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01-16-2013 09:03 PM
01-16-2013 09:03 PM
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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01-17-2013 06:09 AM
01-17-2013 06:09 AM
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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01-17-2013 06:20 AM
01-17-2013 06:20 AM
Re: System Paging, a problem ?
Thanks Patrick,
This is when backups are running, is this normal ?
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01-17-2013 06:41 AM
01-17-2013 06:41 AM
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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01-17-2013 08:28 AM
01-17-2013 08:28 AM
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.