LatencyGuy questions

• Is it realistic to use -O3 or -Ofast to compile your benchmark code or will it remove code?
• For the HotSpot JIT, what does "already compiled into a big method" mean?
• What are the lowest possible latencies for a FIX engine to send a FIX message from client to server?
• Is it possible to eliminate jitter from a Linux machine when running a simple single-threaded C++ program?

LatencyGuy answers