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<lindig>
I'm looking for some help with Oasis in the context of optionally compiling with or without a bisect_ppx, a coverage profiler.
<lindig>
I'm looking for some help with Oasis in the context of optionally compiling with or without bisect_ppx, a coverage profiler.
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<adrien>
die google groups, die
<adrien>
s/ groups// actually
<adrien>
crappy walled gardens
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<lindig>
Any Oasis experts around?
<companion_cube>
what's the issue?
<lindig>
I'm looking for some help with Oasis in the context of optionally compiling with or without bisect_ppx, a coverage profiler.
<companion_cube>
ouch
<lindig>
So: I say BuildDepends: bisect_ppx and get profiling.
<companion_cube>
I'm not sure, but: if flag(bisect) BuildDepends+: bisect_ppx
<lindig>
I want this to become optional. In the best case I'd get an --enable-coverage switch
<lindig>
I tried something similar and got the message that you can't if/then/else BuildDeps
<lindig>
The Bisect GitHub page suggests something in myocamlbuild and using an env variable to enable it. I think this is too indirect and obscure. I'd prefer a switch - after all, this is the problem Oasis wants to solve.
<lindig>
But can try again the switch
<companion_cube>
erf
<companion_cube>
I had the same problem with the list of modules, once
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<lindig>
not even sure what the syntax would look like; have this (bit is wrong)
<lindig>
oais compiles it but I get error during configure
<companion_cube>
:/
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<lindig>
I don't understand why BuildDepends cannot be optional
<companion_cube>
I think it's because some `oasis setup`-time things are generated based on it
<companion_cube>
for instance, the META file probably depends on it
<companion_cube>
at `configure --enable-foo` time, the META file is already generated
<lindig>
I forgot that oasis generates code and osais is not expected to be around when I say configure
<companion_cube>
exactly
<companion_cube>
that might not be the best design decision though :/
<companion_cube>
I mean, it limits the flexibility
<lindig>
Yes. I'd think that moving these kind of things in an out is exactly what a configure script is supposed to do.
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<companion_cube>
but then people don't want to depend on oasis
<companion_cube>
+some
<lindig>
I can see that. I didn't see the point of Oasis for a while and was happy with Make + OCamlBuild. But it is convenient to use.
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<Algebr>
I don't see a way to get a Lwt file_descriptor from a Lwt channel
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<adrien>
(I take it you're aware of the risks involved in mixing both channel and direct use of a file descriptor)
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<Algebr>
No, go on
<Enjolras>
channels are buffered. But if you flush before writing it is ok. For input channels that is not that easy. Also i wonder what happens if a channel is GC but not the fdf. I'm not sure the close flag is shared
<Enjolras>
you coud always wrap it in a struct and create the channel with of_fd and access the d when you want to
<Algebr>
I see, I am starting with a channel, not from fd
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<adrien>
well, you really must not mix operations without synchronizing in between
<Algebr>
What if separate parts of the program use fd and others use channels, that should be fine right
<adrien>
well
<adrien>
a channel is really not much more than Buffer.t + file_descr
<adrien>
and when you write to a channel, it first goes in the buffer and after some time, it goes through the file_descr
<mrvn>
adrien: if it's a different fd
<mrvn>
Algebr: ^^^
<adrien>
so an issue could be that you have data in the buffer and then use the file descriptor directly and you end up with the data in the buffer being written after what you've sent through the fd directly
<Algebr>
damnit, I want more performance but I don't want to refactor a lot of this code, damnit Lwt_io should provide a unsafe_to_fd function
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<adrien>
mrvn: what do you mean?
<adrien>
Algebr: also, it is quite likely that the file descriptor uses some specific flags which might be surprising to you (since it's for lwt)
<mrvn>
if one part of the program uses the fd and the other the channel without sync then you loose
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<mrvn>
but if the channels are all using different FDs then nobody cares
<adrien>
ah, ok, you were answering to the "what if" question
<mrvn>
yep
<Algebr>
adrien: looking through lwt_io source and not seeing a fast path to the actual file descriptor itself
<Enjolras>
I hardly belive Lwt_channel make things less performant
<Algebr>
its a lot of bit shuffling
<Enjolras>
memcpy is crazy fast
<Enjolras>
you can pass a buffer, does it work with 0 size buffer ?
<adrien>
I would be more worried about reallocations than memory copies
<adrien>
so a 0-length buffer sounds like a good first thing to try
<Enjolras>
adrien: which reallocation ? If you mean cost of channel creation, you can pass a buffer
<adrien>
(but also: profiling!)
<Enjolras>
and keep a buffer pool
<adrien>
Enjolras: if buffer is dynamically-sized
<adrien>
(afk)
<Enjolras>
but yeah : profiling. I would be really amazed if you manage to come with a workload whenre lwt io is in the top functions of a profiling trace
<Enjolras>
adrien: are you sure ? i've never seen a trace where a gc is triggered from lwt_io either
<Algebr>
yea, I wanted to add that profile graph thing that talex had
<Algebr>
what else can I use to profile this code
<Enjolras>
If it is running on linux, you can use perf
<Enjolras>
perf record --call-graph dwarf gives very good insight of performance bottlenecks
<Algebr>
this is for a daemon
<Enjolras>
how is it an problem ?
<Enjolras>
You can pass -p <pid> and ctrl-c when you want to stop recording
<Algebr>
oh its not, great!
<Enjolras>
Algebr: i personnaly find perf report -G --no-children is the best presentation for the results
<Enjolras>
(by default it won't show the call-graph, -G is inverted call-graph, and --no-children sorts the functionsby the time spent in the function itself, not the function and the callees)
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<Algebr>
awesome thanks!
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<Algebr>
The following should work right: __attribute(constructor)__foo(){ caml_start(); some_caml_func();}
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<seliopou>
Drup i prefer this :D
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<Algebr>
making a larger default buffer size for lwt_io should be of some benefit too right
<mrvn>
under linux doing IO in 16-64k chunks seems best
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<mfp>
is there any set implementation around with a sub-linear cardinal op?
<adrien>
Enjolras: "if" ;-)
<adrien>
Enjolras: I don't know but sometimes the buffers are dynamically-sized; only a possibility
<adrien>
Algebr: "it depends"
<mfp>
adrien: IIRC the buffer (a Lwt_bytes.t) is allocated at channel creation time and its size does not change (you can also pass the buffer directly)
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<adrien>
ok :)
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<mfp>
uh ENOTFOUND :-( the closest I got is BatISet (integer sets will do), but cardinal is only efficient if you have ranges
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<Drup>
mfp: aren't regular Set with fast count ?
<Drup>
hum, no, that's not the one
<mfp>
Drup: (missing a word or two?) regular Set's cardinal is O(n)
<Enjolras>
Only mutables datastructures have size fields in stdlib
<Enjolras>
(except Stack)
<mfp>
thought batteries or containers would have it, but...
<companion_cube>
hmm, in containers there is a "weight balanced tree" module, with O(1) access to the weight
<companion_cube>
if the weight of every node is 1, it coincides with the cardinal
<mfp>
sounds good :)
<mfp>
CCWBTree, right?
<companion_cube>
yes
<companion_cube>
the alternative is to use a thin wrapper around Set
<mfp>
how would that work? (I want to split the set and get the cardinal of one of the subsets...)
<companion_cube>
oh
<companion_cube>
indeed, in that case you can't escape annotating each subnode
<companion_cube>
CCWBTree might be the answer
<mfp>
yes, it seems to have everything I need: logarithmic add, split, and better than O(n) cardinal (= weight) :)
<Algebr>
companion_cube: I love containers because /data is so digestable
<companion_cube>
mfp: you can use a custom weight if you prefer
<companion_cube>
Algebr: yay! :D
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<orbitz>
Anyone seen merlin compalin with "Error: Unbound value .()" for "Sys.argv.(1)"?
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<def`>
orbitz: 4.03.0? Merlin doesn't support 4.03, early support in current git
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<orbitz>
yeah just foudn it out
<orbitz>
tahnks
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