Merge pull request #605 from github/weekly-notes

Weekly notes for 06/06

weekly/2016-06-06.md

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+# May 31th, 2016
+
+## Agenda
+
+1. Retrospective on last week:
+	- What went well?
+	- What was challenging?
+	- What did you learn?
+
+
+## What went well?
+
+@robrix:
+
+- As of this morning we’re pushing data to graphite.
+- There's a 2 hour window of when data is pulled in to graphite.
+- We have a much more thorough understanding of the shape of the SES problems.
+
+@rewinfrey:
+- Came away with a much more thorough understanding of SES.
+- Pairing with Rob on the profiling issues.
+
+@joshvera
+- Exploring the current productions of tree-sitter output.
+- Got an airbnb for the Mini-Summit.
+
+
+## What was challenging?
+
+@robrix:
+- SES performance has been a problem. Briefly confused into thinking we had solved the problem. We’re profiling semantic-diff-tool and running the tests on semantic-diff. If we don’t clean semantic-diff-tool then it doesn’t know that semantic-diff has been rebuilt and it doesn’t try to relink it. Happens specifically when changing branches. 
+- SES performance depends on O(n) cost function.
+
+@rewinfrey:
+- Heartbreaking to discover that a huge performance win was a bad build.
+- Felt like it was hard to contribute to the deployment and build process.
+- Do we have a fallback in place in case S3 fails?
+
+@joshvera:
+- Error productions from tree-sitter are difficult to debug and obscure diff summary output.
+- Understanding and communicating how our deployment process works to other people. Maybe this means we need better documentation?
+
+
+## What did you learn?
+
+@robrix:
+- Learning about parallelism because we have large asymptotic factors in SES.
+- Developed a stronger intuition for why cost has to be linear with respect to the size of the diff tree.
+
+@rewinfrey:
+- Learned a lot about profiling in Haskell.
+- Learned how to use Profiteur to visualize the space and time costs for a given computation.
+- Trying to use the Eval monad to parallelize the Minimax algorithm.
+
+@joshvera:
+- Learned about designing CRISPR proteins that can be edited into bacteria to defend against viruses and plasmids.
+- Read up on GHC's Core language in order to understand some of the optimizations GHC performs.
+
+
+## Other Items
+
+- Mini-Summit plans set for the week of June 20th.
+- Rob on vacation starting Tuesday June 7th! :sunglasses: