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<
felipec >
Is it normal that this is so slow?
18:31
<
felipec >
actions = Array.new(256) { [0, 0] }
18:31
<
felipec >
1_000_000.times { actions.each { |(type,index)| $x = type } }
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<
[0x1eef] >
felipec: Equivalent to 1_000_000 * 256. So yeah, I'd expect it to take a while.
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<
felipec >
[0x1eef]: takes 0.2 seconds in C
19:55
<
felipec >
27 seconds in Ruby
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<
[0x1eef] >
Ruby performance is nowhere near C performance.
19:57
<
felipec >
I know, but it's surprising a loop doing nothing takes a while.
19:58
<
[0x1eef] >
A loop that iterates 256 million times.
19:59
<
havenwood >
felipec: A JIT like TruffleRuby's will likely fold it away similar to an advanced compiler.
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<
havenwood >
felipec: When using the reference implementation of Ruby, be sure to enable YJIT.
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<
havenwood >
Not doing much repeatedly can often be optimized, but microbenchmarks of this sort of often of dubious value.
20:01
<
havenwood >
/s/of/are/
20:04
<
[0x1eef] >
You can also consider dropping down to C when you hit performance bottlenecks. The Ruby C API is nice, and easy to use. It's usually a last resort though, especially for performance-type stuff.
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<
felipec >
havenwood: OK, I tried with RUBY_YJIT_ENABLE=1, the loop test was reduced from 12s to 10s.
20:14
<
felipec >
But the real test was reduced from 27s to 13.
20:16
<
felipec >
[0x1eef]: that's precisely what I did: I wrote a simple linked list implementation in C and wrote Ruby bindings for it.
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<
[0x1eef] >
Sounds good.
20:18
<
felipec >
With YJIT enabled Ruby 3.3 takes as much time as Go.
20:20
<
[0x1eef] >
The given code appears to assign 0 to $x 256 million times so I'm not sure there's much there but I assume you are benchmarking something a bit more realisitic.
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<
felipec >
[0x1eef]: yeah, every single one of those iterations is going to do something, for example type=1 is add a node, and type=2 is deleting a node.
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<
Synthead >
How do I create an ascii 8-bit string as a frozen constant?
20:46
<
Synthead >
READ_HEADER = "\xc5".force_encoding(Encoding::ASCII_8BIT)
20:47
<
Synthead >
`force_encoding': can't modify frozen String: "\xC5" (FrozenError)
20:47
<
Synthead >
this is what I get when attempting to do it this way
20:47
<
Synthead >
I also tried [0xc5].pack("C"), but for some reason, this creates 197 instead of "\xC5"
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<
Synthead >
ah oops, it was me: [0xc5].pack("C") works just fine
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