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mpweiher's profile
Marcel Weiher
Marcel Weiher
Marcel Weiher
@mpweiher

Marcel Weiher

@mpweiher

BBC, Apple, Livescribe, 6wunderkinder, Microsoft Higher Order Messaging, Private Pilot + Paraglider, http://objective.st  I don't speak for my employer(s)

Joined February 2012
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    Previous Tweet
    1. Marco Scheurer ‏@phink0 May 28

      @wilshipley @mpweiher Nice post as usual. Wouldn't rewriting in ObjC also make for better code? Filter map & foreach in ObjC? Not so hard

      0 replies 0 retweets 1 like
    2. Marcel Weiher ‏@mpweiher May 28

      @phink0 @wilshipley Good point. The BBC system I rewrote from ObjC to Java (WO5) also got significantly better. Had nothing to do with lang.

      0 replies 0 retweets 1 like
    3. Wil Shipley ‏@wilshipley May 28 San Francisco, CA

      @mpweiher @phink0 It’s not so hard but also not so fast. Swift is VERY fast and efficient, because it knows the types.

      0 replies 0 retweets 0 likes
    4. Marcel Weiher ‏@mpweiher May 28

      @wilshipley @phink0 [fast] Is this something you expect or something you measured? My measurements to date almost exclusively show opposite.

      0 replies 0 retweets 2 likes
    5. Marco Scheurer ‏@phink0 May 29

      @mpweiher @wilshipley What am I doing wrong? Swift 6x slower than very naive ObjC filter. XCode7.3.1, [-O], iPhone5Spic.twitter.com/U20uvcRPFj

      0 replies 3 retweets 9 likes
    6. Marcel Weiher ‏@mpweiher May 29

      @phink0 @wilshipley That looks about smack in the middle of the relative slowdowns I have been seeing.

      0 replies 0 retweets 1 like
    7. Michael Tsai ‏@mjtsai May 29

      @mpweiher @phink0 @wilshipley That’s very interesting. Have you tried profiling it? Bridging overhead?

      0 replies 0 retweets 0 likes
    8. Marco Scheurer ‏@phink0 May 29

      @mjtsai @mpweiher @wilshipley Here's the profile (and for completeness the ObjC simple/naive/ugly filter category)pic.twitter.com/lbeIS8sEg8

      0 replies 0 retweets 1 like
    9. Michael Tsai ‏@mjtsai May 29

      @phink0 @mpweiher @wilshipley The Foundation -hasPrefix: does an exact compare; maybe Swift stdlib one does a fancy Unicode compare.

      0 replies 0 retweets 0 likes
    10. Joe Groff ‏@jckarter May 29

      @mjtsai @phink0 @mpweiher @wilshipley Yeah. Some Unicode operations are also implemented naively and make unnecessary extra copies.

      0 replies 0 retweets 2 likes
      Marcel Weiher ‏@mpweiher May 29

      @jckarter @mjtsai @phink0 @wilshipley Dunno, I see “CFStringFindWithOptionsAndLocale()” in the profile and also when I profile -hasPrefix:

      7:13 AM - 29 May 2016
      0 replies 0 retweets 0 likes
        1. Joe Groff ‏@jckarter May 29

          @mpweiher @mjtsai @phink0 @wilshipley By "naive" I mean "copy into a CF string and hand off to a CF fn". Super naive

          0 replies 0 retweets 0 likes
        2. View other replies
        3. Marco Scheurer ‏@phink0 May 29

          @jckarter @mpweiher @mjtsai Busy rewriting foundations, with new bugs and inefficiencies. Isn't it worrying? For what practical benefits?

          0 replies 0 retweets 1 like
        4. View other replies
        5. Joe Groff ‏@jckarter May 29

          @phink0 @mpweiher @mjtsai We're expressly *not* rewriting foundations. Cocoa is still Cocoa.

          0 replies 0 retweets 2 likes
        6. Marcel Weiher ‏@mpweiher May 29

          @jckarter @phink0 @mjtsaihttps://github.com/apple/swift-corelibs-foundation …

          0 replies 0 retweets 1 like
        7. View other replies
        8. Marcel Weiher ‏@mpweiher May 29

          @jckarter @phink0 @mjtsai And what is String, Array, Dictionary etc. if not new “foundations” (and exactly where Marco found inefficiencies)

          0 replies 0 retweets 1 like
        9. View other replies
        10. Joe Groff ‏@jckarter May 30

          @mpweiher @phink0 @mjtsai Array and Dict needed to be able to contain unboxed value types; String needed efficient copy-on-write.

          0 replies 0 retweets 1 like
        11. Marcel Weiher ‏@mpweiher May 30

          @jckarter @phink0 @mjtsai s/need/want/g

          0 replies 0 retweets 0 likes
        12. Guy English ‏@gte May 30 San Diego, CA

          @mpweiher @jckarter @phink0 @mjtsai I think that's a pretty reasonable thing to want. It's hardly some crazy boondoggle.

          0 replies 0 retweets 1 like
        13. View other replies
        14. Show more
        1. Michael Tsai ‏@mjtsai May 29

          @mpweiher @jckarter @phink0 @wilshipley If you look at the code, Swift is using kCFCompareNonliteral and NSString is not.

          0 replies 0 retweets 1 like
        2. Marcel Weiher ‏@mpweiher May 29

          @mjtsai @jckarter @phink0 @wilshipley I no longer have access to Foundation source code…

          0 replies 0 retweets 0 likes
        3. Michael Tsai ‏@mjtsai May 29

          @mpweiher @jckarter @phink0 @wilshipley You can see in Hopper that it’s only passing NSAnchoredSearch.

          0 replies 0 retweets 0 likes
        4. Marcel Weiher ‏@mpweiher May 29

          @mjtsai @jckarter @phink0 @wilshipley Just ran some tests and kCFCompareNonliteral does not make a difference with simple prefix comparison

          0 replies 0 retweets 2 likes

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