COMPILE

You may pass the following settings to `make`:
    * VERSION=	 DEBUG : compile with O0 and debug flags
      		 SYMBOL :  compile with O3 and -g
		 O0 : compile with -O0
		 O1 : compile with -O1
		 O2 : compile with -O2
		 O3 : compile with -O3 (default)
    * OPTIK= 0 : compile with ticket-lock-based OPTIK
             1 : compile with versioned-lock-based OPTIK
	     2 : compile with non-atomic TTAS+version OPTIK (version is accessed in critical section)
    * GC=0 or GC=1 : disable/enable GC (default is 1)
    *         GC=2 : disable GC and use malloc
    * WORKLOAD= 0 : normal uniform workload
      		1 : workload with phases where everyone is doing insertions
		2 : skewed workload with zipfian keys (configura skew: ZIPF_ALPHA in random.h)
    * TEST=old : use the old test.c file (disables GC)
    * TEST=correct : use the test_correct.c file (enables GC)
    * LATENCY= 1 : enable per operation latency measurements with getticks
      	       2 : enable per operation latency measurements with sspfd (only id==0 prints results)
	       3 : enable per operation latency measurements with sspfd (all cores print results)
	       4 : enable latency measurements of the parse phase of ops (only id==0 prints results)
	       5 : enable latency measurements of the parse phase of ops (all cores print results)
	       6 : enable latency distribution measurements (boxplot)
    * GRANULARITY=GLOBAL_LOCK (or G=GL) for global lock
    * INIT=all : initialize the structure from all threads (default is from one)
    * SET_CPU=0 : does not pin threads to cores (does this by default) 
    * POWER=1 : enable power measurements with rapl_read library (default is 0)      	    
    * RO_FAIL=0 : disables read-only unsuccessful updates in linked lists (pugh, lazy, copy) 
      		  and hash tables (pug, lazy, copy, lea:java)
    * (STATS not implemented on all data structures yet)
      STATS=1 : enable extra stats (about retries)
            2 : enable stats for per-thread completed ops
	    3 : enable both 1 and 2
    * PAD=1 : enabled node padding. NB. not all data structures support this properly for now
    * SEQ_NO_FREE=1 : make the SEQ implementations NOT use the ssmem_free (but uses SSMEM)
Example:
	make VERSION=DEBUG GC=0