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тАО12-16-2008 02:02 AM
тАО12-16-2008 02:02 AM
1. The same process apparently using less CPU in consecutive intervals, e.g. at 10:00 CPU=6957 at 10:15 CPU=4173, at 10:30 CPU=7132. We thought the CPU used values would be "gas meters", i.e. they only get bigger until the process ends. Calculating the CPU time used during an interval by a process results in negative values - and that can't be right.
2. Process IDs are duplicated - that seems odd too. I would have thought that every process in a given system would have a unique PID. We see that a process also has a start date/time and have used that provide a unique key, but even so, processes that we know are running don't appear to be present in every interval in the data we get back from GET$JPI.
Any ideas or pointers as to what is going on would be gratefully received.
Solved! Go to Solution.
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тАО12-16-2008 03:04 AM
тАО12-16-2008 03:04 AM
Re: Process information from GET$JPI seems inconsistent
first of all, welcome to the HP OpenVMS Forum.
Your problem sounds very strange.
PID's are absolutely unique within same cluster.
Also the problem you have with getjpi sounds impossible for me.
Could you supply some example code? Until now I can only assume a coding problem.
Regards
Geni
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тАО12-16-2008 03:17 AM
тАО12-16-2008 03:17 AM
Re: Process information from GET$JPI seems inconsistent
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тАО12-16-2008 03:18 AM
тАО12-16-2008 03:18 AM
Re: Process information from GET$JPI seems inconsistent
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тАО12-16-2008 03:18 AM
тАО12-16-2008 03:18 AM
Re: Process information from GET$JPI seems inconsistent
welcome to the OpenVMS ITRC forum.
1. the used CPU time in a process is stored in the process header (PHD$L_CPUTIM) in 10 ms units and can only increment during the life of a process. You can look at the data in memory with:
$ ANAL/SYS
SDA> READ SYSDEF
SDA> SET PROC/IND=
SDA> EXA PHD+PHD$L_CPUTIM
SDA> EXIT
2. Process IDs are guaranteed to be unique within a system and even within a cluster. The fact that you don't get all the process data in each interval, may be caused by issues with the state of the process being queried, as some of the GETJPI calls may need to run in the context of that process and the state of that process may prevent such code to be executed immediately.
Volker.
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тАО12-16-2008 03:43 AM
тАО12-16-2008 03:43 AM
Re: Process information from GET$JPI seems inconsistent
for me it seems that this is basic code.
I dont have a basic compiler and I did not use basic the last 25 years.
That means that I can't help you.
But you can search some example code on google. Do a search for + openvms +basic + lib$getjpi and you will find a solution for your problem
Sorry for no better help
Regards
Geni
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тАО12-16-2008 03:48 AM
тАО12-16-2008 03:48 AM
Re: Process information from GET$JPI seems inconsistent
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тАО12-16-2008 03:59 AM
тАО12-16-2008 03:59 AM
Re: Process information from GET$JPI seems inconsistent
So, use sys$getjpiw and check the both the return status AND the status in the iosb.
Jur.
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тАО12-16-2008 04:02 AM
тАО12-16-2008 04:02 AM
Re: Process information from GET$JPI seems inconsistent
did you check, wheter a real process exists in the monitored system with a PID of 00153AB8 ? I bet this is some P0 space address in your program and not a real PID ! Just use $ SHOW SYSTEM, it will show you a list of the processes including their PID in column 1.
And note that the 3 different ISEE$MAD processes have only increasing values in their CPUTIM fields...
Volker.
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тАО12-16-2008 04:09 AM
тАО12-16-2008 04:09 AM
Re: Process information from GET$JPI seems inconsistent
without digging deeper into the code (and installing a BASIC compiler) a few things come to mind when looking at your code:
- where do you construct the item list passed to $GETJPI?
- IOSB seems to be undefined/uninitialized
- you are using the asynchronous version of $GETJPI, but don't synchronize with an event flag and/or check the IOSB. You'd better use $GETJPIW in this case (unless you want to issue multiple calls in parallel - in which case I'm not sure how scanning the process list would work out).
This should give you a start to improve the code you posted. If more problems show up, get back here.
Good luck & regards,
Hans.