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  • how to tune libstdc++ to the native architecture when building gcc

    - by John D
    I recently found that when I build my C++ software, I get about a 10% speedup by using the g++ march=native option. When compiling gcc and libstc++, is it possible to tune the libstdc++ library to the native architecture as well? I couldn't find any mention of this in the gcc install configuration documentation. (I'm building gcc 4.6.2 on Linux Mint 11 with an Intel Core i7 Sandy Bridge-E processor.)

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  • VirtualBox (Windows XP guest on Ubuntu host) through X11?

    - by Roy Rico
    I'd like to host a VirtualBox instance on my Ubuntu machine, using Windows XP as my Guest machine. I'd like to know if I can use an X11 ZZZZZZZZ (Xming/Putty/SSH -X) to run VirtualBox on my Windows 7 machine remotely. Also, if it is possible, could I disconnect from it (while it's still running) and reconnect to it from a different machine?

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  • Hosting multiple email domains on single server

    - by sharjeel
    Is it practically possible to host multiple email domains on a single machine with single IP address? Considering that spam filters do RDNS and in that case one IP address may host only one domain to pass the spam filters. If not, how does the hosted email work? Do they have get a separate IP address for each domain's email they host?

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  • Launch only the command if the previous one worked inside SSH, SHELL

    - by Namari
    I've got a SHELL script which is using a pipe to separate my 2 commands: ssh -oBatchMode=yes user@hostname "mysql -u yop -pyop -c yop | echo test" The problem is even if my connection to mysql doesn't work, it send the echo test. I would like to forbid my script to send any command if the previous command doesn't work. I search with a if condition but it seems it not possible with it :( Does anyone have an idea ? Thanks, Namari

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  • Connecting a 2560x1440 display to a laptop?

    - by tjollans
    Having read Jeff Atwood's blog post on Korean 27" IPS LCDs, I've been wondering to what extent these are useful in a notebook + large display situation. I own a Lenovo Thinkpad Edge E320 with 2nd gen. integrated Intel graphics. According to the spec from Intel, this should support HDMI version 1.4, and, using DisplayPort, resolutions up to 2560x1600. HDMI version 1.4 supports resolutions up to 4096×2160, however, according to c't (German), the HDMI interface used with Intel chips only supports 1920x1200. The same goes for the DVI output - dual-link DVI-D, apparently, is not supported by Intel. It would appear that my laptop cannot digitally drive this kind of resolution. Now what about other laptops? According to the article in c't above, AMD's integrated graphics chips have the same limitation as Intel's. NVIDIA graphics cards, apparently, only offer resolutions up to 1900x1200 over HDMI out of the box, but it's possible, when using Linux at least, to trick the driver into enabling higher resolutions. Is this still true? What's the situation on Windows and OSX? I found no information on whether discrete AMD chips support ultra-high resolutions over HDMI. Owners of laptops with (Mini) DisplayPort / Thunderbolt won't have any issues with displays this large, but if you're planning to go for a display with dual-link DVI-D input only (like the Korean ones), you're going to need an adapter, which will set you back something like €70-€100 (since the protocols are incompatible). The big question mark in this equation is VGA: a lot of laptops have it, and I don't see any reason to think this resolution is not supported by the hardware (an oft-quoted figure appears to be 2048x1536@75Hz, so 2560x1440@60Hz should be possible, right?), but are the drivers likely to cause problems? Perhaps more critically, you'd need a VGA to dual-link DVI-D adapter that converts analog to digital signals. Do these exist? How good are they? How expensive are they? Is there a performance penalty involved? Please correct me if I'm wrong on any points. In summary, what are the requirements on a laptop to drive an external LCD at 2560x1440, in particular one that supports dual-link DVI-D only, and what tools and adapters can be used to lower the bar?

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  • Can I have a virtual firewall forward packets to another virtual machine on the same server?

    - by cowgod
    I currently have a web server running Apache using iptables for a firewall. What I would like to do is setup a new machine with XenServer and install two virtual machines--one running IPCop and one running Linux with Apache. Then I would configure IPCop to have the external IP address and forward port 80 to an internal IP on the second virtual machine. Is this even possible?

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  • How to access an IP address as if on a different network using SSH

    - by NT3RP
    In preparation for a lengthy business trip, I set up my router such that I can access my home computer over the internet via port forwarding over SSH. One thing I neglected to do was setup access to my router remotely. Normally, I can just access the router configuration page via 192.168.1.1. I know that it's possible to tunnel traffic through SSH, but how do I access an IP address as if I were on my home network using SSH?

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  • Directly reading a LTO tape drive

    - by John
    On our server (M$ 2003) is it possible to directly read our LTO 4 tape drive and copy the entire ntbackup created bkf file on it to an external hard disk? (Is the tape backup even stored on a tape as a bkf file, I’m going off when we only used external usb HD’s.)

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  • Free space on Dedi' in CentOS

    - by Trance84
    It will sound stupid but i need to figure out how much disk space i have in my dedicated server, it runs CentOS6...the last command i issued was this [root@ks34900 ~]# df -h Filesystem Size Used Avail Use% Mounted on rootfs 9.7G 6.4G 2.9G 69% / /dev/root 9.7G 6.4G 2.9G 69% / none 1000M 288K 1000M 1% /dev /dev/sda2 914G 200M 868G 1% /home But again, stupid as it may sound... i cant figure out how much space i have in "/" folder (root) And is it possible that "/usr" have a different space (partition)?

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  • import svn history

    - by Corey Watts
    I had to wipe our svn server, but I failed to "dump" the repositories before installing a new OS. However, I had a complete backup of every file in each repository. I've since transferred all the old files back over. Unfortunately the version history is completely gone. I still have all the old incremental files, and svn can see each revision with the "verify" command, but I'm wondering if it is possible to import the old history directly from the actual files (not a dump file)?

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  • How can I create a short cut to a directory on a Windows Phone device?

    - by Mokilok
    When I plug in my Windows mobile it appears in My Computer as a portable device but the data I need regular access to is many sub directories in. Is it possible to create a shortcut or access a path on a mobile device directly? When I open the properties of the folder I want it says the location starts with "Computer\Name of Phone\Phone\". The problem is using that as a path to navigate straight to the files doesn't work. Thanks for your help.

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  • sccm with distributed clients not in AD

    - by alex
    Hi guys, Before I go through learning about sccm can you guys tell me if it is possible to update and organize Pos systems, windows updates, software updates, which are not within an ad domain...How does this work is it workgroup etc. and online links much appreciated.... Cheers

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  • How can I move the Windows 8 on-screen keyboard?

    - by Vladimir Sinenko
    From the first look, it seems that the onscreen keyboard in Windows 8 cannot be moved from its default position at the bottom of the screen: However, sometimes it obstructs the input field and should be repositioned (see iOS 5's screenshots for examples) So the question is, can it actually move? If it can, how can I do that? If it cannot, is it possible to use the keyboard to fill an input field that is underneath it?

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  • Active Directory GPO - New Password Rules

    - by Chris Gunner
    In implementing a GPO for Active Directory, a colleague has mentioned that they have implemented one which disallows 'similar' new password to be chosen - i.e. 'password1' cannot be changed to 'password2'. Seeing as AD stores all passwords as hashes, and a hash of the two options above would be markedly different and certainly not related - how can this be possible?

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  • Tomcat - Spring Framework - MySQL, Load balancing design

    - by Mat Banik
    Lets say I have Spring Framework App that is running on Tomcat and uses MySQL database: What would be the best solution in this instance that would allow for sociability (price/performance/integration time)? More precisely: What would be on the Web Load balancer box, and who should be the tomcat web server clustered? What would be on the Database Load balancer box and how should be the database servers clustered? And if at all possible specific technical integration links would be of great help.

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  • How can I get HAProxy backends to include a path

    - by Michael Neale
    When using HAProxy for virtual hosting, I can see how to use the Host from the header at the front end to decide what backend to route to. However, is it possible to make the back end be a URL which includes a path (not unlike what you would do with apache or nginx when setting up virtual hosting). http://www.techrawr.com/tag/haproxy/ - shows most of it. But what if the back ends were on the one server but with backend1 and backend2 as the servers?

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  • nginx config to serve as external secure proxy

    - by realworldcoder
    I'm setting up an external nginx server to proxy all outgoing traffic in order to simplify outbound firewall rules. What I'd like is: https://service1.com.example.com -- https://service1.com:443 https://www.service2.com.example.com -- https://www.service2.com:443 https://service3.com.example.com -- http://service3.com:8080 (everything else denied) (There will be 30-40 different hosts here, so I'm looking for something relatively easy to maintain.) Is this possible with Nginx? Or is there some other proxy software that is better suited for this problem?

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