Class RamUsageEstimator
Estimates the size (memory representation) of .NET objects.
This is a Lucene.NET INTERNAL API, use at your own risk
Inheritance
System.Object
RamUsageEstimator
Assembly: Lucene.Net.dll
Syntax
public sealed class RamUsageEstimator : object
Fields
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Number of bytes to represent an array header (no content, but with alignments).
Declaration
public static readonly int NUM_BYTES_ARRAY_HEADER
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_BOOLEAN
Declaration
public const int NUM_BYTES_BOOLEAN = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_BYTE
Declaration
public const int NUM_BYTES_BYTE = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_CHAR
Declaration
public const int NUM_BYTES_CHAR = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_DOUBLE
Declaration
public const int NUM_BYTES_DOUBLE = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_INT16
NOTE: This was NUM_BYTES_SHORT in Lucene
Declaration
public const int NUM_BYTES_INT16 = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_INT32
NOTE: This was NUM_BYTES_INT in Lucene
Declaration
public const int NUM_BYTES_INT32 = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_INT64
NOTE: This was NUM_BYTES_LONG in Lucene
Declaration
public const int NUM_BYTES_INT64 = null
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_OBJECT_ALIGNMENT
A constant specifying the object alignment boundary inside the .NET runtime. Objects will
always take a full multiple of this constant, possibly wasting some space.
Declaration
public static readonly int NUM_BYTES_OBJECT_ALIGNMENT
Field Value
| Type |
Description |
| System.Int32 |
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Number of bytes to represent an object header (no fields, no alignments).
Declaration
public static readonly int NUM_BYTES_OBJECT_HEADER
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_OBJECT_REF
Number of bytes this .NET runtime uses to represent an object reference.
Declaration
public static readonly int NUM_BYTES_OBJECT_REF
Field Value
| Type |
Description |
| System.Int32 |
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NUM_BYTES_SINGLE
NOTE: This was NUM_BYTES_FLOAT in Lucene
Declaration
public const int NUM_BYTES_SINGLE = null
Field Value
| Type |
Description |
| System.Int32 |
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ONE_GB
Declaration
public const long ONE_GB = null
Field Value
| Type |
Description |
| System.Int64 |
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ONE_KB
Declaration
public const long ONE_KB = null
Field Value
| Type |
Description |
| System.Int64 |
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ONE_MB
Declaration
public const long ONE_MB = null
Field Value
| Type |
Description |
| System.Int64 |
|
Methods
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AlignObjectSize(Int64)
Declaration
public static long AlignObjectSize(long size)
Parameters
| Type |
Name |
Description |
| System.Int64 |
size |
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Returns
| Type |
Description |
| System.Int64 |
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HumanReadableUnits(Int64)
Returns size in human-readable units (GB, MB, KB or bytes).
Declaration
public static string HumanReadableUnits(long bytes)
Parameters
| Type |
Name |
Description |
| System.Int64 |
bytes |
|
Returns
| Type |
Description |
| System.String |
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Returns size in human-readable units (GB, MB, KB or bytes).
Declaration
public static string HumanReadableUnits(long bytes, IFormatProvider df)
Parameters
| Type |
Name |
Description |
| System.Int64 |
bytes |
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| IFormatProvider |
df |
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Returns
| Type |
Description |
| System.String |
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HumanSizeOf(Object)
Return a human-readable size of a given object.
Declaration
public static string HumanSizeOf(object object)
Parameters
| Type |
Name |
Description |
| System.Object |
object |
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Returns
| Type |
Description |
| System.String |
|
See Also
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Return a human-readable size of a given object.
Declaration
public static string HumanSizeOf(object object, IFormatProvider df)
Parameters
| Type |
Name |
Description |
| System.Object |
object |
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| IFormatProvider |
df |
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Returns
| Type |
Description |
| System.String |
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ShallowSizeOf(Object)
Estimates a "shallow" memory usage of the given object. For arrays, this will be the
memory taken by array storage (no subreferences will be followed). For objects, this
will be the memory taken by the fields.
.NET object alignments are also applied.
Declaration
public static long ShallowSizeOf(object obj)
Parameters
| Type |
Name |
Description |
| System.Object |
obj |
|
Returns
| Type |
Description |
| System.Int64 |
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ShallowSizeOfInstance(Type)
Returns the shallow instance size in bytes an instance of the given class would occupy.
This works with all conventional classes and primitive types, but not with arrays
(the size then depends on the number of elements and varies from object to object).
Declaration
public static long ShallowSizeOfInstance(Type clazz)
Parameters
| Type |
Name |
Description |
| Type |
clazz |
|
Returns
| Type |
Description |
| System.Int64 |
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See Also
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SizeOf(Boolean[])
Returns the size in bytes of the bool[] object.
Declaration
public static long SizeOf(bool[] arr)
Parameters
| Type |
Name |
Description |
| System.Boolean[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Byte[])
Returns the size in bytes of the byte[] object.
Declaration
public static long SizeOf(byte[] arr)
Parameters
| Type |
Name |
Description |
| System.Byte[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Char[])
Returns the size in bytes of the char[] object.
Declaration
public static long SizeOf(char[] arr)
Parameters
| Type |
Name |
Description |
| System.Char[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Double[])
Returns the size in bytes of the double[] object.
Declaration
public static long SizeOf(double[] arr)
Parameters
| Type |
Name |
Description |
| System.Double[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Int16[])
Returns the size in bytes of the short[] object.
Declaration
public static long SizeOf(short[] arr)
Parameters
| Type |
Name |
Description |
| System.Int16[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Int32[])
Returns the size in bytes of the int[] object.
Declaration
public static long SizeOf(int[] arr)
Parameters
| Type |
Name |
Description |
| System.Int32[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Int64[])
Returns the size in bytes of the long[] object.
Declaration
public static long SizeOf(long[] arr)
Parameters
| Type |
Name |
Description |
| System.Int64[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Object)
Estimates the RAM usage by the given object. It will
walk the object tree and sum up all referenced objects.
Resource Usage: this method internally uses a set of
every object seen during traversals so it does allocate memory
(it isn't side-effect free). After the method exits, this memory
should be GCed.
Declaration
public static long SizeOf(object obj)
Parameters
| Type |
Name |
Description |
| System.Object |
obj |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(SByte[])
Returns the size in bytes of the sbyte[] object.
Declaration
public static long SizeOf(sbyte[] arr)
Parameters
| Type |
Name |
Description |
| System.SByte[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(Single[])
Returns the size in bytes of the float[] object.
Declaration
public static long SizeOf(float[] arr)
Parameters
| Type |
Name |
Description |
| System.Single[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(UInt16[])
Returns the size in bytes of the ushort[] object.
Declaration
public static long SizeOf(ushort[] arr)
Parameters
| Type |
Name |
Description |
| System.UInt16[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
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SizeOf(UInt32[])
Returns the size in bytes of the uint[] object.
Declaration
public static long SizeOf(uint[] arr)
Parameters
| Type |
Name |
Description |
| System.UInt32[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
|
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SizeOf(UInt64[])
Returns the size in bytes of the ulong[] object.
Declaration
public static long SizeOf(ulong[] arr)
Parameters
| Type |
Name |
Description |
| System.UInt64[] |
arr |
|
Returns
| Type |
Description |
| System.Int64 |
|
See Also