fix: set @fork(value = 5) as a sane default

closes pgjdbc/pgjdbc#1214

Author: vlsi

src/main/java/org/postgresql/benchmark/encoding/UTF8Decoding.java

@@ -36,7 +36,7 @@
 /**
  * Tests the performance of UTF-8 decoding. UTF-8 is used a lot, so we need to know the performance
  */
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/encoding/UTF8Encoding.java

@@ -35,7 +35,7 @@
 /**
  * Tests the performance of UTF-8 encoding. UTF-8 is used a lot, so we need to know the performance
  */
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/BindArray.java

@@ -37,7 +37,7 @@
 import java.util.Properties;
 import java.util.concurrent.TimeUnit;
 
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/BindBoolean.java

@@ -35,7 +35,7 @@
 import java.util.Properties;
 import java.util.concurrent.TimeUnit;
 
-@Fork(value = 0, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/BindTimestamp.java

@@ -37,7 +37,7 @@
 import java.util.TimeZone;
 import java.util.concurrent.TimeUnit;
 
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/FinalizeStatement.java

@@ -47,7 +47,7 @@
  * <blockquote> <code>java -classpath postgresql-driver.jar:target/benchmarks.jar -prof gc -f 1 -wi
  * 10 -i 10</code> </blockquote>
  */
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/InsertBatch.java

@@ -40,7 +40,7 @@
 import java.util.Properties;
 import java.util.concurrent.TimeUnit;
 
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/ParseStatement.java

@@ -40,7 +40,7 @@
  * Tests the performance of preparing, executing and performing a fetch out of a simple "SELECT ?,
  * ?, ... ?" statement.
  */
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/ProcessBoolean.java

@@ -40,7 +40,7 @@
  *
  * @author jorsol
  */
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)

src/main/java/org/postgresql/benchmark/statement/ProcessResultSet.java

@@ -40,7 +40,7 @@
  * Tests the performance of preparing, executing and performing a fetch out of a simple "SELECT ?,
  * ?, ... ?" statement.
  */
-@Fork(value = 1, jvmArgsPrepend = "-Xmx128m")
+@Fork(value = 5, jvmArgsPrepend = "-Xmx128m")
 @Measurement(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @Warmup(iterations = 10, time = 1, timeUnit = TimeUnit.SECONDS)
 @State(Scope.Thread)