Add multithreaded generation of measurements file with Gaussian distribution (M2 AIR took 24 seconds for 1B items) (#175)

* Add multithreaded variant to generate measurements

* Add removing existing measurements.txt file in case exists (for usability reasons)
Fix bug for number of lines generated

* Fix also for less than assumed chunk size (10M entries) per thread

1 files changed, 19 insertions, 0 deletions

diff --git a/create_measurements_fast.sh b/create_measurements_fast.sh
new file mode 100755
index 0000000..37e98e0
--- /dev/null
+++ b/create_measurements_fast.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+#  Copyright 2023 The original authors
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+
+java --class-path target/average-1.0.0-SNAPSHOT.jar dev.morling.onebrc.CreateMeasurementsFast $1