https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.ieab100/reus.htm
BTW Your 'refreshable' ...
PTR DCA(0)
label L R15,PTR
LTR R15,R15
BNZ CALLIT
...... Code that always leaves the same value in R15
On 2/8/2021 12:36 PM, Edward Finnell wrote:
Senoir Jaffe should chime in directly...
Haha! Okay...
Jerry,
If you look in your INISH deck, you should see MAIN and MSGROUTE
definitions. You simply clone those to define new systems. Here is a
three-way JESplex from one of our environments:
The refreshable code in OS/360 ran in key 0. There wa no APF, and Fetch didn't
look at the RENT attribute. Fetch loaded code from the link list into SP 252,
which was key 0, but some of that code was self modifying.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
That "therefore" is incorrect. Nor would refreshing my example cause an
incorrect branch. If you'll give me the URL I'll submit a RCF.
There's now way that z/OS will refresh anything smaller than a page, much less
smaller than a word.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
On Mon, 8 Feb 2021 22:35:13 +, Seymour J Metz wrote:
>IBM initially only used REFR in the Machine Check Handler (MCH), which could
>recover from a parity error in, e.g., a transient SVC, by reading in a fresh
>copy. There was no non-modifiable storage at the time.
>
Couldn't storage keys
Discarded from main storage.
If it were up to me REFRPROT would be the default, but IBM has better data than
I do and doesn't agree.
The last I looked, MVS does not write back a modified PLPA page before stealing
it. I don't know how difficult it would be to do the same for full page RENT
On Mon, 8 Feb 2021 17:15:36 -0500, Steve Smith wrote:
>
>z/OS (and ancestors) already decided RENT means a module can be loaded into
>non-modifiable storage, so what is the point of REFR anyway?
>
Not quite. A RENT module may modify itself provided that it serializes
(Lock, ENQ, CS, ...) to
IBM initially only used REFR in the Machine Check Handler (MCH), which could
recover from a parity error in, e.g., a transient SVC, by reading in a fresh
copy. There was no non-modifiable storage at the time.
REFR stopped being relevant in SVS, and only became relevant with the support
of
> > This is refreshable, and even runs on S/360
>
> PTR DCA(0)
> label L R15,PTR
> LTR R15,R15
> BNZ CALLIT
> ...... Code that always leaves the same value in R15
> STR15,PTR
> CALLIT BALR R14,R15
According to
That's what I've been wondering. If, as in 99.99% of the cases, a REFR
module does *not* modify itself, then ASM/RSM will know that when it
matters, and will *not* page it out (after the first time). Logically, it
would seem REFR would imply that OK, I know I've diddled myself, but it's
OK, no
On Mon, 8 Feb 2021 21:47:06 +, Seymour J Metz wrote:
>AFAIK nothing from OS/360 through z/OS has ever discarded modified pages
>containing refreshable coded other than PLPA and SVC transient areas.
>
"Discarded" from main storage or from page data sets?
A Modest Proposal:
o Retain page
AFAIK nothing from OS/360 through z/OS has ever discarded modified pages
containing refreshable coded other than PLPA and SVC transient areas.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List
On Mon, 8 Feb 2021 18:44:39 + "Farley, Peter x23353"
<031df298a9da-dmarc-requ...@listserv.ua.edu> wrote:
:>There is a potentially meaningful performance hit only if the load module /
program object is marked refreshable. For the non-refreshable case, the
one--time performance hist (the
>I am receiving message
>
>IGZ0099C Internal error CLLE-GPCB was detected in module IGZCEV19
>
>after compiling a COBOL/ASSEMBLER system with COBOL V6.2
>
>The LE manual does not include these values for the IGZ0099C message. Where
>might this be documented?
Maybe you are trying to run on a
Senoir Jaffe should chime in directly...
This is not a very active list, but you could also join and post there
-Original Message-
From: Lizette Koehler
To: IBM-MAIN@LISTSERV.UA.EDU
Sent: Mon, Feb 8, 2021 2:33 pm
Subject: Re: Question about converting JES3 to JES3plex
This is not a
This is not a very active list, but you could also join and post there
JES3http://www.listserv.uga.edu/archives/jes3-l.html
Lizette
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of
Edgington, Jerry
Sent: Monday, February 8, 2021 1:11 PM
To:
I have a base SYSplex setup, but I still need to setup JES3 in Plex mode. I
have worked with JES3 in the past, but never reconfigured JES3 into a JES3plex.
So, look for some advice on what definitions to change, and what are some
gothas to avoid. I will need to modify the current running
The rule of thumb is to look at your hot spots first. If the monitoring doesn't
narrow it down enough, you can always use SLIP PER SA on the address range.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List
Thanks a lot, I didn't think of this ...
of course it is very important when fixing such SIIS issues
to check if the store is indeed done a significant part of the time
or - as in this case - only once a day.
In my customer's case there were/are other places to fix,
but probably not these.
Kind
There is a potentially meaningful performance hit only if the load module /
program object is marked refreshable. For the non-refreshable case, the
one--time performance hist (the first time ST R15,PTR is executed) is trivial
compared to the potential cost of getting the called program
In article you wrote:
> Dear Folks,
>
> Is there a FREE tool to disassemble an object deck directly
> (without linkediting it first)??? I know that STARTOOL READOBJ can do it,
> but that's an expensive "pay product".
>
> Thanks much for any ideas or programs.
>
> All
On Feb 8, 2021, at 12:04 PM, Seymour J Metz wrote:
>
> My original code had the DC after everything else. But if the DC is too close
> to the code, then there will be a performance hit. Even if not, it's ugly.
> Not everything that is possible is desirable.
>
The ugliness may be more
On Mon, 8 Feb 2021 at 11:33, Sam Golob wrote:
> Is there a FREE tool to disassemble an object deck directly
> (without linkediting it first)? I know that STARTOOL READOBJ can do it,
> but that's an expensive "pay product".
If you just want to disassemble some short instruction sequences,
My original code had the DC after everything else. But if the DC is too close
to the code, then there will be a performance hit. Even if not, it's ugly. Not
everything that is possible is desirable.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
There are cases wher that code is bulletproof. But it's still ugly.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Paul Gilmartin
On 2021-02-08, at 09:59:44, Seymour J Metz wrote:
>
> If the calculated address is always the same then there is no TOCTTOU issue,
> but I still consider it bad form.
>
As wrtten, no TOCTTOU. But if the address is re-fetched
elsewhere in the module, TOCTTOU threatens. The test must
be
Some insights into this SIIS topic:
https://www.ibm.com/support/pages/identifying-%E2%80%9Cstore-instruction-stream%E2%80%9D-siis-inefficiency-using-cpu-mf-counters
Kind regards
Bernd
Am 08.02.2021 um 18:42 schrieb Pew, Curtis G:
On Feb 8, 2021, at 11:38 AM, Gibney, Dave wrote:
On Feb 8, 2021, at 11:38 AM, Gibney, Dave wrote:
>
>
> PTR DCA(0)
> label L R15,PTR
> LTR R15,R15
> BNZ CALLIT
> ......Code that always
> leaves the same value in R15
> STR15,PTR
>
Would
> This is refreshable, and even runs on S/360
PTR DCA(0)
label L R15,PTR
LTR R15,R15
BNZ CALLIT
......Code that always
leaves the same value in R15
STR15,PTR
CALLIT BALR
Correct me if I am wrong, but isn't error 24 just "I ran out of space", like an
x37 abend for a sequential file that ran out of extents due to too-small
primary/secondary allocations?
How much primary and secondary space was specified for the data component of
the (4, 4) copy? How much space
On Mon, 8 Feb 2021 17:02:01 +, Farley, Peter x23353
wrote:
>Obvious application-level solution: Make sure your program occupies whole
>pages by adding adjusted DC XL at the end to get to a 4096-byte boundary.
>
Length is limited to 256. With hardware generations, pages get larger
DISASM was in the field engineering library. When it starts, it tells that its compilation was jan
1968. Just send a copy to Sam.
Peter Sylvester
--
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to
Greetings,
After REPRO-ing a VSAM KSDS file defined with shareoptions (4,3) to a file
defined with shareoptions (4,4), we started receiving the following error
on a write attempt (COBOL program):
Status key=24
Meaning: An attempt was made to write beyond the externally defined
boundaries of a
When you design an OS you can do it that way ...
Charles
-Original Message-
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
Behalf Of Seymour J Metz
Sent: Monday, February 8, 2021 9:03 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: LINK vs LOAD/CALL.
Why not
There was an old free disassembler that Gerhard substantially enhanced; I'd be
very surprised if you didn't have a copy somewhere.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on
Why not have a separate subpool for page-protected storage with Fetch enabling
store temporarily?
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Charles Mills
Obvious application-level solution: Make sure your program occupies whole pages
by adding adjusted DC XL at the end to get to a 4096-byte boundary.
-Original Message-
From: IBM Mainframe Discussion List On Behalf Of
Charles Mills
Sent: Monday, February 8, 2021 11:57 AM
To:
If the calculated address is always the same then there is no TOCTTOU issue,
but I still consider it bad form.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Paul
Storage protection is page by page. So ... design tradeoff decision:
- Leave any part of the program that occupies a partial page unprotected.
- "Waste" the remainder of the partially-occupied page.
IBM obviously chose the former.
Charles
-Original Message-
From: IBM Mainframe
Even where there is no perfomance hit I would consider it bad form.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Bernd Oppolzer [bernd.oppol...@t-online.de]
Sent:
> Therefore, any parts of the program that are on partial pages are not
> page-protected.
Ouch! Why?
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Peter Relson
Hi Sam,
I recall that I had a very simple program called DISASM, which ran on
VM/CMS,
and read normal FB80 object files, and it produced reasonable output.
But this was in the 1980 thru 199x time frame, and I don't know
- if it is still around
- where it came from
- if it will run on OS/360
Dear Folks,
Is there a FREE tool to disassemble an object deck directly
(without linkediting it first)? I know that STARTOOL READOBJ can do it,
but that's an expensive "pay product".
Thanks much for any ideas or programs.
All the best of everything to all of you.
Sincerely,
The effect of REFRPROT has long been enforced for modules loaded
from APF libraries.
Only for non-key-0 programs. Putting code into key 0 storage is not all
that REFRPROT does.
Does REFRPROT have a "warn" setting?
No. What would it warn about? That you loaded a refreshable program? You
SOLVED
//ICETOOL EXEC PGM=ICETOOL,REGION=1024K
//TOOLMSG DD SYSOUT=*
//DFSMSG DD SYSOUT=*
//SHOWDEF DD SYSOUT=*
//OCCRPT DD
thank you ... but I want a list of all volumes and their occupation.
for the panel, I only get 1 volume and for REPORT5 that of the datasets.
--
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to
W dniu 08.02.2021 o 10:03, Jordi Bornay pisze:
I come across a similar case, but my goal is to know the total bytes used or
the percentage of cartridge used.
I've searched for topics and I've only found this one from REPORT5, which
doesn't work for me.
I've looked in the DFrmm manual and
I come across a similar case, but my goal is to know the total bytes used or
the percentage of cartridge used.
I've searched for topics and I've only found this one from REPORT5, which
doesn't work for me.
I've looked in the DFrmm manual and couldn't see anything.
Can somebody help me? thanks
Thanks for that.
I would like to add, that I was working for a customer which has
the first coding at very many places in almost every module,
because it is included in a global macro. The problem with modern
processors is,
that if the location PTR to store the address is in the same cache line
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