added disk buffer instrumentation and log parser

parse_disk_buffer_log.py

@@ -0,0 +1,73 @@
+#!/bin/python
+
+import os, sys, time
+
+#lines = open(sys.argv[1], 'rb').readlines()
+#
+## logfile format:
+## <time(ms)> <key>: <value>
+## example:
+## 16434 read cache: 17
+#
+#keys = []
+#fields = {}
+#maximum = {}
+#out = open('disk_buffer_log.dat', 'w+')
+#
+#last_t = 0
+#for l in lines:
+#	try:
+#		t = int(l[0:l.find(' ')])
+#		c = l[l.find(' ')+1:l.find(':')]
+#		n = int(l[l.find(':')+1:-1])
+#	except:
+#		print l
+#		continue
+#
+#	if last_t != t:
+#		print >>out, '%d\t' % last_t,
+#		for i in keys:
+#			print >>out, '%d\t' % maximum[i],
+#		print >>out, '\n',
+#
+#	if not c in keys:
+#		keys.append(c)
+#		fields[c] = 0
+#		maximum[c] = 0
+#
+#	fields[c] = n
+#	if n > maximum[c]: maximum[c] = n
+#
+#	if last_t != t:
+#		last_t = t
+#		maximum = fields
+#
+#for i in keys:
+#	print i,
+#print
+#	
+#out.close()
+
+keys = ['check piece', 'send buffer', 'read cache', 'receive buffer', 'hash temp']
+
+out = open('disk_buffer.gnuplot', 'wb')
+print >>out, "set term png size 1200,700"
+print >>out, 'set output "disk_buffer.png"'
+print >>out, 'set xrange [0:*]'
+print >>out, 'set xlabel "time (ms)"'
+print >>out, 'set ylabel "buffers"'
+print >>out, "set style data lines"
+print >>out, "set key box"
+print >>out, 'plot',
+count = 1 + len(keys)
+keys.reverse()
+for k in keys:
+	expr = "$%d" % count
+	for i in xrange(2, count): expr += "+$%d" % i
+	print >>out, ' "disk_buffer_log.dat" using 1:(%s) title "%s" with filledcurves x1,' % (expr, k),
+	count -= 1
+print >>out, 'x=0'
+out.close()
+
+os.system('gnuplot disk_buffer.gnuplot')
+