static void Main2() {
byte[] buffer = new byte[BUFFER_SIZE];
int start, duration;
AutoResetEvent turn = new AutoResetEvent(false);
//
// Open the file.
//
/*
FileStream fs = new FileStream(filePath, FileMode.Open,
FileAccess.Read, FileShare.None, BUFFER_SIZE,
AsyncAccess);
*/
SimpleFileStream fs = new SimpleFileStream(filePath, AsyncAccess);
int fileCount = 0;
Console.WriteLine("+++start reading the file");
start = Environment.TickCount;
//
// Define the callback method.
//
AsyncCallback rdcb = null;
rdcb = delegate (IAsyncResult ar) {
int bytesRead = 0;
try {
bytesRead = fs.EndRead(ar);
if (bytesRead != 0) {
fs.BeginRead(buffer, 0, buffer.Length, rdcb, null);
} else {
fileCount++;
turn.Set();
}
} catch (IOException ioex) {
Console.WriteLine("*** " + ioex.Message);
turn.Set();
}
};
for (int i = 0; i < REPEAT_COUNT; i++) {
Console.Write("--pass: {0}\r", i);
fs.Seek(0L, SeekOrigin.Begin);
fs.BeginRead(buffer, 0, buffer.Length, rdcb, null);
turn.WaitOne();
}
duration = Environment.TickCount - start;
int chunks = (int)((fs.Length * fileCount) / BUFFER_SIZE);
fs.Close();
Console.WriteLine("---average cost of reading {0}K bytes from a local file: {1:0.0} us",
BUFFER_SIZE / 1024, (duration * 1000.0) / chunks);
}
static void Main() {
byte[] buffer = new byte[BUFFER_SIZE];
int start, duration, fileCount = 0;
/*
FileStream fs = new FileStream(filePath, FileMode.Open,
FileAccess.Read, FileShare.None, BUFFER_SIZE,
AsyncAccess);
*/
SimpleFileStream fs = new SimpleFileStream(filePath, AsyncAccess);
Console.WriteLine("+++start reading the file");
start = Environment.TickCount;
for (int i = 0; i < REPEAT_COUNT; i++) {
Console.Write("--pass: {0}\r", i + 1);
fs.Seek(0L, SeekOrigin.Begin);
while (fs.Read(buffer, 0, buffer.Length) != 0) {
fileCount++;
}
}
duration = Environment.TickCount - start;
int chunks = (int)((fs.Length * fileCount) / BUFFER_SIZE);
fs.Close();
Console.WriteLine("\n---average cost of reading {0}K bytes from a local file: {1:0.0} ns",
BUFFER_SIZE/1024, (duration * 1000000.0) / chunks);
}
