Bad performance Openvms

[geir_2]

Hi,

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

[Robert Gezelter]

Geir,

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

[Wim Van den Wyngaert]

Rather old but try http://starlet.deltatelecom.ru/~laishev/perf-cookbook.txt

Wim

[Ian Miller.]

What are you measuring to know the system performance is decreasing? User reports or actual figures of reduced application thoughput?

Do you have records of performance data (e.g from MONITOR) which cold be compared?

[Karl Rohwedder]

Geir,

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

[geir_2]

Hello,

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

[Antoniov.]

Hi Geir,
Do your application running using RMS files? May be internal structure is degraded.

Antonio Vigliotti

[Jan van den Ende]

Geir,

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

[labadie_1]

what applications run on your system ? database, rms files ?

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...

[Andy Bustamante]

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