サンプルプログラム集
提供: Wikinote
C
Python
memcurses.py
curses (libcurses) を利用した /proc/meminfo の変化量を表示するスクリプト。
ソースコード <toggledisplay>
#!/usr/bin/env python
import sys, time, curses
def main(argv):
win = curses.initscr()
if len(argv) > 1:
interval = int(argv[1])
else:
interval = 1
f = open("/proc/meminfo", "r")
prev = []
while True:
win.clear()
win.addstr(0, 0, "Every %d.0s : %s" % (interval, time.ctime()))
i = 0
try:
for line in f:
win.addstr(i+2, 0, line[:-1])
cur = line.split()[1]
try:
if cur != prev[i]:
win.addstr(" %+d" % (int(cur) - int(prev[i])))
prev[i] = cur
except IndexError:
prev.append(cur)
i += 1
win.addstr("\n")
win.refresh()
f.seek(0)
time.sleep(interval)
except KeyboardInterrupt:
break
curses.endwin()
f.close()
return 0
if __name__ == "__main__":
sys.exit(main(sys.argv))
</toggledisplay>
実行例 <toggledisplay>
$ ./memcurses.py 5 Every 5.0s : Sat Feb 26 01:06:31 2011 MemTotal: 5968984 kB MemFree: 458472 kB Buffers: 292224 kB +8 Cached: 4135716 kB SwapCached: 0 kB Active: 2248520 kB +44 Inactive: 2798728 kB HighTotal: 5241152 kB HighFree: 449732 kB LowTotal: 727832 kB LowFree: 8740 kB SwapTotal: 6144852 kB SwapFree: 6144716 kB Dirty: 456 kB Writeback: 0 kB AnonPages: 619336 kB +32 Mapped: 1179140 kB +112 Slab: 111936 kB -44 PageTables: 12296 kB +52 NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 9129344 kB Committed_AS: 1629408 kB VmallocTotal: 116728 kB VmallocUsed: 19364 kB VmallocChunk: 97136 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB
</toggledisplay>
calc_buddy.py
/proc/buddyinfo のそれぞれのゾーンの合計サイズを計算するスクリプト。 タイムスタンプを付けて記録したファイルにも対応。
ソースコード <toggledisplay>
#!/usr/bin/env python
import sys
if len(sys.argv) == 1:
files = [ open('/proc/buddyinfo', 'r') ]
ts_shift = 4;
else:
files = [ open(f) for f in sys.argv[1:] ]
ts_shift = 6;
for file in files:
for line in file:
if len(line) > 1:
print line[:-1],
fields = line.split()
total = 0
for val in range(0,11):
total += int(fields[ts_shift + val]) * 4 * 2**val
print total, "KB"
else:
print line,
file.close()
</toggledisplay>
実行例 <toggledisplay>
$ ./calc_buddy.py Node 0, zone DMA 46 5 3 0 0 0 0 1 1 1 0 3856 KB Node 0, zone Normal 327 2 1 1 1 1 1 0 0 0 1 5916 KB Node 0, zone HighMem 78051 15607 279 2 59 17 2 0 0 0 0 448052 KB
</toggledisplay>
dec2bin.py
10 進数を 2 進数に変換するスクリプト。32 ビット限定。
ソースコード <toggledisplay>
#!/usr/bin/env python
import sys
def dec2bin(dec):
ret = ""
for i in range(31, -1, -1):
if dec & (1 << i):
ret += "1"
elif ret:
ret += "0"
return ret
if __name__ == "__main__":
if len(sys.argv) < 2:
print "Usage: %s dec" % sys.argv[0]
sys.exit(1)
try:
print dec2bin(int(sys.argv[1]))
except ValueError:
print "Invalid number"
sys.exit(1)
</toggledisplay>
実行例 <toggledisplay>
$ ./dec2bin.py 12345 11000000111001 $ ./dec2bin.py 1024 10000000000 $ ./dec2bin.py -65536 11111111111111110000000000000000 $ ./dec2bin.py 2147483647 1111111111111111111111111111111 $ ./dec2bin.py -2147483648 10000000000000000000000000000000
</toggledisplay>
