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  • Linux configurations that would affect Java memory usage?

    - by wmacura
    Hi, Background: I have a set of java background workers I start as part of my webapp. I develop locally on Ubuntu 10.10 and deploy to an Ubuntu 10.04LTS server (a media temple (ve) instance). They're both running the same JVM: Sun JVM 1.6.0_22-b04. As part of the initialization script each worker is started with explicit Xmx, Xms, and XX:MaxPermGen settings. Yet somehow locally all 10 workers use 250MB, while on the server they use more than 2.7GB. I don't know how to begin to track this down. I thought the Ubuntu (and thus, kernel) version might make a difference, but I tried an old 10.04 VM and it behaves as expected. I've noticed that the machine does not seem to ever use memory for buffer or cache (according to htop), which seems a bit strange, but perhaps normal for a server? (edited) Some info: (server) root@devel:/app/axir/target# uname -a Linux devel 2.6.18-028stab069.5 #1 SMP Tue May 18 17:26:16 MSD 2010 x86_64 GNU/Linux (local) wiktor@beastie:~$ uname -a Linux beastie 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux (edited) Comparing PS output: (ps -eo "ppid,pid,cmd,rss,sz,vsz") PPID PID CMD RSS SZ VSZ (local) 1588 1615 java -cp axir-distribution. 25484 234382 937528 1615 1631 java -cp /home/wiktor/Code/ 83472 163059 652236 1615 1657 java -cp /home/wiktor/Code/ 70624 89135 356540 1615 1658 java -cp /home/wiktor/Code/ 37652 77625 310500 1615 1669 java -cp /home/wiktor/Code/ 38096 77733 310932 1615 1675 java -cp /home/wiktor/Code/ 37420 61395 245580 1615 1684 java -cp /home/wiktor/Code/ 38000 77736 310944 1615 1703 java -cp /home/wiktor/Code/ 39180 78060 312240 1615 1712 java -cp /home/wiktor/Code/ 38488 93882 375528 1615 1719 java -cp /home/wiktor/Code/ 38312 77874 311496 1615 1726 java -cp /home/wiktor/Code/ 38656 77958 311832 1615 1727 java -cp /home/wiktor/Code/ 78016 89429 357716 (server) 22522 23560 java -cp axir-distribution. 24860 285196 1140784 23560 23585 java -cp /app/axir/target/a 100764 161629 646516 23560 23667 java -cp /app/axir/target/a 72408 92682 370728 23560 23670 java -cp /app/axir/target/a 39948 97671 390684 23560 23674 java -cp /app/axir/target/a 40140 81586 326344 23560 23739 java -cp /app/axir/target/a 39688 81542 326168 They look very similar. In fact, the question now is why, if I add up the virtual memory usage on the server (3.2GB) does it more closely reflect 2.4GB of memory used (according to free), yet locally the virtual memory used adds up to a much more substantial 4.7GB but only actually uses ~250MB. It seems that perhaps memory isn't being shared as aggressively. (if that's even possible) Thank you for your help, Wiktor

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  • Converting serial port data to TCP/IP in a linux environment

    - by Doug
    Thank you in advance. I need to get data from the serial port of a linux system and convert it to TCP/IP to send to a server. Is this difficult to do? I have some basic programming experience but not much experience with Linux. Are there any open source applications that do this? Again thank you for any help.

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  • read files in linux from .net program?

    - by Rev
    I need to Read files form Linux , copy them into the another computer(Windows operation) and even delete file in Linux. but I want do this with .net program.!!! these file have a specific location. I need code sample or article for doing that.

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  • Eclipse Memory usuage in Windows Vs Linux..

    - by Nareshreddy Kola
    Can someone please give me the details about the Eclipse memory usage in Windows XP and Linux? I heard Eclipse consumes less memory in Linux compared to Windows? Is it true? What ever the OS is, IDE will look for some amount memory so how will it vary with OS? Related Question: Eclipse memory use

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  • Java ME 3.0 SDK on Linux?

    - by Confused
    Is it possible to develop java me applications on linux? It appears that there is no linux version of the sdk. Otherwise what would you suggest as a good language to develop mobile applications?

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  • Is there any small linux distribution which comes with a complete C devleopment environment

    - by hits_lucky
    Hi, I have installed "Damn Small Linux" on my home computer for doing C development in unix. But the distribution doesn't by default come with the C development environment and I am facing some issues when trying to install the gcc. Is there any other small Linux distribution which by default has the required packages for the C development. And also I don't want additional software which takes up lot of space but still would like to have the graphical environment. Thanks

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  • C++ Win/Linux thread syncronization Event

    - by JP
    Hello I have some code that is cross-platform by unsing #ifdef OS, I have a Queue protected by a CriticalSection on Windows, and by a pthread_mutex_t on Linux. I would like to implement a Wait(timeout) call that would block a thread until something has been enqueued. I though about using WaitForSingleObject on windows but it don't seem to support CriticalSection. Which Win32 and which Linux functions should I use to Wait and Signal for a condition to happen. Thank

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  • mysqldump problem with case sensitivity? Win->linux

    - by acidzombie24
    When i dump a table with uppercase letters using mysqldump it comes out as lower case in my dump.sql file. I found a report here in 2006, almost 4 years old http://bugs.mysql.com/bug.php?id=19967 A solution here suggest making linux insensitive. I rather not if possible. Whats the easiest way to copy a win32 db into linux?

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  • C++ Programming in Linux Platform

    - by viswanathan
    I am a software engineer and i work in VC++, C++ in WIndows OS. Are there any major differences when it comes to coding in C++ in Linux environment. Or is it just some adjustments that we have to make when we need to code in C++ in Linux.

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  • Is there any small linux distribution which comes with a complete C development environment

    - by hits_lucky
    Hi, I have installed "Damn Small Linux" on my home computer for doing C development in unix. But the distribution doesn't by default come with the C development environment and I am facing some issues when trying to install the gcc. Is there any other small Linux distribution which by default has the required packages for the C development. And also I don't want additional software which takes up lot of space but still would like to have the graphical environment. Thanks

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  • Java File.isDirectory() returns False for a Directory in Linux

    - by shelt536
    Please see code snippet: File[] additionalFiles = new File(FILE_PATH).listFiles(); boolean isDirectory = file.isDirectory(); I have verified that the directory path is correct, and when I run the code on Windows, the value of isDirectory is true (as it should be). Any suggestions as to why this occurs on Linux (RedHat Enterprise Linux)?

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  • Learning C++ on Linux or Windows?

    - by ReDAeR
    Hi, Since you 'should' learn C/C++ and as part of 'learn as much languages as possible', i decided to learn C++ in depth. My OS is Windows and my question is should i re-install Linux as a dual boot to learn C++ on Linux? Do i miss something if I develop in C++ only on the Windows platform? (possible duplicate: http://stackoverflow.com/questions/1128050/best-operating-system-for-c-development-and-learning)

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  • How to Customize the Ubuntu Bootloader Screen

    - by Omar Hafiz
    We all know Grub2 is the default bootloader for Ubuntu, but it isn’t the prettiest bootloader ever. Since we also know that Ubuntu is highly customizable, this week we’re going to show you how to beautify your bootloader. To accomplish this, we’re going to utilize an add-on called BURG, which is a Brand-new Universal loadeR based on Grub and is created by Bean. It has much prettier GUI and it supports themes and customizations. Latest Features How-To Geek ETC Macs Don’t Make You Creative! So Why Do Artists Really Love Apple? MacX DVD Ripper Pro is Free for How-To Geek Readers (Time Limited!) HTG Explains: What’s a Solid State Drive and What Do I Need to Know? How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Lakeside Sunset in the Mountains [Wallpaper] Taskbar Meters Turn Your Taskbar into a System Resource Monitor Create Shortcuts for Your Favorite or Most Used Folders in Ubuntu Create Custom Sized Thumbnail Images with Simple Image Resizer [Cross-Platform] Etch a Circuit Board using a Simple Homemade Mixture Sync Blocker Stops iTunes from Automatically Syncing

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  • How to achieve 'Activities' in Unity?

    - by Ralf Hersel
    I like the concept of an activities centric desktop and I wonder if this can be achieved in Unity. For me, an activity is a couple of applications that belong to the same subject, like 'photo manipulation', 'software development', 'office work', 'social activities', 'music and video'. I would like to utilize the virtual desktops to arrange applications that belong to the same activity group. Example: Desktop 1 contains all applications that belong to 'office work' Desktop 2 contains all applications that I need for 'software development' Desktop 3 contains all applications that I usually need for 'photo works' Therefore I would like to give names to the virtual desktops that reflect their purpose. And I would like Unity to auto-start the required applications when I start my computer or when I switch to one of the virtual desktops. Is this possible with Unity (or any other desktop)?

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  • how could installations/configurations be easier in linux?

    - by ajsie
    although you can do anything in linux it tends to require a lot of tweaking in config files and reading a lot of manuals/tutorials before you can have it running in your way. i know that it gets a lot easier by time, and the apt-get installations with ubuntu/debian is heading the right way. but how can linux be more userfriendly for us in the future? i thought that if more is automated like an IDE environment, eg. typing svn will give us all the commands and description about each command when you move between commands with your keyboard. that would be great. but that's just one example. another is the navigation in the terminal between folders. now you have to type a lot just to jump from/to different folders. would be great with some more automatization here too. i know that these extra features will slow down the server, but its 2010 now, and these features are not that heavy for the cpu, but makes it more userfriendly and encourage maintainance of a server, not frighten u off. what do you think about this? should/could we have more user friendly linux environment in servers, something that has annoyed you a lot? a lot of things are done in the unix way, but maybe we should reinvent the wheel in some areas, cause apparently, its so...repeatingly today and difficult to do easy tasks. it should be easier i think..

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  • Virtual Windows desktop

    - by Zack
    Is there any virtual desktop software that can virtualize desktop just like a virtual desktop to sandbox (sort of like virtualization and sandbox combined). I want to create many desktop and each of them must be sandbox. For example if I have virus infected in one of the desktop, I just have to clear or close the desktop and everything is fine. Is there any software that can do that kind of jobs that I have mentioned? Remember I am not asking recommendation of software, but the software that can do the job. UPDATE: I mean that every virtual desktop is working as a virtual box or sandbox. Clearing or closing the desktop will work as shutting down that virtual box.

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  • How to set up DHCP-configured access through a Linux box?

    - by marcusw
    I would like an old desktop box to use my laptop as a router to access the internet. Here is my setup: I have one ethernet port in the side of my laptop which I want to use to get internet access to my desktop computer. The laptop is connected to the LAN via a wireless link. Both systems run Linux. The desktop autoconfigures itself using DHCP. The laptop is a Kubuntu system. I do not have any crossover cables, though wireshark on the laptop sees the DHCP requests from the desktop just fine, so I doubt that I need one. What do I have to do to make this work?

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  • Server extremely lags and logs bunch of 'internal dummy connection'

    - by Dmitry
    Having a web-server (don't know actually whoset it up, it's my heritage). Few hours ago it started working very (extremely!) slow, mysqld oftenly fails requests. /var/log/mysqld.log is empty (well, it says, mysqld started, and so on, but nothing regarding today) /var/log/apache2/access_log is full of such lines: ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" Guys, what's that? How to heal this? I read internal dummy connections happen sometimes, but sending internal requests at 1000/sec frequency isn't freaking normal!How to find out the reason of this?

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  • sem_open() error: "undefined reference to sem_open()" on linux (Ubuntu 10.10)

    - by Robin
    So I am getting the error: "undefined reference to sem_open()" even though I have include the semaphore.h header. The same thing is happening for all my pthread function calls (mutex, pthread_create, etc). Any thoughts? I am using the following command to compile: g++ '/home/robin/Desktop/main.cpp' -o '/home/robin/Desktop/main.out' #include <iostream> using namespace std; #include <pthread.h> #include <semaphore.h> #include <fcntl.h> const char *serverControl = "/serverControl"; sem_t* semID; int main ( int argc, char *argv[] ) { //create semaphore used to control servers semID = sem_open(serverControl,O_CREAT,O_RDWR,0); return 0; }

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  • How does Linux determine the SCSI address of a disk?

    - by Chris Sears
    Greetings, I'm working with RHEL 5.5 guest VMs under VMware ESX 4. When I configure the virtual disks in the VM hardware settings, each disk has a SCSI address in the format "N:M". For example, "1:3" would mean SCSI host number 1 and SCSI target ID 3. When I look at the disk info from the VM's BIOS or a Windows OS, the detected SCSI address info matches up with the virtual hardware settings. But under Linux, the SCSI address components don't match up, at least not completely or consistently. I've tried the three supported virtual SCSI and SAS drivers and they all seem to be "broken", but in different ways. Here's a list of the virtual hardware addresses vs what was detected under Linux with each of the drivers: Driver vHW Addr Linux Addr -------- -------- ---------- LSI SAS 0:0 0:0 LSI SAS 0:3 0:1 LSI SAS 0:6 0:2 LSI SCSI 1:1 2:1 LSI SCSI 1:4 2:4 LSI SCSI 1:7 2:7 pvSCSI 2:2 1:2 pvSCSI 2:5 1:5 pvSCSI 2:8 1:8 My main question is why does this happen under Linux? The next question is: how do I get it fixed or fix it myself? If I was going to guess, I'd say it's an issue with how the kernel is handing out the SCSI host number and how the Linux SCSI driver (included with VMware tools) is detecting the SCSI target number. Perhaps the order the drivers are loaded also has something to do with the issue. I'm guessing this would not involve udev, but I could be wrong. Any thoughts would be appreciated. Thanks! PS. My environment is VMware, but I don't need an answer for these drivers specifically. I imagine this might be a problem with any SCSI driver under Linux.

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  • How to connect a USB GDI printer to Linux over a D-Link print server?

    - by jpe
    The setup is the following: +------------+ +-----------------+ +---------+ | HP LJ P1005|--USB--| D-Link DPR-1020 |---LAN---| PC Linux| +------------+ +-----------------+ + +---------+ | +------------+ +--| PC Windows | +------------+ HP LJ P1005 is one of those GDI printers that requires the printer driver to do most of the work for it and therefore is a bit "special". D-Link DPR-1020 is a print server with an Ethernet and an USB port that actually supports printing to challenged (read GDI) printers using a utility called PS-Link. What the utility does is basically mirror a USB port over the network to the print server so that the printer driver and the printer both are happy to talk to each other. The PC-s are notebooks that come and go, i.e. are not there all the time. Is there an equivalent of the D-Link PS-Link utility for Linux that could mirror a USB port over the network for a Linux host? And can the solution be used with D-Link DPR-1020? If not then I basically wasted the money buying the print server because the goal was to share a small printer among a couple of users with diverse operating systems in an office. The print server specs say that it supports Linux and LJ P1005, but the Catch 22 appears to be the solution used for GDI printers... It should be noted that it is possible to print from Linux to LJ P1005 directly over USB. This far sharing involved reconnecting the USB cable to appropriate computer to print. Now one of the desks is separated, so the cable does not work. Searching the net did not yield anything useful. Please do not suggest solutions involving a Windows machine (either virtual or not), my question is whether a solution only involving a Linux machine exists.

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  • What's the environment variable for the path to the desktop?

    - by Scott Langham
    I'm writing a Windows batch file and want to copy something to the desktop. I think I can use this: %UserProfile%\Desktop\ However, I'm thinking, that's probably only going to work on an English OS. Is there a way I can do this in a batch file that will work on any internationalized version? UPDATE I tried the following batch file: REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop FOR /F "usebackq tokens=3 skip=4" %%i in (`REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop`) DO SET DESKTOPDIR=%%i FOR /F "usebackq delims=" %%i in (`ECHO %DESKTOPDIR%`) DO SET DESKTOPDIR=%%i ECHO %DESKTOPDIR% And got this output: S:\REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders" /v Desktop HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders Desktop REG_EXPAND_SZ %USERPROFILE%\Desktop S:\FOR /F "usebackq tokens=3 skip=4" %i in (`REG QUERY "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folder s" /v Desktop`) DO SET DESKTOPDIR=%i S:\FOR /F "usebackq delims=" %i in (`ECHO ECHO is on.`) DO SET DESKTOPDIR=%i S:\SET DESKTOPDIR=ECHO is on. S:\ECHO ECHO is on. ECHO is on.

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