Add elapsed and start time to json summary output

src/main/java/com/oltpbenchmark/Results.java

@@ -28,6 +28,7 @@
 
 public final class Results {
 
+    private final long start_ts;
     private final long nanoseconds;
     private final int measuredRequests;
     private final DistributionStatistics distributionStatistics;
@@ -40,8 +41,9 @@ public final class Results {
     private final Histogram<TransactionType> retryDifferent = new Histogram<>(false);
     private final Map<TransactionType, Histogram<String>> abortMessages = new HashMap<>();
 
-    public Results(long nanoseconds, int measuredRequests, DistributionStatistics distributionStatistics, final List<LatencyRecord.Sample> latencySamples) {
-        this.nanoseconds = nanoseconds;
+    public Results(long start_ts, long elapsed_nanoseconds, int measuredRequests, DistributionStatistics distributionStatistics, final List<LatencyRecord.Sample> latencySamples) {
+        this.start_ts = start_ts;
+        this.nanoseconds = elapsed_nanoseconds;
         this.measuredRequests = measuredRequests;
         this.distributionStatistics = distributionStatistics;
 
@@ -98,6 +100,10 @@ public List<Sample> getLatencySamples() {
         return latencySamples;
     }
 
+    public long getStartTs() {
+        return start_ts;
+    }
+
     public long getNanoseconds() {
         return nanoseconds;
     }

src/main/java/com/oltpbenchmark/ThreadBench.java

@@ -113,6 +113,7 @@ private Results runRateLimitedMultiPhase() {
 
         // long measureStart = start;
 
+        long start_ts = System.currentTimeMillis();
         long start = System.nanoTime();
         long warmupStart = System.nanoTime();
         long warmup = warmupStart;
@@ -314,7 +315,7 @@ private Results runRateLimitedMultiPhase() {
             }
             DistributionStatistics stats = DistributionStatistics.computeStatistics(latencies);
 
-            Results results = new Results(measureEnd - start, requests, stats, samples);
+            Results results = new Results(start_ts, measureEnd - start, requests, stats, samples);
 
             // Compute transaction histogram
             Set<TransactionType> txnTypes = new HashSet<>();

src/main/java/com/oltpbenchmark/util/ResultWriter.java

@@ -99,19 +99,21 @@ public void writeConfig(PrintStream os) throws ConfigurationException {
     }
 
     public void writeSummary(PrintStream os) {
-        Map<String, Object> summaryMap = new TreeMap<>();
+        Map<String, Object> summaryMap = new LinkedHashMap<>();
         TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
         Date now = new Date();
+        summaryMap.put("Start timestamp (milliseconds)", results.getStartTs());
         summaryMap.put("Current Timestamp (milliseconds)", now.getTime());
+        summaryMap.put("Elapsed Time (nanoseconds)", results.getNanoseconds());
         summaryMap.put("DBMS Type", dbType);
         summaryMap.put("DBMS Version", collector.collectVersion());
         summaryMap.put("Benchmark Type", benchType);
-        summaryMap.put("Latency Distribution", results.getDistributionStatistics().toMap());
-        summaryMap.put("Throughput (requests/second)", results.requestsPerSecondThroughput());
-        summaryMap.put("Goodput (requests/second)", results.requestsPerSecondGoodput());
         for (String field : BENCHMARK_KEY_FIELD) {
             summaryMap.put(field, expConf.getString(field));
         }
+        summaryMap.put("Latency Distribution", results.getDistributionStatistics().toMap());
+        summaryMap.put("Throughput (requests/second)", results.requestsPerSecondThroughput());
+        summaryMap.put("Goodput (requests/second)", results.requestsPerSecondGoodput());
         os.println(JSONUtil.format(JSONUtil.toJSONString(summaryMap)));
     }