namespace Microshaoft
{
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
class Program
{
static int[] bufsizes =
{
256,
320 * 240 * 3,
1024 * 768 * 3
};
static int bufsize;
const long duration = 10 * 1000 * 1000 * 10; // 10 seconds
static void Main(string[] args)
{
foreach (var b in bufsizes)
{
bufsize = b;
Console.WriteLine("allocs of size " + bufsize);
newbyte();
marshallallochglobal();
marshallAllocCoTaskMem();
stackallocate();
sharedmem();
Console.WriteLine("memcopies of size " + bufsize);
arraycopy();
BufferBlockCopy();
marshalcopy();
kernelcopy();
OwnMemCopyInt();
OwnMemCopyLong();
Console.WriteLine();
}
Console.WriteLine("done");
Console.ReadLine();
}
private static void BufferBlockCopy()
{
byte[] buf1 = new byte[bufsize];
byte[] buf2 = new byte[bufsize];
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
Buffer.BlockCopy(buf1, 0, buf2, 0, bufsize);
i++;
}
Console.WriteLine("Buffer.BlockCopy: " + i);
}
unsafe private static void marshalcopy()
{
byte[] buf1 = new byte[bufsize];
byte[] buf2 = new byte[bufsize];
long start = DateTime.UtcNow.Ticks;
int i = 0;
fixed (byte* b1 = &buf1[0])
fixed (byte* b2 = &buf2[0])
{
IntPtr ab2 = new IntPtr(b2);
while ((start + duration) > DateTime.UtcNow.Ticks)
{
Marshal.Copy(buf1, 0, ab2, buf1.Length);
i++;
}
}
Console.WriteLine("Marshal.Copy: " + i);
}
[DllImport("Kernel32.dll", EntryPoint = "RtlMoveMemory")]
public unsafe static extern void CopyMemory(byte* Destination, byte* Source, [MarshalAs(UnmanagedType.U4)] uint Length);
unsafe private static void kernelcopy()
{
Console.Write("Kernel32NativeMethods.CopyMemory: ");
byte[] buf1 = new byte[bufsize];
byte[] buf2 = new byte[bufsize];
long start = DateTime.UtcNow.Ticks;
int i = 0;
fixed (byte* b1 = &buf1[0])
fixed (byte* b2 = &buf2[0])
{
while ((start + duration) > DateTime.UtcNow.Ticks)
{
CopyMemory(b2, b1, (uint)buf1.Length);
i++;
}
}
Console.WriteLine(i);
}
unsafe private static void OwnMemCopyInt()
{
Console.Write("OwnMemCopyInt: ");
byte[] buf1 = new byte[bufsize];
byte[] buf2 = new byte[bufsize];
long start = DateTime.UtcNow.Ticks;
int i = 0;
fixed (byte* b1 = &buf1[0])
fixed (byte* b2 = &buf2[0])
{
IntPtr ab1 = new IntPtr(b1);
IntPtr ab2 = new IntPtr(b2);
while ((start + duration) > DateTime.UtcNow.Ticks)
{
MemCopyInt(ab1, ab2, buf1.Length);
i++;
}
}
Console.WriteLine(i);
}
unsafe private static void OwnMemCopyLong()
{
Console.Write("OwnMemCopyLong: ");
byte[] buf1 = new byte[bufsize];
byte[] buf2 = new byte[bufsize];
long start = DateTime.UtcNow.Ticks;
int i = 0;
fixed (byte * b1 = &buf1[0])
fixed (byte * b2 = &buf2[0])
{
IntPtr ab1 = new IntPtr(b1);
IntPtr ab2 = new IntPtr(b2);
while ((start + duration) > DateTime.UtcNow.Ticks)
{
MemCopyLong(ab1, ab2, buf1.Length);
i++;
}
}
Console.WriteLine(i);
}
private static void arraycopy()
{
Console.Write("Array.Copy: ");
byte[] buf1 = new byte[bufsize];
byte[] buf2 = new byte[bufsize];
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
Array.Copy(buf1, buf2, buf1.Length);
i++;
}
Console.WriteLine(i);
}
private static void newbyte()
{
Console.Write("new byte[]: ");
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
byte[] buf = new byte[bufsize];
i++;
}
//GC.Collect();
Console.WriteLine(i);
}
private static void marshallallochglobal()
{
Console.Write("Marshal.AllocHGlobal: ");
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
IntPtr p = Marshal.AllocHGlobal(bufsize);
Marshal.FreeHGlobal(p);
i++;
}
Console.WriteLine(i);
}
private static void marshallAllocCoTaskMem()
{
Console.Write("Marshal.AllocCoTaskMem: ");
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
IntPtr p = Marshal.AllocCoTaskMem(bufsize);
Marshal.FreeCoTaskMem(p);
i++;
}
Console.WriteLine(i);
}
private static void sharedmem()
{
try
{
Console.Write("SharedMemory: ");
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
using (SharedMemory m = new SharedMemory("abc", bufsize, true))
{
i++;
}
}
Console.WriteLine(i);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
private static void stackallocate()
{
Console.Write("stackalloc: ");
long start = DateTime.UtcNow.Ticks;
int i = 0;
while ((start + duration) > DateTime.UtcNow.Ticks)
{
stack();
i++;
}
Console.WriteLine(i);
}
unsafe static void stack()
{
byte* buf = stackalloc byte[bufsize];
}
static public unsafe void MemCopyInt(IntPtr pSource, IntPtr pDest, int Len)
{
unchecked
{
int count = Len / Marshal.SizeOf(typeof(int));
int rest = Len % count;
int* ps = (int*) pSource.ToPointer(), pd = (int*) pDest.ToPointer();
// Loop over the cnt in blocks of 4 bytes, copying an integer (4 bytes) at a time:
for (int n = 0; n < count; n++)
{
* pd++ = * ps++;
}
// Complete the copy by moving any bytes that weren't moved in blocks of 4:
if (rest > 0)
{
byte * ps1 = (byte*)ps;
byte * pd1 = (byte*)pd;
for (int n = 0; n < rest; n++)
{
*pd1++ = *ps1++;
}
}
}
}
static public unsafe void MemCopyLong(IntPtr pSource, IntPtr pDest, int Len)
{
unchecked
{
int count = Len / Marshal.SizeOf(typeof(long));
int rest = Len % count;
long* ps = (long*)pSource.ToPointer(), pd = (long*)pDest.ToPointer();
// Loop over the cnt in blocks of n bytes, copying an long (n bytes) at a time:
for (int n = 0; n < count; n++)
{
*pd++ = *ps++;
}
// Complete the copy by moving any bytes that weren't moved in blocks of n:
if (rest > 0)
{
byte* ps1 = (byte*) ps;
byte* pd1 = (byte*) pd;
for (int n = 0; n < rest; n++)
{
* pd1 = * ps1;
pd1++;
ps1++;
}
}
}
}
}
unsafe public class SharedMemory : IDisposable
{
[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr CreateFileMapping(IntPtr hFile, IntPtr lpFileMappingAttributes, PageProtection flProtect, uint dwMaximumSizeHigh, uint dwMaximumSizeLow, string lpName);
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CloseHandle(IntPtr hObject);
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool UnmapViewOfFile(IntPtr lpBaseAddress);
[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr MapViewOfFile(IntPtr hFileMappingObject, uint dwDesiredAccess, uint dwFileOffsetHigh, uint dwFileOffsetLow, IntPtr dwNumberOfBytesToMap);
[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr OpenFileMapping(uint dwDesiredAccess, bool bInheritHandle, string lpName);
const UInt32 STANDARD_RIGHTS_REQUIRED = 0x000F0000;
const UInt32 SECTION_QUERY = 0x0001;
const UInt32 SECTION_MAP_WRITE = 0x0002;
const UInt32 SECTION_MAP_READ = 0x0004;
const UInt32 SECTION_MAP_EXECUTE = 0x0008;
const UInt32 SECTION_EXTEND_SIZE = 0x0010;
const UInt32 SECTION_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_WRITE | SECTION_MAP_READ | SECTION_MAP_EXECUTE | SECTION_EXTEND_SIZE);
const UInt32 FILE_MAP_ALL_ACCESS = SECTION_ALL_ACCESS;
[Flags]
enum PageProtection : uint
{
NoAccess = 0x01,
Readonly = 0x02,
ReadWrite = 0x04,
WriteCopy = 0x08,
Execute = 0x10,
ExecuteRead = 0x20,
ExecuteReadWrite = 0x40,
ExecuteWriteCopy = 0x80,
Guard = 0x100,
NoCache = 0x200,
WriteCombine = 0x400,
}
private IntPtr hHandle;
public void * Buffer
{
get;
private set;
}
public int Length { get; private set; }
public SharedMemory(string name, int size, bool create)
{
if (create)
{
Create(name, size);
}
else
{
Attach(name);
}
}
~SharedMemory()
{
Detach();
}
private void Create(string SharedMemoryName, int NumBytes)
{
hHandle = CreateFileMapping(new IntPtr(-1), IntPtr.Zero, PageProtection.ReadWrite, 0, (uint)NumBytes, SharedMemoryName);
if (IntPtr.Zero == hHandle)
{
throw new InvalidOperationException(String.Format("Failed to create FileMapping with given name '{0}'.", SharedMemoryName));
}
Buffer = MapViewOfFile(hHandle, FILE_MAP_ALL_ACCESS, 0, 0, IntPtr.Zero).ToPointer();
Length = NumBytes;
}
private void Attach(string SharedMemoryName)
{
hHandle = OpenFileMapping(FILE_MAP_ALL_ACCESS, false, SharedMemoryName);
if (IntPtr.Zero == hHandle)
{
throw new InvalidOperationException(String.Format("Failed to open FileMapping with given name '{0}'.", SharedMemoryName));
}
Buffer = MapViewOfFile(hHandle, FILE_MAP_ALL_ACCESS, 0, 0, IntPtr.Zero).ToPointer();
}
private void Detach()
{
if (IntPtr.Zero != hHandle)
{
UnmapViewOfFile(new IntPtr(Buffer));
CloseHandle(hHandle); //fair to leak if can't close
hHandle = IntPtr.Zero;
}
Buffer = IntPtr.Zero.ToPointer();
}
#region IDisposable Members
public void Dispose()
{
Detach();
}
#endregion
}
}
