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import os, sys
def detectCPUs():
"""
Detects the number of CPUs on a system. Cribbed from pp.
"""
# Linux, Unix and MacOS:
if hasattr(os, "sysconf"):
if os.sysconf_names.has_key("SC_NPROCESSORS_ONLN"):
# Linux & Unix:
ncpus = os.sysconf("SC_NPROCESSORS_ONLN")
if isinstance(ncpus, int) and ncpus > 0:
return ncpus
else: # OSX:
return int(capture(['sysctl', '-n', 'hw.ncpu']))
# Windows:
if os.environ.has_key("NUMBER_OF_PROCESSORS"):
ncpus = int(os.environ["NUMBER_OF_PROCESSORS"])
if ncpus > 0:
return ncpus
return 1 # Default
def mkdir_p(path):
"""mkdir_p(path) - Make the "path" directory, if it does not exist; this
will also make directories for any missing parent directories."""
import errno
if not path or os.path.exists(path):
return
parent = os.path.dirname(path)
if parent != path:
mkdir_p(parent)
try:
os.mkdir(path)
except OSError:
e = sys.exc_info()[1]
# Ignore EEXIST, which may occur during a race condition.
if e.errno != errno.EEXIST:
raise
def capture(args, env=None):
import subprocess
"""capture(command) - Run the given command (or argv list) in a shell and
return the standard output."""
p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
env=env)
out,_ = p.communicate()
return out
def which(command, paths = None):
"""which(command, [paths]) - Look up the given command in the paths string
(or the PATH environment variable, if unspecified)."""
if paths is None:
paths = os.environ.get('PATH','')
# Check for absolute match first.
if os.path.isfile(command):
return command
# Would be nice if Python had a lib function for this.
if not paths:
paths = os.defpath
# Get suffixes to search.
# On Cygwin, 'PATHEXT' may exist but it should not be used.
if os.pathsep == ';':
pathext = os.environ.get('PATHEXT', '').split(';')
else:
pathext = ['']
# Search the paths...
for path in paths.split(os.pathsep):
for ext in pathext:
p = os.path.join(path, command + ext)
if os.path.exists(p):
return p
return None
def checkToolsPath(dir, tools):
for tool in tools:
if not os.path.exists(os.path.join(dir, tool)):
return False;
return True;
def whichTools(tools, paths):
for path in paths.split(os.pathsep):
if checkToolsPath(path, tools):
return path
return None
def printHistogram(items, title = 'Items'):
import itertools, math
items.sort(key = lambda item: item[1])
maxValue = max([v for _,v in items])
# Select first "nice" bar height that produces more than 10 bars.
power = int(math.ceil(math.log(maxValue, 10)))
for inc in itertools.cycle((5, 2, 2.5, 1)):
barH = inc * 10**power
N = int(math.ceil(maxValue / barH))
if N > 10:
break
elif inc == 1:
power -= 1
histo = [set() for i in range(N)]
for name,v in items:
bin = min(int(N * v/maxValue), N-1)
histo[bin].add(name)
barW = 40
hr = '-' * (barW + 34)
print('\nSlowest %s:' % title)
print(hr)
for name,value in items[-20:]:
print('%.2fs: %s' % (value, name))
print('\n%s Times:' % title)
print(hr)
pDigits = int(math.ceil(math.log(maxValue, 10)))
pfDigits = max(0, 3-pDigits)
if pfDigits:
pDigits += pfDigits + 1
cDigits = int(math.ceil(math.log(len(items), 10)))
print("[%s] :: [%s] :: [%s]" % ('Range'.center((pDigits+1)*2 + 3),
'Percentage'.center(barW),
'Count'.center(cDigits*2 + 1)))
print(hr)
for i,row in enumerate(histo):
pct = float(len(row)) / len(items)
w = int(barW * pct)
print("[%*.*fs,%*.*fs) :: [%s%s] :: [%*d/%*d]" % (
pDigits, pfDigits, i*barH, pDigits, pfDigits, (i+1)*barH,
'*'*w, ' '*(barW-w), cDigits, len(row), cDigits, len(items)))
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