| commit | 20eeaad66ca528c262c473ce5c82b349f32b7a53 | [log] [tgz] |
|---|---|---|
| author | ulfjack <ulfjack@google.com> | Mon Feb 18 02:51:55 2019 -0800 |
| committer | Copybara-Service <copybara-worker@google.com> | Mon Feb 18 02:54:27 2019 -0800 |
| tree | 84c481fb214fc413c1ffdca8e2bc80e020524b7b | |
| parent | 45e68f2f4344afa32f91b835888123cda3a77dc6 [diff] |
Add Skyframe support for external computations Add a SkyFunction.Environment.dependOnFuture() method to register a dependency on the completion of a ListenableFuture. Once all such futures are completed, the current node is re-enqueued. We combine all futures that are registered in the same pass, and treat them as a single logical dependency. To that end, we add another counter to NodeEntry that does just that, but otherwise use the same signalDep method. This is in preparation for supporting async action execution, i.e., allowing actions to run in parallel without blocking a Skyframe thread. We have reason to believe that this will be a significant performance win for large builds: if there are more actions that could be run than available jobs, but cranking up jobs is prohibitively costly. In addition, async action execution also improves Bazel's command-line output; since we no longer block Skyframe threads on action execution, these threads are free to continue exploring the action graph, which means we'll see the number of outstanding actions more quickly go to the expected maximum for that build (excluding flaky test retries and exclusive tests, which are not modeled in the action graph). Progress on #6394. PiperOrigin-RevId: 234450510
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