servo-mac3 dies while building

[jdm]

   Compiling script_layout_interface v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/components/script_layout_interface)
2018-05-17 15:07:57.693 rustc[76516:23111923] Metadata.framework [Error]: couldn't get the client port
   Compiling gfx v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/components/gfx)
2018-05-17 15:08:15.406 rustc[79853:23115377] Metadata.framework [Error]: couldn't get the client port
   Compiling style_tests v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/tests/unit/style)
2018-05-17 15:08:40.282 rustc[84210:23119882] Metadata.framework [Error]: couldn't get the client port
2018-05-17 15:08:42.813 rustc[84761:23120466] Metadata.framework [Error]: couldn't get the client port
   Compiling layout_traits v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/components/layout_traits)
2018-05-17 15:08:54.622 rustc[90473:23126207] Metadata.framework [Error]: couldn't get the client port
   Compiling layout v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/components/layout)
2018-05-17 15:08:54.910 rustc[90621:23126373] Metadata.framework [Error]: couldn't get the client port
   Compiling constellation v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/components/constellation)
2018-05-17 15:09:30.088 rustc[1149:23136751] Metadata.framework [Error]: couldn't get the client port
   Compiling metrics_tests v0.0.1 (file:///Users/servo/buildbot/slave/mac-rel-css1/build/tests/unit/metrics)
2018-05-17 15:09:46.604 rustc[6694:23142338] Metadata.framework [Error]: couldn't get the client port
2018-05-17 15:11:32.554 rustc[19217:23254770] Metadata.framework [Error]: couldn't get the client port
error: Could not compile `script`.

To learn more, run the command again with --verbose.
[Warning] Could not generate notification! Optional Python module 'pyobjc' is not installed.

[highfive]

cc @aneeshusa

[jdm]

top shows that servo-mac1 only has ~2.7gb of RAM free when sitting idle. I think we're just OOMing while building, and it's hitting us frequently.

[jdm]

@edunham Is servo-mac1 supposed to only have ~8gb of RAM? That seems to be 50% of every other mac builder that I've looked at (except for servo-mac7, which also has 8gb).

[jdm]

This is an ongoing problem with servo-mac3, so I've taken to shutting the machine down whenever it starts acting up.

[dralley]

Is the issue still occurring?

[jdm]

Nope.