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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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``%result``
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{RESULT_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, magics_class, line_magic, line_cell_magic
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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_ACTIVE_VIEW = "Use activate() on a DirectView object to use it with magics."
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@magics_class
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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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# 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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active_view = None
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@skip_doctest
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@line_magic
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def result(self, parameter_s=''):
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"""Print the result of command i on all engines.
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To use this a :class:`DirectView` instance must be created
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and then activated by calling its :meth:`activate` method.
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This lets you recall the results of %px computations after
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asynchronous submission (view.block=False).
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Then you can do the following::
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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]: %result
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[ 8] Out[10]: 60920
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[ 9] Out[10]: 60921
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[10] Out[10]: 60922
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[11] Out[10]: 60923
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"""
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if self.active_view is None:
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raise UsageError(NO_ACTIVE_VIEW)
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stride = len(self.active_view)
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try:
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index = int(parameter_s)
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except:
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index = -1
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msg_ids = self.active_view.history[stride * index:(stride * (index + 1)) or None]
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result = self.active_view.get_result(msg_ids)
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result.get()
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result.display_outputs()
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@skip_doctest
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@line_cell_magic
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def px(self, line='', cell=None):
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"""Executes the given python command in parallel.
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To use this a :class:`DirectView` instance must be created
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and then activated by calling its :meth:`activate` method.
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Then you can do the following::
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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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if self.active_view is None:
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raise UsageError(NO_ACTIVE_VIEW)
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# defaults:
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block = self.active_view.block
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groupby = 'type'
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if cell is None:
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# line magic
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cell = line
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else:
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# as a cell magic, we accept args
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opts, _ = self.parse_options(line, 'oe', 'group-outputs=', 'block', 'noblock')
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if 'group-outputs' in opts:
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groupby = opts['group-outputs']
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elif 'o' in opts:
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groupby = 'order'
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elif 'e' in opts:
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groupby = 'engine'
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if 'block' in opts:
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block = True
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elif 'noblock' in opts:
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block = False
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base = "Parallel" if self.active_view.block else "Async parallel"
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print base + " execution on engine(s): %s" % self.active_view.targets
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result = self.active_view.execute(cell, silent=False, block=False)
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if block:
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result.get()
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result.display_outputs(groupby)
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@skip_doctest
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@line_magic
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def autopx(self, parameter_s=''):
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"""Toggles auto parallel mode.
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To use this a :class:`DirectView` instance must be created
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and then activated by calling its :meth:`activate` method. Once this
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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
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are used, set the ``targets`` attributed of the multiengine client
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before 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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if self.active_view is None:
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raise UsageError(NO_ACTIVE_VIEW)
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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.active_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.active_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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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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)
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_loaded = False
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def load_ipython_extension(ip):
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"""Load the extension in IPython."""
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global _loaded
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if not _loaded:
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ip.register_magics(ParallelMagics)
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_loaded = True
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