I would think that the relevant issue for DFP is accuracy. In financial calculations, errors introduced by conversions between binart and decimal could have severe consequences.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of René Jansen [rene.vincent.jan...@gmail.com] Sent: Wednesday, March 22, 2023 12:42 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: watching JIT generated machine instructions on z/OS Without reading any documentation (sorry!), the issue at hand is this. I want to show the performance gains of using DFP (Decimal Floating Point) for the typical financial application, after I noticed at some other client their bought packages seldom were compiled using the right compiler options (some could have run in 1966 or so - well I exaggerate, but a Z9 would not have been a problem). This is for Java applications, and it proves slightly harder than I thought. I don’t have object modules to disassemble and while I can do -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly on my mac or any Linux box, IBM’s J9 seems to ignore these altogether. For Linux and the mac there is a .so (or .dylib) that even disassembles what you’d otherwise are shown in hex - https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchriswhocodes.com%2Fhsdis%2F&data=05%7C01%7Csmetz3%40gmu.edu%7C3394774f98ab46e4740708db2af4874c%7C9e857255df574c47a0c00546460380cb%7C0%7C0%7C638151001950394674%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=917xRPfUzJ7ZZJrNZnfkdTgrmQ7RInY0Y8G9cF3xr4E%3D&reserved=0 which is called hsdis but what I would not upload to other people’s machines lightly without building it myself. Does anybody know how to ask the J9 (Java 8) on z/OS how to show me what it does when the JIT decides native code would be best? many thanks in advance, best regards, René Jansen. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
