modifying benchmarks to reduce non-determinism (#3150)

Author: tlhunter

benchmark/sirun/log/index.js

@@ -4,7 +4,6 @@ const log = require('../../../packages/dd-trace/src/log')
 
 const {
   DD_TRACE_DEBUG = 'true',
-  ITERATIONS = 1000,
   WITH_LEVEL = 'debug'
 } = process.env
 
@@ -19,6 +18,6 @@ log.use({
   error () {}
 })
 
-for (let i = 0; i < ITERATIONS; i++) {
+for (let i = 0; i < 1000000; i++) {
   log[WITH_LEVEL](() => 'message')
 }

benchmark/sirun/log/meta.json

@@ -3,7 +3,7 @@
   "run": "node index.js",
   "run_with_affinity": "bash -c \"taskset -c $CPU_AFFINITY node index.js\"",
   "cachegrind": false,
-  "iterations": 190,
+  "iterations": 40,
   "instructions": true,
   "variants": {
     "without-log": { "env": { "DD_TRACE_DEBUG": "false" } },