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build(gmd): cap managed-device emulators to 1 concurrent (serial) to avoid local VT-x contention

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The e2e Gradle Managed Device group spans api29-36 and org.gradle.parallel=true
is set, so a local e2eGroupDebugAndroidTest (or preflight's api36DebugAndroidTest)
can launch several emulators at once. They contend for the same VT-x/HAXM
virtualization slot on a single machine and hang at 0% CPU with "another
emulator instance is running". Set
android.experimental.testOptions.managedDevices.maxConcurrentDevices=1 in
gradle.properties to force GMD emulator runs serial locally.

CI is unaffected: its e2e matrix boots one emulator per API level on separate
GitHub Actions runners via reactivecircus/android-emulator-runner and
connectedDebugAndroidTest, not these Gradle Managed Device tasks, so the cap
doesn't apply there regardless.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
JMR-dev
2026-07-03 16:45:24 -05:00
co-authored by Claude Opus 4.8
parent f33b111256
commit 05b43f4510
1 changed files with 11 additions and 0 deletions
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gradle.properties
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@@ -9,3 +9,14 @@ android.useAndroidX=true
# Kotlin (built-in Kotlin is enabled by default in AGP 9; the Kotlin version is set # Kotlin (built-in Kotlin is enabled by default in AGP 9; the Kotlin version is set
# via the buildscript classpath in the root build.gradle.kts). # via the buildscript classpath in the root build.gradle.kts).
kotlin.code.style=official kotlin.code.style=official
# Gradle Managed Devices (app/build.gradle.kts `testOptions.managedDevices`): cap the number
# of emulators Gradle boots at once to 1. The `e2e` device group spans api29-36 and
# org.gradle.parallel=true is on, so without this cap a local `e2eGroupDebugAndroidTest` (or
# the /preflight skill) can launch several emulators concurrently; they contend for the same
# hardware VT-x/HAXM virtualization slot and hang at 0% CPU ("another emulator instance is
# running"). This forces GMD emulator runs to be serial on a single machine. Does not affect
# CI: the `e2e` matrix in .github/workflows/ci.yml runs each API level's emulator on its own
# GitHub Actions runner via reactivecircus/android-emulator-runner + connectedDebugAndroidTest,
# not via these Gradle Managed Device tasks, so this cap has no effect there either way.
android.experimental.testOptions.managedDevices.maxConcurrentDevices=1