not sure if the link is broken but the article is about using the CS-6400 for a build machine, not the YMP. Generally the YMP would make a bad "build machine" - parallel vector Cray systems were slow as shit doing scalar things like compiling code. I was fortunate enough to work on 3 pre-release 6400 series machine, they were not supercomputers per se (at least in our opinion) but rather large Sun Solaris servers capable of up to 64 CPUs (a lot for the day); this line eventually turned into the E10K from Sun IIRC. We had 3 of them and once the bugs got worked out, we were able to keep them running.