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<ben_vulpes>
so i'm looking at this function, call it a method on a class, that performs an assignation without ever returning anything. does ruby return the last assignation by default?
<elomatreb>
Methods return the last evaluated expression, and an assignment returns the assigned value (the RHS)
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<ben_vulpes>
elomatreb: neat, thanks
<ben_vulpes>
linter probably bitching pointlessly
<elomatreb>
What's the error/warning?
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<ben_vulpes>
`assigned but unused variable`
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<elomatreb>
Oh, you're assingning to a local variable (not an instance var)?
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<ben_vulpes>
apparently
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<ben_vulpes>
local vars aren't...local to the class instance and so ergo an instance var?
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<elomatreb>
local variables (no @ in front) are local to the method
<ben_vulpes>
dare i ask if they're threadsafe?
<elomatreb>
Although setter methods (e.g. through attr_accessor) can look like assignment
<elomatreb>
I'm not really experienced with Ruby threading, sorry
<ben_vulpes>
eesh
<ben_vulpes>
well now i'm just scared
<ben_vulpes>
BUSHWHACKING ALONE THROUGH AN EMPTY FOREST OF CODE
<ben_vulpes>
alone but for the leaves my predecessors pinned to the trunks
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<ben_vulpes>
oh god okay here i go type the question into google i guess
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<ben_vulpes>
looks like lexical scope holds? except for instance vars and class vars
<ben_vulpes>
which i suppose makes sense
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<Radar>
ben_vulpes: hi.
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<agent_white>
Be brave friend. I hope your scissors are of the sharpest.
<nictrasavios>
It's the strangest error, because it does not happen if I run the commands manually via the console. It's also strange because usually putting an error into google gives me 5000 solutions, and 1-2 useful ones. But, I get almost nothing with this.
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<nictrasavios>
agent_white, any clues?
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<kotakhitam>
\q
<kotakhitam>
ah sorry.. wrong window
<kotakhitam>
exit
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<pagios>
Hello, so i have a localDatabase and a remoteDatase. Both databases are replicas and contain the same number of columns of data and rows. Now, i need to update database1 column1 and make it autoreplicate only those columns to database 2. At the same time i want to update column2 in database2 and autoreplicate the changes to column2 in database1. database1 should never update column2 it should only receive the updates and vice versa
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<Burgestrand>
pagios two things, 1) sounds like you might be in the wrong channel 2) your message looks cut off
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<catphish>
however this doesn't work, because it assumes the protocol will be AF_INET, which is not actually the case for www.google.com, is there an obvious way to resolve this?
<matthewd>
Do it the other way around?
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<catphish>
ah, i think the result of sockaddr_in contains the family
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<catphish>
it's not very obvious because it returns a string
<catphish>
but it returns "\n\x00\x00P\x00\x00\x00\x00*\x00\x14P@\t\b\x02\x00\x00\x00\x00\x00\x00 \x04\x00\x00\x00\x00"
<matthewd>
IIRC if you really care about not blocking, you need to do the DNS resolution yourself too
<catphish>
Socket::Constants::AF_INET6 == 10
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<catphish>
matthewd: that's also true
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<catphish>
though i'm not too worried about that
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<matthewd>
(at which point you'd know whether it's 4 or 6)
<catphish>
that's true i suppose
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<catphish>
nothing's ever simple :)
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<catphish>
async dns resolution in ruby is nontrivial it would seem :)
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<matthewd>
If you don't care about making it async, the source of Socket.tcp (using Addrinfo.foreach) seems relevant
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<catphish>
i'm probably going to go ahead and make an async implementation of rsolution using a DNS socket and Resolv
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<catphish>
having realised this is probably quite important
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<catphish>
thanks for the pointers
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<matthewd>
Bonus points for a gem/method that does the async stuff and produces an Addrinfo ;)
<catphish>
the async stuff will be rather propriatery to my event loop
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<nictrasavios>
May I ask questions with rails stuff in here, or is that not allowed since RubyonRails exists? I figure you guys might be better at the logic and database side of things.
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<kapouik>
hi
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<ketan>
nictrasavios: there is a #RubyOnRails channel
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<catphish>
nictrasavios: if you properly distil your question, it should become clear whether it's a language question, or a framework question, or a database question, but as a rule, just ask :)
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<rubian>
hi
<rubian>
Does somebody know what BigDecimal should return when passing an empty string? Like BigDecimal("")
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<newrubycoder>
guys when i'm looking at ruby benchmarks like "user system total real 3.960000 0.010000 3.970000 ( 3.990886)", what does the numbers mean?
<centrx>
newrubycoder: it divides up the time taken by the app itself, and the kernel/OS
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<centrx>
newrubycoder: "user" is the app, "system" is the kernel/OS/background
<centrx>
newrubycoder: "total" is user + system
<newrubycoder>
ah ok
<centrx>
newrubycoder: "real" is the actual real-world time, the other times are based on CPU timing or something (still very close)
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<newrubycoder>
what time is used? miliseconds? nanoseconds?
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<centrx>
I thought it was seconds
<newrubycoder>
yeah it might be cuz i think the benchmark does it 1000 times or something
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<centrx>
newrubycoder: "This report shows the user CPU time, system CPU time, the sum of the user and system CPU times, and the elapsed real time. The unit of time is seconds."
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<newrubycoder>
apparently the sort function is slower than sort_by
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<Zarthus>
i wouldn't worry too much about performance
<Zarthus>
if you work in a field where microoptimizations are important, ruby is the wrong language to begin with
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<newrubycoder>
but 4 seconds vs 0.65 seconds is a lot
<fuzzyhorns>
newrubycoder: missed the upthread, what're you looking at?
<fuzzyhorns>
and Zarthus i think i agree it's not micro
<fuzzyhorns>
i wish we wouldn't give up on ruby being faster
<Zarthus>
fuzzyhorns: his name is newrubycoder
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<fuzzyhorns>
Zarthus: doesn't mean he can't do math lol
<Zarthus>
fuzzyhorns: I think if you already start benchmarking as a beginner you're taking the wrong road of learning :P
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<fuzzyhorns>
Zarthus: depends. i don't agree necessarily
<Zarthus>
benchmarks in general are pretty useless
<fuzzyhorns>
i think we'll agree to disagree
<elomatreb>
sort_by isn't necessarily faster than regular sort though, it's just it often uses a cheaper comparison method (usually integers)
<toretore>
i think it's useless to be benchmarking and trying to optimize when you don't know basic ruby yet
<toretore>
newrubycoder: ^
<fuzzyhorns>
again, depends on learning style
<Zarthus>
aye, while i agree 4 seconds vs 0.6 is a good gain, it won't come down to "sort by" being faster, just that in this scenario it performs better.
<fuzzyhorns>
benchmarking merge vs merge! can lead to some good insights
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<Zarthus>
benchmarking gives the idea "this method is always faster, i should always use this"
<fuzzyhorns>
i know premature optimization is the root of all evil, but if you're just using these tools to ask "why"
<Zarthus>
it'll help, sure, but to each their own :)
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<agent_white>
Mornin' folks
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<newrubycoder>
it's more like afternoon here
<fuzzyhorns>
to me it's telling that everyone here was more interested in beating back newrubycoder's curiosity than admitting they don't really know why ruby behaves the way it does — why the large difference in performance for this test, and how you could test differently to surface the "why"
<fuzzyhorns>
for instance, in this test, i find it really Smelly that reverse is compared to reverse! — ime using a bang can often speed you up from quadratic to linear
<fuzzyhorns>
actually, looking again, the labels are wrong — both use reverse, even though one is labeled reverse!
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<newrubycoder>
matthewd: yeah i guess the info is a bit outdated i will be doing some benchmarking myself maybe when i can figure out gems and stuff
<matthewd>
The point stands, though, that the answer is actually "it depends"
<fuzzyhorns>
ruby's core benchmark doesn't average a bunch of trials for you, but GF does
<elomatreb>
Yep, they're also all run on 2.2, 2.4 speeds a few things up
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<fuzzyhorns>
fwiw, I'm still genuinely curious why sort_by behaves better than sort in this circumstances :d
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<matthewd>
fuzzyhorns: It's less operations. It's why sort_by exists.
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<fuzzyhorns>
matthewd: yah, how does it achieve that though?
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<fuzzyhorns>
is it not a comparison sort? (it lacks an explicit comparator but idk…)
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<centrx>
fuzzyhorns: handling a block has some overhead, that's part of it
<matthewd>
The slow part -- the invocation of the block -- occurs N times for sort_by, along with an array allocation. For sort, it occurs however many times the sort algorithm needs to compare two elements.
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<fuzzyhorns>
matthewd: yeah how does it achieve that without memory overhead? (or does it have that?)
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<matthewd>
> along with an array allocation
<fuzzyhorns>
yah so it's not a comparison sort but doing ehh insertion sort? i follow
<matthewd>
It's still a comparison sort, but it's a comparison sort on the transformed array
<matthewd>
... so the comparisons are comparatively fast, and in common cases (like this one) don't hit user code
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<warreng_>
can somebody help me understand if the expression "@queue.empty? && @queue.num_waiting == 10" is threadsafe or if the ruby intepreter could switch to another thread between .empty? and .num_waiting (and that thread could add something to the queue)? More context - https://gist.github.com/wkonkel/bcda8bd569bd7d6b8ca8a2928159044d
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<baweaver>
assuming that's what @queue is you should be fine
<baweaver>
"The Queue class implements all the required locking semantics."
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<toretore>
specifically, `@queue.empty? && @queue.num_waiting == 10` is not thread safe in the way you describe it
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<toretore>
but it's a weird thing to be asking and you should instead provide more context
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<newrubycoder>
toretore: can i whisper you?
<toretore>
no
<toretore>
what
<toretore>
no
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<toretore>
i know it's valentine's day and all but that's weird
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<newrubycoder>
lol i didnt mean it like that
<baweaver>
XD
* baweaver
cleans up tea he spit on desk
<toretore>
if you want to ask me something you should ask in the channel
<toretore>
that way everyone can help
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<newrubycoder>
do you know any ruby books or resources in norwegian
<toretore>
no idea
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<toretore>
you should seek out english versions, they have the best quality and you seem proficient enough
<newrubycoder>
thanks
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<warreng_>
toretore: for context, i provided that gist link with a 15 line snippet... TL;DR - i'm putting a few "requests" into a Queue. each request can optionally add additional requests to the queue. and i'm creating a thread pool to work on the requests. and when the queue is empty and no workers are working, i want to kill the threads and continue code execution.
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<warreng_>
if there's a better way to use @queue, i'd be happy to change around the approach
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<toretore>
well then you have a race condition: "when the queue is empty and no workers are working" is not something you can determine at any point in time if "each request can optionally add additional requests to the queue"
<toretore>
warreng_: what makes you want to use a thread pool instead of just a thread per request?
<warreng_>
if @queue.empty? && @queue.num_waiting == 10 was threadsafe, then i could. because if there's 10 workers, and they're all waiting on the queue rather than working, and the queue is empty, then we're finished.
<warreng_>
right?
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<warreng_>
toretore: there's sometimes thousands of requests. and i want to throttle the actual HTTP connections being made
<matthewd>
warreng_: No, because the last two could both check that condition at the same time
<toretore>
ok, that's legitimate
<warreng_>
matthewd: could i use a mutex around just that check?
<toretore>
you need some form of "job" abstraction, which can be marked as finished; then "associated requests" belong to this
<warreng_>
but another thread could be in the middle of @queue.pop, so mutex doesn't help
<toretore>
that way, you know exactly how many jobs you have, and each job can be >1 req
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<warreng_>
toretore: i had that with a @number_workers_running that went up/down. but i still had race conditions in figuring out when to kill the threadpool
<toretore>
when a job determines it needs to perform another request, it can just do it, or reschedule itself back on the queue
<matthewd>
I suspect concurrent-ruby has a more closely-fitting abstraction for you
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<toretore>
you didn't read what i wrote close enough: "worker" and "job" are two different things
<matthewd>
warreng_: Can you move the check to the main thread?
<warreng_>
so two queues!?
<matthewd>
warreng_: When num_waiting == CONCURRENCY, they're all done.
<matthewd>
Thread.pass until @queue.num_waiting == CONCURRENCY; workers.each(&:kill)
<matthewd>
(instead of the join)
<warreng_>
ahhh, interesting...
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<warreng_>
does "Thread.pass until" thrash CPU when threads are idle?
<matthewd>
I'd check the implementation to be 100% sure, but I'm 99% sure that num_waiting won't get bumped unless the queue is empty... so your original thread-safety concern can just go away.
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<warreng_>
that's clever!
<matthewd>
Worth checking what it does if all the others are doing IO or something, I guess -- you could go with a sleep if you prefer
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<warreng_>
ya, a sleep 1 is no problem here. this loop can take 15 minutes sometimes, so an extra second at the end is fine :)
<warreng_>
how would i check implementation? MRI source code i assume?
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<warreng_>
sleep(1) until @queue.num_waiting == CONCURRENCY; workers.each(&:kill)
<warreng_>
^-- with a sleep, there's no need for Thread.pass, right?
<matthewd>
Right
<matthewd>
And yes, MRI source.
<warreng_>
awesome, thanks
<warreng_>
that seems like a 1-liner solution, awesome stuff
<toretore>
this assumes you have a list of uris or whatever as a starting point
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<warreng_>
toretore: that's not the case
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<toretore>
well how do you know when you're done then?
<warreng_>
i'm actually starting with 1 job, and that job creates N jobs, and each of those can create M and so on and so on
<warreng_>
it's interacting with a remote API and looping over results
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<warreng_>
so if the remote API returns 50 results in the first API call, it's 50 additional requests that need to happen
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<djellemah>
warreng_: did you look at Queue#close ?
<warreng_>
so at first, only one job runs and there's 9 idle workers still waiting on the queue
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<warreng_>
djellemah: i don't know when to close the queue, that's the problem.
<toretore>
warreng_: the whole thing revolves around figuring out what it means to be "done"
<toretore>
that's what you must focus on
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<warreng_>
toretore: done is when the queue is empty and there are no current requests
<toretore>
that's a race condition
<warreng_>
if there's even 1 request currently running, that could create 1000 new requests
<warreng_>
toretore: it's not a race condition
<toretore>
you don't know when the queue is empty
<warreng_>
the queue is often empty
<toretore>
exactly
<warreng_>
but if there is a request running, it can add stuff to the queue
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<warreng_>
assuming matthewd is correct in that num_waiting isn't updated if there's a thread waiting on pop, then @queue.num_waiting == CONCURRENCY is a very elegant solution
<warreng_>
it means "if all the threads are waiting" as in, none of them are working on a request
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<warreng_>
and if all threads are waiting, then the queue must be empty
<djellemah>
only your producer side (ie the requests) can know when all requests have been put on the queue. So you have to wait for all requests to be finished, then close the queue.
<warreng_>
matthewd: actually... i have doubts now that it will work.
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<warreng_>
if i push a bunch of stuff on to the queue, there's a possibility that the queue has stuff on it, but no threads have popped yet. in this case num_waiting will still be all the threads
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<warreng_>
the check around empty && num_threads still seems necessary (and is the whole problem)
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<matthewd>
I haven't checked the code, but I believe it'll be fine
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<matthewd>
The thread that pushed the work wasn't waiting at the time it pushed it
<matthewd>
And when it loops to the pop, there's work available, so it never goes to sleep == never touches num_waiting
<matthewd>
In pop, the thread only becomes a waiter if the queue is empty
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<jose_leeto>
hello guys, any ideias how I can execute a rails action x minutes after a models has been created in database?
<matthewd>
warreng_: The thread safety is the same as the ruby code; other threads are executing at the same time.
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<matthewd>
?rails jose_leeto
<ruby[bot]>
jose_leeto: Please join #RubyOnRails for Rails questions. You need to be identified with NickServ, see /msg NickServ HELP
<matthewd>
jose_leeto: But you probably want Active Job
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<matthewd>
warreng_: Actually, correction: the GVL prevents other threads from running while we're inside these functions.
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<warreng_>
thanks
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<djellemah>
warreng_: I think it would work better to invert the problem - treat it as a tree traversal, and use a thread pool to fetch the next n links in the tree.
<warreng_>
djellemah: the tree isn't know beforehand though
<djellemah>
doesn'
<djellemah>
t need to be.
<matthewd>
warreng_: No
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<djellemah>
you can identify a leaf - when a document has no more links, right?
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<matthewd>
warreng_: Also, `Array.new(N) do .. end` or `N.times.map do .. end` is probably clearer than 0...N, just as a side thought
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<warreng_>
matthewd: why doesn't that work? isn't CONCURERNCY-1 it equivalent to doing it in the main thread?
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<matthewd>
It has the same race we talked about before
<matthewd>
Two threads can check that condition, see that two threads are currently awake, and decide to loop & pop
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<warreng_>
but if two threads are currently awake, then num_waiting would never be -1
<warreng_>
it'd be -2
<matthewd>
Exactly
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<warreng_>
ahh.. and both would finish and the queue would never get closed
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<matthewd>
warreng_: If you're just uncomfortable about killing the threads, you can close the queue instead
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<warreng_>
i wasn't uncomfortable until you said that... should i be uncomfortable about killing thread? :)
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<matthewd>
In general yes, it's bad practice and dangerous. In this case, no, because we know exactly where it's stuck waiting.
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<matthewd>
Bad/dangerous == any random innocent-looking line of code can suddenly raise an exception. Has the potential to wreak havoc on your nice careful ensure clauses, for example.
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<matthewd>
I don't understand why you've turned a one-liner into a whole separate thread to join, but yes, that looks equivalent.
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<warreng_>
long story short, this is an extraction of a bigger chunk of code. that timer is already in place with a 1 second sleep doing some other things as well
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<warreng_>
(basically just debug logging on the status of queues and workers and so forth)
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<warreng_>
anyways, i've been running testing this a bit locally and it seems to work perfectly... thanks so much for the help!
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<matthewd>
You're welcome! Always fun to think through threading stuff
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<geekb4ck_>
having trouble with UnixSocket. I'm able to use 'socat' to read/write a socket but when I run my Sinatra app, it creates a <UNIXSocket:fd> object but I'm not able to read/write. Can someone point me to docs to help out?
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<knutmithut>
Hey, is there a way to tell bundler to just create the Gemfile.lock (without actually installing), so it's faster?
<matthewd>
knutmithut: `bundle lock`
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<knutmithut>
thanks!
<Slinky_Pete>
Hey, quick Question I accidentally sent a code snippet over many send on the rails channel and got banned, lol.... anyone know how to fix this?.... it was a irc Noob mistake
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<Slinky_Pete>
many lines ant then sent*
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<Papierkorb>
Slinky_Pete: Are you just not able to talk? You're in #RubyOnRails
<Papierkorb>
Slinky_Pete: In either case, I'm not able to help directly. I suggest you ask one of the currently online operators here: https://ruby-community.com/pages/irc_staff
<Slinky_Pete>
<Papierkorb> It give me a Error(404): #RubyOnRails Cannot send to channel
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<Slinky_Pete>
Awesome thanks@
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<cagomez>
I have an object called foo, with methods foo.format_pay_date, foo.format_recv_date, etc. how do I dynamically call format* methods?
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<Papierkorb>
cagomez: You can use #public_send like `foo.send("format_pay_date", some_argument_to_format_func, ...)`
<Papierkorb>
foo.public_send(..)`
<Papierkorb>
You can use #send, but if not needed, #public_send is better.
<cagomez>
Papierkorb: yup, just tried that. since it's foo.format* , is string concat hacky?
<Papierkorb>
cagomez: What's your use-case?
<cagomez>
Papierkorb: I need to call that method to retrieve an attribute. the method formats an attribute and returns a string
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<Papierkorb>
cagomez: as far #public_send is concerned, doing it like public_send("format_#{which_one}") is fine
<cagomez>
very nice! thanks
<havenwood>
Slinky_Pete: Try talking in #RubyOnRails now.
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<Papierkorb>
cagomez: If you let the user choose one (e.g. through a combobox on the web), make sure check the input against a whitelist of allowed method names
<cagomez>
yes, definitely Papierkorb. working on a whitelist
<Slinky_Pete>
<havenwood> thank you!
<havenwood>
Slinky_Pete: you're welcome
<Papierkorb>
cagomez: A simple `foo.public_send(...) if %w[ pay_date something_else and_so_on ].includes?(which_one)` suffices for the start
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<Papierkorb>
cagomez: include?* - includes? is a rails-ism :)
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<cagomez>
cool, thanks :)
<Papierkorb>
Cheers
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<Zarthus>
try asking #rubyonrails
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<newrubycoder>
is there any way to not delete the characters i exclude when i set a range for sorting? like `words.split.map { |k| k.chars.sort[1..-2] }` i dont get the first and last letter back