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  • Why is Flash power-hungry?

    - by Doug
    Apple historically argued that Flash was power-hungry, which made it inappropriate for use on mobile devices. I always thought that was just bluster excusing Apple's exclusion of Flash support from their mobile devices. But now I see that Adobe acknowledges that Flash is a pig. Why is it a pig? Are there bad programming approaches (that can be explained in layman's terms) that make it so power-hungry?

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  • Allow access to my server.

    - by Zachary Brown
    I have a server, did some of the programming myself. It ison my home network, but I need to be able to access it from anywhere over the internet. I have done the port forwarding like I am supposed to, but I still cant get to it from an outside computer. It just displays Internet Explorer cannot display the webpage. I don't know what else to do. I am on a Linksys WRT54G v8 router running ddWRT v24 micro firmware.

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  • Why do Linux networks use Samba?

    - by Dougal
    The "file and printer sharing" feature of Linux distros is mostly Samba. Samba is an interpretation of Microsoft's network filesystem. Cross-OS compatibility is important of course but why are Linux systems defaulting to this Microsoft technology? Is Microsoft's network filesystem so good? Samba clearly works very well and I'm not "dissing" it. Or, to rephrase the question, "What would be a Linux-native way to share files and printers across a network?"

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  • Excel for programmers

    - by Rohit
    Recently as part of my job I have had to edit and create a lot of excel spreadsheets. I am familiar with some Excel formulas but while editing the spreadsheets I don't feel that I'm using the full potential of excel. Are there any books/online resources which guide someone with a programming background in Excel?

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  • How to edit a really large file in Windows [closed]

    - by Ankur
    Possible Duplicate: Text Editor for very big file - Windows NOt a programming question I know but related to a program I am writing, and probably a problem only likely to be encountered by programmers. I have a really big text file which I need to edit - just need to delete the first line. None of the standard windows programs can handle the 200MB+ file What is the best way to edit it?

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  • Using a SD card as a smart card for two-step verification for Mac logon

    - by Greg Brown
    What I am trying to do is create two-step verification to logon to my mac, one being that you would need to input a SD card (formated with special format or something) and then also have a password. Is there any software out there that could do this or any way of programming it so that once it reads the SD Card it makes the password bar visible for logon. Would it be easier to do it with Linux since it is open source? Any help in the right direction is appreciated. Thanks

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  • High I/O latency with software RAID, LUKS encrypted and LVM partitioned KVM setup

    - by aef
    I found out a performance problems with a Mumble server, which I described in a previous question are caused by an I/O latency problem of unknown origin. As I have no idea what is causing this and how to further debug it, I'm asking for your ideas on the topic. I'm running a Hetzner EX4S root server as KVM hypervisor. The server is running Debian Wheezy Beta 4 and KVM virtualisation is utilized through LibVirt. The server has two different 3TB hard drives as one of the hard drives was replaced after S.M.A.R.T. errors were reported. The first hard disk is a Seagate Barracuda XT ST33000651AS (512 bytes logical, 4096 bytes physical sector size), the other one a Seagate Barracuda 7200.14 (AF) ST3000DM001-9YN166 (512 bytes logical and physical sector size). There are two Linux software RAID1 devices. One for the unencrypted boot partition and one as container for the encrypted rest, using both hard drives. Inside the latter RAID device lies an AES encrypted LUKS container. Inside the LUKS container there is a LVM physical volume. The hypervisor's VFS is split on three logical volumes on the described LVM physical volume: one for /, one for /home and one for swap. Here is a diagram of the block device configuration stack: sda (Physical HDD) - md0 (RAID1) - md1 (RAID1) sdb (Physical HDD) - md0 (RAID1) - md1 (RAID1) md0 (Boot RAID) - ext4 (/boot) md1 (Data RAID) - LUKS container - LVM Physical volume - LVM volume hypervisor-root - LVM volume hypervisor-home - LVM volume hypervisor-swap - … (Virtual machine volumes) The guest systems (virtual machines) are mostly running Debian Wheezy Beta 4 too. We have one additional Ubuntu Precise instance. They get their block devices from the LVM physical volume, too. The volumes are accessed through Virtio drivers in native writethrough mode. The IO scheduler (elevator) on both the hypervisor and the guest system is set to deadline instead of the default cfs as that happened to be the most performant setup according to our bonnie++ test series. The I/O latency problem is experienced not only inside the guest systems but is also affecting services running on the hypervisor system itself. The setup seems complex, but I'm sure that not the basic structure causes the latency problems, as my previous server ran four years with almost the same basic setup, without any of the performance problems. On the old setup the following things were different: Debian Lenny was the OS for both hypervisor and almost all guests Xen software virtualisation (therefore no Virtio, also) no LibVirt management Different hard drives, each 1.5TB in size (one of them was a Seagate Barracuda 7200.11 ST31500341AS, the other one I can't tell anymore) We had no IPv6 connectivity Neither in the hypervisor nor in guests we had noticable I/O latency problems According the the datasheets, the current hard drives and the one of the old machine have an average latency of 4.12ms.

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  • How to Move Offline Files Cache in Windows 7?

    - by Portman
    On Vista systems, I've been using these instructions to relocate the "Offline Files Cache" from its default location of c:\csc. Works great. However, these instructions do not work on Windows 7. There is small discussion about the issue going on on TechNet but nobody yet has a solution. The problem is that the Migration Wizard has changed in Windows 7 and no longer provides a mechanism for doing this.

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  • Debugger for Iptables

    - by chris_l
    Hi, I'm looking for an easy way to follow a packet through the iptables rules. This is not so much about logging, because I don't want to log all traffic (and I only want to have LOG targets for very few rules). Something like Wireshark for Iptables. Or maybe even something similar to a debugger for a programming language. Thanks Chris

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  • Sysadmin Dress Code

    - by andyh_ky
    What kind of dress code do you have at work as a systems administrator? Business casual, casual, some days casual, some days business casual, formal? It's safe to say "it all depends on the type of day we're planning on having" - but what happens if you need to speak to some C level personnel? Do you have a spare set of clothes?

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  • Better graphics or better cpu on a budget laptop.

    - by jones
    Which would have better overall performance on a cheap (~$600) laptop; Intel Atom 330 with Nvidia ion or intel Pentium/Celeron with Intel graphics. I don't need 8 hour battery life and will hopefully be using this for programming/web browsing and occasionally light gaming.

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  • How to use AIM to communicate with a Google Talk user?

    - by altendky
    How do I allow someone that uses the AIM desktop client to chat with someone else using the Google Talk desktop client? Both systems are Windows XP. The trick is that I don't want to have them have to change clients. Long ago I used Trillian... then Pidgin and now Meebo. But these are not solutions to the question. Also note that the Google client is not the web gadget.

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  • Slow editor in Eclipse Galileo

    - by schneck
    Since I updated Eclipse from Ganymede to Galileo on Mac OS X 10.5, the editor is incredible slow, independently of the programming language: I tried Python and PHP, and for both, the editor scrolling is very slow, like on a very old computer (I'm using am up-to-date Macbook). Any idea where I could tweak it?

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  • Centos 5.5 [Read-only file system] issue after rebooting

    - by canu johann
    I have a virtual server under centos 5.5 (hosted by a japanese company called sakura ) Since yesterday, connection through ssh couldn't be established. I've contacted support center who told me to restart VS from the control panel. After restarting, I got the message below Connected to domain wwwxxxxxx.sakura.ne.jp Escape character is ^] [ OK ] Setting hostname localhost.localdomain: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda3 / contains a file system with errors, check forced. /: Inodes that were part of a corrupted orphan linked list found. /: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) @@cat: /proc/self/attr/current: Invalid argument Welcome to CentOS Starting udev: @[ OK ] Setting hostname localhost.localdomain: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda3 / contains a file system with errors, check forced. /: Inodes that were part of a corrupted orphan linked list found. /: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) [FAILED] *** An error occurred during the file system check. *** Dropping you to a shell; the system will reboot *** when you leave the shell. *** Warning -- SELinux is active *** Disabling security enforcement for system recovery. *** Run 'setenforce 1' to reenable. /etc/rc.d/rc.sysinit: line 53: /selinux/enforce: Read-only file system Give root password for maintenance (or type Control-D to continue): bash: cannot set terminal process group (-1): Inappropriate ioctl for device bash: no job control in this shell bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system (Repair filesystem) 1 # setenforce 1 setenforce: SELinux is disabled (Repair filesystem) 2 # echo 1 (Repair filesystem) 4 # /etc/init.d/sshd status openssh-daemon is stopped (Repair filesystem) 5 # /etc/init.d/sshd start Starting sshd: NET: Registered protocol family 10 lo: Disabled Privacy Extensions touch: cannot touch `/var/lock/subsys/sshd': Read-only file system (Repair filesystem) 6 # sudo /etc/init.d/sshd start sudo: sorry, you must have a tty to run sudo (Repair filesystem) 7 # I have 4 site in production and I need to restart the server quickly (SSH + HTTPD ,...). Thank you for your time.

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  • How to automatically define functions and aliases on remote server after ssh login

    - by Ramon
    I want to define bash functions and aliases in my remote shell automatically on login. I can't put the definitions into .profile or similar because the users I log in as are often shared with others who use the same systems and I don't have control of this. What I'm trying to do is execute a few bash function definitions in the remote process and then continue as a login shell. I tried this but it did not work: cat ~/.profile - | ssh -tt user@host bash -l Any ideas?

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  • Sync my files across multiple computers

    - by EnderMB
    I do a lot of work on my home computer, ranging from programming, writing stored procedures and writing documentation and reporting. A lot of this work is university related and constantly swapping files across several computers is annoying at best. I have a large final-year project coming up and I'm going to be sharing this work amongst home and university and require some kind of online storage that provides version control for my programs, as well as my Word documents, PDF's and saved academic papers. Are there any good solutions for my problem?

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