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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Martin Thompson‏ @mjpt777 27 May 2019
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      After years of working on distributed systems I still keep being surprised by how easy it is miss potential outcomes. The state space is too vast for the human brain.

      6 replies 58 retweets 286 likes
    2. Isaka Traore‏ @itraor 27 May 2019
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      Replying to @mjpt777

      Do you see a role for formal methods here?

      1 reply 0 retweets 3 likes
    3. Martin Thompson‏ @mjpt777 27 May 2019
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      Replying to @itraor

      It's a good question. For some constrained problems yes. However most systems are so large it is not practical to use formal methods on them all.

      1 reply 0 retweets 11 likes
    4. Ron Pressler‏ @pressron 28 May 2019
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      Replying to @mjpt777 @itraor

      TLA+ has been successfully used on large, real world systems. Not only is it practical, but it has been found to reduce total cost.

      1 reply 0 retweets 5 likes
    5. Martin Thompson‏ @mjpt777 28 May 2019
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      Replying to @pressron @itraor

      That's interesting. I'd like to know more. Maybe @hillelogram knows of some larger scale endeavours too?

      3 replies 0 retweets 2 likes
    6. Marc Brooker‏ @MarcJBrooker 28 May 2019
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      Replying to @mjpt777 @pressron and

      We wrote about our experiences with TLA+ on large systems at AWS a couple of years ago: http://lamport.azurewebsites.net/tla/amazon.html  Since then, many teams in AWS have continued to use TLA+, and had a lot of success.

      1 reply 0 retweets 8 likes
    7. Marc Brooker‏ @MarcJBrooker 28 May 2019
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      Replying to @MarcJBrooker @mjpt777 and

      Teams at AWS have also used formal reasoning on critical code (like S2N https://aws.amazon.com/blogs/security/automated-reasoning-and-amazon-s2n/ …), to help reason about security properties (https://aws.amazon.com/blogs/security/protect-sensitive-data-in-the-cloud-with-automated-reasoning-zelkova/ …) and many other places.

      2 replies 0 retweets 7 likes
    8. Marc Brooker‏ @MarcJBrooker 28 May 2019
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      Replying to @MarcJBrooker @mjpt777 and

      The state-space size problem that @mjpt777 pointed out is one of the reasons I've personally found formal methods so useful. I've also found that Pluscal and TLA+ code make great precise documentation of protocols, and are great languages for rapid protocol protyping.

      1 reply 0 retweets 9 likes
      Colm MacCárthaigh‏ @colmmacc 28 May 2019
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      Replying to @MarcJBrooker @mjpt777 and

      There's a nice feedback loop too; modeling and verification makes you really keen to minimize your state space in the first place.

      8:37 AM - 28 May 2019
      • 11 Likes
      • Daniel Erik Paulson Jacob Blain Christen Ron Pressler gemc2 ast Lorin Hochstein E_TOO_MANY_FAILURE_MODES Dan P Marc Brooker
      1 reply 0 retweets 11 likes
        1. New conversation
        2. Martin Thompson‏ @mjpt777 28 May 2019
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          Replying to @colmmacc @MarcJBrooker and

          I found formal methods (Z) useful to get another perspective but have not tried at scale or with TLA+. Maybe it is time to give TLA+ a try.

          1 reply 0 retweets 0 likes
        3. Marc Brooker‏ @MarcJBrooker 28 May 2019
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          Replying to @mjpt777 @colmmacc and

          If you do, check out @hillelogram's book "Practical TLA+". It's a great intro.

          1 reply 0 retweets 3 likes
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