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• Benefit of using multiple SIMD instruction sets simultaneously

  - by GenTiradentes

  I'm writing a highly parallel application that's multithreaded. I've already got an SSE accelerated thread class written. If I were to write an MMX accelerated thread class, then run both at the same time (one SSE thread and one MMX thread per core) would the performance improve noticeably? I would think that this setup would help hide memory latency, but I'd like to be sure before I start pouring time into it.

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• ethernet not working

  - by good boy

  i wanted to know how do i setup an ethernet connection on a laptop,my isp gave me a telephone like cable which fits the ethernet port. i guess its the ethernet cable. when i connect it, nothing happens on the pc the ethernet card(realtek pcie gbe family controller) says cable not plugged in. i am using wired connection for first time.the system is completely stable with softwares .the drivers are also automatically updated through a manufacturer installed update system. the isp says there must be some sort of light on the port. whats the problem? how do get it working.

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• Leightweight Linux distro to install on my old PC

  - by Juri

  Hi, I have an old PC at home which is mainly used by my Mom or my brother just to browse the web and maybe open some PDFs / docs. Till now I had Win2000 installed, but it performs very poorly. So I thought about installing Linux on it. Could someone give me some suggestions for a leightweight Linux distribution which works well?? Is standard Ubuntu too heavy?? PC details CPU: Athlon AMD ~1211 MHz RAM: 1GB Grafics Card: NVidia GeForce FX 5200 (not so relevant,but still) Thx for your suggestions.

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• Chromebook, Crouton & “External Drive” is it possible to rename the folder?

  - by Cyril N.

  I have a Chromebook where I installed Crouton. I have plugged an SD Card and Chromebook detects it as "External Drive". In my Ubuntu instance, it's located at /media/removable/External Drive/ but this poses some problems for executing some applications I have installed on that external drive. In order to fix the problem, I need to remove all the spaces in the path, which is located in "External Drive". My question is simple, is it possible to move/rename the mount name "External Drive" to something else and doing it automatically at every mount/boot ? Thank you for your help !

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• SuperMicro IPMI through OpenBSD PF Firewall

  - by thelsdj

  I'm trying to access a SuperMicro IPMI card that is behind an OpenBSD bridged firewall. A couple pieces of information: The OpenBSD firewall itself has a SuperMicro IPMI that I can access across the internet. The IPMI I'm trying to reach can be reached from behind the firewall. My gateway does arp request the IPMI and it does appear to respond (this is from the external interface of the firewall) 16:57:45.548892 arp who-has ipminame tell gwname 16:57:45.549500 arp reply ipminame is-at ipmimac But when I make a request to the IPMI IP from outside the firewall the external interface of the firewall shows no traffic with the IPMI ip as its destination. Any idea what might be causing this problem? Is there something about IPMI traffic that my gateway wouldn't like (the gateway is provided by my colocation provider so I can't easily debug it).

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• Differnce between linux write and sendfile syscall

  - by JosiP

  Hi Im programming webserver (C), which should send big files. My question is: What are the main differneces in two syscalls: write and sendfile. Does sendfile depends on size of socket system buffer ? I noticed that write often writes less then i requested. For example, if got many requests for one file: should i open it, copy into memory and use 'write', or maybe i can do 'sendfile' for each client ? thx in advance for all answers

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• Digital Blue Digital Movie Creator 3.0 driver

  - by user27977

  I'm having a complete 'mare of a time trying to use my schools Digital Blue cameras. We've got the model 3 ones, but can't find the driver disc and using the Windows Hardware Installation Wizard gets me no where! Can you help me to find the driver? When I've used it at my old school it had a piece of software called the Digital Movie Creator, which I've heard you can use to make stop-motion films, which is what I want to do! This is what it looks like http://www.amazon.co.uk/Digital-Movie-Creator-1GB-Card/dp/B000LP30LA/ref=sr_1_2?ie=UTF8&s=software&qid=1265928833&sr=1-2

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• Offline installer for Windows 8?

  - by duncan12

  I have a computer repair service, and can see a few more people wanting Windows 8 updowngraded. Because of New Zealand's internet speeds it takes 1-2 hours to run the download part of the official Windows 8 upgrade tool. This means I have to go back to people the next day. I would like to keep an "offline" version of the Windows 8 upgrade tool on my flash drive, so I can avoid this inconvenience. Obviously it would still require a legit credit card etc, it just comes with the download part not needed. I cannot find such a tool. Does one exist?

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• VirtualBox networking problem, host XP, guest Debian

  - by Silma

  Hi, I'm trying to set up a development environment in a virtual machine on my laptop, with debian os. I have both lan and wlan available on the host machine, yet I can't connect to the internet using either. As I said the host OS is windows XP and the guest OS will be the latest Debian, we downloaded the business card net install so we need internet access from the beginning, besides we need the virtual machine to be visible on the local network (for my fellow developers). We tried host-only networking, NAT, bridging, with proxy (the local network uses a proxy to connect to the internet) and without proxy, nothing seems to work. What else can we do? Thanks a lot.

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• Garbage collection in Perl

  - by srikfreak

  Unlike Java, Perl uses reference count for garbage collection. I have tried searching some previous questions which speak about C++ RAII and smart pointers and Java GC but have not understood how Perl deals with the circular referencing problem. Can anyone explain how Perl's garbage collector deals with circular references? Is there any way to reclaim circular referenced memory which are no longer used by the program or does Perl just ignores this problem altogether?

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• Any way to stop VMWare workstation from dropping SSH connections?

  - by oljones

  I have VMWare workstation 8 with a few Linux guests. I have had problems maintaining an active SSH connection to my VMs when they are in bridged mode. I first read that the onboard realtek network cards were not well supported so I bought a Intel Pro/1000 GT card. This supposedly had support. But this made no difference. Connections via SSH are active for about the first 3 minutes then hang and die. I have changed the TCP Checksum offload on the Intel and Realtek NICs, but this only works some of the time and even then not for very long. The best I could do was about 20 minutes before the connection was dropped. Any ideas?

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• Program shortcuts disappearing in Windows Mobile 2003, any way to get them back?

  - by Carlisle White

  I have a WM2003 device with some programs installed on it and a full backup created and saved to a SD card. If the device runs out of charge for some time (or the battery removed) everything is reseted back to defaults, so the custom programs and configs are gone. When this happens I used to restore the full backup to put everything back to normal again. But I've recently installed TomTom Navigator 7 and for some reason, its shortcut in the "Programs" section is not saved when creating a full backup (with the eBackup app provided) and the installation doesn't create a shortcut in the main screen (as version 6 used to do). Is there any way to make this shortcut persistent? Is there any way to create custom shortcuts in the programs section or in the main screen (preferably)? Thank you very much for your help, anything is welcomed.

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• Should I worry about circular references in Python?

  - by bodacydo

  Suppose I have code that maintains parent/children structure. In such a structure I get circular references, where child points to parent and parent points to child. Should I worry about them? I'm using Python 2.5. I am concerned that they will not be garbage collected and the application will eventually consume all memory. Thanks, Boda Cydo.

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• Linux and GeForce 8400 dual monitor

  - by Andrea Polci

  I'm trying to install a linux distribution on my PC. I have a GeForce 8400 GS with two connected monitors. I tried with Fedora 12 and Ubuntu 9.10 (both 64 and 32 bit) and the live cd cannot boot properly. I don't get a visible error on Ubuntu, it simply hangs up during the boot. With Fedora I get this error: [drm] Modeset on unsupported output type [drm] Table 0x0000 not found for 1/1 using first I tried to disconnect one of the two monitor and was able to install on my HD and boot from there, but if I try to connect the second monitor again I cannot boot. Do I need to install something else? (a driver for my video card for example).

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• How to simulate a USB drive

  - by rursw1

  Hi all, Is it possible to simulate a USB drive with software only? I mean, for example, to expose a local memory space to the OS so the device manager will recognize it as a USB device. I'm not familiar with hardware implementation, but I'm sure that it is possible somehow to emulate the USB protocol. I began with this book - USB Design By Example. Can anyone please give me additional references to begin with? Thank in advance!

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• Remove an element from an xml File using jdom

  - by Llistes Sugra

  I have a 300 KB xml file with 70 elements in it. I need to be efficient upon removing one of the root's elements. What is the best approach? Should I detach the element in memory, save it and overwrite it by moving it? Is there a better option? I like org.jdom but any improvement is welcome

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• unable to install new versions of linux on my PC

  - by iamrohitbanga

  I have an MSI-RC410 motherboard with onboard ATI Radeon XPress 200 series Graphics card. I have used OpenSuse-11.0 on my PC for over an year. but when I tried to upgrade to OpenSuse-11.1, I managed to install it only to find that several features were missing. for example /dev/cdrom was missing. Also install DVD of Fedora 11 did not work. I have also tried Ubuntu-9.10 live cd. When I boot from the CD i get the initramfs command prompt. Still able to install old versions of these OSs. What is the reason for this behavior? Does it have to do anything with the new version of the linux kernel not being compatible with my hardware? What should i do to install new versions of Linux?

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• Android, store a couple of wav files.

  - by Dimitry Hristov

  I'm generating about 6 wav audio files at runtime. I want to store them in internal memory. Is a blob to sqlite the right/recommended way?

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• Fullscreen Video stutters on second monitor laptop

  - by nobrandheroes

  Fullscreen video on my new 1080p monitor is choppy when it comes from my laptop. The same video plays when not full screen. This goes for all video(Flash/MKV, etc), regardless of video resolution. I have an ATI Mobility Radeon HD 4200 Series card in my Thinkpad Edge, Turion X2 2GHz. The computer plays 1080p fine. Things I've tried: Updating Drivers Switching cables Turning Hardware Acceleration Changing video players process priority Rebooting Turning of laptop screen Turning off unused processes Nothing Works. What is the likelyhood that my laptop cannot power a 1920x1280 display?

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• Caveats of select/poll vs. epoll reactors in Twisted

  - by David

  Everything I've read and experienced ( Tornado based apps ) leads me to believe that ePoll is a natural replacement for Select and Poll based networking, especially with Twisted. Which makes me paranoid, its pretty rare for a better technique or methodology not to come with a price. Reading a couple dozen comparisons between epoll and alternatives shows that epoll is clearly the champion for speed and scalability, specifically that it scales in a linear fashion which is fantastic. That said, what about processor and memory utilization, is epoll still the champ?

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• Enabling 8021q on a nic

  - by Chris Phillips

  Hi, I'm trying to get a vlan interface on a bonded nic (Centos 5.5) and whilst the interface has been very happily created with vconfig I'm seeing no traffic on it at all. Running tcpdump and tshark on the underlying eth0 I see no sign at all of vlan tags in the traffic, and I'm wondering if there's somethign I'm missing on the server side as the network dept say they are sending me the tagged data. I've got the 8021q module loaded, however under lsmod it shows it's only being used by the cxgb3 module, for an unused onboard iSCSI card, whereas my nics (on an HP DL380 G7) are driven by bnx2 and e1000e modules. Should these modules be listing 8021q as used module? should I have something conrete in /etc/modprobe.conf? Thanks Chris

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• make vnc server listen on guest's ip address

  - by gucki

  My host system has the IP 192.168.0.250. Now I want to create a kvm guest using a tap device (so the network card of the guest just acts like a "real" one). The guest has a static ip 192.168.0.249 which it setups on his own (no dhcp). To connect to the guest using VNC I can to use the host's IP. So far everything works fine. Now I wonder how I can make the VNC server to listen on the guest's IP address, so I can use the guest's IP address to connect using my vnc client. Of course I cannot use -vnc 192.168.0.249:1 as this IP is not active on the host and so fails with Cannot assign requested address. Can this be done with tap networking at all? If not, how to get it working?

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• Simple Fundamental Algorithm Question, binary tree traversal

  - by Ben

  I'm trying to explain to non-computer science major student with many questions. (1)What traverses tree? Is it just logic or actual on off switch generates 1s and 0s traveling the circuit board? where is this tree and node exists CPU/Memory in between? (2)If it is 1s and 0s HOW the circuits understand the line for example p=p.getLeft(); I said search the google or wiki.

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• Lazy load pages in UIScrollView

  - by jean

  I have a UIScrollView that contains large images and am using paging to scroll between images. In order to save memory, I am loading only one image before and after the currently visible one and loading/releasing new images after a scroll has completed. The problem occurs when one scrolls quickly and scrollViewDidEndDecelerating is not called. How can I detect continuous scrolling? I could check item location on every scrollViewDidScroll but this seems a bit heavy...

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• Missing eth0 configuration file

  - by Godric Seer

  I have two servers both running Scientific Linux 6 on the same network. Since I want SSH access to both of them, I want to give them both static IPs so I can setup port forwarding and not worry how my router assigns local IPs. I found that I need to edit the configuration file /etc/network-scripts/ifcng-eth0, however that file does not exist. The network card works fine, and I am able to ssh as long as I access the router and find the local ip. Can I simply make my own configuration file, or did I miss some step in configuring the system that I need to complete?

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