As mentioned already, its all about the TLB. With memory intensive tasks
using large pages, it lessens the usage of TLB from what would otherwise be
the case, and that potentially benefits (by DAT avoidance) not only the
task using large pages, but also every other workload utilising that TLB
Hello,
we start using LFAREA (1M pages) with z/OS 1.13 and DB2 10 on z196.
From IBM I read: Using large pages can improve performance for some
applications by reducing the overhead of dynamic address translation.
We wonder how to measure this performance improvement. What we're trying now
is
I've rolled it out into 2 of our test LPARs and have been using the HIS 113
records to try and measure the improvement. Specifically looking at the
percentage of TLB miss processor cycles. I haven't seen an improvement
using that metric, going into production this month so stay tuned.
On Thu,
On Thu, 2 May 2013 06:07:13 -0500, Markus Haselbach
markus.haselb...@credit-suisse.com wrote:
Hello,
we start using LFAREA (1M pages) with z/OS 1.13 and DB2 10 on z196.
From IBM I read: Using large pages can improve performance for some
applications by reducing the overhead of dynamic address
written agreement
or government initiative expressly permitting the use of e-mail for such
purpose.
From: Anthony Hirst ahir...@gmail.com
To: IBM-MAIN@listserv.ua.edu
Date: 05/02/2013 10:11 AM
Subject:Re: Performance gains with LFAREA ?
Sent by:IBM Mainframe Discussion List
: Thursday, May 02, 2013 16:30
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Performance gains with LFAREA ?
I suspect that any real performance gains will happen with the EC12
processor equipped with flash memory as a paging device.
Vacation Notice: None
Tom Puddicombe
Mainframe Performance Capacity
On Thu, 2 May 2013 10:30:09 -0400, Thomas H Puddicombe tpudd...@csc.com wrote:
I suspect that any real performance gains will happen with the EC12
processor equipped with flash memory as a paging device.
Vacation Notice: None
Tom Puddicombe
Mainframe Performance Capacity Planning
CSC
The
Subject:Re: Performance gains with LFAREA ?
Sent by:IBM Mainframe Discussion List IBM-MAIN@listserv.ua.edu
On Thu, 2 May 2013 10:30:09 -0400, Thomas H Puddicombe tpudd...@csc.com
wrote:
I suspect that any real performance gains will happen with the EC12
processor equipped with flash
On 5/2/2013 7:18 AM, Mark Zelden wrote:
Obviously there is an underlying CPU usage improvement, but I'm not
sure where it would show up in (*master*)?
Better TLB coverage means fewer DAT translations thus faster execution.
The CPU savings should show up directly in the TCB/SRB time of
On 5/2/2013 7:47 AM, Mark Zelden wrote:
The zEC12 allows large pages to be paged to flash. While that may
lessen the need for the total amount of real storage, how can it be
better performing than fixed 1M pages that are the only option for
large pages prior to the zEC12 with flash?
LOL.
I think one person found a lot of OpenMVS programs being repeatedly
loaded. So they wrote a little program that LOADed the object modules
into the LF area and ended. They now remain in core until shutdown.
--
Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it
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