cldellow

• https://nixos.org/~eelco/pubs/phd-thesis.pdf
  • The thesis that motivates the need for a better way of managing builds/deploys of packages.
• http://datakurre.pandala.org/2015/10/nix-for-python-developers.html and https://www.slideshare.net/datakurre/nix-for-python-developers
  • Talks about practical use of Nix for python development.
• https://nixos.org/nixos/nix-pills/
  • Multipart blog series on Nix the package manager and expression language.
• https://www.reddit.com/r/NixOS/comments/5dz8fp/list_of_companies_using_nixos/
  • Social proof: companies that use Nix. Includes Pinterest, Mozilla, Teamviewer.
• https://medium.com/@MrJamesFisher/nix-by-example-a0063a1a4c55
• Tutorial on the Nix expression language.

cldellow

Nix thesis

I read https://nixos.org/~eelco/pubs/phd-thesis.pdf, which outlines Nix, a “functional” package manager.

It motivates the need for new take on package management by analogy to memory management in programming languages.

It contrasts how software deployment works today (“Fuck it, I’m sure /usr/bin/local/python is a reference to a python 2.7.12 install with PIL available”) to how we used to write software (“Fuck it, I’m sure 0x7FEA6072 is the address of the array of files; so clearly, assuming a 32-bit address space, the seventh file is at 0x7FEA608A.”)

In both cases, as long as your assumption was correct, things go swimmingly. But it could be easier and rely less on hoping your assumptions are correct.

cldellow

WITH minutes AS
  (SELECT CASE
              WHEN job_name = '' THEN '<idle>'
              WHEN job_name like 'com.snapsort.logloader.%' then substr(job_name, length('com.snapsort.logloader.') + 1) 
              ELSE job_name 
          END AS job_name,
          job_id,
          date_trunc('minute', ts) as ts,
          count(DISTINCT HOST) AS servers,
          sum(LOAD) AS LOAD,

cldellow

False negatives (NO_MATCH -> model)

Olympus PEN E-PL1

listing manufacturer: Olympus
        title:        OLYMPUS Pen E-PL1 - champagne + M.ZUIKO DIGITAL ED 14-42 mm Lens + Pix Medium Case + Pocket in black + 16 GB SDHC Memory Card + PS-BLS1 Battery
        price:        499.99 GBP

our answer:       olympus_pen_e-pl1
    manufacturer: Olympus
    model:        PEN E-PL1

cldellow

aggregator_expire thread:

root@metrics1:/build1-data# strace -p 25551 -Tc 
Process 25551 attached
^CProcess 25551 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 97.95   21.433371      154197       139           nanosleep
  1.88    0.411658          32     12876           write
  0.12    0.026664          33       798       135 futex

cldellow

http://s3.amazonaws.com/sortable-assets/misc/colin/eduardo/1/index.html

http://s3.amazonaws.com/sortable-assets/misc/colin/eduardo/2/index.html

cldellow

https://s3.amazonaws.com/sortable-assets/misc/colin/jharris/index.html

cldellow

Comparisons of 20 runs of keywords/prefix "a", limit of 100,000:

old-times = master
new-times = doing sort on strings to avoid parsing and allocating an unbounded amount of KeywordResults
new-times-geometric = changing how bigNHits grows
new-times-geometric-no-sign = no longer permitting negative numbers in the freq column

x old-times
+ new-times
* new-times-geometric

cldellow

cldellow

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