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doc/manual/faq: more minor details
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sbourdeauducq committed Mar 25, 2015
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23 changes: 11 additions & 12 deletions doc/manual/faq.rst
Expand Up @@ -4,7 +4,7 @@ FAQ
How do I ...
============

override the `sysclk` frequency of just one dds?
override the `sysclk` frequency of just one DDS?
------------------------------------------------

Override the parameter using an argument in the DDB.
Expand All @@ -18,15 +18,14 @@ Names need to be unique.
enforce functional dependencies between parameters?
---------------------------------------------------

If you want to override a parameter `b` in the PDB to be `b = 2*a`,
If you want to override a parameter ``b`` in the PDB to be ``b = 2*a``,
use wrapper experiments, overriding parameters by passing them to the
experiment's constructor.

get rid of `DBKeys`?
--------------------
get rid of ``DBKeys``?
----------------------

`DBKeys` enforces valid parameter/argument names, references
keys in PDB and hints at metadata on how values can be retrieved.
``DBKeys`` references keys in PDB, DDB and RDB.

write a generator feeding a kernel feeding an analyze function?
---------------------------------------------------------------
Expand All @@ -49,24 +48,24 @@ write a generator feeding a kernel feeding an analyze function?
def do(self, i):
return i

create and use variable lengths arrays?
------------------------------------------------
create and use variable lengths arrays in kernels?
--------------------------------------------------

Don't. Preallocate everything. Or chunk it and e.g. read 100 events per
function call, push them upstream and retry until the gate time closes.

execute multiple slow controller RPCs in parallel without losing time?
----------------------------------------------------------------------

Use `threading.Thread`: portable, fast, simple for one-shot calls.
Use ``threading.Thread``: portable, fast, simple for one-shot calls.

write part of my experiment as a coroutine/asyncio task/generator?
------------------------------------------------------------------

You can not change the API that your experiment exposes: `__init__()`,
`build()`, `run()` and `analyze()` need to be regular functions, not
You can not change the API that your experiment exposes: ``__init__()``,
``build()``, ``run()`` and ``analyze()`` need to be regular functions, not
generators or asyncio coroutines. That would make reusing your own code in
sub-experiments difficult and fragile. You can however always use the
scheduler API to achieve the same (`scheduler.yield(duration=0)`)
scheduler API to achieve the same (``scheduler.yield(duration=0)``)
or wrap your own generators/coroutines/tasks in regular functions that
you then expose as part of the API.

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