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Pretty much every fortune 500 that's been around for more than 30 years. Batch processing primarily - from closing their books to order processing, differs by
by tw04 2y ago
Pretty much every fortune 500 that's been around for more than 30 years. Batch processing primarily - from closing their books to order processing, differs by company. But if you ask the right person, they'll tell you where it's at.
- tgv 2y agoFortune 500? More like Fortune 50000 (ok, exaggeration). But there are so many banks in the world, and their automation can run back to the 1950s. They are only slowly moving away from mainframes, if only because a rewrite of a complex system that nobody understands is tough, and possibly very costly if it is the key to billions of euros/dollars/...
- justin66 2y agoThat's all true, but these machines often run java code. That's something to contemplate.
- rbanffy 2y agoIBM prices processors differently for running COBOL and Java - if you run mostly Java code, your monthly licensing fees will be vastly different. On boot, the service elements (their BMCs - on modern machines they are x86 boxes running Linux) loads microcode in accordance to a saved configuration - some CPUs will run z/OS, some will run z/OS and COBOL apps, some will run Java, some will run z/VM, some will run Linux. This is all configured on the computer whose job is to bring up the big metal (first the power, then the cooling, and only then, the compute). Under everything on the mainframe side is the PR/SM hypervisor, which is, IIRC, what manages LPARS (logical partitions, completely isolated environments sharing the same hardware). The cheapest licensing is Linux under a custom z/VM (they aren't called z but LinuxONE), and the most expensive is the ability to run z/OS and COBOL code. Running Java under z/OS is somewhat cheaper. Last time I saw it, it was very complicated.