java - Socket performance on linux -

-

From my last query, the following:

I see linux Socket display with the above example I get round travel time of ~ 65μsec. If I do two fees on file system then it goes down to ~ 45μsec, should be extra time using localhost sockets because I hit network stack I am here.

Is there an OS configuration that can fasten the local host socket as a named pipe? 

  uname -a Linux fiatpap1d 2.4.21-63.ELhugemem # 1 SMP Mercury Oct 28 23:12:58 EDT 2009 i686 Athlon i386 GNU / Linux
< P> Thanks advance!

With the above example, I get round travel time of 65 μsec i if i file If I make two fees on the system then it goes down to ~ 45μsec, it should be extra time using localhost sockets because I'm killing a network stack.

Yes, and it should be expected.

FIFO, rather the initial communication method His state is essentially a bool variable reads and writes, like fixed size, go through pre-allocated buffer. Thus OS can optimize operation.

Sockets are more complex than the state machine of their full TCP, buffering is dynamic and bidirectional (resend, send buffer separately). This means that when you write something in the local socket, you have some kind of dynamic memory management that Linux tries to avoid as much as possible: zero-copy / single-copy is applied everywhere . Yet, obviously, because the call has to go through more code, they become slower.

Finally, compared to more SOCKS than FIFO, 20us difference is clearly the performance of Linux sockets.

PS uses a single connection without optimization for network code of 65us rtt = ~ 35us 1 s / 35us = ~ 30 per second in seconds, which seems right about.


Comments

Post a Comment

Popular posts from this blog

c# - sqlDecimal to decimal clr stored procedure Unable to cast object of type 'System.Data.SqlTypes.SqlDecimal' to type 'System.IConvertible' -

-
I'm new to this I'm writing a clr. stored procedure that can be used to get values ​​used in a calculation Call for another stored procedure for Gives an archived methodology int (I think SqlInt32? Value of the table's value is int) which is then necessary to convert to decimal. Here I have the code: Public static integral mood (SQL MDMMYLUE, escalistering AMY type, out of SQLDCM Result) {aResult = 0; Try {SqlConnection conn = New SqlConnection ("Reference Connection = True"); SqlCommand cmd = New SqlCommand ("sp_GetType", conn); Cmd.Parameters.AddWithValue ("@ myValueType", aMyValueType); Cmd.CommandType = CommandType.StoredProcedure; Conn.Open (); Object type = CMD. Exclamation Asser (); Conn.Close (); Decimal type FORCalculation = Convert. ToDecimal (type); Decimal value = convert toDecimal (aMyValue); // ** calculation calc = new calculation (); Decimal result = calorie.docalulation (typefarculation, value); I get an exception...
Read more

Calling GetGUIThreadInfo from Outlook VBA -

-
I need to find the active window'm writing a VBA macro in MS Outlook, which is a specific process. The goal of this is to get the active window / document name even if its original application has more than one document interface. User processor with GetCurrentThreadId is active, I am using GetGUIThreadInfo to get .dll. Here is the correct code: private type RECT as as Left LongPtr top LongPtr right LongPtr down LongPtr termination of private type GUITHREADINFO cbSize as LongPtr flags LongPtr hwndActive LongPtr hwndFocus LongPtr hwndCapture LongPtr as as as as as reset as LongPtr rcCaret as LongPtr hwndCreate as LongPtr hwndMoveSize as HwndMenuOwner end of Private Equity PtrSafe function GetWindowThreadProcessId Lib "user32" (_BVV hnw LongPtr as LongPtr Nig Mr. announced as PtrSafe function GetGUIThreadInfo Lib "user32" _ (ByVal dwthreadid as LongPtr, _ lpguithreadinfo as GUITHREADINFO) LongPtr Sub MyFunction () as dim strWindowTitle string = space as s...
Read more

Obfuscating Python code? -

-
I'm looking for a way to hide my Python source code. print "Hello World!" How can I encode this example so that it is not human-readable? I have been asked to use Base 64 but I'm not sure how. itemprop = "text"> It is limited only, first level ambiguous resolution, but has built-in: byte-code in Python Is a compiler for: dragon-o-m py_compile & lt; Your program.py & gt; creates a .pyo file with a byte-code, and where the docstrings are removed, etc. You can rename .pyo with the .py extension, and python & lt; Your program.py & gt; runs as your program, but it does not have your source code. PS : If your program blur modules like this, you need to rename them with the .pyc suffix (I Not sure it will not break a day), or you can work with .pyo and run them with python -o ... .pyo ( Import should work). This will allow dragon to search your modules (otherwise, Python looks for the .py module).
Read more