]
Newsgroups: bit.listserv.ibm-main
To: IBM-MAIN@BAMA.UA.EDU
Sent: Wednesday, April 09, 2008 2:35 PM
Subject: Re: TIOT filling up: too many dynamic concatenations
Ed,
Field S99ERROR (after the dynamic concatenation request to DYNALLOC) is
coming back with a value of X'0238': Space unavailable
On Tue, 15 Apr 2008 21:45:34 -0300, Shmuel Metz (Seymour J.) wrote:
But this provokes an interesting question: If (as I believe) HFS data
sets are dynamically allocated in the OMVS address space (that's what's
cited when I try to delete one), isn't OMVS at extreme hazard of
impacting DVC etc.
Paul Gilmartin wrote:
Ah! colony address spaces; plural. Will OMVS create additional
colony address spaces as hundreds of filesystems are mounted, as
needed to avoid system limits on TIOT size, etc.?
This should not be an issue. Authorized programs are not constrained by
traditional
In a message dated 4/16/2008 12:28:54 P.M. Central Daylight Time,
[EMAIL PROTECTED] writes:
Authorized programs are not constrained by
traditional limits on TIOT size and 24-bit virtual storage. ...
Such programs can support literally hundreds of thousands of
simultaneous allocations.
(IBM Mainframe Discussion List) wrote:
They can also do I/O without any allocation, TIOT entry, DD statement,
enqueue, open, etc. All they need is a UCB address, some CCWs somewhere, and
about 150 bytes of ECSA.
Of course ... using the low-level STARTIO interface. But, dynamic data
set
On Wed, 16 Apr 2008 10:28:00 -0700, Edward Jaffe
[EMAIL PROTECTED] wrote:
Paul Gilmartin wrote:
Ah! colony address spaces; plural. Will OMVS create additional
colony address spaces as hundreds of filesystems are mounted, as
needed to avoid system limits on TIOT size, etc.?
This should not
In [EMAIL PROTECTED], on
04/09/2008
at 10:03 PM, McKown, John [EMAIL PROTECTED] said:
And doing QSAM I/O does avoid some problems with the LF or CRLF at
the end of the logical records.
Or NL if it's EBCDIC.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see
In [EMAIL PROTECTED], on 04/09/2008
at 05:52 PM, Paul Gilmartin [EMAIL PROTECTED] said:
But this provokes an interesting question: If (as I believe) HFS data
sets are dynamically allocated in the OMVS address space (that's what's
cited when I try to delete one), isn't OMVS at extreme hazard of
Why do you concatenate them that way? Why not just find/open/process
each independently? Or if you prefer, find all of them, then in a loop
(allocate, open, process, deallocate) each individually? Yes, it is a
bit more difficult to program, but it is infinitely scalable.
If this hasn't changed
Remember, z/OS emulates UNIX -- a CAT/READ/de-allocate is still
just as expensive.
It may quack like a duck; walk like a duck; it is an emulated duck.
There is no such thing as allocation and deallocation in UNIX,
incluiding z/OS UNIX. The z/OS UNIX kernel, more specifically, the
physical
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Hunkeler Peter (KIUK 3)
Sent: Thursday, April 10, 2008 1:14 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: TIOT filling up: too many dynamic concatenations
Why do you concatenate them
are not being reused by the concatenation but just
used for the information that they contain.
Date: Wed, 9 Apr 2008 13:35:28 -0500
From: [EMAIL PROTECTED]
Subject: Re: TIOT filling up: too many dynamic concatenations
To: IBM-MAIN@BAMA.UA.EDU
Ed,
Field S99ERROR (after the dynamic
Hunkeler Peter (KIUK 3) wrote:
Why do you concatenate them that way? Why not just find/open/process
each independently? Or if you prefer, find all of them, then in a loop
(allocate, open, process, deallocate) each individually? Yes, it is a
bit more difficult to program, but it is infinitely
My apologies if this has already been answered but I haven't seen it.
No apologies necessary!
The entry that was filling up was actually not MYFILE; that entry remained at
20 bytes. The ever-growing entry seemed to contain all of the history of the
concatenated DDs. With each new allocation
David,
Could you clarify whether you perform the concatenation just once per run, or
am I understanding that you perform multiple concatenations during each run?
--
Tom Schmidt
On Thu, 10 Apr 2008 15:13:58 -0500, David Eisenberg wrote:
The entry that was filling up was actually not
: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf
Of David Eisenberg
Sent: Thursday, April 10, 2008 3:14 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: TIOT filling up: too many dynamic concatenations
My apologies if this has already been answered but I haven't seen it.
No apologies
On Thu, 10 Apr 2008 15:34:29 -0500, Wayne Driscoll wrote:
David,
I would have to agree with the posters that felt that the best way to handle
this would be to use the z/OS UNIX services to read the files. While this
does mean that you will need 2 code paths, one for UNIX files and a second
one
Anyone,
I have a mainframe assembler application which is invoking Unix system
services to get the names of all of the files in an NFS-mounted folder. The
application dynamically allocates and logically concatenates these files into
one giant dataset, then uses QSAM macros to read it.
The
David Eisenberg wrote:
The problem is that I have reached a practical limit of approximately 540 files
in the folder, because when I reach that point, I get a dynamic concatenation
ABEND due to the TIOT filling up. I am told that our TIOT size is the default of
32K, which would allow for a
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of David Eisenberg
Sent: Wednesday, April 09, 2008 1:17 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: TIOT filling up: too many dynamic concatenations
Anyone,
I have a mainframe assembler
Ed,
Field S99ERROR (after the dynamic concatenation request to DYNALLOC) is
coming back with a value of X'0238': Space unavailable in task input output
table (TIOT). The manual says that the application should Reduce the total
number of allocated DDs and devices. Deallocate data sets that are
Yes, it is a bit more difficult to program, but it is infinitely scalable.
Of course, you are correct. I took this approach because I have inherited a
pre-existing application that used to read a single mainframe dataset. It's
only
recently that the capability to read multiple files via NFS
-Original Message-
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of David Eisenberg
Sent: Wednesday, April 09, 2008 1:17 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: TIOT filling up: too many dynamic concatenations
Anyone,
I have a mainframe assembler application which
Hi Ed:
Maybe not the best solution but you can increase the size of the TIOT in the
ALLOCxx parmlib member in the z/OS MVS Initialization and Tuning Reference
_http://publibz.boulder.ibm.com/epubs/pdf/iea2e261.pdf_
(http://publibz.boulder.ibm.com/epubs/pdf/iea2e261.pdf) page 73. The
Try putting DYNAMNBR=1024 on your EXEC card.
Just tried it; no good. Same result as before. Thanks, though.
David
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-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of David Eisenberg
Sent: Wednesday, April 09, 2008 1:42 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: TIOT filling up: too many dynamic concatenations
Yes, it is a bit more difficult
You didn't say what language you are writing in.
Mainframe assembler.
Your suggestion would work, but then I would have to get into an argument
with the network guys when I tell them that I need twice as much disk just so
that I can do a physical concatenation of all of the files. I don't
Try putting DYNAMNBR=1024 on your EXEC card.
Just tried it; no good. Same result as before.
That's because your TIOT size is still 32K.
As somebody stated, the short term solution is to bump it up to 64K.
The long term would be (imo) re-write the programme to open one file at a time.
-
Too
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of David Eisenberg
Sent: Wednesday, April 09, 2008 2:19 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: TIOT filling up: too many dynamic concatenations
You didn't say what language you
On Wed, 9 Apr 2008 13:16:58 -0500, David Eisenberg wrote:
I have a mainframe assembler application which is invoking Unix system
services to get the names of all of the files in an NFS-mounted folder. The
application dynamically allocates and logically concatenates these files into
one giant
On Wed, 9 Apr 2008 13:16:58 -0500, David Eisenberg wrote:
I have a mainframe assembler application which is invoking Unix system
services to get the names of all of the files in an NFS-mounted folder. The
application dynamically allocates and logically concatenates these files into
one giant
On Wed, 9 Apr 2008 14:54:53 -0500, McKown, John wrote:
I think that is the best idea. Hopefully it won't be too difficult. I
can think of some other methods, but they are very UNIXy and weird.
Such as creating a named pipe, fork()'ing then exec()'ing /bin/cat in
the child to write to the pipe
The dataclass Dynamic Volume Count (DVC) is (DSN DD + DVC amount) for
each dataset allocated. If the DVC is 20, the that would equate to 21
DDs in TIOT times however many datasets allocated.
Terry Traylor
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For IBM-MAIN
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Traylor, Terry
Sent: Wednesday, April 09, 2008 4:11 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: TIOT filling up: too many dynamic concatenations
The dataclass Dynamic Volume Count (DVC
On Wed, 9 Apr 2008 16:15:26 -0500, McKown, John wrote:
-Original Message-
[mailto:[EMAIL PROTECTED] On Behalf Of Traylor, Terry
Sent: Wednesday, April 09, 2008 4:11 PM
The dataclass Dynamic Volume Count (DVC) is (DSN DD + DVC amount) for
each dataset allocated. If the DVC is 20,
IBM Mainframe Discussion List IBM-MAIN@BAMA.UA.EDU wrote on 04/09/2008
02:16:58 PM:
I have a mainframe assembler application which is invoking Unix system
services to get the names of all of the files in an NFS-mounted folder.
The
application dynamically allocates and logically
On Wed, 9 Apr 2008 17:52:47 -0500, Paul Gilmartin [EMAIL PROTECTED] wrote:
But this provokes an interesting question: If (as I believe) HFS
data sets are dynamically allocated in the OMVS address space
(that's what's cited when I try to delete one), isn't OMVS at
extreme hazard of impacting DVC
On Wed, 9 Apr 2008 19:13:19 -0400, Jim Mulder wrote:
Is it necessary to concatenate all of the files? Could you
restructure the program so that it allocates, opens, reads, closes,
and unallocates each file sequentially? If the purpose is simply
to read and process all of the records in all of
How would the performance of a scheme that allocates, opens, reads, closes,
and unallocates each file sequentially (or concatenated, which still does
most of the same work) compare with allocating
a single POSIX pipe and using BPX1* system calls to copy the various NFS files
into it? My gut
-Original Message-
From: IBM Mainframe Discussion List
[mailto:[EMAIL PROTECTED] On Behalf Of Paul Gilmartin
Sent: Wednesday, April 09, 2008 7:47 PM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: TIOT filling up: too many dynamic concatenations
On Wed, 9 Apr 2008 19:13:19 -0400, Jim
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