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Joey Hess 2012-01-28 22:50:28 -04:00
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23
doc/todo/multi-thread_ikiwiki.mdwn
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@ -64,3 +64,26 @@ Disclaimer: I know nothing of the Perl approach to parallel processing.
>>> I'm not really sure what the best solution is. Me, I profile my IkiWiki builds and try to tweak performance for them... but there's only so much I can do. >>> I'm not really sure what the best solution is. Me, I profile my IkiWiki builds and try to tweak performance for them... but there's only so much I can do.
>>> --[[KathrynAndersen]] >>> --[[KathrynAndersen]]
>>>> IMHO, the best way to get a multithreaded ikiwiki is to rewrite it
>>>> in haskell, using as much pure code as possible. Many avenues
>>>> then would open up to taking advantage of haskell's ability to
>>>> parallize pure code.
>>>>
>>>> With that said, we already have some nice invariants that could be
>>>> used to parallelize page builds. In particular, we know that
>>>> page A never needs state built up while building page B, for any
>>>> pages A and B that don't have a dependency relationship -- and ikiwiki
>>>> tracks such dependency relationships, although not currently in a form
>>>> that makes it very easy (or fast..) to pick out such groups of
>>>> unrelated pages.
>>>>
>>>> OTOH, there are problems.. building page A can result in changes to
>>>> ikiwiki's state; building page B can result in other changes. All
>>>> such changes would have to be made thread-safely. And would the
>>>> resulting lock contention result in a program that ran any faster
>>>> once parallelized?
>>>>
>>>> Which is why [[rewrite_ikiwiki_in_haskell]], while pretty insane, is
>>>> something I keep thinking about. If only I had a spare year..
>>>> --[[Joey]]

6
doc/todo/rewrite_ikiwiki_in_haskell.mdwn
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@ -62,8 +62,4 @@ Some other things to be scared about:
a bunch of haskell libraries. OTOH, it might be possible to build a a bunch of haskell libraries. OTOH, it might be possible to build a
static binary at home and upload it, thus avoiding a messy installation static binary at home and upload it, thus avoiding a messy installation
procedure entirely. procedure entirely.
* I can barely code in haskell yet. I'm probably about 100x faster at --[[Joey]]
programming in perl. I need to get some more practical experience before
I´m fast and seasoned enough in haskell to attempt such a project.
(And so far, progress at learning has been slow and I have not managed
to write anything serious in haskell.) --[[Joey]]