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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(os.popen2("sysctl -n hw.ncpu")[1].read())
# 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:
# Ignore EEXIST, which may occur during a race condition.
if e.errno != errno.EEXIST:
raise
def capture(args):
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)
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.exists(command):
return command
# Would be nice if Python had a lib function for this.
if not paths:
paths = os.defpath
# Get suffixes to search.
pathext = os.environ.get('PATHEXT', '').split(os.pathsep)
# 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 printHistogram(items, title = 'Items'):
import itertools, math
items.sort(key = lambda (_,v): v)
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)" % (pDigits, pfDigits, i*barH,
pDigits, pfDigits, (i+1)*barH),
print ":: [%s%s] :: [%*d/%*d]" % ('*'*w, ' '*(barW-w),
cDigits, len(row),
cDigits, len(items))
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