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What exactly does a mainframe mean today? I’ve logged onto multi user computer systems via a thin client before, but I guess the hardware I was connecting to wa
by iamnotwhoiam 5y ago
What exactly does a mainframe mean today? I’ve logged onto multi user computer systems via a thin client before, but I guess the hardware I was connecting to was probably commodity so not a mainframe? Do these things run Windows/Linux or is this some super proprietary OS2 descendent or what?
- rwmj 5y agoThe article answers this in the first few paragraphs. Mainframes are extremely reliable and have high I/O bandwidth (and relatively poor CPU performance). You can run Linux on them - Red Hat ship and support RHEL for s390x - but most of the time they run z/OS along with z/VM. https://en.wikipedia.org/wiki/Z/OS https://en.wikipedia.org/wiki/Z/OS
- iamnotwhoiam 5y agoBut 5ghz is an incredibly high clock speed. Is the cpu hampered in other ways?
- rwmj 5y agoI use z14 at work and it's not especially fast for single thread stuff. For the applications that typically run on these, performance of the entirely separate channel controllers (I/O) is what matters.