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  • h

    happy-kitchen-89482

    07/30/2015, 5:51 PM
    So part of "go support", in practice, might require speeding up Pants startup.
  • e

    enough-analyst-54434

    07/30/2015, 6:07 PM
    Agreed.
  • h

    happy-kitchen-89482

    07/30/2015, 6:17 PM
    Twitter and Square folks - do you have a ballpark number for how long you spend parsing BUILD files on pants startup?
  • w

    witty-crayon-22786

    07/30/2015, 6:18 PM
    for the largest projects, about 10 seconds
  • w

    witty-crayon-22786

    07/30/2015, 6:18 PM
    list ::
    is about 50 now
  • h

    happy-kitchen-89482

    07/30/2015, 6:21 PM
    OK
  • h

    happy-kitchen-89482

    07/30/2015, 6:21 PM
    that makes sense to me
  • e

    enough-analyst-54434

    07/30/2015, 6:21 PM
    Even with that issue sorted, the ~500ms startup vs << for go will be irritating folks
  • h

    happy-kitchen-89482

    07/30/2015, 6:21 PM
    and seems like a good thing to optimize
  • h

    happy-kitchen-89482

    07/30/2015, 6:22 PM
    yes, we should figure out what else we spend time on in startup
  • h

    happy-kitchen-89482

    07/30/2015, 6:22 PM
    because I believe launching a python interpreter is something like 40ms? So it's not that.
  • e

    enough-analyst-54434

    07/30/2015, 6:22 PM
    I'm a big fan of a small c binary to send cli args to the server
  • h

    happy-kitchen-89482

    07/30/2015, 6:22 PM
    =you
  • h

    happy-kitchen-89482

    07/30/2015, 6:23 PM
    a server with a cached parsed build graph, and cached fingerprints of all files.
  • e

    enough-analyst-54434

    07/30/2015, 6:23 PM
    At that point we could look at pypy even and see if that helps much, although I believe that holds us back from python3 language features
  • a

    ancient-stone-50795

    07/30/2015, 6:25 PM
    Copy code
    $time ./pants list ::
       21.91 real        12.84 user         8.21 sys
  • a

    ancient-stone-50795

    07/30/2015, 6:25 PM
    but no one runs operations on :: that I know of.
  • a

    ancient-stone-50795

    07/30/2015, 6:25 PM
    Is there a line item in the 
    ./pants server
    report that displays this number?
  • r

    rough-minister-58256

    07/30/2015, 6:26 PM
    pantsd should help w/ this.
  • e

    enough-analyst-54434

    07/30/2015, 6:27 PM
    @ancient-stone-50795: yes - mainlistlist
  • a

    ancient-stone-50795

    07/30/2015, 6:29 PM
    Screen Shot 2015-07-30 at 2.28.44 PM.png
  • a

    ancient-stone-50795

    07/30/2015, 6:30 PM
    Here is another target that folks compile:
  • a

    ancient-stone-50795

    07/30/2015, 6:30 PM
    Screen Shot 2015-07-30 at 2.29.54 PM.png
  • a

    ancient-stone-50795

    07/30/2015, 6:31 PM
    A bigger project bumps up the ‘setup’ step to .768 seconds
  • w

    witty-crayon-22786

    07/30/2015, 6:32 PM
    @happy-kitchen-89482, @enough-analyst-54434 : to be clear, that's why we have kris working on the daemon
  • h

    happy-kitchen-89482

    07/30/2015, 6:32 PM
    indeed
  • e

    enough-analyst-54434

    07/30/2015, 6:32 PM
    Yup - understood
  • w

    witty-crayon-22786

    07/30/2015, 6:32 PM
    parse in the background
  • w

    witty-crayon-22786

    07/30/2015, 6:32 PM
    then start hashing in the background
  • h

    happy-kitchen-89482

    07/30/2015, 6:32 PM
    that was my assumption
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