Ladies and gentlemen,
as always, thanks for your replies.
Walter Marguccio
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On Fri, 19 Feb 2016 14:25:54 +, Walter Marguccio wrote:
>this is what my co-workers tell me, that the performance of the file transfer
>varies wildy.. They assumethis depends on how much the LPAR is busy, in
>terms of CPU.
I would be very surprised if CPU utilization, or even time time spen
File transfer speeds start slow then speed up. 1.2KB is nothing.
100KB is a bare minimum test size, but can fluctuate greatly due to
varying contention at the start of transfer even under similar network
loads. 1MB is large enough that a slow start has a small impact on
the total transfer time un
>this is what my co-workers tell me, that the performance of the file transfer
>varies wildy.. They >assumethis depends on how much the LPAR is busy, in terms
>of CPU.
Be carfeul with the transfer rates reported by ftp. It is heavily dependent on
the amount of data transferred. Just an examp
Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Walter Marguccio
Sent: Friday, February 19, 2016 9:26 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Which CP is used when ...
we have old OSA-Express-3 cards, 1Gbps. We use WLM SC for both batch and ftp,
the latter has higher
we have old OSA-Express-3 cards, 1Gbps. We use WLM SC for both batch and ftp,
the latter has higher importance (3) compared to batch.So far I haven't run any
trace.
> Check your transfer rates shown in EZA1617I messages. Are they varying
>wildly, even within a batch job?
this is what my co-work
Walter Marguccio wrote:
>Which might mean that if my zBC 12 is, say, 80% CPU busy, a given outbound
>trasmission will be slower comparedto the same transmission which takes place
>when the zBC 12 is only 20% CPU busy. .
Really?
>What my co-workers wants to know is whether an outbound ftp trans
; From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> Behalf Of Walter Marguccio
> Sent: Friday, February 19, 2016 6:10 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Which CP is used when ...
>
> Hello Peter,.> I this what you've been asking for? .well,
e if it is actually being delayed. If not, then that's as
good as it's going to get, regardless of CPU utilization.
Adam
-From: "Walter Marguccio"
To:
Cc:
Sent: Fri, 19 Feb 2016 13:10:05 +0000
Subject: Which CP is us
Hello Peter,.> I this what you've been asking for? .well, let's say your reply
helps me to understand better which processor (either the CP or the SAP, in
this case)is involved when a dataset is transmitted from z/OS to another box. I
understand that both CP and SAP are involved..Which might mea
On Fri, 19 Feb 2016 10:45:24 +, Walter Marguccio wrote:
> ... I use ftp to transfer a dataset from z/OS to a distributed maschine ?
>The CP ? The SAP (the I/O processor) ?
Both. All of the code that you see (or could see if not for OCO) runs on a CP.
The channel subsystem also has work to do
> ... I use ftp to transfer a dataset from z/OS to a distributed maschine ?
>The CP ? The SAP (the I/O processor) ?
Simplified view:
FTP code is running on the CP until it does a READ to read from the data set.
READ will eventually lead to SSCH to run the channel program. The SAP will take
... I use ftp to transfer a dataset from z/OS to a distributed maschine ?
The CP ? The SAP (the I/O processor) ?
Walter Marguccio
z/OS Systems Programmer
BELENUS LOB Informatic GmbH
Munich - Germany
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