I was at a business looking to switch from HPUX/ Solaris to RHEL (Red Hat Enterprise Linux). We had some HPUX realtime(ish) extensions and used IPC heavily and

I was at a business looking to switch from HPUX/ Solaris to RHEL (Red Hat Enterprise Linux). We had some HPUX realtime(ish) extensions and used IPC heavily and really used the scheduler/Processor set functionality in HPUX. The scheduling was important, so transitioning wasn't going to be easy (endian issues aside). They sent a bunch of us to a week long Linux Internals course at Red Hat. Really excellent class, knowledgeable instructor (turned us onto fedora, linux weekly news (https://lwn.net https://lwn.net) and centos before red hat partnered with them). When the class wasn't exactly what we expected the instructor took the last day to go over some of the processor scheduling/ real time extension stuff we needed to know (My company's employees were the only one taking the class). The OS transition was shelved for a bit and I ended up leaving that company, but the course really changed my mind about that company. Good for them.