public static Range64[] PartitionByLength(long startIndex, long length, long maxPartitionLength)
{
if (maxPartitionLength < 1)
{
throw new ArgumentException("maxPartitionLength",
"Partitioning requires the maxPartitionLength to be greater than zero.");
}
if (length < 1)
{
throw new ArgumentException("length", "Partitioning requires the length to be greater than zero.");
}
if (length < maxPartitionLength)
{
throw new ArgumentException("length",
"Partitioning requires the length to be greater than maxPartitionLength.");
}
long rangeCount = length / maxPartitionLength;
long lastRangeLength = length % maxPartitionLength;
if (lastRangeLength > 0)
{
rangeCount++;
}
else
{
lastRangeLength = maxPartitionLength;
}
var ranges = new Range64[rangeCount];
for (long i = 0; i < rangeCount; i++)
{
long start = i * maxPartitionLength;
long end = (i == rangeCount - 1 ? start + lastRangeLength - 1 : start + maxPartitionLength - 1);
ranges[i] = new Range64(start, end);
start += maxPartitionLength;
}
return(ranges);
}
public static Range64[] Partition(long startIndex, long length, long numPartitions)
{
if (numPartitions < 1)
{
throw new ArgumentOutOfRangeException("count",
"Partitioning requires numPartitions to be greater than zero.");
}
if (length < 1)
{
throw new ArgumentOutOfRangeException("length", "Partitioning requires length to be greater than zero.");
}
if (length < numPartitions)
{
throw new InvalidOperationException(
"Partitioning cannot be performed when length is less than numPartitions requested.");
}
var ranges = new Range64[numPartitions];
long chunksize = length / numPartitions;
long remainder = length % numPartitions;
for (int i = 0; i < numPartitions; i++)
{
if (remainder > 0)
{
ranges[i] = new Range64(startIndex, startIndex + chunksize);
startIndex += chunksize + 1;
remainder--;
}
else
{
ranges[i] = new Range64(startIndex, startIndex + chunksize - 1);
startIndex += chunksize;
}
}
return(ranges);
}
public static Range64[] PartitionByLength(Range64 range, long maxPartitionLength)
{
return(PartitionByLength(range.StartIndex, range.Length, maxPartitionLength));
}
public static Range64[] Partition(Range64 range, long numPartitions)
{
return(Partition(range.StartIndex, range.Length, numPartitions));
}
public Block64(Range64 rowRange, Range64 colRange)
{
RowRange = rowRange;
ColumnRange = colRange;
}
