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Solaris runs on commodity x86-64 hardware, Oracle offers installers for download and a free license for development use, and there is an open source fork (Illum

Solaris runs on commodity x86-64 hardware, Oracle offers installers for download and a free license for development use, and there is an open source fork (Illumos) which is 99% compatible. Given all of this, it isn’t hard for open source developers to setup CI/dev/test environments to support Solaris x86-64 as part of their project. SPARC is harder (hardware availability), but if it builds on Solaris SPARC and tests fine on Solaris x86-64, it is probably going to run on Solaris SPARC too. There are some potential gotchas around memory model differences and endianness, but one can just punt those issues until a user reports them, and then say “we can’t fix it unless you let us use your hardware” AIX only runs on non-mainstream hardware (POWER), plus IBM isn’t as open as Oracle is with providing access to it. This makes it significantly harder to support than Solaris is Added to that, Solaris and Linux are closer to begin with. Historically, Linux copied a number of its APIs from Solaris; AIX was far less of an influence. Years ago, I had to port some psuedoterminal management code from Linux to both Solaris and AIX. I only had to make some minor changes to the Linux code to make it work on Solaris; the changes I had to make to get it to work on AIX were much more extensive

macdice 3y ago
Well said. I've been able to debug PostgreSQL issues reported by [closed] Solaris users by booting illumos inside a virtual machine on my laptop in minutes... I want to keep AIX support, for, well mainly irrational nostalgic reasons -- PostgreSQL used to run on pretty much the entire Unix family tree, and I wrote lots of code on AIX for a decade. But they make it hard. I don't know why an OS vendor wouldn't make an image of an OS available to developers as conveniently as possible (it is even possible to boot recent AIX versions on QEMU if you have the patience... the hypothesis is that they might have done work to make that possible, 'cause it didn't work in earlier versions; but you can't get an image of OS, so shrug).
- skissane 3y ago
  The easiest legal way to get an AIX box is via IBM Cloud. You can get a tiny AIX box (s922 in Dallas, 0.25 cores, 2GB RAM, 10GB disk) for about US$50 a month. About US$8/month of that is AIX licensing and the rest is the hardware cost. Still a lot cheaper than IBM i licensing, which is US$350/month even for such a low-end system, or IBM Z (which is around US$1600/month for a low-end system). IBM Cloud does offer some free credits – at the moment US$1000 free VPC credits – but I'm not sure if you can use them on AIX (which isn't part of their main VPC offering, POWER is a separate offering), and even if you can, they aren't going to last forever. If one is an open source developer doing this on one's own time, as opposed to a business – why spend US$50/month to get an AIX environment? Maybe, if a user of the project really wants AIX support, they could donate that to the project.

macdice 3y ago

Well said. I've been able to debug PostgreSQL issues reported by [closed] Solaris users by booting illumos inside a virtual machine on my laptop in minutes... I want to keep AIX support, for, well mainly irrational nostalgic reasons -- PostgreSQL used to run on pretty much the entire Unix family tree, and I wrote lots of code on AIX for a decade. But they make it hard. I don't know why an OS vendor wouldn't make an image of an OS available to developers as conveniently as possible (it is even possible to boot recent AIX versions on QEMU if you have the patience... the hypothesis is that they might have done work to make that possible, 'cause it didn't work in earlier versions; but you can't get an image of OS, so shrug).

skissane 3y ago
The easiest legal way to get an AIX box is via IBM Cloud. You can get a tiny AIX box (s922 in Dallas, 0.25 cores, 2GB RAM, 10GB disk) for about US$50 a month. About US$8/month of that is AIX licensing and the rest is the hardware cost. Still a lot cheaper than IBM i licensing, which is US$350/month even for such a low-end system, or IBM Z (which is around US$1600/month for a low-end system). IBM Cloud does offer some free credits – at the moment US$1000 free VPC credits – but I'm not sure if you can use them on AIX (which isn't part of their main VPC offering, POWER is a separate offering), and even if you can, they aren't going to last forever. If one is an open source developer doing this on one's own time, as opposed to a business – why spend US$50/month to get an AIX environment? Maybe, if a user of the project really wants AIX support, they could donate that to the project.