Ubuntu Servers :: Force Java Program To Use More CPU
Mar 23, 2011
I have ubunto 10_4 X86-64 (I use putty to connect)
installed apps
screen
mysql server-client
my java program
open jdk* 64bit
apanche2 (the web server stuff)
and its aVPS machine
Xeon 2.0 64bit 4 GB ram
How can I make (or force) my java program to use more then 1 core? I would like it to be using just 5 of the 6 that I have. I use a .sh to run it this is the code for it.
Code:
#!/bin/bash
cd "${0%/*}"; java -Xshare:auto -Xmx2662M -jar craft.jar
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Nov 8, 2010
im looking for a good brute force program that has i gui. i used to use brutus on windows but now im only running ubuntu so i need to find one.
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Apr 30, 2010
I have a jsp code. After executing that code, a Java program should be executed without refreshing the page. that is, my first page is a login page which is in jsp. After logging in the next page must be displayed which is a Java code. is that possible? Can we use applet for that?
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May 15, 2010
what the shortcut keys are to force quit a program that has frozen up in Ubuntu 10.04? I use to know it, but can't remember
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Jul 7, 2011
running Linux release 2.4.19-uc0, build #511 embedded on a device. It is stripped down to a very minimal configuration and so many of the normal commands are not present.I'm trying to force a reboot from an application I've got running. I've tried the following:
system("shutdown -r");
or
sync();
[code]....
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Mar 9, 2010
Code:
johnh@tux:~$ sudo -i
root@tux:~# apt-get purge webmin-bind
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
linux-headers-2.6.31-14 linux-headers-2.6.31-14-generic
Use 'apt-get autoremove' to remove them.
The following packages will be removed:
webmin-bind*
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
3 not fully installed or removed.
After this operation, 1,339kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 180904 files and directories currently installed.)
Removing webmin-bind ...
/var/lib/dpkg/info/webmin-bind.prerm: 6: /usr/sbin/update-webmin: not found
dpkg: error processing webmin-bind (--purge):
subprocess installed pre-removal script returned error exit status 127
Errors were encountered while processing:
webmin-bind
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@tux:~#
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Feb 4, 2011
At the moment im using a live linux distribution and running a program to test the security of my website. Unfortunatly this program is running from, and seems to fill up rootfs, at which point the program crashes and dissapears.
Is there any way to force a program to run totally from RAM, which i would presume would automatically use a swap file because of the in built memory management in linux, of which is a 30GB partiton.
I know i could just install the distribution to the partition instead, however it has peaqued my interest in just how much control linux has over the programs running on it.
So the question is - Is it possible to run a program totally from RAM, forcing all inputs/outputs to be re-directed to/from RAM to keep the rootfs clear whilst the application does what it needs to?
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Jul 15, 2010
I decided I was going to compile XChat from source today for "fun." What I ended up doing was spending a few hours getting it to compile, then find out everything didn't work the way I thought it did. I was under the impression that after I ran "sudo make install" I was "upgrading", when in reality I'm just installing a seperate version alongside the old one. Apparently I have to keep the old version so every program that was compiled with it will continue to work, so how do I:
1) Force a program to use a specific version of GTK when compiling.
2) Find where my version of GTK installed to.
I've asked some people and I've just been told to "learn LD_PRELOAD". I've googled and can't figure how I could even apply that to my current problem
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Jan 11, 2011
I have a PCI compliance notice sitting here telling me to upgrade to Apache 2.2.17. Thing is, Ubuntu is quite happy sitting on 2.2.16 (Ubuntu).
I understand that the Ubuntu folks' reasoning in rolling security updates back to 2.2.16, but I need to get an automated scan to shut up.
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Aug 7, 2011
I have set the kernel selection time out to 3 seconds. However, sometimes it just hangs indefinitely on the kernel selection screen until I manually select the kernel. This is bad news since it is a VM started up from a script and _has_ to start automatically. The VM is a re-constructed cloud backup made by rsync and re-running grub.
Is there any way to force Ubuntu to NEVER, under any circumstances, not time out on kernel selection.
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May 9, 2010
How can i do Java programming on ubuntu.
i mean how to install java on ubuntu.
i tried but fail to install jdk.
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Sep 15, 2010
How to make a shortcut to a program?
It's a Java program started by a shell script
#!bin/sh
java -jar LinShredder.jar
It starts okay in its original folder, but when I link to it from e.g. the desktop it doesn't work.
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May 9, 2011
I would like that my java program continues executing when I close the ssh connection, how can I do that? I suppose I have to create a service, but I have no idea how to do it!
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Mar 25, 2011
I have a problem starting a java program.
I installed and am trying to run Antelope an ant file editor. When I try to start antelope I get the trace-back listed below.
When I first tried to start Antelope it asked me where ant/lib was located. I pointed it to /usr/share/ant/lib which has 3 jar files named ant.jar ant-bootstrap.jar and ant-launcher.jar.
I am running in Fedora14. With java version "1.6.0_20"
OpenJDK Runtime Environment (IcedTea6 1.9.7) (fedora-52.1.9.7.fc14-i386)
OpenJDK Client VM (build 19.0-b09, mixed mode) and javac 1.6.0_20
When I try to start it I get
Code:
I have tried it 2 ways, one with the environment variable ANT_HOME set to /use/share/ant/lib - which has some 3 jar files - and also to /home/knox/apache-ant-1.8.2/lib which has about 25 jar files. Same error message both ways.
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May 30, 2010
I have a 8.04 LTS server that i have installed a new 1TB drive. The server is running great but I am bit confused regarding the ln -s command and drive mounting. I have backuppc installed on the server and I am running out of storage space. To reolve this I moved the cpool and pool directories to the 1 TB drive and type from within the /var/lib/backuppc directory ln -s cpool /store/1TB/cpool this created the symbolic link to the new drive and everything works fine. I then rebooted the server and everything is runing fine but the drive does not show up in the df -h command, however the directories appear to be mounted fine.
I thought the drive would not be mounted automatically until it was defined in the fstab. Does the ln -s command force the system to automatically mount the directories but not the volume? This behaviour has caused me to delete my backup data becuase I was sure the disk was not mounted but is was!
[Code]....
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Jun 22, 2010
I've got a database and I've got a Java program that I'm programming in Netbeans that is suppose to run queries to the database. how I will set about to connect the database with the Java program so that I can run the queries?
It is very important that I learn how to do this, else I am forced to go back to XP in order to finish this project on time.
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Apr 28, 2010
Trying to use the html editor 'Arachnophilia'... here are the instructions on their website. ".Open a command console (Linux: shell console), move to the Arachnophilia program directory, type "java -jar Arachnophilia.jar" For convenience, this command can be made part of a shell script, and those using X windows can easily make a desktop icon." hoping someone can explain how to run this program.. using a new install of fedora 12 (which has java)...i'm a newbie, trying to go open source on a low end laptop - LOVE Fedora .[URL]..
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Apr 27, 2010
I just got linux yesterday, ubuntu 9.1, with the wubi installer. I have no previous knowledge of linux and I am having a very hard time working out how to install or run any programs, at the moment I'm trying to get java to work.
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Apr 9, 2010
I want to execute Linux commands using a Java program. I came to know that we can use Runtime.getRuntime().exec("commands") to execute the commands through the program. I'm new to both Linux and Java.
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Mar 11, 2011
I have added to my Panel the "Force Quit" program to click and use so I don't have to type it in on the rare occasions that I need it. I accidentally clicked it today not needing it. Not knowing this would be an issue, I clicked on it thinking it would force itself to quit and just close itself. I know I should have just hit esc to close it.
The problem I have now is that it is now frozen on my screen and for the life of me I cant figure out how to get rid of it. Yes I tried esc. I tried opening System Monitor and looking for it to end the prog and couldn't find it. I know I could fix this by just restarting the x server, but at the moment I happen to have several things open that I either cannot save right now or are actively running.
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May 12, 2011
I'm trying to dump a mysql database on a small web server without killing performance. I tried using the nice command to give the mysqldump and gzip a low priority, but gzip is still taking up 100% CPU. Pages on the web server are loading incredibly slow. Here's my command:
Code:
nice -n 19 mysqldump -u USER -pPASSWORD DATABASE | nice -n 19 gzip -9 > OUTFILE.sql.gz How do I get gzip to run without taking up 100% CPU? I've attached a screenshot of top about 8 seconds into the dump.
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Jan 17, 2010
I run a program by executing this command in a terminal screen.Code:coco@coco-desktop:~/Escritorio/MO_1.10/MagnumOpus$ java -jar MagnumOpus.jarSince it is a bit tedious, I tried to create a launcher. I copied the above code into the Command box. The launcher is created, but fails to run the program. Instead I get an error message.
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Mar 8, 2011
I'm a bit lost with the PHP/Sendmail configuration, maybe somebody could help me getting back on the right track. Following situation:
Postfix:
* accepts smtp on port 25 but from his own domains. Some policy and spamchecks through amavisd are made.
* accepts submission on port 587 and 465 from authenticated users only. Quota and spamchecks prevent outgoing spam.
So I'm enforcing a very strong outgoing spam-policy but the users are still able to use the php mail() function to send spam through the /usr/sbin/sendmail command.
My users have access to their own php.ini so my idea was to somehow enforce the delivery through the local postfix on port 587 or 465 and just let them enter their user/pass in their php.ini. (I suppose, their might be a cleaner-solution ).
Unfortunately, my configurations like smtp_host, port, user etc. are getting ignored if the sendmail_path line is active. But if I comment this line out, php just uses the default, which is the same as configured in the sendmail_path line - so it's active whether i use the line or not (setting it to an invalid command breaks the mail() function completely).
how can I enforce my anti-spam policy on the php mail() command?For my ssh users I just blocked the outgoing connection to localhost on port 25 which seems to work so far, but somehow the postfix-sendmail-wrapper just ignores this.
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May 25, 2010
I have a java program with gui. I want to start this program in the start of system (rc3.d) and when I connect to the machine bring to front without open another time the program. I want to connect to opened program in the start of system.
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Jul 24, 2011
So this picture will explain [URL].. So after i typejj java -jar RSBot-257.jar it should have to come ijj up.It doesent show any errors but doesent start.What to do?
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Jul 7, 2010
I am facing problems to restart PADS(Passive asset detection system) from java program.I used the root as a user. So from the command prompt I can start PADS with out sudo ,but when I try to start PADS from the my java program i.e.
Process proc=Runtime.getRuntime().exec("pads restart");
It throws the error in log that FATAL error ! you not root and permission denied.
Then I tried the same with sudo
Process proc=Runtime.getRuntime().exec("sudo pads restart";
Here it create another two process extra
1 for stop the pads
2) for start the pads
It does not kill the previous process of PADS .and both the process get hung.
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Jun 4, 2011
Is it possible to debug remotely a java program with ddd (data display debugger)?
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Aug 12, 2010
I am trying to write a java program and eventually a web app to do the following.1. get the server name, username, password from the user and ssh to the linux box.2. goto a folder, open a script file (the file has different function calls, I need to comment all other function calls and just un-comment the one I want to use)
#call_1
call_2
#call_3
[code]....
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Feb 25, 2011
I Want to Develop Network Scanner Software. For that i need "Java Program to Display All IP Addresses in LAN".
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May 3, 2011
In gui validation if user enters string in integer requiring field, a dialog box pops out. So on clicking the button i want to stop the program execution and return to the previous jframe(either the same one or newly created object of it).
How can i handle this in java.
I tried calling main(); but it doesn't work.
Also System.exit(0); doensn't work.
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