added an option to generate a disk io log file

parse_disk_log.py

@@ -0,0 +1,68 @@
+import os, sys, time
+
+lines = open(sys.argv[1], 'rb').readlines()
+
+time_limit = -1
+if len(sys.argv) > 2:
+	time_limit = long(sys.argv[2])
+
+keys = ['write', 'read', 'hash', 'move', 'release', 'idle']
+
+# logfile format:
+# <time(ms)> <state>
+# example:
+# 34523 idle
+# 34722 write
+
+quantization = 5000
+
+out = open('disk_io.dat', 'wb')
+state = 'idle'
+time = 0
+i = 0
+state_timer = {}
+for k in keys: state_timer[k] = 0
+for l in lines:
+	l = l[:-1].split(' ')
+	if len(l) < 2:
+		print l
+		continue
+	try:
+		new_time = long(l[0])
+		while new_time > i + quantization:
+			i += quantization
+			state_timer[state] += i - time
+			time = i
+			for k in keys: print >>out, state_timer[k],
+			print >>out
+			for k in keys: state_timer[k] = 0
+		state_timer[state] += new_time - time
+		time = new_time
+		state = l[1]
+	except:
+		print l
+out.close()
+
+
+out = open('disk_io.gnuplot', 'wb')
+print >>out, "set term png size 1200,700"
+print >>out, 'set output "disk_io.png"'
+print >>out, 'set xrange [0:*]'
+print >>out, 'set ylabel "time (ms)"'
+print >>out, "set style data lines"
+print >>out, 'set title "disk io utilization per %s second(s)"' % (quantization / 1000)
+print >>out, "set key box"
+print >>out, "set style data histogram"
+print >>out, "set style histogram rowstacked"
+print >>out, "set style fill solid"
+print >>out, 'plot',
+i = 0
+for k in keys:
+	if k != 'idle':
+		print >>out, ' "disk_io.dat" using %d title "%s",' % (i + 1, keys[i]),
+	i = i + 1
+print >>out, 'x=0'
+out.close()
+
+os.system('gnuplot disk_io.gnuplot');
+