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Update mux documentation

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Rodrigo Arias 2023-02-27 12:02:25 +01:00 committed by Rodrigo Arias Mallo
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commit b08e148cbe
4 changed files with 798 additions and 178 deletions
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doc/dev/mux.md
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@ -18,30 +18,38 @@ selected. This allows a multiplexer to act as a filter too.
## Tracking
The typical use of multiplexers is to implement the tracking modes of channels.
As an example, the following diagram shows three multiplexers used to implement
As an example, the following diagram shows two multiplexers used to implement
the subsystem view of [Nanos6](../nanos6):
![Patch bay](fig/mux.svg)
![Mux example](fig/mux.svg)
The first mux0 uses the thread state channel to filter the value of the
subsystem channel and only pass it to the output when the thread is in the
Running state (green). Then the filtered subsystem channel is connected to an
input of a second mux (mux1) which selects the current input of the thread
running in the CPU0. The output *nanos6.cpu.subsystem.run* is then connected to
the Paraver timeline in the row corresponding to the CPU0, which shows the
subsystem of the currently running thread.
The first mux0 selects the input corresponding to the thread running in that
CPU (thread0), and forwards the value to the output. If no thread is running the
output is set to null. The output channel *nanos6.cpu0.subsystem.run* is then
connected to the Paraver timeline in the row corresponding to the CPU0, which
shows the subsystem of the currently **running** thread.
The Nanos6 subsystem channel is also connected to the mux2, which forwards the
value to the output only when the thread state is Active. The output is directly
connected to the Paraver row assigned to that thread. This channels shows the
subsystem of the thread by only when is active (not paused nor dead). You can
see that the subsystem is shown in the thread0 at the current time (red dotted
line) when in the CPU0 the subsystem has been hidden when the thread stops being
in the Running state (yellow).
The Nanos6 subsystem channel is also connected to the second mux1, which forwards the
value to the output only when the thread state is **Active** (not paused or
dead). The output is directly connected to the Paraver row assigned to that
thread. This view shows the subsystem of the thread when is active.
![Mux example](fig/mux1.svg)
Notice that when the thread0 is no longer Running (switches to the Cooling
state shown in yellow) the CPU subsystem timeline no longer shows the subsystem,
as the mux0 is not selecting any input (because there are no threads in the CPU0
in the Running state at that moment).
However, the thread view still shows the subsystem, as the thread0 is still
active (not paused yet). The mux1 is still selecting the thread subsystem
channel as input.
## Separation of concerns
Multiplexers allow models to interact with each other in a controlled way. In
the example, the blue channel (*nanos6.thread0.subsystem*) is directly modified by
the Nanos6 model when a new event is received. While the red channels are
controled by the ovni model. The rest of the channels are automatically updated
controlled by the ovni model. The rest of the channels are automatically updated
in the propagation phase of the [bay](../patchbay) allowing the ovni model to
modify the Nanos6 Paraver view of the subsystems.