[benchmark] Removed bogus Totals stats

Report only the total number of executed tests.

Aggregating MIN, MAX and MEAN values for all executed benchmarks together (with microsecond precision!) has no statistical relevance.

Author: palimondo

benchmark/utils/DriverUtils.swift

@@ -439,15 +439,15 @@ func printRunInfo(_ c: TestConfig) {
 }
 
 func runBenchmarks(_ c: TestConfig) {
-  var sumBenchResults = BenchResults()
-  sumBenchResults.sampleCount = 0
   let withUnit = {$0 + "(us)"}
   let header = (
     ["#", "TEST", "SAMPLES"] +
     ["MIN", "MAX", "MEAN", "SD", "MEDIAN"].map(withUnit)
   ).joined(separator: c.delim)
   print(header)
 
+  var testCount = 0
+
   for t in c.tests {
     guard let results = runBench(t, c) else {
       print("\(t.index)\(c.delim)\(t.name)\(c.delim)Unsupported")
@@ -457,18 +457,11 @@ func runBenchmarks(_ c: TestConfig) {
     print("\(t.index)\(c.delim)\(t.name)\(c.delim)\(results.description)")
     fflush(stdout)
 
-    sumBenchResults.min += results.min
-    sumBenchResults.max += results.max
-    sumBenchResults.mean += results.mean
-    sumBenchResults.sampleCount += 1
-    // Don't accumulate SD and Median, as simple sum isn't valid for them.
-    // TODO: Compute SD and Median for total results as well.
-    // sumBenchResults.sd += results.sd
-    // sumBenchResults.median += results.median
+    testCount += 1
   }
 
   print("")
-  print("Totals\(c.delim)\(sumBenchResults.description)")
+  print("Totals\(c.delim)\(testCount)")
 }
 
 public func main() {