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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 2008

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    Dan Luu‏ @danluu 6 Mar 2018
    • Report Tweet
    • Report NetzDG Violation

    A creator of the C++ STL says they might've used more cache-friendly data structures if HP Labs had the budget to buy HP PA-RISC machines? (via @daniel_bilar )pic.twitter.com/rbghcoofIE

    12:27 PM - 6 Mar 2018
    • 178 Retweets
    • 386 Likes
    • Kyle J Strand ⏐ Τhе Αnⅽⅰеnt Вооеr ⏐ hi o Roman Dzieciol 🍓 team:247472@folding at home Buck Yeh Neeraj Efirion ‏Chris Adams‎
    14 replies 178 retweets 386 likes
      1. New conversation
      2. Fabian Giesen‏ @rygorous 6 Mar 2018
        • Report Tweet
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        Replying to @danluu @daniel_bilar

        This sounds like he's worrying a lot about data caches and not at all about instruction caches which may look good in microbenchmarks but is a bad direction to go for a standard lib, especially when it gets instantiated for 100s of types. :)

        2 replies 1 retweet 9 likes
      3. Fabian Giesen‏ @rygorous 6 Mar 2018
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        Replying to @rygorous @danluu @daniel_bilar

        Data cache-friendlier data structures would be nice (although the top 2 ones I see used, std::vector and std::unordered_map, are not bad on that axis anyway), but the STL already instantiates worrying amounts of code for its containers and algs...

        2 replies 0 retweets 5 likes
      4. 3 more replies
      1. New conversation
      2. Simon Prickett  🇪🇺‏ @simon_prickett 6 Mar 2018
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        Replying to @danluu @enf @daniel_bilar

        I worked at HP Labs on a major C++ product at the time and used to buy our home line of PCs for the team from CompUSA as we couldn’t get our own Vectra line internally. Plenty of HP-UX hardware though.

        1 reply 0 retweets 5 likes
      3. Simon Prickett  🇪🇺‏ @simon_prickett 6 Mar 2018
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        Replying to @simon_prickett @danluu and

        I was also partially responsible for porting and we had money for decent enough Solaris and AIX kit.

        1 reply 0 retweets 3 likes
      4. 2 more replies
      1. New conversation
      2.  🔥 Alexander Gallego‏ @emaxerrno 6 Mar 2018
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        Replying to @danluu @daniel_bilar

        Most cpp projects reimpl large parts of the stdlib - strings, sets, maps (for small), different bucketing for larger maps, different hashing for heavy reads, etc.... Given enough time and engs on it.

        2 replies 0 retweets 4 likes
      3. Sergei Sadovnikov‏ @flex_ferrum 6 Mar 2018
        • Report Tweet
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        Replying to @emaxerrno @danluu @daniel_bilar

        It seems like almost every big software development company (with C++ projects) implements it's own version of STL...

        0 replies 2 retweets 9 likes
      4. End of conversation
      1. New conversation
      2. Shafik Yaghmour‏ @shafikyaghmour 6 Mar 2018
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        Replying to @danluu @meetingcpp @daniel_bilar

        Do you have a link?

        1 reply 0 retweets 0 likes
      3. Daniel Bilar‏ @daniel_bilar 6 Mar 2018
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        Replying to @shafikyaghmour @danluu @meetingcpp

        1/3 way downhttps://interviews.slashdot.org/story/15/01/19/159242/interviews-alexander-stepanov-and-daniel-e-rose-answer-your-questions …

        0 replies 2 retweets 7 likes
      4. End of conversation
      1. Michael‏ @michael90187356 6 Mar 2018
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        Replying to @danluu @daniel_bilar

        BTW google_dense_hashmap is super fast compared to libc++/stdc++ STL map and unordered_map. dense_hashmap is a bucket-less scanning hashtable with tombstones for deleted entries. It doesn’t pointer chase like a bucketed hashtable so is cache friendly.https://github.com/sparsehash/sparsehash …

        0 replies 1 retweet 5 likes
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      1. New conversation
      2. Simon Prickett  🇪🇺‏ @simon_prickett 6 Mar 2018
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        Replying to @danluu @enf @daniel_bilar

        IIRC HP at the time was also building its own CORBA ORB as it didn’t buy Orbix.

        1 reply 0 retweets 1 like
      3. (((David Brower)))‏ @dbrower 7 Mar 2018
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        Replying to @simon_prickett @danluu and

        Everybody was building an Orb after not buying Orbix (raises hand)

        2 replies 0 retweets 2 likes
      4. 2 more replies

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