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тАО03-01-2009 03:15 PM
тАО03-01-2009 03:15 PM
I need to explain why PIDs > 2170(hex) are occurring
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тАО03-01-2009 03:27 PM
тАО03-01-2009 03:27 PM
Re: I need to explain why PIDs > 2170(hex) are occurring
we're dealing with here? Care to reveal it?
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тАО03-01-2009 03:47 PM
тАО03-01-2009 03:47 PM
Re: I need to explain why PIDs > 2170(hex) are occurring
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тАО03-01-2009 03:48 PM
тАО03-01-2009 03:48 PM
Re: I need to explain why PIDs > 2170(hex) are occurring
OpenVMS Process IDs vary for all number of reasons. The only guarantee reported in the Internals and Data Structure manual is that the "high bit will never be set" [IDSM, Alpha 7.0, pp 225].
To be precise, SHOW SYSTEM displays the Extended PID [ibid]. The EPID is described in detail in the IDSM [ibid, pp 282, et seq.] and includes:
- the node sequence number (in clusters, 2 bits)
- the node index (clusters, 8 bits)
- the process sequence number (7-16 bits) and
- the process index (14-5 bits)
The boundary between the last two is sliding.
Presuming that there is any pattern to process ID assignments is generally a poor strategic choice. Even if a particular process appears to get the same process ID, there are no guarantees. Additionally, if a process is restarted for some reason (e.g., Queue Manager), the process number will change.
- Bob Gezelter, http://www.rlgsc.com
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тАО03-01-2009 04:03 PM
тАО03-01-2009 04:03 PM
Re: I need to explain why PIDs > 2170(hex) are occurring
That's a start. Version? Hardware?
Cluster? I assume not. Around here:
alp $ show process
1-MAR-2009 18:01:20.01 User: SMS Process ID: 2020048A
[...]
Why would you expect a limit of 10000 on a
process ID?
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тАО03-01-2009 04:19 PM
тАО03-01-2009 04:19 PM
Re: I need to explain why PIDs > 2170(hex) are occurring
Badly broken software might like it do but is has no business expecting that.
Maybe is wraps at Hex FFFF, but I don't really know (any more) and I don't care because no proper software should care.
A sign-off to stop checking PID ranges is well worth it.
Now BATCH job entry number (used to) recycle.
Maybe that's the problem?
fwiw,
Hein.
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тАО03-01-2009 05:31 PM
тАО03-01-2009 05:31 PM
Re: I need to explain why PIDs > 2170(hex) are occurring
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тАО03-02-2009 12:21 AM
тАО03-02-2009 12:21 AM
Re: I need to explain why PIDs > 2170(hex) are occurring
check Bob G's answer, 1st dash:
in a cluster it is even GUARANTEED to be (much) larger. PIDs are 8 char hex numbers, and in a cluster the first digit is always >= 2. Th e first 3 digits are the same for any process on a specific node in the cluster, and as long as the cluster is not completely dissolved, any new boot raises that 3-digit number by 2.
( I never found out what happens if THAT overflows, never got over 7xx )
hth
Proost.
Have one on me.
jpe
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тАО03-02-2009 01:14 AM
тАО03-02-2009 01:14 AM
Re: I need to explain why PIDs > 2170(hex) are occurring
As David Jones has observed in his post, it would be slightly better to check the PROC_INDEX, rather than the PID.
However, since the original post does not specify the context, I recommend extreme caution.
The OP did not mention if this is a real-time check on a running system, or a ex-post facto check against some log or accounting file.
If it is a check on (emphasis "ON") the current system, then some additional components can be checked (e.g., the Process Index against MAXPROCESSCNT). However, if this is not a check on the current system against a PID from the current running system, such a presumption would not be valid.
Depending on the internal structure of the PID is not, insofar as I know, a supported feature and should not be relied upon in any form. While it has been so for many years, there is no guarantee that it will not change in some way in the future. The only guarantee is that no two processes will have the same Process ID at the same time (in the same cluster).
- Bob Gezelter, http://www.rlgsc.com
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тАО03-02-2009 04:02 AM
тАО03-02-2009 04:02 AM
Re: I need to explain why PIDs > 2170(hex) are occurring
What type of software does your mom work on?
Specifically are the PIDs you are referring to Process IDentification numbers, or something else? You really need to look at the code and determine why the programmer thought that PID values under 10,000 were valid.
Re:"she can't get it signed off until she can explain why this check is failing a lot more over the past to weeks."
In general, if something starts behaving differently, it is because something changed.
You or your mom are in a better position to determine what has changed than anyone here.