Thanks Jim.
----- Original Message -----
From: "Jim Mulder" <[EMAIL PROTECTED]>
Newsgroups: bit.listserv.ibm-main
To: <[email protected]>
Sent: Wednesday, July 05, 2006 2:35 PM
Subject: Re: Questions on Dedicated Processors
David Day <[EMAIL PROTECTED]> wrote on 07/03/2006 05:35:16 PM:
1. Does a dedicated processor have an entry in the PCCA? If so,
is there some way to recognize the entry as one belonging to a
dedicated processor? Only thing I can find in any doc is the data
areas manual has something at offset 17c into the PCCA.
If you mean dedicated vs. shared processors in the LPAR sense,
that is indicated in IHACSD by
CSDNDPAR EQU X'10',,C'X' - RUNNING IN NON-DEDICATED PARTITION.
In a z/OS LPAR, either all processors are dedicated, or they are
all shared.
To determine the type of a processor, look at
CSD_CP_MASK
CSD_IFA_MASK
CSD_zIIP_MASK
I would recommend that you avoid accessing the PCCA unless you have
proper serialization (i.e. you are disabled for I/O and external
interrupts).
2. The announcement I read states the zIIP does not process
general interrupts. That makes sense since they want to dedicate
the processor to specific work, so any type of general interrupt
needing to be processed has to get handled on a general purpose
processor. But the announcement also states the zIIP does not
process IO, nor can it handle timer events. Is there more doc
available anywhere on what is involved in this part of it?
z/OS does not use the clock comparator to time events on a zIIP,
and z/OS does not enable for any interrupt subclasses in control
register 6 on a zIIP.
3. If an SQL statement should happen to abend at some point in
it's processing, and I'm looking at a dump, will I see activity
formatted in the trace table in the dump for the zIIP?
System trace on a zIIP is no different from system trace on a zAAP
or a general purpose CPU.
Jim Mulder z/OS Dump Whisperer IBM Corp. Poughkeepsie, NY
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