[Info-vax] If sensitive with ! Data misalignment - Impacts codes/system performances

[A famous IT technical writer]

Dear reader,

If sensitive with unaligned data which impacts more or less codes/
system performances on every processor architecture, three special
studies on OpenVMS systems highlighting the benefit of data alignment:
http://vouters.dyndns.org/tima/OpenVMS-Cobol-Effect_of_the_ALIGN_compiler_qualifier.html
(read the FOREWORD section; the obtained performance figures call for
no discussion)
http://vouters.dyndns.org/tima/OpenVMS-IA64-Unaligned_data_accesses.html
(a study of the HP C compiler generated machine code on Itanium
processors when data is aligned or unaligned along with the
corresponding pseudo-algorithm)
http://vouters.dyndns.org/tima/OpenVMS-Alpha-IA64_Misaligned_pointers.html
(a performance impact study on both Alpha and Itanium processors of
misaligned pointers)

Aligned data is what HP suggests in all its literature but does not
always respect what it states for some products it sells:
http://vouters.dyndns.org/tima/OpenVMS-DECForms-DECForms_misalignments_and_performances.html

If you have been interest with, I shall be glad. This will mean more
performant codes over the market to the benefit of every end-users.
For your company, this will lead to your customers satisfactions,
possibly impacting revenues.

Philippe Vouters