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<Guest98>
Hello, I have this requirement where I need to call a microservice and return its response immediately on one case, but on the 2nd case a batch call on the microservice, where response times is not so critical but still within the same HTTP request. is this a usecase for sidekiq?
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<kjetilho>
I'm trying to understand how to make Resolv return AAAA records regardless of local availability of IPv6, but I don't understand how it is supposed to work. e.g., how can I update DefaultResolver?
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<kjetilho>
okay, more minimal example - this only returns A records in an IPv6 deprived environment, and I can't find the setting to change that? Resolv::DNS.new.each_address('vg.no') { |x| puts(x) }
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<Guest38>
I came across a difference in utf-16 handling between ruby 3.1 and ruby 3.2, for instance, "example".force_encoding(Encoding::UTF_16).valid_encoding? gives false in 3.1, but true in 3.2
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<Guest38>
anyone know if that's intended behaviour?
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<kjetilho>
if I have a function which takes a block like an iterator - what is the idiomatic to just collect the emitted values?
<weaksauce>
kjetilho can you gist what you mean?
<kjetilho>
example: get the results in an array: Resolv.each_address(value)
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<kjetilho>
but now I see I can simply use getaddresses() instead. would be interested to know if there is a good way of doing it, though.
<kjetilho>
better(?) than `acc = []; Resolv.each_address(value) { |x| acc.extend(x) }` I mean
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<kjetilho>
(I meant acc.append of course)
<weaksauce>
map could be used
<weaksauce>
if you have an iterator
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<weaksauce>
depends on what each_address returns if you call it bare
<kjetilho>
it requires the block
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<weaksauce>
is the code under your control?
<kjetilho>
no, it is Resolv
<kjetilho>
so I take it there is no general idiom for this, that's OK
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<weaksauce>
yeah if you have a library like that i don't think there's a nice way to do it
<weaksauce>
other than using the other call
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<weaksauce>
the general idiom is to return an enumerator if you are not passed in a block though
<weaksauce>
this one breaks that convention
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<kjetilho>
aha, nice to know. I guess they broke it since they have the getaddresses() function.
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<gr33n7007h2>
works fine for 100,000 fibers, after that, no way
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<havenwood>
gr33n7007h: Ruby's threads are backed 1:1 by system threads, which typically have limits somewhere in the range of thousands per processor.
<havenwood>
You can change Ruby settings to allow more Fibers.
<havenwood>
And change system settings to allow more Threads, but you're going to be able to scale to far more Fibers.
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<gr33n7007h>
havenwood: i thought maybe recursion was a factor too. i wanted to see how ruby fairs with other languages.
<gr33n7007h>
havenwood: get you get it working with a million fibers? i've changed all ruby settings that i know of.
<gr33n7007h>
system settings also
<gr33n7007h>
python does it in ~20 secs the like of luajit, rust, go and earlang is ~2 secs
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<gr33n7007h>
i just can't get ruby to work at all just consumes to much memory before the program/os freezes altogether
<gr33n7007h>
before i set vm.max_map_count to max i was getting this exc. FiberError: can't set a guard page: Cannot allocate memory
<gr33n7007h>
>> RubyVM::DEFAULT_PARAMS
<ruby[bot]>
gr33n7007h: # => {:thread_vm_stack_size=>1048576, :thread_machine_stack_size=>1048576, :fiber_vm_stack_size=>131072, ...check link for more (https://carc.in/#/r/gm8m)
<gr33n7007h>
fiber_vm_stack_size is this the default allowed fiber size?
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<gr33n7007h>
How to change this value?
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<gr33n7007h>
I tried with `RUBY_VM_FIBER_VM_STACK_SIZE` env var doesn't seem to change anything
<gr33n7007h>
anyway if you come up with anything, ping me! ;)
<gr33n7007h>
watching a bit of netflix now :D recommend (wrong side of the tracks) it's ace!
<havenwood>
gr33n7007h: "The fiber pool stack size is (guard page + vm_stack_size + fiber_machine_stack_size)."
<havenwood>
Reduce the stack size, more Fibers.
<gr33n7007h>
havenwood: how to reduce stack size?
<gr33n7007h>
havenwood: ah! it works!!!!!
<havenwood>
Set both RUBY_VM_FIBER_VM_STACK_SIZE and RUBY_FIBER_MACHINE_STACK_SIZE.
<gr33n7007h>
RUBY_VM_FIBER_VM_STACK_SIZE=1024 ruby skynet.rb #=> Result: 4999950000 in 1.598958043003222 seconds.
<havenwood>
You can further reduce machine stack, but looks good.
<gr33n7007h>
havenwood: thanks you very much, been struggling with this for hours!
<havenwood>
gr33n7007h: No prob! Happy to help.
<gr33n7007h>
havenwood: cheers man! that's on par with other big dog languages now :)
<gr33n7007h>
havenwood: Appreciate the help dude!
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* gr33n7007h
must remember, reduce the stack size, fibers for everyone!
<[0x1eef]>
Nice :)
<gr33n7007h>
havenwood: RUBY_FIBER_MACHINE_STACK_SIZE lower this env makes it ~3x slower