Ideas Please (File Sequencing) Post: 302145264

Sponsored Content

Top Forums Programming Ideas Please (File Sequencing) Post 302145264 by bcpkvh on Tuesday 13th of November 2007 02:20:26 PM

11-13-2007

Registered User

Ideas Please (File Sequencing)

Hello All

Hope someone can help me with an idea or two on how to approach the following situation;

I currently have a process that generates sequenced files. The sequencing is very important and skipping sequences are not allowed. The applicaton has a single thread that consume data produced buy other threads in the application and this thread is dedicated to file generation and sequecing. When the application encounter a problem it does a rollback and exit. when it restarts it picks up where it left off and everything works fine.

We are starting to experience performance problems though, it simply can't keep up. We need to make the application scalable and I would like to do this by running multiple instances of the application.

My problem is sequencing the files. Everything will work fine so long as no exceptions are encountered, the multiple processes will share a memory area where the sequence will be maintained. But what if one process encounter a problem and exists? When it restart the shared sequence would be have been incremented multiple times.

Can someone suggest an elegant method of approaching this problem?

The application is written in C and is currenty running on TRU64 but will be moved to HPUX early next year.

Thank you,

B

bcpkvh

View Public Profile for bcpkvh

Find all posts by bcpkvh

9 More Discussions You Might Find Interesting

1. Programming

Ideas: 'select'ing file descriptors

Hey everyone, I'm writing a threaded database server application and need to communicate the results of several worker threads to a single multiplexed communication output thread. Basically, the communication output thread sits in a select statement waiting for its client sockets to dole out...

2. Cybersecurity

Any Ideas !!!!!!!!!!

Hi, I installed sybase server on a LINUX server. I assigen port 2025 whilst installation for sybase , later i uninstalled sybase and when i try to reinstall sybase and use port 2025 it throw up error saying that it is already in use, use other port number. How can I re-use the same port number...

3. Shell Programming and Scripting

any ideas?

i need to compare to dates/times given in the format MMDDhhmmYY. That is month, day, hour, minute, year. It is a 24 hour clock. I need to compare two dates to check that they are, say, less than 900 seconds apart. I have got to a point where it checks the time, turns the values into seconds and...

4. Shell Programming and Scripting

Problem with Script that writes max lines of a file - Any ideas how to fix?

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

5. Shell Programming and Scripting

Sliding window for sequencing data

Hi! I have some sequencing data that I have aligned using maq software Now, I have data that looks like this each line is a 'tag' chr1 10001 chr1 10002 chr1 10005 chr1 10007 chr1 10008 chr1 10008 chr1 10008 chr1 10019 chr1 10019 chr1 10020 What I really want to find out is how...

6. Shell Programming and Scripting

Help generating a script for next-generation sequencing data

I am not sure if this is entirely possible, but I want to compare data in a particular column in several .txt files and have a new file generated. I am a biologist with limited unix knowledge. There are currently no programs written for this type of analysis. First I would like to define the...

7. IP Networking

TCP Same Ack Sequencing for Two Packets

I was analyzing a TCP snoop. And found following scenario From Server to Client ---> SEQ 2993 ACK 1744 WIN 8192 LEN 13 From Server to Client ---> SEQ 3006 ACK 1744 WIN 8192 LEN 13 From Client to server --> SEQ 1744 ACK 3019 WIN 3304 I just want to know Why Packet 1 and 2...

8. UNIX and Linux Applications

Need ideas for graduation project based on unix or linux Need ideas for graduation project based on

Dear all, i am in last year of electronics department in engineering faculty i need suggestions for a graduation project based on unix or free bsd or linux and electronics "embedded linux " i think about embedded unix for example or device drivers please i need helps

9. Shell Programming and Scripting

Help me get some ideas

Hello, I have been given a scripting project, but have not learned any scripting. I need to get some ideas on how to start. Attached is part of the project: I have no idea how to parse the arguments. What I had in mind was to get the arguments ($1, $2, ... ) and have if statements for different...

LEARN ABOUT OPENDARWIN

rest

rest(3alleg4)							  Allegro manual						     rest(3alleg4)

NAME

       rest - Waits a specified number of milliseconds or yields CPU. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void rest(unsigned int time);

DESCRIPTION

       This function waits for the specified number of milliseconds.

       Passing	0  as  parameter will not wait, but just yield. This can be useful in order to "play nice" with other processes. Other values will
       cause CPU time to be dropped on most platforms. This will look better to users, and also does things like saving battery power  and  making
       fans less noisy.

       Note  that  calling this inside your active game loop is a bad idea, as you never know when the OS will give you the CPU back, so you could
       end up missing the vertical retrace and skipping frames. On the other hand, on multitasking operating systems it is good form  to  give	up
       the CPU for a while if you will not be using it.

SEE ALSO

       install_timer(3alleg4), rest_callback(3alleg4), vsync(3alleg4), d_yield_proc(3alleg4)

Allegro 							   version 4.4.2						     rest(3alleg4)