[infra] Use fewer cores on Android shards
The shards are currently defaulting to use j4 because the docker host
has 4 cores. 6 devices share one host and are therefore trying to run 20
processes competing for the only 4 physical cores. The docker hosts will
soon be upgraded to have 8 cores. j2 will result in 10 processes
competing for those 8 cores which should result in a better balance
between utilization and latency.
Change-Id: Ieb67cb92f17317108d1a1d3da710c58400484a7c
Reviewed-on: https://dart-review.googlesource.com/c/91540
Reviewed-by: William Hesse <whesse@google.com>
diff --git a/tools/bots/test_matrix.json b/tools/bots/test_matrix.json
index 9a9323e..174149e 100644
--- a/tools/bots/test_matrix.json
+++ b/tools/bots/test_matrix.json
@@ -491,7 +491,8 @@
{
"name": "vm tests",
"arguments": [
- "-ndartkp-android-${mode}-${arch}"
+ "-ndartkp-android-${mode}-${arch}",
+ "-j2"
],
"fileset": "vm-kernel",
"shards": 15
