Start notification-mode runs before watch discovery - #838
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August 6, 2026 14:17
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this improved our cold start for web specifically by like 40% |
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## Why Notification-mode devservers can stay alive while iBazel discovers their watch graph. Waiting for that query before launch puts a large, unnecessary delay on startup. ## What changed Port [bazelbuild#838](bazelbuild#838) onto the Perplexity fork: - start notification-mode runs before watch discovery - install watchers afterward and send a catch-up graph build - preserve query-first behavior for restart-mode targets, builds, tests, and coverage - compose the upstream lifecycle change with our structured BEP output notifications
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gentle ping @achew22 pls pls :) |
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im also more than happy to help maintain this project as well |
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Why
ibazel rundiscovers the full transitive watch graph before starting the target. In large workspaces, this can delay a notification-mode dev server by tens of seconds even though the process can stay alive while iBazel installs watchers.What
ibazel_notify_changestargets before full watch discoveryVerification
The notification example served before watch discovery completed, received the catch-up build without restarting, then rebuilt normally after a source edit.