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Added architecture picture for map_reduce
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‎src/doc/en/reference/combinat/media/map_reduce_arch.fig

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#FIG 3.2 Produced by xfig version 3.2.5c
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4 0 0 50 -1 2 14 0.0000 0 210 1005 5850 4500 main loop\001
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4 0 0 50 -1 2 14 0.0000 0 165 960 3600 6030 Steal Ans\001
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4 0 0 50 -1 2 14 0.0000 0 165 960 8550 6030 Steal Ans\001
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4 0 0 50 -1 2 14 0.0000 0 210 975 12060 5490 Steal Req\001
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4 0 0 50 -1 2 20 0.0000 0 225 1020 4500 900 Master\001
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‎src/doc/en/reference/combinat/media/map_reduce_arch.pdf

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‎src/doc/en/reference/combinat/media/map_reduce_arch.png

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‎src/sage/combinat/map_reduce.py

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@@ -207,6 +207,13 @@
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- ``worker._thief`` -- a :class:`Thread` which is in charge of stealing from
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``worker._todo``.
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Here is a schematic of the architecture:
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.. _figure-map_reduce_arch:
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.. figure:: ../../media/map_reduce_arch.png
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How thefts are performed
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------------------------
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- ``W`` signals to the master that it is idle :meth:`master._signal_task_done`;
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- ``W`` chose a victim ``V`` at random;
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- ``W`` sends a request to ``V`` : it puts its identifier into ``V._request``;
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- ``W`` tries to read a node from ``W._read_task``. Then three things can happen:
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- ``W`` tries to read a node from ``W._read_task``. Then three things may happen:
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+ a proper node is read. Then the theft was a success and ``W`` starts
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working locally on the received node.
@@ -235,13 +242,24 @@
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shutdown.
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We now describe the protocol on the victims side. Each worker process contains
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a :class:`Thread` which acts like some kinds of Troyan horse during theft. It
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is normally blocked waiting for a steal request.
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From the point of view of ``V` here is what happens:
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a :class:`Thread` which we call ``T`` for thief which acts like some kinds of
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Troyan horse during theft. It is normally blocked waiting for a steal request.
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From the point of view of ``V`` and ``T``, here is what happens:
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- during normal time ``T`` is blocked waiting on ``V._request``;
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- upon steal request, ``T`` wakes up receiving the identification of ``W``;
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- ``T`` signal to the master that a new task is starting by
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:meth:`master._signal_task_start`;
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- Two things may happen depending if the queue ``V._todo`` is empty or not.
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Remark that due to the GIL, there is no parallel execution between the
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victim ``V`` and its thief tread ``T``.
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+ If ``V._todo`` is empty, then ``None`` is answered on
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``W._write_task``. The task is immediately signaled to end the the master
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through :meth:`master._signal_task_done`.
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+ Otherwise, a node is removed from the bottom of ``V._todo``. The node is
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sent to ``W`` on ``W._write_task``. The task will be ended by ``W``.
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Are there examples of classes ?
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-------------------------------
@@ -304,7 +322,7 @@ def proc_number(max_proc = None):
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INPUT:
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- `max_proc` -- the maximum number of process used
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- ``max_proc`` -- the maximum number of process used
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EXAMPLE::
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@@ -346,14 +364,13 @@ class RESetMapReduce(object):
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Description of the set:
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- either ``forest=f`` -- where ``f`` is a :class:`RecursivelyEnumeratedSet`
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- ``roots`` -- = None,
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children = None,
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post_process = None,
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map_function = None,
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reduce_function = None,
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reduce_init = None,
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forest = None
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- ``roots`` -- (default to ``None``),
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- ``children` -- (default to ``None``),
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- ``post_process`` -- (default to ``None``),
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- ``map_function`` -- (default to ``None``),
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- ``reduce_function`` -- (default to ``None``),
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- ``reduce_init`` -- (default to ``None``),
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- ``forest`` -- (default to ``None``)
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"""
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def __init__(self, roots = None,
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children = None,

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