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06-26-2005 07:33 PM
06-26-2005 07:33 PM
The system performance is decreasing the last month.
The show process command list all process on the system with belonging state and priority.
Is there some special state or columns that i must be aware on? Other suggestions?
The system have one CPU, no NFS.
Rgds Geir
Solved! Go to Solution.
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06-26-2005 08:30 PM
06-26-2005 08:30 PM
Re: Bad performance Openvms
Many things can cause performance problems that appear to steadily get worse. The problems can range from poorly designed applications to steadily worsening hardware problems.
The SHOW SYSTEM command will show you the process states and the priorities, but that will not necessarily lead you to a result. That report is based upon the exact instant in time that the command is processed. MONITOR PROCESS/TOPCPU would be more helpful in identifying if there is a process consuming all available CPU time.
However, as I mentioned earlier, that is but one of the possible underlying causes of decreasing performance. There are many others.
Do you have some additonal information about the system workload?
- Bob Gezelter, http://www.rlgsc.com
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06-26-2005 08:35 PM
06-26-2005 08:35 PM
Re: Bad performance Openvms
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06-26-2005 08:36 PM
06-26-2005 08:36 PM
Re: Bad performance Openvms
Do you have records of performance data (e.g from MONITOR) which cold be compared?
Purely Personal Opinion
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06-26-2005 08:39 PM
06-26-2005 08:39 PM
Re: Bad performance Openvms
1st question: has something changed, e.g.
number of users, new version of software (system or application), hardware, network,...?
2nd: has something gone bad, e.g. memory, disk?
Check Errorlog, SHOW MEMORY, MONITOR *.
SHOW SYSTEM -> processes with xxxO (outswapped, e.g. COMO)
Do you have hard data for the performance degradation or is this more a feeling/user complaint?
regards Kalle
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06-26-2005 09:07 PM
06-26-2005 09:07 PM
Re: Bad performance Openvms
Everyting seems to be normal:
1) Normal traffic on the network according to cisco router
2) No swapped out process
3) 15 interactive users logged in on the system
4) According to monitor process/topcpu
no process have more than 20% CPU. Is there other commands that show the workload on system?
5) The performance is degraded, I have not installed new software, users and hardware.
6) The system is running DECnet IV, TCP/IP and LAT
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06-26-2005 10:19 PM
06-26-2005 10:19 PM
Re: Bad performance Openvms
Do your application running using RMS files? May be internal structure is degraded.
Antonio Vigliotti
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06-26-2005 10:55 PM
06-26-2005 10:55 PM
Re: Bad performance Openvms
have you somehow passed the threshold of starting to use paging?
SHOW MEM/FILE should indicate the amount used, and with
MONI PAGE
you can get an indication of paging activity.
Depending on the answers, totally different things need further investigating.
Proost.
Have one on me.
jpe
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06-26-2005 11:37 PM
06-26-2005 11:37 PM
Re: Bad performance Openvms
Anyway, you should run a performance collector tool (monitor is on any Vms system, Ecp...), and you should then be able to say you have a Cpu saturated problem, or an I/O problem (disk, bus, file saturated), or a memory problem, or a lock problem...
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06-27-2005 12:57 AM
06-27-2005 12:57 AM
Re: Bad performance Openvms
The first question is what is the source of "system performance is decreasing"? What application and how are you measure system performance?
You have a few system replies so far, in addtion has there been any network changes? You can check the Alpha NIC for errors with
$ mc lancp show dev /counter
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06-27-2005 08:14 AM
06-27-2005 08:14 AM
Re: Bad performance Openvms
What does $ MONITOR DISK/ITEM=QUEUE show?
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06-27-2005 08:29 AM
06-27-2005 08:29 AM
SolutionAs if you have not already received enough responses to your dilemma, I thought that I would add a few comments as well. You have already verified that no processes are in the "out-swapped" state, but you should also verify that there are no processes that are constantly/continuously in any sort of MWAIT/RWAIT state. This can be checked via the $mon stat
A few other commands for the "Monitor" utility may prove beneficial.
$mon clus
$mon rlock
$mon proc/topdio
$mon fcp
$mon proc/topbio
$mon time
I'm not sure that I saw what version of OVMS you are running, nor what platform, but a couple of these utilities were not implemented until v7.x Hope this helps..
Thanx,
whynot3k
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06-27-2005 09:41 AM
06-27-2005 09:41 AM
Re: Bad performance Openvms
You've had a lot of good suggestions to start working on. I thought I'd add one more possibility.
I had a system that was normally running great until suddenly, for no apparent reason, it became a real dog. i.e. 10-15 second response to a keyboard entry.
It turned out to be a workstation which was connected to the network with a bad cable (the connector was loose), so it kept connecting, loosing connection, reconnecting, etc.
This workstation was also setup to automatically log a user on, so each time it "connects", it would get a login prompt.
When you get a login prompt on VMS, you're are running loginout process and it runs at a very high priority so it will kill the system performance.
I found this when I issued a multiple
$) show user/node/fu
commands. This showed me that someone was connecting and trying to logon, then it would disappear, then re-appear, etc.
Since there was no actual login completed, I couldn't determine where it was coming from, so I got some assistance from the network boys using a sniffer.
Good luck,
Doug
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06-27-2005 12:15 PM
06-27-2005 12:15 PM
Re: Bad performance Openvms
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06-28-2005 12:35 PM
06-28-2005 12:35 PM
Re: Bad performance Openvms
The cookbook is great place to start
Watch mon system,
what do you see?
Does the cpu state grow?
What version of vms?
Does it gradually get slow?
Mon disk/item=q do any of your disks
(except when backup is running have a queue depth ON THE AVERAGE of more than 1),
Show mem? Do you have free memory?
Are you low on page file space?
Is it also slow on the console?
Are you logging errors?
Do an
Anal/system
sda>show mem/free
do you have support?
Do you reorganize index files?
Bob
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06-28-2005 10:37 PM
06-28-2005 10:37 PM
Re: Bad performance Openvms
Thanks to everyone for outstanding suggestions. I have tried all commands, but it was impossible to find the reason for performance degradation.
At end I rebooted the system, and now it seems to be faster than ever. If not, I will go through the suggeastions once more.
Thanks to everyone:-)
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06-28-2005 11:25 PM
06-28-2005 11:25 PM
Re: Bad performance Openvms
Purely Personal Opinion
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06-28-2005 11:43 PM
06-28-2005 11:43 PM
Re: Bad performance Openvms
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07-01-2005 09:54 PM
07-01-2005 09:54 PM
Re: Bad performance Openvms
set npage_gentle=100
set npage_aggresive=100
otherwise non page pool with fragment.
Make sure npagedyn hasn't grown
(show mem/full/pool)
and compare current versus initial value.
To see how fragmented npagedyn is
Analy/system
clue mem/free
There should only be a few free elements.
If you see thousands, that's a problem there.
Performance problems are rarely a single factor, but this one is a killer.
In 8.2 they set those parameters to 100 by default.
Bob
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07-03-2005 09:14 PM
07-03-2005 09:14 PM
Re: Bad performance Openvms
Purely Personal Opinion
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07-03-2005 09:27 PM
07-03-2005 09:27 PM
Re: Bad performance Openvms
it is NPAG_GENTLE and NPAG_AGGRESSIVE
regards Kalle
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07-04-2005 10:29 AM
07-04-2005 10:29 AM