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# encoding: utf-8
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"""
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=============
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parallelmagic
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=============
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Magic command interface for interactive parallel work.
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Usage
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=====
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``%autopx``
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{AUTOPX_DOC}
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``%px``
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{PX_DOC}
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``%pxresult``
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{RESULT_DOC}
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``%pxconfig``
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{CONFIG_DOC}
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008 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 ast
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import re
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from IPython.core.error import UsageError
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from IPython.core.magic import Magics
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from IPython.core import magic_arguments
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from IPython.testing.skipdoctest import skip_doctest
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#-----------------------------------------------------------------------------
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# Definitions of magic functions for use with IPython
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#-----------------------------------------------------------------------------
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NO_LAST_RESULT = "%pxresult recalls last %px result, which has not yet been used."
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def exec_args(f):
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"""decorator for adding block/targets args for execution
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applied to %pxconfig and %%px
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"""
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args = [
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magic_arguments.argument('-b', '--block', action="store_const",
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const=True, dest='block',
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help="use blocking (sync) execution",
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),
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magic_arguments.argument('-a', '--noblock', action="store_const",
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const=False, dest='block',
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help="use non-blocking (async) execution",
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),
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magic_arguments.argument('-t', '--targets', type=str,
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help="specify the targets on which to execute",
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),
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magic_arguments.argument('--local', action="store_const",
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const=True, dest="local",
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help="also execute the cell in the local namespace",
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),
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magic_arguments.argument('--verbose', action="store_const",
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const=True, dest="set_verbose",
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help="print a message at each execution",
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),
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magic_arguments.argument('--no-verbose', action="store_const",
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const=False, dest="set_verbose",
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help="don't print any messages",
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),
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]
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for a in args:
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f = a(f)
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return f
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def output_args(f):
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"""decorator for output-formatting args
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applied to %pxresult and %%px
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"""
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args = [
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magic_arguments.argument('-r', action="store_const", dest='groupby',
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const='order',
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help="collate outputs in order (same as group-outputs=order)"
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),
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magic_arguments.argument('-e', action="store_const", dest='groupby',
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const='engine',
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help="group outputs by engine (same as group-outputs=engine)"
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),
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magic_arguments.argument('--group-outputs', dest='groupby', type=str,
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choices=['engine', 'order', 'type'], default='type',
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help="""Group the outputs in a particular way.
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Choices are:
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type: group outputs of all engines by type (stdout, stderr, displaypub, etc.).
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engine: display all output for each engine together.
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order: like type, but individual displaypub output from each engine is collated.
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For example, if multiple plots are generated by each engine, the first
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figure of each engine will be displayed, then the second of each, etc.
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"""
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),
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magic_arguments.argument('-o', '--out', dest='save_name', type=str,
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help="""store the AsyncResult object for this computation
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in the global namespace under this name.
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"""
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),
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]
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for a in args:
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f = a(f)
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return f
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class ParallelMagics(Magics):
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"""A set of magics useful when controlling a parallel IPython cluster.
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"""
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# magic-related
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magics = None
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registered = True
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# suffix for magics
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suffix = ''
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# A flag showing if autopx is activated or not
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_autopx = False
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# the current view used by the magics:
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view = None
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# last result cache for %pxresult
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last_result = None
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# verbose flag
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verbose = False
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def __init__(self, shell, view, suffix=''):
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self.view = view
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self.suffix = suffix
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# register magics
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self.magics = dict(cell={},line={})
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line_magics = self.magics['line']
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px = 'px' + suffix
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if not suffix:
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# keep %result for legacy compatibility
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line_magics['result'] = self.result
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line_magics['pxresult' + suffix] = self.result
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line_magics[px] = self.px
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line_magics['pxconfig' + suffix] = self.pxconfig
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line_magics['auto' + px] = self.autopx
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self.magics['cell'][px] = self.cell_px
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super(ParallelMagics, self).__init__(shell=shell)
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def _eval_target_str(self, ts):
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if ':' in ts:
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targets = eval("self.view.client.ids[%s]" % ts)
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elif 'all' in ts:
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targets = 'all'
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else:
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targets = eval(ts)
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return targets
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@magic_arguments.magic_arguments()
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@exec_args
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def pxconfig(self, line):
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"""configure default targets/blocking for %px magics"""
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args = magic_arguments.parse_argstring(self.pxconfig, line)
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if args.targets:
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self.view.targets = self._eval_target_str(args.targets)
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if args.block is not None:
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self.view.block = args.block
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if args.set_verbose is not None:
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self.verbose = args.set_verbose
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@magic_arguments.magic_arguments()
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@output_args
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@skip_doctest
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def result(self, line=''):
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"""Print the result of the last asynchronous %px command.
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This lets you recall the results of %px computations after
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asynchronous submission (block=False).
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Examples
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--------
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::
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In [23]: %px os.getpid()
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Async parallel execution on engine(s): all
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In [24]: %pxresult
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Out[8:10]: 60920
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Out[9:10]: 60921
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Out[10:10]: 60922
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Out[11:10]: 60923
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"""
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args = magic_arguments.parse_argstring(self.result, line)
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if self.last_result is None:
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raise UsageError(NO_LAST_RESULT)
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self.last_result.get()
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self.last_result.display_outputs(groupby=args.groupby)
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@skip_doctest
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def px(self, line=''):
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"""Executes the given python command in parallel.
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Examples
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--------
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::
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In [24]: %px a = os.getpid()
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Parallel execution on engine(s): all
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In [25]: %px print a
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[stdout:0] 1234
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[stdout:1] 1235
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[stdout:2] 1236
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[stdout:3] 1237
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"""
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return self.parallel_execute(line)
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def parallel_execute(self, cell, block=None, groupby='type', save_name=None):
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"""implementation used by %px and %%parallel"""
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# defaults:
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block = self.view.block if block is None else block
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base = "Parallel" if block else "Async parallel"
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targets = self.view.targets
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if isinstance(targets, list) and len(targets) > 10:
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str_targets = str(targets[:4])[:-1] + ', ..., ' + str(targets[-4:])[1:]
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else:
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str_targets = str(targets)
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if self.verbose:
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print base + " execution on engine(s): %s" % str_targets
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result = self.view.execute(cell, silent=False, block=False)
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self.last_result = result
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if save_name:
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self.shell.user_ns[save_name] = result
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if block:
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result.get()
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result.display_outputs(groupby)
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else:
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# return AsyncResult only on non-blocking submission
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return result
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@magic_arguments.magic_arguments()
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@exec_args
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@output_args
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@skip_doctest
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def cell_px(self, line='', cell=None):
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"""Executes the cell in parallel.
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Examples
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--------
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::
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In [24]: %%px --noblock
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....: a = os.getpid()
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Async parallel execution on engine(s): all
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In [25]: %%px
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....: print a
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[stdout:0] 1234
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[stdout:1] 1235
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[stdout:2] 1236
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[stdout:3] 1237
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"""
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args = magic_arguments.parse_argstring(self.cell_px, line)
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if args.targets:
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save_targets = self.view.targets
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self.view.targets = self._eval_target_str(args.targets)
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# if running local, don't block until after local has run
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block = False if args.local else args.block
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try:
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ar = self.parallel_execute(cell, block=block,
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groupby=args.groupby,
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save_name=args.save_name,
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)
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finally:
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if args.targets:
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self.view.targets = save_targets
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# run locally after submitting remote
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if args.local:
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self.shell.run_cell(cell)
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# now apply blocking behavor to remote execution
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block = self.view.block if args.block is None else args.block
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if block:
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ar.get()
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ar.display_outputs(groupby)
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return ar
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@skip_doctest
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def autopx(self, line=''):
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"""Toggles auto parallel mode.
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Once this is called, all commands typed at the command line are send to
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the engines to be executed in parallel. To control which engine are
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used, the ``targets`` attribute of the view before
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entering ``%autopx`` mode.
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Then you can do the following::
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In [25]: %autopx
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%autopx to enabled
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In [26]: a = 10
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Parallel execution on engine(s): [0,1,2,3]
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In [27]: print a
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Parallel execution on engine(s): [0,1,2,3]
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[stdout:0] 10
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[stdout:1] 10
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[stdout:2] 10
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[stdout:3] 10
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In [27]: %autopx
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%autopx disabled
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"""
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if self._autopx:
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self._disable_autopx()
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else:
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self._enable_autopx()
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def _enable_autopx(self):
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"""Enable %autopx mode by saving the original run_cell and installing
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pxrun_cell.
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"""
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# override run_cell
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self._original_run_cell = self.shell.run_cell
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self.shell.run_cell = self.pxrun_cell
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self._autopx = True
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print "%autopx enabled"
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def _disable_autopx(self):
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"""Disable %autopx by restoring the original InteractiveShell.run_cell.
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"""
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if self._autopx:
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self.shell.run_cell = self._original_run_cell
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self._autopx = False
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print "%autopx disabled"
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def pxrun_cell(self, raw_cell, store_history=False, silent=False):
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"""drop-in replacement for InteractiveShell.run_cell.
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This executes code remotely, instead of in the local namespace.
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See InteractiveShell.run_cell for details.
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"""
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if (not raw_cell) or raw_cell.isspace():
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return
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ipself = self.shell
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with ipself.builtin_trap:
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cell = ipself.prefilter_manager.prefilter_lines(raw_cell)
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# Store raw and processed history
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if store_history:
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ipself.history_manager.store_inputs(ipself.execution_count,
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cell, raw_cell)
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# ipself.logger.log(cell, raw_cell)
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cell_name = ipself.compile.cache(cell, ipself.execution_count)
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try:
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ast.parse(cell, filename=cell_name)
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except (OverflowError, SyntaxError, ValueError, TypeError,
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MemoryError):
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# Case 1
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ipself.showsyntaxerror()
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ipself.execution_count += 1
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return None
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except NameError:
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# ignore name errors, because we don't know the remote keys
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pass
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if store_history:
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# Write output to the database. Does nothing unless
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# history output logging is enabled.
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ipself.history_manager.store_output(ipself.execution_count)
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# Each cell is a *single* input, regardless of how many lines it has
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ipself.execution_count += 1
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if re.search(r'get_ipython\(\)\.magic\(u?["\']%?autopx', cell):
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self._disable_autopx()
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return False
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else:
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try:
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result = self.view.execute(cell, silent=False, block=False)
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except:
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ipself.showtraceback()
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return True
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else:
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if self.view.block:
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try:
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result.get()
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except:
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self.shell.showtraceback()
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return True
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else:
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with ipself.builtin_trap:
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result.display_outputs()
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return False
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__doc__ = __doc__.format(
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AUTOPX_DOC = ' '*8 + ParallelMagics.autopx.__doc__,
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PX_DOC = ' '*8 + ParallelMagics.px.__doc__,
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RESULT_DOC = ' '*8 + ParallelMagics.result.__doc__,
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CONFIG_DOC = ' '*8 + ParallelMagics.pxconfig.__doc__,
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)
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