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#!/usr/bin/env python
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# encoding: utf-8
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"""
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The IPython engine application
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Authors:
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* Brian Granger
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* MinRK
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import json
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import os
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import sys
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import time
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import zmq
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from zmq.eventloop import ioloop
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from IPython.core.profiledir import ProfileDir
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from IPython.parallel.apps.baseapp import (
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BaseParallelApplication,
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base_aliases,
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base_flags,
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catch_config_error,
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)
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from IPython.zmq.log import EnginePUBHandler
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from IPython.zmq.session import (
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Session, session_aliases, session_flags
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)
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from IPython.config.configurable import Configurable
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from IPython.parallel.engine.engine import EngineFactory
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from IPython.parallel.engine.streamkernel import Kernel
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from IPython.parallel.util import disambiguate_url, asbytes
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from IPython.utils.importstring import import_item
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from IPython.utils.traitlets import Bool, Unicode, Dict, List, Float
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#-----------------------------------------------------------------------------
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# Module level variables
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#-----------------------------------------------------------------------------
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#: The default config file name for this application
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default_config_file_name = u'ipengine_config.py'
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_description = """Start an IPython engine for parallel computing.
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IPython engines run in parallel and perform computations on behalf of a client
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and controller. A controller needs to be started before the engines. The
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engine can be configured using command line options or using a cluster
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directory. Cluster directories contain config, log and security files and are
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usually located in your ipython directory and named as "profile_name".
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See the `profile` and `profile-dir` options for details.
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"""
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_examples = """
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ipengine --ip=192.168.0.1 --port=1000 # connect to hub at ip and port
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ipengine --log-to-file --log-level=DEBUG # log to a file with DEBUG verbosity
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"""
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#-----------------------------------------------------------------------------
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# MPI configuration
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#-----------------------------------------------------------------------------
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mpi4py_init = """from mpi4py import MPI as mpi
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mpi.size = mpi.COMM_WORLD.Get_size()
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mpi.rank = mpi.COMM_WORLD.Get_rank()
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"""
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pytrilinos_init = """from PyTrilinos import Epetra
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class SimpleStruct:
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pass
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mpi = SimpleStruct()
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mpi.rank = 0
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mpi.size = 0
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"""
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class MPI(Configurable):
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"""Configurable for MPI initialization"""
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use = Unicode('', config=True,
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help='How to enable MPI (mpi4py, pytrilinos, or empty string to disable).'
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)
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def _use_changed(self, name, old, new):
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# load default init script if it's not set
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if not self.init_script:
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self.init_script = self.default_inits.get(new, '')
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init_script = Unicode('', config=True,
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help="Initialization code for MPI")
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default_inits = Dict({'mpi4py' : mpi4py_init, 'pytrilinos':pytrilinos_init},
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config=True)
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#-----------------------------------------------------------------------------
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# Main application
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#-----------------------------------------------------------------------------
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aliases = dict(
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file = 'IPEngineApp.url_file',
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c = 'IPEngineApp.startup_command',
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s = 'IPEngineApp.startup_script',
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url = 'EngineFactory.url',
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ssh = 'EngineFactory.sshserver',
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sshkey = 'EngineFactory.sshkey',
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ip = 'EngineFactory.ip',
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transport = 'EngineFactory.transport',
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port = 'EngineFactory.regport',
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location = 'EngineFactory.location',
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timeout = 'EngineFactory.timeout',
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mpi = 'MPI.use',
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)
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aliases.update(base_aliases)
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aliases.update(session_aliases)
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flags = {}
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flags.update(base_flags)
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flags.update(session_flags)
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class IPEngineApp(BaseParallelApplication):
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name = 'ipengine'
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description = _description
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examples = _examples
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config_file_name = Unicode(default_config_file_name)
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classes = List([ProfileDir, Session, EngineFactory, Kernel, MPI])
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startup_script = Unicode(u'', config=True,
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help='specify a script to be run at startup')
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startup_command = Unicode('', config=True,
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help='specify a command to be run at startup')
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url_file = Unicode(u'', config=True,
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help="""The full location of the file containing the connection information for
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the controller. If this is not given, the file must be in the
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security directory of the cluster directory. This location is
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resolved using the `profile` or `profile_dir` options.""",
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)
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wait_for_url_file = Float(5, config=True,
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help="""The maximum number of seconds to wait for url_file to exist.
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This is useful for batch-systems and shared-filesystems where the
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controller and engine are started at the same time and it
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may take a moment for the controller to write the connector files.""")
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url_file_name = Unicode(u'ipcontroller-engine.json', config=True)
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def _cluster_id_changed(self, name, old, new):
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if new:
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base = 'ipcontroller-%s' % new
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else:
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base = 'ipcontroller'
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self.url_file_name = "%s-engine.json" % base
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log_url = Unicode('', config=True,
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help="""The URL for the iploggerapp instance, for forwarding
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logging to a central location.""")
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aliases = Dict(aliases)
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flags = Dict(flags)
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def find_url_file(self):
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"""Set the url file.
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Here we don't try to actually see if it exists for is valid as that
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is hadled by the connection logic.
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"""
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config = self.config
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# Find the actual controller key file
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if not self.url_file:
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self.url_file = os.path.join(
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self.profile_dir.security_dir,
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self.url_file_name
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)
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def load_connector_file(self):
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"""load config from a JSON connector file,
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at a *lower* priority than command-line/config files.
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"""
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self.log.info("Loading url_file %r", self.url_file)
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config = self.config
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with open(self.url_file) as f:
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d = json.loads(f.read())
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if 'exec_key' in d:
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config.Session.key = asbytes(d['exec_key'])
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try:
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config.EngineFactory.location
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except AttributeError:
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config.EngineFactory.location = d['location']
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d['url'] = disambiguate_url(d['url'], config.EngineFactory.location)
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try:
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config.EngineFactory.url
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except AttributeError:
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config.EngineFactory.url = d['url']
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try:
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config.EngineFactory.sshserver
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except AttributeError:
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config.EngineFactory.sshserver = d['ssh']
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def init_engine(self):
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# This is the working dir by now.
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sys.path.insert(0, '')
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config = self.config
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# print config
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self.find_url_file()
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# was the url manually specified?
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keys = set(self.config.EngineFactory.keys())
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keys = keys.union(set(self.config.RegistrationFactory.keys()))
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if keys.intersection(set(['ip', 'url', 'port'])):
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# Connection info was specified, don't wait for the file
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url_specified = True
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self.wait_for_url_file = 0
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else:
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url_specified = False
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if self.wait_for_url_file and not os.path.exists(self.url_file):
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self.log.warn("url_file %r not found", self.url_file)
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self.log.warn("Waiting up to %.1f seconds for it to arrive.", self.wait_for_url_file)
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tic = time.time()
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while not os.path.exists(self.url_file) and (time.time()-tic < self.wait_for_url_file):
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# wait for url_file to exist, or until time limit
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time.sleep(0.1)
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if os.path.exists(self.url_file):
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self.load_connector_file()
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elif not url_specified:
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self.log.fatal("Fatal: url file never arrived: %s", self.url_file)
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self.exit(1)
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try:
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exec_lines = config.Kernel.exec_lines
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except AttributeError:
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config.Kernel.exec_lines = []
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exec_lines = config.Kernel.exec_lines
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if self.startup_script:
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enc = sys.getfilesystemencoding() or 'utf8'
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cmd="execfile(%r)" % self.startup_script.encode(enc)
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exec_lines.append(cmd)
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if self.startup_command:
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exec_lines.append(self.startup_command)
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# Create the underlying shell class and Engine
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# shell_class = import_item(self.master_config.Global.shell_class)
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# print self.config
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try:
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self.engine = EngineFactory(config=config, log=self.log)
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except:
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self.log.error("Couldn't start the Engine", exc_info=True)
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self.exit(1)
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def forward_logging(self):
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if self.log_url:
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self.log.info("Forwarding logging to %s", self.log_url)
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context = self.engine.context
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lsock = context.socket(zmq.PUB)
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lsock.connect(self.log_url)
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self.log.removeHandler(self._log_handler)
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handler = EnginePUBHandler(self.engine, lsock)
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handler.setLevel(self.log_level)
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self.log.addHandler(handler)
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self._log_handler = handler
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def init_mpi(self):
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global mpi
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self.mpi = MPI(config=self.config)
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mpi_import_statement = self.mpi.init_script
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if mpi_import_statement:
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try:
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self.log.info("Initializing MPI:")
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self.log.info(mpi_import_statement)
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exec mpi_import_statement in globals()
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except:
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mpi = None
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else:
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mpi = None
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@catch_config_error
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def initialize(self, argv=None):
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super(IPEngineApp, self).initialize(argv)
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self.init_mpi()
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self.init_engine()
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self.forward_logging()
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def start(self):
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self.engine.start()
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try:
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self.engine.loop.start()
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except KeyboardInterrupt:
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self.log.critical("Engine Interrupted, shutting down...\n")
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def launch_new_instance():
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"""Create and run the IPython engine"""
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app = IPEngineApp.instance()
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app.initialize()
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app.start()
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if __name__ == '__main__':
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launch_new_instance()
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