Update JURON.md

JURON.md

@@ -42,3 +42,15 @@ JURON uses LSF as its method of running jobs on the GPU-equipped compute nodes.
 JURON und JURECA both share a common file system (*GPFS*). For working on both machines simultaneously, a dedicated folder for a build on each machine might be helpful.
 
 JURECA offers `$HOME` and `$WORK` for long-term and short-term (but somewhat faster) storage of data. JURON offers both locations as well, but without any difference in connection speed.
+
+## Useful GCC compiler options
+ -Ofast 
+ 
+ -flto -- Enable link-time optimization
+ 
+ -mcpu=power8 -- Set architecture type, register usage, and instruction scheduling parameters for POWER8
+ 
+ -mveclibabi=mass -- Use the MASS vector library for vectorization
+ 
+ 
+ IBM compiler flags for the SPEC CPU benchmarks (P7): https://www.spec.org/cpu2006/results/res2013q3/cpu2006-20130729-26110.txt
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