Programming :: Theoretical Limit On Message Queue Sizes ?
Jun 4, 2010
Following function obtains the system-maintained structure for a message queue:
Code:
And following function simply resizes a message queue to a user-defined value, namely, "size":
Code:
My question is if there is a theoretical limit on user-defined message queue sizes.
To put in other words, is it possible to increase the default message queue size to any user-defined value as long as that certain value does not exceed the size of system's physical memory ?
I use 64-bit Ubuntu 9.04.
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Dec 3, 2010
I'm facing a scenario in which i need to block messages from being passed onto a message queue when my code is running. how to proceed.
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Jun 7, 2011
How to communicate between two threads using message queue?
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Jun 14, 2011
In a single main() function,so need signal handling. Use Posix Message Queue IPC mechanism , can ignore the priority and other linked list message,to implement the scenario:
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Jun 23, 2010
An arbitrary matrix can be solved using Gauss-Jordan elimination with O(n^3) complexity. A tridiagonal matrix (i.e. a special type of matrix) can be solved using Gauss-Jordan with O(n) complexity. That is, a for an arbitrary matrix, Gauss-Jordan is a cumbersome algorithm, but for a tridiagonal matrix, the algorithm can be expressed as a loop and a simple formula. If I were writing, for example, a compiler or some optimization program, is there a way to test the problem to see if it has become less complex, so I can express the algorithm more simply?
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Mar 15, 2010
I just recently reinstalled (clean) Ubuntu 9.10 Karmic Koala last week. In that time, over 40GB of log files were created until the FileSystem was full. I then received a low disk space message and ran disk usage analyzer to find out that almost all of the 44GB I had free were taken up by the /var/log directory. I then preceded to delete the 5 largest files which freed up over 40 GB of space.
Basically I believe that I have two problems:
1.) The log files are logging too much information (40 GB in one week).
2.) I need a way to automatically limit the size of the log files. I have tried searching online for this solution and briefly came across logrotate but I don't believe that this will completely solve my problem as it only compresses and backs up older logs. I need something that will remove old log entries altogether. If logrotate is capable of this can someone please walk me through the process? I do not remember all five log files that were in question but they did include: messages, syslog, and daemon.log. I believe kern.log may have been involved too.
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Apr 27, 2010
I notice that when someone sends a message from my Postfix server & it can't find the destination server or if there is a incorrect domain recipient entered by mistake, it sits in my Postfix queue for days. I think perhaps 4-5 days for some reason. I was wondering if I could shorten the time so the sender gets a delivery failure message kicked back to them in 24 hours rather than waiting 4 or so days.
Code:
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Nov 3, 2010
is it possible to get the length or even the items of both queues, the run queue and the swap queue? I've googled a lot but had no luck. Maybe I havn't used the correct search words...
Is there any header and/or code example to use structures or any API to get these information from the kernel or the scheduler?
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Sep 1, 2010
I have been trying to increase the message_size_limit on my Debian 2.4.26 box with postfix 2.3.8. For example, I set message_size_limit and mailbox_size_limit to 104857600 (100m) and restart postfix. Running postconf -n confirms that it has changed. However when I send a test message it kicks it back saying the message size limit is 16777216 (16m, which is, incidentally, the default value of the berkeley_db_create_buffer_size parameter)
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Jul 22, 2010
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May 15, 2011
Is there a more convenient way or function call to submit a job to a queue than the following in Linux?
Code:
#include <stdlib.h>
...
system( "at -f /var/myproj/task_starter.sh now" );
...
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Mar 10, 2010
With three 1.5TB, 7200RPM drives in RAID0, they thrash. And yet the network out, 4 gigabit ports LAG'd together to create a single 4 gigabit connection, can't even push a single gigabit a second.
Here's what I've done so far:
I've enabled jumbo frames on the bond: ifconfig bond0 mtu 9000
Tweaked SAMBA performance:
Tweaked hdparm:
I haven't enabled jumbo frames on the switch but I'm almost sure that won't help me much after trying all this.
I'm running out of ideas here guys. The clients connected are pulling down images in both Ghost and WIM (ImageX) format. Large files too, upwards of 12 gigabytes.
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Jun 21, 2010
I am in deeply need of queue (linear data structure) in shell script. How can I implement this ??
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Sep 6, 2010
We are trying to create a message forwarder program that receive a message on Port A and pass it on t Port B. Also receive a message from Port C and Pass it on to Port D as follows.
[Code]...
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May 1, 2011
Why is it in Linux that there is a stack size set by default? And why is it so small? (My system is set to 8192 kbytes.) And why is there a default limit on the stack size when the max memory and virtual memory size are, by default, unlimited? (Aren't they both fed from the same place ultimately?)
Reason I ask: I want to use recursive functions in my programming a lot more. Problem is, if the language (or implementation) doesn't happen to support tail-call recursion, then I can be pretty well certain that the first huge problem that gets thrown at my function is going to kill my program because the stack size limit is going to be quickly reached. Obviously, I can change the stack size limit for my own computers, but it doesn't feel so great knowing that most of the people who copy and execute my code will have probably have overlooked this. Anyway, does anyone know: is this small default stack size limit just one of those historical artifacts, or is there some technical reason for it?
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Mar 2, 2011
I have a file with 200 000 lines and I want to append the fields of each line based on matching first field. The resulting file should have 70 000 columns but has "only" 18 000. The command I'm using is working perfectly with a smaller file, wich lead to 14 000 columns. Could there be a limit in number of fields that awk can handle ? Here's my awk command :
Code:
awk -F, 'END { for (k in _) print _[k] } { _[$1] = $1 in _ ? _[$1] FS $4 : $1","$4 } ' file > out
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Dec 28, 2010
my secure log is flooding with these messages..
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Mar 2, 2011
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Here is Table 1:
Code:
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code....
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Apr 7, 2011
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Code:
#!/bin/bash
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do
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[Code]...
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Jun 22, 2011
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May 12, 2010
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Quote:
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May 11, 2011
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Code:
/* tcpserver.c */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
[Code]....
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Sep 2, 2010
I'm having a problem with setrlimit() under linux.
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May 13, 2010
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Jan 26, 2011
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May 24, 2010
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Jul 21, 2010
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Feb 15, 2010
My level is starter with Ubuntu. Moderate experience with C.Problem starting with programming in C under Ubuntu.I have installed Anjuta IDE and made this classical program.
#include "stdio.h"
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Sep 6, 2009
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Here the program so far:
<?php
/*
CHFEEDBACK.PHP Feedback Form PHP Script Ver 2.15.0
Generated by thesitewizard.com's Feedback Form Wizard 2.15.0.
[code]....
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Dec 13, 2010
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PHP Code:
<?php
$con = mysql_connection("localhost","root","123");
if(!$con)
{
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PHP Code:
<textarea rows="3" cols="30" name="txtcomment" wrap="physical">Leave a Comment
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