You might try this:
http://portal.acm.org/ft_gateway.cfm?id=29651&type=pdf
The above, "Mimic: A Fast System/370 Simulator", is also cited in patent
application 5,751,982.
http://www.google.com/patents?
hl=en&lr=&vid=USPAT5751982&id=6jAlAAAAEBAJ&oi=f
nd&dq=related:P7ZYcQqpZikJ:s
cholar.google.com/&printsec=abstract#
(Watch for line wrap in the above URL.)
Brian Nielsen
On Thu, 7 Jan 2010 11:37:00 -0600, Gary M. Dennis
<gary.den...@mantissa.com> wrote:
>The POPS For System z contains the following note:
>
>"
>Programming Note: For fixed-field-length operations with field lengths
that
>are a power of 2, significant performance degradation is possible when
>storage operands are not positioned at addresses that are integral
multiples
>of the operand length. To improve performance, frequently used storage
oper-
>ands should be aligned on integral boundaries.
>
>"
>
>Does anyone know what "significant performance degradation" means in ter
ms
>of true machine overhead?
>
>Is anyone aware of published degradation numbers for non-aligned fixed
>length field operations?
