System Paging, a problem ? (128 Views)
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Occasional Contributor
rapidwiz
Posts: 5
Registered: ‎01-08-2013
Message 1 of 5 (128 Views)

System Paging, a problem ?

Hi All,

 

We running 11.31 and we have Progress DB on the system. The system pages between 12-2am and looks ok during the day. No paging seems to occur during the day.

 

Is this a concern ? We haven't gone live, so I can't tell you if we have a system impact, but we don't want to live and find out we have issues.

 

I see this consistently every night, swap space is fine, does not go over 50% used, memory is between 80-100%. I changed filecache_max to 5% and memory has dropped to around 85%, but the system still seems to be paging ?

 

Is this an issue or not ?

 

 

 

Wed Jan 16 00:35:04 PST 2013
         procs           memory                   page                              faults       cpu
    r     b     w      avm    free   re   at    pi   po    fr   de    sr     in     sy    cs  us sy id
    4     1     0  5974642  4998666    0    0    12   37     0    0     8   3752  14390  1551   1  2 96
    4     1     0  5974642  5259870    0    0    23 7284     0    0     0   7654 162425  5252  14 19 68
    4     1     0  5974642  5259264    0    0    17 7398     0    0     0   7727 168368  5122  13 16 71
    3     1     0  6033307  5257595    0    0    12 7673     0    0     0   8133 174293  5428   9 16 75
    3     1     0  6033307  5034440    0    0     8 7248     0    0     0   7753 168713  5057   8 22 69
    3     1     0  6033307  5259117    0    0     6 7760     0    0     0   7725 170493  5278   9 17 74
    3     1     0  6033307  5161130    0    0     7 6274     0    0     0   8880 164315  7323   8 22 70
    3     1     0  6033307  4996830    0    0     5 4728     0    0     0   9511 156201  8983   9 16 74
    3     1     0  5980719  5271466    0    0     4 3760     0    0     0  10200 153298 10422  12 15 73
    3     1     0  5980719  5271722    0    0     3 5089     0    0     0  10470 147381  9493   3 11 86
    3     1     0  5980719  5269716    0    0   104 6819     0    0     0  10053 150452  8042   2 14 84
    3     1     0  5980719  5272659    0    0    68 6803     0    0     0   9072 157548  6869   5 16 79
    3     1     0  5980719  5271955    0    0    65 7052     0    0     0   9023 155839  6106   2 13 85
    2     1     0  5987790  5271226    0    0    42 8216     0    0     0   8322 157545  5116   2 14 84
    2     1     0  5987790  5271077    0    0    26 8216     0    0     0   8352 155130  4928   1 13 86
    2     1     0  5987790  5270697    0    0    16 10148     0    0     0   8115 154463  4594   2 22 76
    2     1     0  5987790  5270660    0    0    10 9663     0    0     0   8732 151327  4868   2 16 82
    2     1     0  5987790  5271116    0    0     6 9491     0    0     0   8182 153453  4453   2 14 84
    2     1     0  5976602  5271503    0    0     8 8650     0    0     0   8932 148606  5173   2 14 85
    2     1     0  5976602  5272298    0    0     4 6323     0    0     0   9557 143510  7442   2 11 87

 

Please see attached.

 

 

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Honored Contributor
Patrick Wallek
Posts: 13,711
Registered: ‎06-21-2000
Message 2 of 5 (108 Views)

Re: System Paging, a problem ?

You need to try to determine what exactly is going on during the time you see the paging activity.

 

A script set up in cron to run 'ps -ef' several times during the paging would be a start so you can at least see the processes that are running.

 

Even better may be something like the following:

 

ps -e -o user,pid,ppid,sz,vsz,args

 

The sz and vsz will give you some memory information on each process.

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Occasional Contributor
rapidwiz
Posts: 5
Registered: ‎01-08-2013
Message 3 of 5 (103 Views)

Re: System Paging, a problem ?

Thanks Patrick,

 

This is when backups are running, is this normal ?

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Honored Contributor
Patrick Wallek
Posts: 13,711
Registered: ‎06-21-2000
Message 4 of 5 (101 Views)

Re: System Paging, a problem ?

I don't think that is normal. 

 

I used to manage a server running a Progress DB and I don't recall ever seeing paging activity like that during our backup window.

 

If you have any application / database consultants helping with you implementation you should run this past them.  

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Honored Contributor
Patrick Wallek
Posts: 13,711
Registered: ‎06-21-2000
Message 5 of 5 (97 Views)

Re: System Paging, a problem ?

While talking with a coworker about a similar problem with one of our customers, he mentioned that the problem could be memory mapped files.  

 

You might check with the Progress folks and see if they are using memory mapped files during the backups.

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