Logs: liberachat/#haskell
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| 2026-04-18 10:24:42 | <Milan_Vanca> | Hello guyz, this might be offtopic but in the end it is related to haskell. Imaigne program you parallelize it and gain speedup... Then some time later the same program parallelized gained slowdown. My question is could different CPU show slowdown? |
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| 2026-04-18 10:34:55 | <darkling> | Yes. Just off the top of my head, there's memory bandwidth and SMT that could affect the parallelism. There's undoubtedly a bunch of other reasons that I haven't thought of yet. |
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| 2026-04-18 10:49:25 | <Milan_Vanca> | Ah paralelization is hard... |
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| 2026-04-18 11:19:39 | <Milan_Vanca> | I have found yet another interesting fact same CPU idle, seq = 0.6s, par = 0.3s, CPU busy seq = 2s, par= 4,3s |
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| 2026-04-18 11:20:33 | <Milan_Vanca> | I would expect still 2x speedup so when CPU is busy par should be 1s. But it is not... interesting |
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| 2026-04-18 11:46:57 | <jreicher> | Milan_Vanca: did you add any locking or resource contention to introduce the parallelisation? |
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| 2026-04-18 11:47:41 | <gentauro> | Milan_Vanca: from uni days, CPU's aren't all what you expect (except the PlayStation 3 cell processor). Most parts of CPU are used by branch-prediction |
| 2026-04-18 11:47:57 | gentauro | this is a longer story and not really related to Haskell as you say |
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| 2026-04-18 11:51:58 | <Milan_Vanca> | jreicher: I am using from Control.Parallel.Strategies, rseq, parList.. |
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| 2026-04-18 11:53:16 | <Milan_Vanca> | gentauro: I get that there is branch-prediction and choosing wrong branch slows execution down. However other processes don't "poision" branch prediction for other processes right? |
| 2026-04-18 11:53:31 | <Milan_Vanca> | Or do they? |
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| 2026-04-18 11:57:35 | <Milan_Vanca> | gentauro: And what do you mean by "except the PlayStation 3 cell processor"? |
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| 2026-04-18 12:25:55 | <yin> | it breaks my heart having to discard all my elegant purely functional solutions with knot tying and all that good stuff |
| 2026-04-18 12:26:30 | <yin> | when the time to optimize comes |
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| 2026-04-18 12:27:48 | <yin> | import Data.Vector here I come... |
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