Sponsored Content
Top Forums UNIX for Advanced & Expert Users Process based code vs. Thread based code Post 302234055 by rkalyankumar on Tuesday 9th of September 2008 03:22:16 AM
Old 09-09-2008
MySQL Process based code vs. Thread based code

I am just wondering on which is the best way to write programs on UNIX. Which one is better from below:

a) Spawning threads per client connection/request?
b) fork-exec new processes per client connection/request?

Assume that I am doing some database system on linux which is supposed to run on unix systems as well.

The basic differences as I know are:

Using processes - have it's own address space, communicate using SysV/POSIX shared memory + semaphores etc & context switching is costly. Also implementing processes instead of threads is that process are more stable and reliable than threads. Just because if one thread malfunctions, the entire process would break.

On the other side, using thread the context switching is less cheaper compared to that of process context switches. No need for shared memory as the memory is shared and accessible by all threads with in the process & hence can avoid costly IPC mechanism's like SysV/POSIX shared memory and semaphores. Instead use simple mutexes and condition variables.

Being said all the above, I am still not in a position to decide up on which way to go i.e. use threads or use processes?

Please help.

Regards
Kalyan
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

server based Including additional code > Lycos way

For a project we need to make sure that all php / html files in a certain directory on the webserver are showing advertisments of us. For example, when you get a website from Lycos, you'll have an advertisement in the right corner. How to? As far as I can see, Lycos includes a javascript... (1 Reply)
Discussion started by: valentijnb
1 Replies

2. Shell Programming and Scripting

Need your HELP:: Shell script to detect paragraph in coordinate-based code.

Hi Friends!! I have obtained following output from a tool called pdftoxml: <xml> <text top="423" left="521" width="333" height="20" font="3">Although the the number of fuzzy rules of a system is </text> <text top="441" left="500" width="355" height="20" font="3">directly dependant on these... (2 Replies)
Discussion started by: parshant_bvcoe
2 Replies

3. Shell Programming and Scripting

restart process based on file

Hi all. I do have a script "startApp.sh" (app result is a file /opt/extract/appextract.txt) I have no problems with stopping app var1=`ps -ef | grep -v grep | grep MyApp | awk '{print $2}'` kill -9 $var1 What I want to achieve is: I start app, app is doing some extraction, after... (11 Replies)
Discussion started by: e-l-diablo
11 Replies

4. Shell Programming and Scripting

How to fetch rows based on line numbers or based on the beginning of a word?

I have a file which will have rows like shown below, ST*820*316054716 RMR*IV*11333331009*PO*40.31 REF*IV*22234441009*xsss471-2762 DTM*003*091016 ENT*000006 RMR*IV*2222234444*PO*239.91 REF*IV*1234445451009*LJhjlkhkj471-2762 </SPAN> DTM*003* 091016 RMR*IV*2223344441009*PO*40.31... (18 Replies)
Discussion started by: Muthuraj K
18 Replies

5. Shell Programming and Scripting

Running a process based on time

Hello All, My script is nearly complete, there is just one last piece that needs to be added in. I need to check for the time, and if it is lets say for example. Sunday at 5:00AM, my script cannot run. I would assume it would be something like this, parden the terrible pseudocode ... (7 Replies)
Discussion started by: jeffs42885
7 Replies

6. Shell Programming and Scripting

Script for running root based C++ code

Hi all, I have to run C++ file using root programming, using following commands: $root -l root .L TwoTrees.C++ root TwoTrees t root t.Loop() root.q I wonder if I can write script to do the following. Thanks Pooja (12 Replies)
Discussion started by: nrjrasaxena
12 Replies

7. Shell Programming and Scripting

Appending code in a directory recursively based on a certain criteria

i am stuck with this strange problem..... maybe you can help. i have one master_file which has two column username and id_number separated by , somewhat like : cat master_file : sample,1234567 javacode,4567891 companion,23456719 adamsandler,1237681 tomcruise,56328910 bradpitt,901236781... (9 Replies)
Discussion started by: mukulverma2408
9 Replies

8. UNIX for Dummies Questions & Answers

Condition based on Timestamp (Date/Time based) from logfile (Epoch seconds)

Below is the sample logfile: Userids Date Time acb Checkout time: 2013-11-20 17:00 axy Checkout time: 2013-11-22 12:00 der Checkout time: 2013-11-17 17:00 xyz Checkout time: 2013-11-19 16:00 ddd Checkout time: 2013-11-21 16:00 aaa Checkout... (9 Replies)
Discussion started by: asjaiswal
9 Replies

9. Shell Programming and Scripting

Code snippet to cut XML files based on record length

I want to do FTP an Huge XML file to mainframe server using AIX server Since my file size is huge, i want to split the XML file based on a delimiter , the record delimiter should be set after every 27000 bytes of data and then do the ftp This is done becos the data send to the mainframe must... (1 Reply)
Discussion started by: vishwanath001
1 Replies

10. Programming

C++ separate code based on the few changes

Hi, I am working in Visual studio 2008 in which i have written the code in c++,qml,qt.Its a simulator application. I would like to create a simulator with certain changes. In order to do that i have modified the code with few changes based on the preprocessor condition. #define... (4 Replies)
Discussion started by: SA_Palani
4 Replies
Server::Client(3pm)					User Contributed Perl Documentation				       Server::Client(3pm)

NAME
Net::SMTP::Server::Client - Client session handling for Net::SMTP::Server. SYNOPSIS
use Carp; use Net::SMTP::Server; use Net::SMTP::Server::Client; use Net::SMTP::Server::Relay; $server = new Net::SMTP::Server('localhost', 25) || croak("Unable to handle client connection: $! "); while($conn = $server->accept()) { # We can perform all sorts of checks here for spammers, ACLs, # and other useful stuff to check on a connection. # Handle the client's connection and spawn off a new parser. # This can/should be a fork() or a new thread, # but for simplicity... my $client = new Net::SMTP::Server::Client($conn) || croak("Unable to handle client connection: $! "); # Process the client. This command will block until # the connecting client completes the SMTP transaction. $client->process || next; # In this simple server, we're just relaying everything # to a server. If a real server were implemented, you # could save email to a file, or perform various other # actions on it here. my $relay = new Net::SMTP::Server::Relay($client->{FROM}, $client->{TO}, $client->{MSG}); } DESCRIPTION
The Net::SMTP::Server::Client module implements all the session handling required for a Net::SMTP::Server::Client connection. The above example demonstrates how to use Net::SMTP::Server::Client with Net::SMTP::Server to handle SMTP connections. $client = new Net::SMTP::Server::Client($conn) Net::SMTP::Server::Client accepts one argument that must be a handle to a connection that will be used for communication. Once you have a new client session, simply call: $client->process This processes an SMTP transaction. THIS MAY APPEAR TO HANG -- ESPECIALLY IF THERE IS A LARGE AMOUNT OF DATA BEING SENT. Once this method returns, the server will have processed an entire SMTP transaction, and is ready to continue. Once $client->process returns, various fields have been filled in. Those are: $client->{TO} -- This is an array containing the intended recipients for this message. There may be multiple recipients for any given message. $client->{FROM} -- This is the sender of the given message. $client->{MSG} -- The actual message data. :) AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>. ALL RIGHTS RESERVED. You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file. SEE ALSO
Net::SMTP::Server::Server, Net::SMTP::Server::Relay perl v5.10.1 1999-12-28 Server::Client(3pm)
All times are GMT -4. The time now is 07:52 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy