This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html
Set by lizmat on 8 June 2022.
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disbot4 <simon_sibl> Hii ! 03:26
<simon_sibl> I am not sure to understand, is that normal that raku -e 'my @a = do for ^1_000_000 { .is-prime }' is faster than raku -e 'my @a = race for ^1_000_000 { .is-prime }'
<simon_sibl> I thought race would be faster since it's supposed to do parallelism ? 03:27
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disbot4 <simon_sibl> (Same result using hyper) 03:39
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disbot4 <jubilatious1_98524> m: time raku -e 'my @a; for (^1_000_000) {@a.push: .is-prime }' 04:15
<Raku eval> Exit code: 1 ===SORRY!=== Error while compiling /home/glot/main.raku Two terms in a row at /home/glot/main.raku:1 ------> time⏏ raku -e 'my @a; for (^1_000_000) {@a.pu expecting any of: infix infix stopper statement end statement modifier statement modifier loop
<jubilatious1_98524> m: raku -e 'my @a; for (^1_000_000) {@a.push: .is-prime }' 04:16
<Raku eval> Exit code: 1 ===SORRY!=== Error while compiling /home/glot/main.raku Two terms in a row at /home/glot/main.raku:1 ------> raku -e⏏ 'my @a; for (^1_000_000) {@a.push: .is- expecting any of: infix infix stopper postfix statement end statement modifier statement modifier loop
<jubilatious1_98524> m: my @a; for (^1_000_000) {@a.push: .is-prime } 04:17
<Raku eval>
<jubilatious1_98524> Yeah, race should be faster but isn't.
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disbot4 <simon_sibl> m: my @a; for (^1_000_000) {@a.push: .is-prime } 04:56
<Raku eval>
<simon_sibl> Why I can’t see any output ? XD
<simon_sibl> m: my @a; hyper for (^1_000_000) {@a.push: .is-prime } 04:57
<Raku eval>
<jubilatious1_98524> m: my @a; hyper for (^1_000_000) {@a.push: .is-prime }; say now -INIT now; 05:28
<Raku eval> 2.226502384
<jubilatious1_98524> m: my @a; race for (^1_000_000) {@a.push: .is-prime }; say now -INIT now;
<Raku eval> 2.382826473
<jubilatious1_98524> m: my @a; for (^1_000_000) {@a.push: .is-prime }; say now -INIT now;
<Raku eval> 0.203327596
<jubilatious1_98524> @simon_sibl ☝️ 05:29
<simon_sibl> Thanks ! XD And so yeah indeed I don’t get why race and hyper are slower Race should be faster than hyper because it doesn’t keep order also but it’s the opposite 05:45
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disbot4 <rcmlz> I guess the default batch size is too small 11:10
<rcmlz> method hyper(Int(Cool) :$batch = 64, Int(Cool) :$degree = Kernel.cpu-cores - 1)
<rcmlz> Ealier (6 months ago) in this group Liz explained and gave: 11:13
<rcmlz> <lizmat> m: (^∞).hyper(batch => 2048).grep(*.is-prime)[500000].say; say now - INIT now
<rcmlz> You could run an experiment on batch x degree x size-of-problem to find your optimum. 11:15
<librasteve> time raku -e 'my @a = race (for ^10_000_000 { .is-prime })' => 12.38s 11:19
<librasteve> raku -e 'my @a = race batch => 2048, (for ^10_000_000 { .is-prime })' => 1.55s
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lizmat I don't think that actually hypers 11:23
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disbot4 <rcmlz> How about that experimaent? glot.io/snippets/h9xwkwdb7z (there is always time for asome prokrastination ...) 11:55
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disbot4 <librasteve> very nice experiment… 14:03
<rcmlz> It was fun to do this quick-fun-naive-hack. I guess for some serious analysis someone would need reach for one of the Benchmark modules in raku.land/?q=Benchmark to ensure some statistical significance by running things multiple times and enjoy at the same time automated performance result calculation. 14:16
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