I'd like to ask about the rationale behind closing my question about compilers for AMD Bulldozer CPUs.

The FAQ for ServerFault states that questions about (quote)

• Server and Business Workstation operating systems, hardware, software and virtualization

are on topic, as long as its not just (quoted again)

• Product, service, or learning material recommendations

As I asked for benchmarks that are ultimately intended to optimize the utilization of servers (as opposed to concrete product recommendations), I don't see the problem. Even if you feel that this question is more on topic on Stackoverflow, why close it instead of migrating it?