Limit max CI concurrency to 16 cores

The ARM Travis builders have more cores but seem to hit crashes (OOM
maybe?) with high concurrency, especially when building a commit which
changes headers which cause lots of ccache misses.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/scripts/ci_build.py b/src/scripts/ci_build.py
index e9ab3ffcc..56f62b13b 100755
--- a/src/scripts/ci_build.py
+++ b/src/scripts/ci_build.py
@@ -17,10 +17,11 @@ import optparse # pylint: disable=deprecated-module
 
 def get_concurrency():
     def_concurrency = 2
+    max_concurrency = 16
 
     try:
         import multiprocessing
-        return multiprocessing.cpu_count()
+        return min(max_concurrency, multiprocessing.cpu_count())
     except ImportError:
         return def_concurrency