Programming :: Limit Number Of Concurrent Jobs By Process Name?

Apr 7, 2011

I am trying run audio conversion on my server that I want limited to a certain number of processes based on process name. I am using the following script but it isnt limiting the number of job like I want it to.

$num_jobs = 13
while [ $(ps -A | grep -v grep | grep -c pacpl) -ge $num_jobs ]
sleep 1


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Ubuntu Servers :: Limit The Number Of Concurrent Clients In Ssh Server?

Feb 1, 2011

I am using ssh server to connect to my Ubuntu desktop. I opened the file sshd_config and change my port number of the server.I want to put a limit on the number of clients in the ssh server.

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Server :: Concurrent File Read Limit

Jul 12, 2011

More of a "Knowledge" question... Is their a limit to the number of reads a single file can take? Say for example I have a file named config.xml in an htdocs directory and a XMLReader function from PHP reads some value(s) out of this file for every connection of Apache or NGinx. Now suppose my site receives a gigantic spike in traffic (but Apache stays opertational through it all)... Is their a point at which the underlying system would simply not be able to open+read config.xml anymore??

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Programming :: Limit In Number Of Fields That Awk Can Handle

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 :


awk -F, 'END { for (k in _) print _[k] } { _[$1] = $1 in _ ? _[$1] FS $4 : $1","$4 } ' file > out

Also, this command writes ^M (windows line break) after each columns. Removing them is easy but where do they come from ? Working on Ubuntu 10.10

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Networking :: Max Number Of Concurrent TCP Connections

Feb 3, 2011

How do I find the maximum number of concurrent connections (in any state)? I'm running RHEL5 2.6.18-194.26.1.el5. Also, does tcp auto tune affect the number of concurrent connections or is it mostly used for dynamic buffer size allocation?

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Programming :: Find Number Of Threads In The Process In C Language?

Dec 23, 2009

I need to find how many threads are alive with respect to the current process for my further processing. Is there any means to trace this number ?[URL]I referred the above link. But sys/pstat.h is not in my system. Don't know which library gives this header.

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Server :: Apache Virtual Host To Limit The Concurrent Connections Of Virtual Hosts?

Jul 3, 2009

apache virtual host to limit the concurrent connections of virtual hosts? Taking into account the host of each virtual user's home directory can also have more than one subdirectory, which should be restricted to a subdirectory. Is beyond the control of the operation of these sites in a subdirectory. Best local restrictions or limitations to the overall situation.

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Ubuntu :: Kill A Process - Jobs - Pd

Mar 28, 2011

I am learning terminal and i want to kill a process. There are 2 ways to do it i ve heard. 1st way is to type following in terminal:


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Programming :: EPOLL Echo Server Not Concurrent?

Feb 16, 2011

I am working on an epoll version of an echoserver that I am porting from a multithreaded version I wrote.What it should do: The server should get a connection from a client > say x client connected > print x message from said client. What it is doing: The server looks like it is only accepting one connection at a time, and any other clients are queued. When the queue is empty it looks like the program is aborting with a SIGABRT. EDIT:// fixed the program exiting in the close function. Still one client at a time

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>


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Security :: Limit The Number Of Ssh Connections?

Dec 13, 2010

Dist: Fedora 14
SSHD: OpenSSH 5.5p1

I need to limit the number of ssh connections a user has. All the users are using tunnel only so their shell is set to /sbin/nologin The logins do not open a shell they just create the tunnel so /etc/security/limits.conf has no effect on them at all.

I tried setting 'MaxSessions 1' in sshd_config but either that doesn't not do what I expect it to or it plain does not work as even with a normal user I was able to open an unlimited number of sessions. I need a good secure way to limit each user to 1 ssh session without them having a shell but Im unable to find a solution.

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Fedora :: How To Limit The Number Of Files In A Particular Directory

Aug 31, 2011

I was nosing around in my /home folder and I noticed that the /.thumbnails directory had 38,000+ files in it. That number seem a bit excessive to me. Is there a way to limit the number of files that are allowed to be in that directory, and maybe delete the oldest files automatically when the directory reaches it's limit in order to make room for the new incoming files, so there are no "directory full" type of errors?

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Ubuntu Servers :: Limit On The Number Of Processors?

May 6, 2010

I have a server with 48 cores, 8 6-way Opteron CPU's. Ubuntu Server 9.04 only sees 32 processors. Is there a limit on the number of cores/processors that the server will use? Windows 2008 on the same server sees all 48 cores and the so does the BIOS, so this is unique to Ubuntu right now.

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Security :: Limit Number Of Emails Send From One IP?

May 19, 2009

I'm looking for a solution for sendmail to limit the number of emails send per miniute per IP. For example all my local computer user with ip 192.x.x.x need to able to send 10 emails/minite (emails, not connections!. The rest of the world can send for example 200 emails/minute to the mailserver. If the amount of emails per minute is exceeded, sendmail needs to block receiving emails from the spesific IP. I want to do this to stop spaming from my local network. Is it possible?

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Server :: Limit The Number Of Logins For A User To Only One?

May 3, 2011

I ran into a user today that indicated that their company only allows them to log in through a terminal session once (no multiple logins). On second try their login window terminates. They are using putty.Is this being accomplished through PAM or sshd ( or some other method)?

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CentOS 5 :: Limit To The Number Of Virtual Guests?

Jun 22, 2010

Does anyone know if there is a limit to the number of virtual guests you can have in kvm. RHEL has a limit of 4. RHEL AS is unlimited. What is CentOS?

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Ubuntu Security :: Possible To Limit Number Of Prompts For Keyring Password?

Jan 18, 2010

I have a standard home set-up for my Ubuntu OS, and I would like to know whether its possible to cut out the repetitive prompts to enter the password, as when you connect to the internet or access files on a partition that's not home, or install new software.

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Security :: Limit Number Of Connections For Single Ip On Port 80 To CentOS 5.5

Sep 5, 2010

How to number of connections for a single ip on port 80 to CentOS 5.5 with iptables? connlimit did not work on CentOS and nginx does not provide a module for that

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Server :: Limit Number Of Simultaneous Connections From Any Given IP Addrss Every 5mins Say

Jul 28, 2010

except is there is a way to enhance mod_limitipconn.c to ensure that apart from restricting one connection allowed from a given IP, also set so that an IP can only connect on every set interval ?e.g.restrict the number of connections from a given source IP to say once every 5 minutes or so?if not mod_limitipconn.c, any other mechanism to do the expected result?

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Ubuntu Security :: One Limit The Number Of Open Sockets To Prevent Exploiting?

Dec 6, 2010

I was searching around and I stumbled upon a Linux Kernelix Sockets Local Denial of Service exploit.I downloaded the exploit, compiled it ran it to check if I am vulnerable.As I was expecting, the exploit instantly "killed" my Maverick system and I had to use the power button to reset my computer...Is there any way to limit the numberof allowed open sockets?I don't think that this can be done using /etc/security/limits.conf in a similar way of preventing the fork bombs

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Server :: Limit On The Number Of Virtual Machines Running On RHES / CentOS XEN?

May 2, 2009

We've been experiencing sudden host server crashes minutes after starting a fourth virtual machine. Our setup looks like:

Dell Poweredge T300
1 x Intel Xeon X3323 Quad Core 2.5 ghz
16 GB Ram
CentOS 5.3 (64 bit)

Server is running a stripped down version of CentOS 5.3 (64-bit), running only the built-in Xen Virtualization Environment. There is no other services running on the server (not samba, httpd, sendmail, cups... nothing except Xen) We've created several virtual machines, and as long as we don't start a fourth virtual machine everything runs smoothly (impresive hardware).

Each virtual server is configured as:

1 Virtual CPU

However, 5 minutes or so after starting a fourth virtual machine, the entire host server crashes and restarts itself. Are we limited by the number of cores on the host machine CPU (4 cores)? 1 for the host and 3 for virtual machines? We've read in forums about other Xen setups running up to 11 virtual machines on less powerful hardware? (a dual core server). Should we be using FULLY VIRTUALIZED virtual machines instead? Is the number of XEN virtual machines in fact limited by the number of cores? If so, how can someone run several virtual machines on a single core host?

By the way, we were replacing a previous Dell Server (Poweredge 2600 with 512 MB Ram and a single Xeon single core processor running Open Virtuozzo). We were able to run up to 16 virtual machines at the same time. Of course none of the machines endured hard work (testing environments, etc). But hey, my point is that we expected to get a much higher number of virtual machines on this new hardware.

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General :: Limit Any Process From Using More Than 500 MB Of RAM?

Jan 30, 2011

I would like to limit any process from using more than 500 MB of RAM. AFAIK this is done using RSS in /etc/security/limits.conf but the process called gnome-panel apparently is using 618436 kB of VmRSS. How can this be ?


* hard rss 512000


username@debian:~$ cat /proc/3002/status
State:S (sleeping)


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General :: Way To Limit CPU Usage For Some Process?

Sep 21, 2009

I'm writing a shell script which aims to create a safe gtared (xxx.sql.gz) copy of MySQL databases.This script is planned to be Cron-Jobed.

Well, what I need to add to this shell, is something that limit CPU usage for the whole process (just in case if the database being generating is a huge one.)So, after few time of googling I found couple of solutions:

- Using cpulimit.
I tried to place the code in Position(1) and Position(2) but it didn't seem to be working fine.. Any idea about the right use?

And the other Solution is:- Using nice.

Well, assuming I named my shell script (sqlbacker)..

Finally, this is my first time I ever write a shell, so correct me if somewhere I made a mistake :-)
(The script itself works perfectly)

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General :: Need To Limit CPU Usage Of Process

Jan 26, 2010

There's a disfunctional process eating copious cpu time.Is there a way to effectively assign it a high nice value? I need to do this whenever it runs, for whatever reason, and I can't be bothered to track down all the scripts and scenarios that cause it to run and change the script to use nice. And I can't be bothered to manually run renice whenever I notice that it's running.

I want the OS to automatically assign a high nice value to this process, perhaps based on the processes name. Is this possible?Presumably, a cron job could run every 5 minutes and run "renice" on every process matching a given name, but I'm hoping for a solution with more finess.

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General :: Limit The Memory Usage Of A Specific Process?

Apr 24, 2010

I've written a program for a class that my professor will be testing in various low memory environments to see how it behaves when the program runs out of memory. Is there a way I can simulate the execution in a low memory environment without creating a virtual machine?

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General :: Limit The Upload / Download Of A Program Already Running (A Process)?

Jun 2, 2011

I have already tried trickle and wondershaper. I need a program that can limit the speed of download/upload of an already running program. Similar to the how NetLimiter in Windows limits already running processes. Using Linux.

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Programming :: Run Parallel Jobs With Make -j4?

Nov 27, 2010

I use an application called redbutton-browser to access some of the things available on the redbutton digital tv channels. It compiles fine if I use a simple make but fails if I try to run parallel jobs with make -j4. I'd like some help altering the Makefile so that it does a few commands sequentially before it does the rest of the Makefile in parallel.

The relevant bit of the Makefile looks like this:

ISO13522-MHEG-5.c:xsd2c.c ISO13522-MHEG-5.xsd add_instance_vars.conf add_rtti.conf
make xsd2c
./xsd2c ISO13522-MHEG-5.xsd
./add_instance_vars ISO13522-MHEG-5.c ISO13522-MHEG-5.h
./add_rtti ISO13522-MHEG-5.c > rtti.h


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Programming :: Using `jobs` In A Script Not Working

Aug 30, 2010

why when I use "jobs -l >> tmp" in a script file it does nothing, and when typing it at the prompt it creates the tmp file I expect it to...?

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General :: Optimum Number Of Processes For Process?

Oct 24, 2009

Optimum number of processes for procesor In Linux based os are there a optimum number of process for a processor that gives 'maximum performance' for system(or process range depend on cpu speed,cache etc...)? By 'maximum performance' I mean better performance?

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Programming :: Correct Way Of Spawning Parallel Jobs?

Mar 18, 2010

I need to spawn 2 processes in parallel and each takes an hour or so to finish. Is the following one of the correct ways of using `at` in a script run by crontab?

# define the env var, cd, etc... assume everything ok up to this point
date +"The start time is %H:%M:%S"
rm -f a.fin
at now <<END_OF_AT
do_a &> a.log


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Programming :: Get Background Jobs To Execute Sequentially?

May 4, 2009

I'm looking for a general pointer, or label for what I am trying to do. Not a specific line of code. I've written a couple of small sh script that gets some user input, then calls several programs to run in the background with the &. My problem is, they all run at the same time. Is there some way to get these jobs to run sequentially rather than consecutively? If yes, what is this process called? I'm thinking there should be a way to line up background jobs in a job queue, similar to how a print queue works, one job at a time. After searching for a couple of hours, I'm thinking there must be a name for this, but I don't know what it is.

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