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  • malloc()/free() behavior differs between Debian and Redhat

    - by StasM
    I have a Linux app (written in C) that allocates large amount of memory (~60M) in small chunks through malloc() and then frees it (the app continues to run then). This memory is not returned to the OS but stays allocated to the process. Now, the interesting thing here is that this behavior happens only on RedHat Linux and clones (Fedora, Centos, etc.) while on Debian systems the memory is returned back to the OS after all freeing is done. Any ideas why there could be the difference between the two or which setting may control it, etc.?

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  • Howto change current user password?

    - by TomTom
    ...when logged into a Server via remote Desktop? I see no way to Access Windows security. In "old" 2008 R2 there was a "Windows Security" entry in the start menu when coming via rdp. In the new Metro Start Menu, the username context menu allows me to lock the Computer or log out - but not Change the Password. Yes, I can go through user Management, but this is not something I want People to do ;)

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  • Squid on Linux Windows Pass through authentication

    - by beakersoft
    We are setting up a new proxy based on squid on an ubuntu server, and would like to have pass through authentication work for the Windows/Internet Explorer client. We have put the line into the squid.conf for squid_ldap_auth, but this prompts for a username and password in internet explorer. It does work ok once the user puts it in. Whats the 'best' (standard) way of using pass through authentication? Cheers Luke

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  • When compiling programs to run inside a VM, what should march and mtune be set to?

    - by Russ
    With VMs being slave to whatever the host machine is providing, what compiler flags should be provided to gcc? I would normally think that -march=native would be what you would use when compiling for a dedicated box, but the fine detail that -march=native is going to as indicated in this article makes me extremely wary of using it. So... what to set -march and -mtune to inside a VM? For a specific example... My specific case right now is compiling python (and more) in a linux guest inside a KVM-based "cloud" host that I have no real control over the host hardware (aside from 'simple' stuff like CPU GHz m CPU count, and available RAM). Currently, cpuinfo tells me I've got an "AMD Opteron(tm) Processor 6176" but I honestly don't know (yet) if that is reliable and whether the guest can get moved around to different architectures on me to meet the host's infrastructure shuffling needs (sounds hairy/unlikely). All I can really guarantee is my OS, which is a 64-bit linux kernel where uname -m yields x86_64.

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  • Testing the program in different OS

    - by Alex Farber
    I want to test my program by installing it in different OS versions. My development computer is Ubuntu. What other Linux versions can I test by installing them inside VirtualBox and running my program there? Though it is not critical for me right now, I want to try something different and see what happens. Also, what is the chance that the program running in Linux will work in the Unix OS? The program is not open source, I can distribute only pre-built binaries.

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  • Amount of RAM for a web-server user.

    - by Janis Peisenieks
    I'm curently hosting my clients web-sites on some vps servers. What I would like to know, how many visitors can use the multiple web sites concurrently, before I need to migrate each of the sites to their seperate servers? So in laymans terms, how much RAM does a web-page user take on average? For example, how many concurrent visitors can I have on my server, running an Apache server, with 512mb RAM?

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  • Android and Kernel-Modules...

    - by Nils Pipenbrinck
    So - Android is build on top of a stripped down linux system. Most of the convenient utilities are missing but all the basics are there. I can call insmod and rmmod. No problem. But where do kernel-modules and firmware files reside? I can't find any. there is no /lib/modules in the standard distribution. Problem: I need modules. For sure don't want to compile support for each and every usb-device in the world into the linux-kernel. Where should I put them?

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  • User start daemon .pid Permission denied

    - by kornnflake
    Trying to start a unicorn daemon as a non-root user but failing hard. Unicorn gives the the following error: directory for pid=/var/run/sinatra_test/sinatra_test.pid not writable So I made the following: sudo mkdir /var/run/sinatra_test sudo chown ruby:www-data /var/run/sinatra_test sudo chmod g+w /var/run/sinatra_test ls -ld /var/run/sinatra_test returns: drwxrwxr-x 2 ruby www-data 60 Oct 27 09:55 /var/run/sinatra_test What am I missing? Still getting Permission denied errors.

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  • ESX Root User Cannot Reboot Server

    - by jamesthigpen
    I have a machine running ESX v3.5 and the root user is unable to perform tasks like shut down the esx server, create new VM's, manage roles, pretty much everything except for starting and stopping VM's. How do I (re)set these permissions?

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  • What makes a sexy UI?

    - by nimo
    I'm in the progress of remaking one our products user interface to be more modern and apealing aswell as user friendly. It's a web based application that is used by all types of people. My question for you is what do you think are the key factors of a sexy interface? An interface that is appealing and leave the user with a WOW feeling?

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  • User permission settings on DNS with windows 2003 server R2 standard edition

    - by Ghost Answer
    I have windows server 2003 r2 standard edition and some XP OS clients systems. I have created the DNS and profiles for all user. Now I want to authorized some users to installation of softwares, remove softwares and other such kind of things. How to I make such kind of policies for all different users on DNS. Please help me. May be this question can be same for another but I didn't get the solutions.

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  • GPU Computing - # of GPUs supported

    - by TehTypoKing
    I currently have a desktop with 6 GPUs ( 3x HD 5970s ) in non-crossfire mode. Unfortunately, it seems that Windows 7 64bit only supports up to 4 GPUs. I have not been able to find a reliable source to deny or confirm this. If windows 7 has this limitation, is there a Linux flavor that supports more than 4 GPUs? In-case you are wondering, this is not for gaming but high-speed single precision computing. With this current setup ( if I can find 6gpu support ) I am looking to reach 13.8 Teraflops. Also, my motherboard does support 3 16x pci-xpress gen2 slots... and I have a 1500w powersupply plugged into a 20amp outlet. Windows is able to detect all 6 cores.. although, 2 of which displays the warning "Drivers failed to load". To recap: - Can windows support 6 GPUs? - If not, does Linux? Thank you.

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  • Spawning and waiting for child processes in Python

    - by Brendan Long
    The relevant part of the code looks like this: pids = [] for size in SIZES: pids.append(os.spawnv(os.P_NOWAIT, RESIZECMD, [RESIZECMD, lotsOfOptions])) # Wait for all spawned imagemagick processes to finish while pids: (pid, status) = os.waitpid(0, 0) if pid: pids.remove(pid) What this should be doing is spawning all of the processes off, then waiting for each process to finish before continuing. What it does is work for the most part but sometimes crash on the next section (when it expects all of these processes to be finished). Is there something wrong with this? Is there a better way of doing it? The environment it has to work on is CentOS with Python 2.4, but I'm testing on Cygwin with Python 2.5, so it could be that it fails on my machine but will work on the Linux one (the Linux machine is very slow and this error is rare, so I haven't been able to get it on there).

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  • Sockets: RAW or STREAM

    - by user1415536
    May be the question is a bit stupid, but I'll ask it. I read a lot about raw sockets in network, have seen several examples. So, basically with raw sockets it's possible to build own stack of headers, like stack = IP + TCP/UDP + OWN_HEADER. My question is, is it possible to get some kind of ready frame of first two(IP + TCP/UDP) from the linux kernel and then just append own header to them? The operating system in question is linux and the language is C. I cannot find any function which can do such a thing, but may be I'm digging in a wrong direction.

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  • Windows Ribbon Framework: How to change font face and size?

    - by Ian Boyd
    How do you change the font face and font size used by the Windows Ribbon Framwork? Background The user can configure Windows to use their preferred font size, e.g.: 8pt 9pt 12pt and their preferred font face, e.g.: MS Sans Serif Microsoft Sans Serif Tahoma Segoe UI Calibri but the Windows Ribbon Framework by default uses a font that is not the user's preference. Additionally, the user could have specified their font preference in my application, which i want the Ribbon hosted in my application to honor.

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  • OSX Server - How to set environment variable on network user login

    - by tmkly3
    I have a group of users on my server, "Developers", and I would like an environment variable to be set for them whenever they login. More specifically, when anyone in this group logs in, I would like the equivalent of: setenv ANDROID_SDK_HOME /Developers/Android/User to be set at login. I can do this with a login script if necessary, but what I'm asking is: is it possible to set this type of thing in Profile Manager, Workgroup Manager, Directory Utility, etc? Thanks - I've looked everywhere but can't find anything.

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  • writing to a file in nasm using system calls

    - by yurib
    As part of an assignment I'm supposed to write to a file using system calls. Everything works fine except when I try to open the file in gedit (linux), it says it can't identify the character encoding. Notepad (on windows) opens the file just fine. Why doesn't it work on linux ? here's the code: section .text global _start _start: mov EAX, 8 mov EBX, filename mov ECX, 0700 int 0x80 mov EBX, EAX mov EAX, 4 mov ECX, text mov EDX, textlen int 0x80 mov EAX, 6 int 0x80 mov eax, 1 int 0x80 section .data filename db "./output.txt", 0 text db "hello world", 0 textlen equ $ - text thanks :)

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  • Problem in enabling mod_rewrite in Ubuntu.

    - by Rajan
    Hi, I am trying to change from windows to linux server. And for that i am trying to enable mod_write in ubuntu. I have taken all the necessary steps to enable the mod_rewrite as mod_rewrite is displayed under loaded modules. I have set all the permissions for the .htacess file. But for some reason the rewrite does not appear to be working in the linux server. It was working fine while i was using the same code in windows server. Can anyone please help me in this issue. Your help will be really appreciated. Thanks. Rajan.

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  • Prevent unauthorised write access to a part of filesystem or partition

    - by gaurav
    Hello all I have some very important system files which I want to protect from accidental deletion even by root user. I can create a new partition for that and mount it with readonly access but the problem is that I want my application which handles those system files to have write access to that part and be able to modify them. Is that possible using VFS? As VFS handles access to the files I could have a module inserted in the VFS layer which can see if there is a write access to that part then see the authorization and allow it or otherwise reject it. If not please provide me suggestions regarding how can such a system be implemented what would I need in that case. If there exists a system like this please suggest about them also. I am using linux and want to implement this in C, I think it would be possible in C only. Edit: There are such kind of programs implemented in windows which can restrict access to administrator even, to some important folders, would that be possible in linux?

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  • double fork using vfork

    - by Oren S
    HI I am writing a part of a server which should dispatch some other child processes. Because I want to wait on some of the processes, and dispatch others without waiting for completion, I use double fork for the second kind of processes (thus avoiding the zombie processes). Problem is, my server holds a lot of memory, so forking takes a long time (even the copy-on-write fork used in Linux which copies only the paging tables) I want to replace the fork() with vfork(), and it's easy for the second fork (as it only calls execve() in the child), but I couldn't find any way I can replace the first one. Does anyone know how I can do that? Thanks! The server is a linux (RH5U4), written in C++.

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  • Working with custom role in VB.NET win application

    - by fireBand
    Hi, I am looking for ways to implement custom user-roles in windows application with vb.net. I got a database table called Roles with Administrator and User entries. User cannot see some of the form data. In ASP.NET MVC we can do like. [Authorize(Roles = "Administrator")] public function GetAccount() as Array End Function If it could be done this way that would be great. Thanks in advance.

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