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epriestley 4270649abe Increase the size of the Diffusion commit cache 
Summary:
Ref T12296. This cache is used to cache Git ref heads (branches, tags, etc). Reasonable repositories may have more than 2048 of these.

When we miss the cache, we need to single-get refs to check them, which is relatively expensive.

Increasing the size of the cache to 65535 should only require about 7.5MB of RAM.

Additionally, fill only as much of the cache as actually fits. The FIFO nature of the cache can get us into trouble otherwise.

If we insert "A, B, C, D" and then lookup A, B, C, D, but the cache has maximum size 3, we get this:

  - Insert A, B, C, D: cache is now "B, C, D".
  - Lookup A: miss, single get, insert, purge, cache is now "C, D, A".
  - Lookup B: miss, singel get, insert, purge, cache is now "D, A, B".

Test Plan:
  - Reduced cache size to 5, observed reasonable behavior on the `array_slice()` locally with `bin/repository update` + `var_dump()`.
  - Used this script to estimate the size of 65535 cache entries as 7.5MB:

```
epriestley@orbital ~ $ cat size.php
<?php

$cache = array();

$mem_start = memory_get_usage();
for ($ii = 0; $ii < 65535; $ii++) {
  $cache[sha1($ii)] = true;
}

echo number_format(memory_get_usage() - $mem_start)." bytes\n";
epriestley@orbital ~ $ php -f size.php
7,602,176 bytes
```

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12296

Differential Revision: https://secure.phabricator.com/D17409
2017-02-24 10:54:19 -08:00
bin Remove most of the legacy hunk code 2016-12-13 14:34:36 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Implement new reCAPTCHA interface 2017-02-03 20:06:29 +00:00
resources Add a "Red/Green Colorblind" accessibility mode, make all web UIs and email respect it 2017-02-23 10:57:39 -08:00
scripts Add some sort of sort to Emoji Autocomplete 2017-01-24 20:21:06 -08:00
src Increase the size of the Diffusion commit cache 2017-02-24 10:54:19 -08:00
support Don't combine automatic output compression with "Content-Length" 2016-12-13 14:25:49 -08:00
webroot Hide Conpherence durable column when printing 2017-02-22 12:31:05 -08:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.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 Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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