Capture the number of OS context switches

UO-OACISS · Jun 27, 2020 · 7dab89c · 7dab89c
1 parent d3e1886
commit 7dab89c
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/src/apex/proc_read.cpp b/src/apex/proc_read.cpp
@@ -789,6 +789,7 @@ namespace apex {
         FILE *f = fopen("/proc/self/status", "r");
         const std::string vm_prefix("Vm");
         const std::string thread_prefix("Threads");
+        const std::string ctx_substr("ctxt_switches");
         if (f) {
             char line[4096] = {0};
             while ( fgets( line, 4096, f)) {
@@ -821,6 +822,20 @@ namespace apex {
                         if (pEnd) { sample_value(mname, d1); }
                     }
                 }
+                if (tmp.find(ctx_substr) != tmp.npos) {
+                    const REGEX_NAMESPACE::regex separator(":");
+                    REGEX_NAMESPACE::sregex_token_iterator token(tmp.begin(),
+                            tmp.end(), separator, -1);
+                    REGEX_NAMESPACE::sregex_token_iterator end;
+                    string name = *token++;
+                    if (token != end) {
+                        string value = *token;
+                        char* pEnd;
+                        double d1 = strtod (value.c_str(), &pEnd);
+                        string mname("status:" + name);
+                        if (pEnd) { sample_value(mname, d1); }
+                    }
+                }
             }
             fclose(f);
         } else {