fallback method for cpu freq through register access

src/tool.c

@@ -612,6 +612,37 @@ HIDDEN void get_rand_postfix(char *postfix, int size)
 }
 
 #ifdef INTEL
+HIDDEN void brandString(int *a)
+{
+    __asm__("mov $0x80000004 , %eax\n\t");
+    __asm__("cpuid\n\t");
+    __asm__("mov %%eax, %0\n\t":"=r" (a[0]));
+    __asm__("mov %%ebx, %0\n\t":"=r" (a[1]));
+    __asm__("mov %%ecx, %0\n\t":"=r" (a[2]));
+    __asm__("mov %%edx, %0\n\t":"=r" (a[3]));
+}
+
+HIDDEN float getCpuFreq()
+{
+    int a[10];
+    char *token;
+    float nom_freq = 0.0;
+
+    __asm__("xor %eax , %eax\n\t");
+    __asm__("xor %ebx , %ebx\n\t");
+    __asm__("xor %ecx , %ecx\n\t");
+    __asm__("xor %edx , %edx\n\t");
+
+    brandString(a);
+
+    token = strtok((char*)&a[0],"@");
+    token = strtok(NULL, "@");
+    sscanf(token, "%fGHz", &nom_freq);
+    nom_freq *= 1000;
+
+    return nom_freq;
+}
+
 HIDDEN int read_intel_nom_freq()
 {
 	FILE *fd;
@@ -639,12 +670,8 @@ HIDDEN int read_intel_nom_freq()
 			free(line);
 			fclose(fd);
 			nom_freq *= 1000;
-		} else {
-			fprintf(stderr,
-				"Error: <COUNTDOWN-node:%s-rank:%d> Failed to read file: /proc/cpuinfo\n",
-				cntd->node.hostname, cntd->rank->world_rank);
-			PMPI_Abort(MPI_COMM_WORLD, EXIT_FAILURE);
-		}
+		} else 
+			nom_freq = getCpuFreq();
 	}
 	return (int)(nom_freq);
 }