SERVER-25182 Add metric for number of CPUs

(cherry picked from commit fec78bf6245be7e45ddc599bb78396eb5f8847c6)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mongo/db/ftdc/ftdc_system_stats_linux.cpp b/src/mongo/db/ftdc/ftdc_system_stats_linux.cpp
index dafc9f77a8c..5ed3c6e89ba 100644
--- a/src/mongo/db/ftdc/ftdc_system_stats_linux.cpp
+++ b/src/mongo/db/ftdc/ftdc_system_stats_linux.cpp
@@ -39,6 +39,7 @@
 #include "mongo/db/ftdc/collector.h"
 #include "mongo/db/ftdc/controller.h"
 #include "mongo/stdx/memory.h"
+#include "mongo/util/processinfo.h"
 #include "mongo/util/procparser.h"
 
 namespace mongo {
@@ -79,6 +80,11 @@ public:
     void collect(OperationContext* txn, BSONObjBuilder& builder) override {
         {
             BSONObjBuilder subObjBuilder(builder.subobjStart("cpu"));
+
+            // Include the number of cpus to simplify client calculations
+            ProcessInfo p;
+            subObjBuilder.append("num_cpus", p.getNumCores());
+
             processStatusErrors(
                 procparser::parseProcStatFile("/proc/stat", kCpuKeys, &subObjBuilder),
                 &subObjBuilder);