replaced disk_access.gnuplot with a proper parsing script

disk_access.gnuplot

@@ -1,7 +0,0 @@
-set term png size 1200,700
-set output "disk_access.png"
-set xrange [0:*]
-set xlabel "time (ms)"
-set ylabel "disk offset"
-set key box
-plot  "disk_access.log" using 1:3 title "disk access locations" with steps

parse_disk_access.py

@@ -0,0 +1,82 @@
+#!/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 = ['read', 'write', 'head movement', 'read', 'write']
+colors = ['30f030', 'f03030', '3030f0', '10a010', 'a01010']
+style = ['points pointsize 1', 'points pointsize 2', 'lines', 'lines', 'lines']
+axis = ['x1y1', 'x1y1', 'x1y2', 'x1y2', 'x1y2']
+
+out = open('disk_access_log.dat', 'w+')
+
+time = 5000
+
+last_pos = 0
+last_t = 0
+cur_movement = 0
+cur_read = 0
+cur_write = 0
+
+for l in lines:
+	try:
+		# strip newline
+		l = l[0:-1].split(' ')
+		t = int(l[0])
+		k = l[1]
+		n = int(l[2])
+	except:
+		print l
+		continue
+
+	read = '-'
+	write = '-'
+	movement = '-'
+	amount_read = '-'
+	amount_write = '-'
+	if k == 'read': read = '%d' % n
+	if k == 'write': write = '%d' % n
+	if k == 'read_end': cur_read += n - last_pos
+	if k == 'write_end': cur_write += n - last_pos
+
+	cur_movement += abs(last_pos - n)
+	last_pos = n
+
+	if last_t + time <= t:
+		movement = '%d' % cur_movement
+		amount_read = '%d' % cur_read
+		amount_write = '%d' % cur_write
+		cur_movement = 0
+		cur_read = 0
+		cur_write = 0
+		last_t = t
+
+	print >>out, '%d\t%s\t%s\t%s\t%s\t%s' % (t, read, write, movement, amount_read, amount_write)
+
+out.close()
+
+out = open('disk_access.gnuplot', 'wb')
+print >>out, "set term png size 1200,700"
+print >>out, 'set output "disk_access.png"'
+print >>out, 'set xrange [0:*]'
+print >>out, 'set xlabel "time (ms)"'
+print >>out, 'set ylabel "file position"'
+print >>out, 'set y2label "bytes / %d second(s)"' % (time / 1000)
+print >>out, "set key box"
+print >>out, 'plot',
+count = 1
+for k in keys:
+	count += 1
+	print >>out, ' "disk_access_log.dat" using 1:%d title "%s" with %s lt rgb "#%s" axis %s,' \
+		% (count, k, style[count-2], colors[count-2], axis[count-2]),
+print >>out, 'x=0'
+out.close()
+
+os.system('gnuplot disk_access.gnuplot')
+