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7759 :: Nim (devel) compilation takes a very long time with option --gc:orc

• HJarausch (orginal) [2021-04-07T18:55:59+02:00] view original

  I have a small source file (less than 200 lines) but which uses Weave, which is a complicated beast. Just trying to compile it I get

  
  nim c --threads:on -d:release Count_Reduction_WV_NL.nim  9.07s user 0.51s system 327% cpu 2.923 total
  Run

  but with --gc:arc

  
  nim c --threads:on --gc:arc -d:release Count_Reduction_WV_NL.nim  898.88s user 0.70s system 100% cpu 14:51.44 total
  Run

  This is nearly 305 times slower? Is this to be expected?

  
  nim -v
  Nim Compiler Version 1.5.1 [Linux: amd64]
  Compiled at 2021-04-07
  Copyright (c) 2006-2021 by Andreas Rumpf
  
  git hash: 834d5641e88b144c1cf94fa13f567b0a2acda977
  active boot switches: -d:release
  Run

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• HJarausch (orginal) [2021-04-07T18:57:59+02:00] view original

  Sorry, the title was wrong: I didn't use --gc:orc but --gc:arc

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• Araq (orginal) [2021-04-07T19:29:49+02:00] view original

  This is nearly 305 times slower? Is this to be expected?

  Definitely not. :-) Some slowdown is expected as --gc:arc is more complex to process for the compiler but I'm talking about 20-50% here, not of a factor of 30.

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