Added comparison gen tool

Author: dramninjasUMD

comparison_gen.py

@@ -0,0 +1,71 @@
+#!/usr/bin/python 
+"""
+
+This script generates a series of commands to do parameter sweeps. One way to
+use this script is to generate a big matrix of configurations and then run them
+on different binaries to diff the output.  This can be used as a poor man's
+regression test when doing code cleanups (i.e. where functionality is not
+supposed to change as a result of a commit.
+
+Or, if you just set a single binary and comment out the diff stuff at the
+bottom, it is just a convenient way to do parameter sweeps. 
+
+Since this uses the command line overrides (-o flag), it needs a fairly recent
+commit of DRAMSim2
+( see: https://github.com/dramninjasUMD/DRAMSim2/commit/e46f525bd274a0b3312002dce3efe83c769ea2ce )
+
+Just redirect the output of this command to a file and then run it in bash. 
+
+"""
+
+import itertools 
+
+parameters = {'QUEUING_STRUCTURE': ['per_rank', 'per_rank_per_bank'],
+					'ROW_BUFFER_POLICY': ['open_page', 'close_page'],
+					'SCHEDULING_POLICY': ['rank_then_bank_round_robin','bank_then_rank_round_robin']
+					}
+
+devices = ['DDR3_micron_64M_8B_x4_sg15.ini', 'DDR2_micron_32M_4B_x4_sg3E.ini'];
+
+traces = ['k6_bsc_vector1.trc', 'k6_video_tracking_128kL2_trace.trc',  'k6_aoe_02_short.trc']
+binaries = ['DRAMSim.master', 'DRAMSim.cleanup']
+
+dramsim_flags = '-c 2000000 -n -S 8192 -q '
+
+# get the parameter permutations
+
+master_list = []
+for k,v in parameters.iteritems():
+#	print v
+	master_list.append(v)
+	
+paramOverrideList=[]
+for i in itertools.product(*master_list):
+	tmp=[]
+	for j,param in enumerate(i):
+		tmp.append("%s=%s"%(parameters.keys()[j],param))
+	paramOverrideList.append(",".join(tmp))
+#print paramOverrideList
+
+print "#!/bin/bash"
+print "rm DRAMSim.*.vis"
+i=0
+for trace in traces: 
+	for device in devices:
+		for paramOverrides in paramOverrideList:
+			for executable in binaries:
+				output_file = "%s_%d"%(executable, i)
+				print "./%s -s system.ini -d ini/%s -t traces/%s -o %s %s -v %s &"%(executable, device, trace, paramOverrides, dramsim_flags, output_file)
+			i+=1
+
+print "echo -n waiting"
+print "wait"
+print "echo OK"
+print "echo Starting diff phase"
+for x in range(i):
+	diff_args="%s_%d.vis %s_%d.vis"%(binaries[0],x,binaries[1],x)
+	print "echo %s_%d.vis and %s_%d.vis:"%(binaries[0],x,binaries[1],x)
+	print "is_different=`diff -q %s`"%(diff_args)
+	print "if [ -n \"$is_different\" ] ; then"	
+	print "diff -u %s"%(diff_args); 
+	print "fi"