alt Hacker NewsA total of seven architectures are officially supported for "trixie":
"trixie"
64-bit PC (amd64),
64-bit ARM (arm64),
ARM EABI (armel),
ARMv7 (EABI hard-float ABI, armhf),
64-bit little-endian PowerPC (ppc64el),
64-bit little-endian RISC-V (riscv64),
IBM System z (s390x)
I do wonder, where are PowerPC and IBM System z being used these days? Are there modern Linux systems being deployed with something other than amd64, arm64, and (soon?) riscv64?
Replies
Both Power and z are many billion dollar businesses each. Banking and other high finance is the stronghold for both. IBM still seems proud of z, Power seems merely tolerated these days which is a shame because it is a nice ISA and the systems are very nice too.
IBM puts a lot of work and money into making sure open source stuff runs properly on those two, even if they aren't that popular
them being kept by major distros is therefore not as "natural" as other architectures
> I do wonder, where are PowerPC and IBM System z being used these days?
IBM.
And they own redhat, so I imagine they put a lot of time and money into making the kernel work.
Why Debian in particular, not sure.
Very important to note the lack of x86 (32bit x86) support.
The end of an era.
Mainframes are still holding on in use cases where a single server having continuous uptime is vital. They're designed to have uptime measured in decades, so even components like the processors and main memory have hot spares available and can be hot-swapped without interrupting the OS or running services. They also have continually running system monitoring and diagnostics at the hardware level (not running as an OS service) that will alert both the owner and IBM if they detect some sort of hardware fault. IBM has supported Linux as a first-class OS option for their mainframes since the early 2000s.
From a developer perspective, s390x is also the last active big-endian architecture (I guess there's SPARC as well, but that's on life support and Oracle doesn't care about anyone running anything but Solaris on it), so it's useful for picking up endianness bugs.
Another interesting thing is that the only two 32-bit architectures left supported are armel and armhf. Debian has already announced that this will be the last release that supports armel (https://www.debian.org/releases/trixie/release-notes/issues....), so I guess it'll be a matter of time before they drop 32-bit support altogether.