Compiler Optimisations For absolute maximum performance, ensure that all of For absolute maximum performance, ensure that all of the software is compiled to take advantage of the the software is compiled to take advantage of the available hardware. available hardware. Enable all compiler optimizations with Enable all compiler optimizations with -O3 -O3 Tune the code to your CPU via Tune the code to your CPU via -march –mcpu -march –mcpu CPU specific features CPU specific features -msse –mmmx -mfpmath=sse -msse –mmmx -mfpmath=sse Drop debug data -fomit-frame-pointer Drop debug data -fomit-frame-pointer export CFLAGS="-O3 -msse -mmmx -march=pentium3 -mcpu=pentium3 -funroll-loops -mfpmath=sse -fomit-frame-pointer" Compiler/Opcode Caches Each PHP script is compiled only once for Each PHP script is compiled only once for each revision. each revision. Reduced File IO, opcodes are being read from Reduced File IO, opcodes are being read from memory instead of being parsed from disk. memory instead of being parsed from disk. Opcodes can optimised for faster execution. Opcodes can optimised for faster executio