| import random, time | |
| f = open('/dev/sda', 'rb') | |
| L = 1000 ** 4 * 2 | |
| bs = 4096 | |
| while bs <= 1024 * 1024 * 128: | |
| count = 0 | |
| start = time.time() | |
| while time.time() - start < 30: | |
| f.seek(random.randrange(0, L, bs), 0) | |
| f.read(bs) | |
| count += 1 | |
| took = time.time() - start | |
| size = bs * count | |
| print 'bs=%dk' % (bs / 1024), 'read=%d' % count, 'size=%.1f MB' % (size / 1024**2), 'speed=%.1f MB/s' % (size / took / 1024**2) | |
| bs *= 2 |
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