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epriestley c059149eb9 Remove Drydock host resource limits and give working copies simple limits 
Summary:
Ref T9252. Right now, we have very strict limits on Drydock: one lease per host, and one working copy per working copy blueprint.

These are silly and getting in the way of using "Land Revision" more widely, since we need at least one working copy for each landable repository.

For now, just remove the host limit and put a simple limit on working copies. This might need to be fancier some day (e.g., limit working copies per-host) but it is generally reasonable for the use cases of today.

Also add a `--background` flag to make testing a little easier.

(Limits are also less important nowadays than they were in the past, because pools expand slowly now and we seem to have stamped out all the "runaway train" bugs where allocators go crazy and allocate a million things.)

Test Plan:
  - With a limit of 5, ran 10 concurrent builds and saw them finish after allocating 5 total resources.
  - Removed limit, raised taskmaster concurrency to 128, ran thousands of builds in blocks of 128 or 256.
    - Saw Drydock gradually expand the pool, allocating a few more working copies at first and a lot of working copies later.
    - Got ~256 builds in ~140 seconds, which isn't a breakneck pace or anything but isn't too bad.
    - This stuff seems to be mostly bottlenecked on `sbuild` throttling inbound SSH connections. I haven't tweaked it.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9252

Differential Revision: https://secure.phabricator.com/D14334
2015-10-26 12:39:47 -07:00
bin Provide bin/garbage for interacting with garbage collection 2015-10-02 09:17:24 -07:00
conf Mark some strings for translation 2015-06-09 23:06:52 +10:00
externals Use PEAR Text_Figlet to render figlet fonts 2015-09-13 12:31:07 -07:00
resources Give Harbormaster build steps a "View" page 2015-10-26 12:38:32 -07:00
scripts Provide bin/garbage for interacting with garbage collection 2015-10-02 09:17:24 -07:00
src Remove Drydock host resource limits and give working copies simple limits 2015-10-26 12:39:47 -07:00
support Add a "Startup" to DarkConsole 2015-08-21 14:53:29 -07:00
webroot Give Harbormaster build steps a "View" page 2015-10-26 12:38:32 -07:00
.arcconfig Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.arclint Turn lint TODO comments back on 2015-05-27 10:06:55 -07:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Add custom Cows and Figlet directories to .gitignore 2015-10-08 20:23:05 -07:00
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README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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