Do not check MaxNumThreadsAvailable if the thread number is set to 1.
- this saves the sysfs cost in MaxNumThreadsAvailable.
Change-Id: I6b33ceae363da19346341be95abbd89d7b7b0f2f
diff --git a/internal/ceres/preprocessor.cc b/internal/ceres/preprocessor.cc
index 6a67d38..cd8c48c 100644
--- a/internal/ceres/preprocessor.cc
+++ b/internal/ceres/preprocessor.cc
@@ -57,6 +57,9 @@
Preprocessor::~Preprocessor() {}
void ChangeNumThreadsIfNeeded(Solver::Options* options) {
+ if (options->num_threads == 1) {
+ return;
+ }
const int num_threads_available = MaxNumThreadsAvailable();
if (options->num_threads > num_threads_available) {
LOG(WARNING) << "Specified options.num_threads: " << options->num_threads
