So, since it is Cobol, would just a recompile with a recent compiler be sufficient to generate an efficient loadmodule?
We discussed a similar issue internally recently with regards to the new instructions that are available on today's machines and were not 10 or 20 years ago when an old module was compiled. Also for this reason, recompiling it could make it more efficient. Kees. "Staller, Allan" <allan.stal...@kbmg.com> wrote in message news:<45e5f2f45d7878458ee5ca679697335502e25...@usdaexch01.kbm1.loc>... > My first thought is data proximity to instructions. > > That is data being modified within the width of the processor I-cache. > > The data modification will cause cache flush of the I-cache, and many > processor cycles to re-establish the cache and various pipelines. > > This happened with SAS when the z/900 (?) processors came out. > > There should be a discussion in the archives about the SAS version of > this issue. > > The solution is to move the data far enough away from the instructions > so that the modification does not cause the cache to be flushed. > > > HTH, > > > <snip> > Hello, We recently installed a Z196 and we have one COBOL DB2 program > that is using twice the CPU time as before the new CPU. The program has > not been recompiled and the data volume is the same. IBM has found > nothing, yet. Strobe has not revealed any answers. All other programs > use about 1/2 of the CPU time now. Any help would be greatly > appreciated. > </snip> > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ******************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ******************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
