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exampleutils.py
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exampleutils.py
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import numpy as np
import time
import re
import subprocess
class RandomDataGenerator(object):
"""
A file-like object which generates random data.
1. Never actually keeps all the data in memory so
can be used to generate huge files.
2. Actually generates random data to eliminate
false metrics based on compression.
It does this by generating data in 1MB blocks
from np.random where each block is seeded with
the block number.
"""
def __init__(self, bytes_total):
self.bytes_total = bytes_total
self.pos = 0
self.current_block_id = None
self.current_block_data = ""
self.BLOCK_SIZE_BYTES = 1024*1024
self.block_random = np.random.randint(0, 256, dtype=np.uint8,
size=self.BLOCK_SIZE_BYTES)
def tell(self):
print "tell", self.pos
return self.pos
def seek(self, pos, whence=0):
print "seek","pos=", pos, "whence=", whence
if whence == 0:
self.pos = pos
elif whence == 1:
self.pos += pos
elif whence == 2:
self.pos = self.bytes_total - pos
def get_block(self, block_id):
if block_id == self.current_block_id:
return self.current_block_data
self.current_block_id = block_id
self.current_block_data = (block_id + self.block_random).tostring()
return self.current_block_data
def get_block_coords(self, abs_pos):
block_id = abs_pos // self.BLOCK_SIZE_BYTES
within_block_pos = abs_pos - block_id * self.BLOCK_SIZE_BYTES
return block_id, within_block_pos
def read(self, bytes_requested):
remaining_bytes = self.bytes_total - self.pos
if remaining_bytes == 0:
return ""
bytes_out = min(remaining_bytes, bytes_requested)
start_pos = self.pos
byte_data = ""
byte_pos = 0
while byte_pos < bytes_out:
abs_pos = start_pos + byte_pos
bytes_remaining = bytes_out - byte_pos
block_id, within_block_pos = self.get_block_coords(abs_pos)
block = self.get_block(block_id)
# how many bytes can we copy?
chunk = block[within_block_pos:within_block_pos + bytes_remaining]
byte_data += chunk
byte_pos += len(chunk)
self.pos += bytes_out
return byte_data
NTP_SERVERS = ['time.mit.edu',
'ntp1.net.berkeley.edu',
'ntp2.net.berkeley.edu']
def get_time_offset(server, attempts=1):
"""
Returns a list of offsets for a particular server
"""
import ntplib
c = ntplib.NTPClient()
res = []
for i in range(attempts):
try:
r = c.request(server, version=3)
offset = r.offset
delay = r.delay
res.append(offset)
except ntplib.NTPException:
pass
return res
def parse_ifconfig_hwaddr(s):
a = re.search(r'.+?(HWaddr\s+(?P<hardware_address>\S+))', s, re.MULTILINE).groupdict('')
return a['hardware_address']
def parse_ifconfig_inetaddr(s):
return re.findall(r'.+?inet addr:(?P<inet_addr>[\d.]+)', s, re.MULTILINE)
def get_hwaddr():
ifconfig_data = subprocess.check_output("/sbin/ifconfig")
hwaddr = parse_ifconfig_hwaddr(ifconfig_data)
return hwaddr
def get_ifconfig():
ifconfig_data = subprocess.check_output("/sbin/ifconfig")
hwaddr = parse_ifconfig_hwaddr(ifconfig_data)
inet_addr = parse_ifconfig_inetaddr(ifconfig_data)
return hwaddr, inet_addr
def get_uptime():
uptime_str = open("/proc/uptime").read().strip()
up_str, idle_str = uptime_str.split()
return float(up_str), float(idle_str)
def dict_to_sdb_attr(d, replace=False):
"""
create an attributes list from a dictionar
"""
return [{'Name' : str(k),
'Value' : str(v),
'Replace' : replace} for k, v in d.iteritems()]
def sdb_attr_to_dict(attrs):
return {a['Name'] : a['Value'] for a in attrs}
if __name__ == "__main__":
"""
basic benchmark of data generation
"""
rdg = RandomDataGenerator(1024*1024*1024)
read_size = 8192
read_count = 10000000
bytes_read = 0
t1 = time.time()
for r in range(read_count):
a = rdg.read(read_size)
bytes_read += len(a)
t2 = time.time()
print t2-t1
print bytes_read / (t2-t1)/1e6, "MB/sec"