Initial build capability supporting benchmark creation.

Signed-off-by: Simeon H.K. fitch <fitch@astraea.io>

bench/README.md

@@ -0,0 +1,9 @@
+# GeoTrellis Performance Benchmarking
+
+To run from project root directory:
+
+```
+sbt bench/bench
+```
+
+Results will be in `bench/target/jmh-results-<datestamp>.csv`.

bench/build.sbt

@@ -0,0 +1,27 @@
+import java.text.SimpleDateFormat
+import java.util.Date
+
+import scala.util.matching.Regex
+
+enablePlugins(JmhPlugin)
+
+val jmhOutputFormat = settingKey[String]("Output format: {text|csv|scsv|json|latex}")
+jmhOutputFormat := "csv"
+
+val jmhFileRegex = settingKey[Regex]("Filename regular expression for selecting files to benchmark")
+jmhFileRegex := ".*Bench.*".r
+
+val jmhRun = Def.taskDyn {
+  val rf = jmhOutputFormat.value
+  def timestamp = new SimpleDateFormat("yyyyMMdd").format(new Date())
+  val rff = target.value / s"jmh-results-$timestamp.${jmhOutputFormat.value}"
+  val pat = jmhFileRegex.value.toString
+
+  val args = s" -rf $rf -rff $rff $pat"
+  (run in Jmh).toTask(args)
+}
+
+val bench = taskKey[Unit]("Run JMH")
+bench := jmhRun.value
+
+

bench/src/main/scala/geotrellis/spark/io/index/MergeQueueBench.scala

@@ -0,0 +1,24 @@
+package geotrellis.spark.io.index
+
+
+import java.util.concurrent.TimeUnit
+import org.openjdk.jmh.annotations._
+
+@BenchmarkMode(Array(Mode.AverageTime))
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@Warmup(iterations = 5)
+@Measurement(iterations = 10)
+@Fork(1)
+@Threads(1)
+@State(Scope.Thread)
+class MergeQueueBench {
+  val queue = new MergeQueue()
+
+  @Benchmark
+  def mergeOrderedDense  = {
+    for(i ← -10000 to 10000) {
+      queue += (i, i + 10)
+    }
+    queue
+  }
+}

build.sbt

@@ -235,3 +235,7 @@ lazy val util = project
 lazy val `doc-examples` = project
   .dependsOn(spark, s3, accumulo, cassandra, hbase, spark, `spark-testkit`)
   .settings(commonSettings)
+
+lazy val bench = project
+  .dependsOn(spark)
+  .settings(commonSettings)

project/build.properties

@@ -1 +1 @@
-sbt.version=0.13.15
+sbt.version=0.13.16

project/plugins.sbt

@@ -16,3 +16,5 @@ addSbtPlugin("me.lessis" % "ls-sbt" % "0.1.3")
 addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.3.0")
 
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "1.7.0")
+
+addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.2.27")