/usr/bin/bsp_virtual is in python-scientific 2.9.4-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Run BSP code using threads to emulate processors
#
# Written by Konrad Hinsen <hinsen@cnrs-orleans.fr>
# last revision: 2009-1-26
#
import code, getopt
import ihooks, imp, pdb, traceback
import threading
import copy, os, operator, sys, time, types
from StringIO import StringIO
import Scientific.BSP
debug = 0
#
# Forced termination exception
#
class ForcedTermination(Exception):
pass
#
# The virtual parallel machine
#
class VirtualBSPMachine:
def __init__(self, nproc, show_runtime=0):
pids = range(nproc)
self.nproc = nproc
self.show_runtime = runtime
self.current_pid = 0
self.debugger = None
self.name_spaces = [{'__name__': '__main__'} for pid in pids]
self.mailbox = [[] for pid in pids]
self.runtime = [0. for pid in pids]
self.output = [None for pid in pids]
self.exception = [None for pid in pids]
self.condition = threading.Condition()
self.active_thread = -1
def currentPid(self):
return self.current_pid
def numberOfProcessors(self):
return nproc
def isExtendedName(self, name):
return name[:2] == '_P' and name[7] == '_'
def extendedName(self, name, pid = None):
if pid is None:
pid = self.current_pid
return ("_P%05d_" % pid) + name
def baseName(self, name):
if self.isExtendedName(name):
return name[8:]
else:
return name
def virtualProcessor(self, pid):
if debug: print "*** Starting processor", pid
self.condition.acquire()
while self.active_thread != pid:
self.condition.wait()
self.condition.release()
self.exception[pid] = None
if self.debugger is not None:
if self.current_pid in self.debugged_pids:
print "*** Debugging pid", self.current_pid
self.debugger.reset()
sys.settrace(self.debugger.trace_dispatch)
else:
print "*** Not debugging pid", self.current_pid
try:
exec self.code in self.name_spaces[pid]
except:
self.exception[pid] = sys.exc_info()
self.showtraceback()
if self.debugger is not None:
sys.settrace(None)
self.terminated[pid] = True
self.condition.acquire()
self.active_thread = -1
self.condition.notifyAll()
self.condition.release()
def run(self, code, buffered_output = 0):
self.code = code
pids = range(self.nproc)
self.done = False
self.terminated = [False for pid in pids]
self.active_thread = -1
for pid in pids:
if buffered_output:
self.output[pid] = StringIO()
thread = threading.Thread(name = 'Processor %d' % pid,
target = lambda p=pid:
self.virtualProcessor(p))
thread.start()
super_step = 0
real_stdout = sys.stdout
real_stderr = sys.stderr
while 1:
if debug: print "*** Superstep ", super_step
for self.current_pid in pids:
if debug: print "*** Running ", self.current_pid
if buffered_output:
sys.stdout = self.output[self.current_pid]
sys.stderr = self.output[self.current_pid]
self.condition.acquire()
self.active_thread = self.current_pid
start_time = time.time()
self.condition.notifyAll()
while self.active_thread != -1:
self.condition.wait()
self.condition.release()
sys.settrace(None)
self.runtime[self.current_pid] += time.time()-start_time
if buffered_output:
sys.stdout = real_stdout
sys.stderr = real_stderr
if debug: print "*** ", self.current_pid, " at barrier"
if debug: print "*** End of superstep ", super_step
self.messages = self.mailbox
self.mailbox = [[] for pid in pids]
super_step += 1
self.done = reduce(operator.or_, self.terminated)
if self.done:
if debug:
print "*** End of execution "
for pid in pids:
if not self.terminated[pid]:
print "*** Processor %d still running" % pid
break
if self.show_runtime:
print "Runtimes:"
for pid in range(nproc):
print " Processor %d: %f s" % (pid, self.runtime[pid])
def showtraceback(self):
try:
type, value, tb = sys.exc_info()
sys.last_type = type
sys.last_value = value
sys.last_traceback = tb
tblist = traceback.extract_tb(tb)
del tblist[:1]
list = traceback.format_list(tblist)
if list:
list.insert(0, "Traceback (most recent call last):\n")
list[len(list):] = traceback.format_exception_only(type, value)
finally:
tblist = tb = None
map(sys.stderr.write, list)
def run_debug(self, command, debugger, pids):
self.debugger = debugger
self.debugged_pids = pids
self.run(command, 0)
self.debugger = None
def put(self, object, pid_list):
if self.debugger:
sys.settrace(None)
for pid in pid_list:
self.mailbox[pid].append(copy.deepcopy(object))
def send(self, messages):
if self.debugger:
sys.settrace(None)
for pid, data in messages:
self.put(data, [pid])
def sync(self):
if self.debugger:
sys.settrace(None)
pid = self.current_pid
if debug: print "--- ", pid, " at sync"
self.condition.acquire()
self.active_thread = -1
self.condition.notifyAll()
while self.active_thread != pid:
self.condition.wait()
self.condition.release()
if self.done:
if debug: print "--- ", pid, " terminated"
raise ForcedTermination
if debug: print "--- ", pid, " continuing after sync"
if self.debugger is not None:
if self.current_pid in self.debugged_pids:
print "*** Debugging pid", self.current_pid
self.debugger.reset()
sys.settrace(self.debugger.trace_dispatch)
else:
print "*** Not debugging pid", self.current_pid
return self.messages[pid]
#
# Change module imports such that every virtual processor gets its
# own copy of all modules except for builtin modules.
#
class Hooks(ihooks.Hooks):
def is_builtin(self, name):
return imp.is_builtin(machine.baseName(name))
def init_builtin(self, name):
return imp.init_builtin(machine.baseName(name))
def is_frozen(self, name):
return imp.is_frozen(machine.baseName(name))
def init_frozen(self, name):
return imp.init_frozen(machine.baseName(name))
def get_frozen_object(self, name):
return imp.get_frozen_object(machine.baseName(name))
def load_dynamic(self, name, filename, file=None):
return imp.load_dynamic(machine.baseName(name), filename, file)
class ModuleLoader(ihooks.ModuleLoader):
def find_module_in_dir(self, name, dir, allow_packages=1):
if dir is None:
return self.find_builtin_module(name)
name = machine.baseName(name)
return ihooks.ModuleLoader.find_module_in_dir(self, name, dir,
allow_packages)
class ModuleImporter(ihooks.ModuleImporter):
def __init__(self, loader = None):
ihooks.ModuleImporter.__init__(self, loader)
for name in self.modules.keys():
if not (machine.isExtendedName(name)
or name == "Scientific"
or name[:11] == "Scientific."):
for pid in range(machine.nproc):
self.modules[machine.extendedName(name, pid)] = \
self.modules[name]
def import_module(self, name, globals=None, locals=None, fromlist=None):
name = machine.extendedName(name)
return ihooks.ModuleImporter.import_module(self, name,
globals, locals, fromlist)
def import_it(self, partname, fqname, parent, force_load=0):
if not partname:
raise ValueError("Empty module name")
if not force_load:
try:
return self.modules[fqname]
except KeyError:
pass
try:
path = parent and parent.__path__
except AttributeError:
return None
stuff = self.loader.find_module(partname, path)
if not stuff:
return None
m = self.loader.load_module(fqname, stuff)
if parent:
setattr(parent, machine.baseName(partname), m)
return m
def find_head_package(self, parent, name):
if '.' in name:
i = name.find('.')
head = name[:i]
tail = name[i+1:]
else:
head = name
tail = ""
if parent:
qname = "%s.%s" % (parent.__name__, machine.baseName(head))
else:
qname = head
q = self.import_it(head, qname, parent)
if q: return q, tail
if parent:
qname = head
parent = None
q = self.import_it(head, qname, parent)
if q: return q, tail
raise ImportError("No module named " + qname)
#
# An interactive parallel console
#
class VirtualConsole(code.InteractiveConsole):
def __init__(self, virtual_machine):
code.InteractiveConsole.__init__(self)
self.virtual_machine = virtual_machine
def runcode(self, compiled_code):
try:
self.virtual_machine.run(compiled_code, 1)
self.showOutput()
except SystemExit:
raise
except:
self.showOutput()
self.virtual_machine.showtraceback()
else:
if code.softspace(sys.stdout, 0):
print
def showOutput(self):
for pid in range(self.virtual_machine.numberOfProcessors()):
output = self.virtual_machine.output[pid].getvalue()
if output:
sys.stdout.write(("-- Processor %d " % pid) + 40*'-' + '\n')
sys.stdout.write(output)
def push(self, line):
if line and line[0] == '!':
command = line.strip()[1:]
exec command in {'pm': self.pdb_pm, 'run': self.pdb_run}
return 0
return code.InteractiveConsole.push(self, line)
def pdb_pm(self, pid):
pdb.post_mortem(self.virtual_machine.exception[pid][-1])
def pdb_run(self, pids, command):
try:
command = compile(command, '<string>', 'exec')
except SyntaxError:
self.showsyntaxerror()
return
if type(pids) == type(0):
pids = [pids]
debugger = pdb.Pdb()
self.virtual_machine.run_debug(command, debugger, pids)
debugger.quitting = 1
sys.settrace(None)
options, args = getopt.getopt(sys.argv[1:], 'in:t')
interactive = False
runtime = False
nproc = 1
for option, value in options:
if option == '-i':
interactive = True
if option == '-t':
runtime = True
if option == '-n':
nproc = int(value)
if len(args) < 2:
interactive = True
machine = VirtualBSPMachine(nproc, runtime)
sys.virtual_bsp_machine = machine
hooks = Hooks()
loader = ModuleLoader(hooks)
importer = ModuleImporter(loader)
sys.setrecursionlimit((nproc+1)*1000)
importer.install()
cprt = 'Type "copyright", "credits" or "license" for more information.'
banner = "Python %s on %s\n%s\n(Parallel console, %d processors)" % \
(sys.version, sys.platform, cprt, nproc)
if len(args) > 1:
script_name = args[1]
script = file(script_name).read()
compiled_code = compile(script, script_name, 'exec')
machine.run(compiled_code)
banner = ''
if interactive:
console = VirtualConsole(machine)
console.interact(banner)
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