/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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.
*/
package com.linkedin.pinot.core.util;
/**
* Util class to encapsulate all math required to compute storage space.
*/
public class SizeUtil {
public static int BIT_UNPACK_BATCH_SIZE = 32;
public static int computeBytesRequired(int numValues, int numBits, int entriesPerBatch) {
int bitsRequiredPerBatch = entriesPerBatch * numBits;
//Align to batch boundary to avoid if checks while reading
int totalBitsRounded = (int) (Math.ceil((numValues * numBits * 1.0) / bitsRequiredPerBatch)
* bitsRequiredPerBatch);
return totalBitsRounded / 8;
}
}