First attempt to automate my benchmark

benchmarks/bench_report.lua

@@ -0,0 +1,49 @@
+function sysbench.report_json(stat)
+   if not gobj then
+      io.write('[\n')
+      -- hack to print the closing bracket when the Lua state of the reporting
+      -- thread is closed
+      gobj = newproxy(true)
+      getmetatable(gobj).__gc = function () io.write('\n]\n') end
+   else
+      io.write(',\n')
+   end
+
+   local seconds = stat.time_interval
+   io.write(([[
+  {
+    "time": %4.0f,
+    "threads": %u,
+    "transactions": %u,
+    "queries": {
+       "total": %u,
+       "reads": %u,
+       "writes": %u,
+       "other": %u
+    },
+    "tps": %4.2f,
+    "qps": {
+      "total": %4.2f,
+      "reads": %4.2f,
+      "writes": %4.2f,
+      "other": %4.2f
+    },
+    "latency": %4.2f,
+    "errors": %4.2f,
+    "reconnects": %4.2f
+  }]]):format(
+            stat.time_total,
+            stat.threads_running,
+            stat.events,
+            stat.reads + stat.writes + stat.other,
+            stat.reads, stat.writes, stat.other,
+            stat.events / seconds,
+            (stat.reads + stat.writes + stat.other) / seconds,
+            stat.reads / seconds,
+            stat.writes / seconds,
+            stat.other / seconds,
+            stat.latency_pct * 1000,
+            stat.errors / seconds,
+            stat.reconnects / seconds
+   ))
+end