows, a the same time i see that usage of Comp memory grows and Client memory decreases.

Code:
# lsps -s
Total Paging Space   Percent Used
      65792MB              33%

MEMORY
Real,MB   81920
% Comp     69
% Noncomp  30
% Client   30

Can i assume that once balance changes in Comp and Noncomp memory usage, and paging space increases as well it means that Client(Noncomp) pages were paged out to paging space?

The main question is: How to identify what type of pages (Computational or Client) were paged out or paged in? Where can i see such statistiscs in AIX?

Thank you for the responses.

Last edited by pludi; 03-01-2011 at 09:11 AM..
# 2  
Old 03-01-2011
Overview of AIX page replacement covers monitoring, perhaps you can compare totals in real time to see what sort of activity is happening, if there is no ready built tool.
# 3  
Old 03-01-2011
there are values of computational and non-computational memory in svmon output, but it shows only what is in real memory, and not what is in paging space...
i'm more interested in the page out rate of computational and non-computational pages.

if i see that Non-comp memory decreased, then it was paged out to a file system and not to to a paging space itself, if i'm not mistaken, but this is still a page out activity. then why paging space usage is growing? is it filled with computational pages only?
# 4  
Old 03-01-2011
Can we assume this is an untuned box running AIX 5.3 ? If so set lru_file_repage to 0 and the paging will dramatically decrease. There are a bunch of threads here on what else you can do ... if your box is properly tuned, than most likely you are paging non-comp but to me it doesn't look like.

Regards
zxmaus
# 5  
Old 03-02-2011
it's AIX 6.1 lru_file_repage is set to 0, minperm% = 5, maxperm% =95. maxlcient% = 95

so it's instructed to page out only non-computational pages.

IBM suggested to increase minfree and maxfree settings to be lrud more active in freeing pages.
# 6  
Old 03-02-2011
zoom,

can you show us your vmstat -Iwt 2 10 output from a real busy time of your system ?

Your box should not page at all as far as I can see - it rather should scan and free pages when your free list is very small. I had a similar problem just a few weeks ago with one of my AIX 6.1 boxes (and IBM could not see any problem at first). Like you I had about 25 GB memory non-comp memory what is for most systems more than sufficient - but my box was scanning and freeing itself to death. Being escalated to 3rd level because I insisted of having a problem, they provided me an efix that solved this problem immediately and permanently as this strange 'paging even though there is sufficient memory + scanning / freeing excessively' is a known bug. So my question would be how high is your scan to free ratio right now ?

Maybe it is similar on your box? They gave me PTF U837435

Regards
zxmaus
# 7  
Old 03-03-2011
we have 80Gb of real memory. if i did not mention, we have Oracle DB on the system, and as i know usually it's hungry for computational memory.

i have saved vmstat output from 2 days ago, when system was paging, but without I flag.

any suggestions on the stats below?

Code:
# vmstat -wt 1 50

System configuration: lcpu=12 mem=81920MB ent=4.15

 kthr   memory                 page                       faults                 cpu             time
-------  ------------------------------------ ------------------ ----------------------- --------
  r   b        avm        fre    re    pi    po    fr     sr    cy    in     sy    cs us sy id wa    pc    ec hr mi se
 50  32   19586241      10654     0   899     0 30407  42956     0 12452  84930 24211 86 14  0  0  5.99 144.3 13:56:42
 57  24   19574642      11469     0   395     0 18630  25800     0 10805  87318 20980 87 13  0  0  5.99 144.4 13:56:43
  0   0   19573830      11694     0   323     0 22416  72915     1  9943  81807 23153 87 13  0  0  6.00 144.5 13:56:44
 55  31   19580318      10492     0   890     0 29191  41214     0 10861 103327 21363 87 13  0  0  5.98 144.1 13:56:45
 53  22   19589125       9669     0   493  3472 32245  51115     0 11359  85225 21000 87 13  0  0  5.94 143.1 13:56:46
 39  45   19579715      10950     0   585  4776  8347  83604     0  8291  96653 13998 90 10  0  0  6.01 144.8 13:56:47
 43  34   19576204      11290     0  1059     0 22258  61472     0 11956 161918 20279 86 14  0  0  5.99 144.4 13:56:48
 55  23   19582398      10613     0  1224     0 30898  40402     0 12282 108149 19988 85 15  0  0  5.99 144.3 13:56:49
 43  39   19596937       9665     0   525  6646 31487  70471     0  8198 116227 15955 86 14  0  0  5.99 144.2 13:56:50
 56  36   19602851      11116     0   547  9091 21804  92776     0  8565 122928 14486 87 13  0  0  5.99 144.4 13:56:51
 55  33   19612355      11776     0  1205  2401 32602  67571     0  9969 101132 19536 87 13  0  0  5.99 144.4 13:56:52
 59  27   19612958       9951     0  1342  3391 23245  28008     0 11897 120336 22279 87 13  0  0  6.01 144.7 13:56:53
 64  19   19612442      11375     0   632  8739 23997  54422     0 12854 126162 23925 84 16  0  0  5.99 144.3 13:56:54
 53  35   19628881      10715     0   901  6874 24036 117416     0  6716 115341 15583 86 14  0  0  5.98 144.0 13:56:55
  0   0   19617723      15333     0  1039   214  7497   7527     0  7946 332319 71947 90 10  0  0  6.01 144.8 13:56:56
100  16   19628065      10639     0   963     0 32977  39197     0 10642 317848 123714 79 21  0  0  6.00 144.5 13:56:57
  0   0   19604326      27589     0  1016  2942 14517  17680     0  9357 119917 16855 60 40  0  0  6.01 144.7 13:56:58
 59  46   19601496      11339     0   976     0  6554  26965     0 11104 129211 20731 87 13  0  0  6.00 144.5 13:56:59
 65  31   19600216      10691     0   845     0 21576  64180     1 11287 106020 21053 87 13  0  0  5.97 144.0 13:57:00
 67  21   19599421      10664     0  1439     0 28527  35218     0 12221  91819 22345 86 14  0  0  5.96 143.6 13:57:01
 kthr   memory                 page                       faults                 cpu             time
-------  ------------------------------------ ------------------ ----------------------- --------
  r   b        avm        fre    re    pi    po    fr     sr    cy    in     sy    cs us sy id wa    pc    ec hr mi se
 58  21   19599235      10927     0   968     0 22100  22986     0 10640 154316 19789 87 13  0  0  5.99 144.4 13:57:02
 60  17   19612455      10859     0  1352     0 31795  73250     0  9676 105401 20180 86 14  0  0  5.94 143.1 13:57:03
 67  18   19597492      13340     0  1467  1576  8890  28669     1 11034  98093 17871 88 12  0  0  5.98 144.1 13:57:04
 54  23   19601329      10550     0   746     0 21498  23955     0 10921 107948 19137 88 12  0  0  5.99 144.3 13:57:05
 66  27   19589092      12604     0   921     0  8567  10177     0 10294 127234 17988 89 11  0  0  5.99 144.4 13:57:06
 55  19   19590418      12040     0  1471     0 21869  22702     0 10084  93156 17766 90 10  0  0  5.99 144.3 13:57:07
 61  17   19589893      10505     0   518     0 19931  69584     0  8191 115953 22017 89 11  0  0  6.00 144.5 13:57:08
 66  23   19581600      12367     0   372     0 14610  27604     1  8092 133452 35738 89 11  0  0  5.99 144.4 13:57:09
  0   0   19576270      14603     0   357     0 24366  28005     0  8279  92462 17792 89 11  0  0  6.00 144.5 13:57:10
 53  21   19574321      10916     0   245     0 11368  11616     0  8170  98819 14636 91  9  0  0  5.99 144.4 13:57:11
 79  87   19580973      10435     0   155     0 24973  43934     0  7599  80480 19025 90 10  0  0  5.99 144.3 13:57:12
 56  30   19585494      10905     0   902     0 26829 103304     1 10790  98629 24273 86 14  0  0  6.00 144.5 13:57:13
 56  23   19589050      10514     0   486     0 22266  55616     0  9210 105709 20334 89 11  0  0  5.99 144.4 13:57:14
 50 101   19587932      12694     0   353     0 23691  52835     0  9576  91472 22026 88 12  0  0  5.98 144.1 13:57:15
 52  32   19592414      11794     0  1049  4005 24242  83626     0 10101 101352 18770 88 12  0  0  6.00 144.5 13:57:16
 59  16   19607402      10611     0  1636  1455 35453  71842     1 11907  93990 21436 86 14  0  0  6.00 144.6 13:57:17
 54  19   19601814      11293     0  1644     0 16944  17551     0 10624 107926 21901 88 12  0  0  5.99 144.4 13:57:18
 55  22   19617178       9763     0   527  6028 38959  52664     0 12361 163764 30047 85 15  0  0  6.02 144.9 13:57:19
 59  20   19624308      12069     0  1059 11011 29785  58740     0  9919 121105 20893 85 15  0  0  5.96 143.7 13:57:20
 61  15   19606622      10739     0  1999     0 13636  40117     1 10881 157683 20670 86 14  0  0  6.00 144.6 13:57:21
 kthr   memory                 page                       faults                 cpu             time
-------  ------------------------------------ ------------------ ----------------------- --------
  r   b        avm        fre    re    pi    po    fr     sr    cy    in     sy    cs us sy id wa    pc    ec hr mi se
 50  20   19614515      13718     0   963     0 35873  36624     0 11771 138131 20688 84 16  0  0  5.99 144.3 13:57:22
 50  19   19611292      11685     0  1044     0 16801  17505     0 11865 101876 19603 89 11  0  0  5.98 144.2 13:57:23
 64  19   19608099      10734     0  1499     0 22949  68062     0 10512  93798 19521 87 13  0  0  6.00 144.6 13:57:24
  0   0   19618775      10522     0  1399     0 32650  37033     1 10516 105945 21526 85 15  0  0  5.99 144.3 13:57:25
 53  17   19610636      14427     0  1152     0 15200  15761     0  8560 116186 16393 86 14  0  0  6.00 144.6 13:57:26
 54  19   19613128      11520     0   959  1892 12575  14683     0  7575  76820 12665 91  9  0  0  5.99 144.4 13:57:27
 49  16   19620876      11118     0   482  7708 26408  72068     0 10772 163651 19375 82 18  0  0  6.00 144.5 13:57:28
 54  19   19611742      13191     0   831   141 15885  21959     1 10009 125374 16798 83 17  0  0  5.98 144.1 13:57:29
 53  13   19604376      13235     0   748     0 15730  24210     0  8667 100917 16720 83 17  0  0  6.00 144.7 13:57:30
 51  19   19596551      14312     0   613     0 12341  12694     0  9243  98722 15107 86 14  0  0  5.98 144.1 13:57:31

Code:
# svmon -G
               size       inuse        free         pin     virtual   mmode
memory     20971520    20895377       10607     4564324    19496715     Ded
pg space   16842752     5667782

               work        pers        clnt       other
pin         3952074           0           0      612250
in use     14447994           5     6447378

PageSize   PoolSize       inuse        pgsp         pin     virtual
s    4 KB         -    10584481     5480166      811284     9154139
m   64 KB         -      644431       11726      234565      646411

Code:
# vmstat -v
             20971520 memory pages
             20286310 lruable pages
                10525 free pages
                    4 memory pools
              4631080 pinned pages
                 80.0 maxpin percentage
                  5.0 minperm percentage
                 95.0 maxperm percentage
                 31.3 numperm percentage
              6357498 file pages
                  0.0 compressed percentage
                    0 compressed pages
                 31.3 numclient percentage
                 95.0 maxclient percentage
              6357493 client pages
                    0 remote pageouts scheduled
              1167074 pending disk I/Os blocked with no pbuf
               600159 paging space I/Os blocked with no psbuf
                 2484 filesystem I/Os blocked with no fsbuf
                  443 client filesystem I/Os blocked with no fsbuf
            249209795 external pager filesystem I/Os blocked with no fsbuf

Code:
# vmo -a
     ame_cpus_per_pool = 8
       ame_maxfree_mem = 0
   ame_min_ucpool_size = 0
       ame_minfree_mem = 0
       ams_loan_policy = n/a
   force_relalias_lite = 0
     kernel_heap_psize = 65536
          lgpg_regions = 0
             lgpg_size = 0
       low_ps_handling = 1
               maxfree = 1088
               maxperm = 19271992
                maxpin = 16912783
               maxpin% = 80
         memory_frames = 20971520
         memplace_data = 2
  memplace_mapped_file = 2
memplace_shm_anonymous = 2
    memplace_shm_named = 2
        memplace_stack = 2
         memplace_text = 2
memplace_unmapped_file = 2
               minfree = 960
               minperm = 1014314
              minperm% = 5
             nokilluid = 0
               npskill = 131584
               npswarn = 526336
             numpsblks = 16842752
       pinnable_frames = 16306688
   relalias_percentage = 0
                 scrub = 0
              v_pinshm = 0
      vmm_default_pspa = 0
    wlm_memlimit_nonpg = 1

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