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  • Caching in mmap

    - by myahya
    I am using mmap call to read from a very big file using simple pointer arithmetic in C++. The problem is that when I read small chunks of data (in the order of KBs) multiple times, each read take the same amount of time as the previous one. How can I know if the disk is being accessed to fulfill my request or whether the request is being fulfilled from main memory (page cache) in calls after the first one.

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  • Windows XP Disc: corrupt or not corrupt?

    - by Wesley
    Hi all, I just finished one of my builds and am trying to install Windows XP onto it. Here are the specs beforehand... Intel Pentium 4 Northwood 2.4 GHz (512KB L2, 533MHz FSB) QDI Superb 4 Motherboard 2x 1GB PC3200 DDR RAM Seagate 80GB IDE HDD Bestec 250W PSU 16MB NVIDIA TNT2 Pro Samsung DVD-ROM USB 2.0 PCI Card Generic PCI Modem The issue right now is that when I'm running through the Windows Setup from my XP Pro SP3 disc, partway through the setup says that a random file on the disc is corrupt and the computer needs to be restarted. Every time I tried booting it up, a different file was noted as corrupt. However, I tested the same disc on another computer and the Windows XP disc ran to the end of the setup screen without error. I tried this on another computer and the same thing. What could possibly be happening on this one build to cause it errors during the Windows Setup? Thanks in advance.

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  • Hardware needs for video conversion server

    - by artaxerxe
    I would need to build a Linux server that will have as its main task to perform the video conversion. For video conversion, the most likely I will use FFMpeg tool. Question: Can anyone tell me if for improving this automated video conversion a video card will improve the process or not? The idea is that I will get movies at a very high quality that I will need to be converted in formats available for different devices (iPhone, iPad, etc.). That conversion will be performed through a CLI (command line interface). I will need that conversion to be done in the least time possible (ok, that's a kind of saying, not an absolutely specified short time).

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  • Wake on Lan/Wan won't work after some time has passsed

    - by Vian Esterhuizen
    I have the following set up: Gigabyte Z77X-UD5H Wake On Lan Enabled Asus N66U Port Forwarding Static IP assigned to my computer Windows 7 Advanced Power Management - PCI Express - Off Intel 82579V - All options under Power Management checked I'm trying to set this up for Wake on Wan capabilities. If I shut down my computer and immediately try to Wake on Wan (and Lan) it works and starts up. While the computer is on, I've used a few WOL specific packet sniffers and the packet comes through on the correct port. After any period of time over a few minutes, waking on Wan or Lan won't work. The back "activity" light is blinking on my ethernet port on my computer, as well as on the router, so I would assume the network card is on and able to receive a signal. Any ideas? Suggestions? What can I do to troubleshoot the problem?

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  • Not working WEP key in Ubuntu

    - by stupid-idiot
    This time I've got some problem with connection to the internet from my old laptop with ubuntu, I already had some problems with setting up the radio on my network card but I think it works now since it finds some wireless networks. The problem is that I can't connect to my router via wi-fi even if I'm hundred-percently sure the wepkey I punch there is correct, it works via LAN though. Also, I'm not able to ping myself with 127.0.0.1. I'm sorry to say it but I don't think I can stand this shitness for much longer. Although it's much much faster than Windows it's useless since i can't download any libraries for development. If anyone has any experience with this, even indirect, please leave your answer or comment thx

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  • Max file size for File.ReadAllLines

    - by user283897
    Hi, I need to read and process a text file. My processing would be easier if I could use the File.ReadAllLines method but I'm not sure what is the maximum size of the file that could be read with this method without reading by chunks. I understand that the file size depends on the computer memory. But are still there any recommendations for an average machine? I would greatly appreciate your fast response. Thanks, Lev

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  • Are there any drawbacks to using helper :all in Rails

    - by Rob Jones
    In Rails 'helper :all' makes all your helpers 'available' to all your controllers. This is concise and convenient, but does it have any memory and/or performance implications compared to explicitly calling the helpers that each controller actually needs? It's unclear form the docs whether using it involves 'require'ing all those files, or whether autoload is being used. I can't tell from the source in the Rails framework docs. thanks

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  • Char* vs std::string

    - by Lockyer
    Is there any advantage to using char*'s instead of std::string? I know char*'s are usually defined on the stack, so we know exactly how much memory we'll use, is this actually a good argument for their use? Or is std::string better in every way?

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  • Teamed network cards on a Proliant Server

    - by Matt
    We have 4 network cards in a Proliant server with Server 2008R2 running Exchange 2010, with 1 card set to a static IP address and the other 3 set to DHCP. I just need some clarification as I have not teamed network cards. Do all the network cards need to have a static IP when I set as a team. The connection that has the static IP is the IP that I need to use for the Server. Is it possible to set the teamed cards to the same static IP or do I have to change the static IP to another IP then use it for the teamed IP? I will be using HP Network Configuration Utility to set this up.

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  • Why screen freezes in Windows 7 and Vista?

    - by Hasan Gürsoy
    On Windows 7 and Vista I use auto-hide task bar and turn off graphic card after 1-2 minutes. When I want to use my desktop again screen freezes sometimes for 10 seconds. What I do does not effect anything immediately but cursor moves. For example if I click Firefox bookmark it opens when screen unfreezes. This happens at any of my computers and about a month after new installation. I don't think that problem is related with the drivers.

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  • How do Relational Databases Work Under the Hood?

    - by Pierreten
    I've always been interested in how you can throw some SQL at at database, and it nearly instantaneously returns your results in an orderly manner without thinking about it as anything other than a black box. What is really going on? I'm pretty sure it has something to do with how values are laid out regularly in memory, similar to an array; but aside from that, I don't know much else. How is SQL parsed in a manner to facilitate all of this?

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  • How can i solve out of Exception error in list generic ?

    - by Phsika
    How can i solve out of memory exception in list generic if adding new value foreach(DataColumn dc in dTable.Columns) foreach (DataRow dr in dTable.Rows) myScriptCellsCount.MyCellsCharactersCount.Add(dr[dc].ToString().Length); MyBase Class: public class MyExcelSheetsCells { public List<int> MyCellsCharactersCount { get; set; } public MyExcelSheetsCells() { MyCellsCharactersCount = new List<int>(); } }

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  • IP Camera working on lan but not on internet

    - by Kevin Boyd
    My IP cam model is Genius 350TR, I tested the cam at home on lan and internet and it worked. Then I shifted it to an office. It works on the office lan setup but I cannot connect to the ip cam from home. The IP cam is configured for port 192.168.0.30:7070 and it has a port forwarded to publicIP:7071 When I telnet to that public IP it connects to that port. However when I try to access the ip cam from a web browser it only shows me the configuration page and settings and the video is blank and it says connecting for some time and then says disconnected. The cam is configured for HTTP on internet and UDP on Lan. The office setup is ISP --- WifiRouter --- PC With Wifi card --- Switch --- IP CAM Is there a way to debug this problem?

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  • How to enable printer settings over Jetdirect on HP 4100N

    - by zsero
    I have a HP 4100N printer and I am using it over network. Previously I was able to access the printer settings over internet, but now the only thing visible is Device Info and Networking. I can connect to the web server and I can set all the network related settings, but that's not what I want. There should be a supplies, config, print info, etc. page, what are not visible now. Can you tell me what setting should I set to enable this printer config page on the webserver? The printer is a HP 4100N and the network card is J4169A (Jetdirect 610n).

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  • Third monitor randomly defaults to 640 x 480 on startup

    - by andybaird
    I purchased a PowerColor HD 5770 video card so I could get a third monitor working. I have two widescreen monitors, one attached via HDMI and the other attached via DVI. My third monitor is attached from DisplayPort to VGA (using a passive connector like this one) The third monitor is a 19" Hyundai L90D. I was unable to find any Windows 7 (or Vista for that matter) drivers for the monitor, so it's stuck with "Generic Non-PNP Monitor". It's native resolution is 1280 x 1024. Randomly Windows will boot up in the correct native res, but sometimes it boots up in 640 x 480 res. When it does boot up into 640 x 480 res, the screen resolution slider is stuck and I cannot slide it back to 1280 x 1024. I cannot find a pattern for when or why it will do this, I've tried rebooting five or six times in a row at times to get it to boot into native res, but this doesn't always work.

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  • Convert large raster graphics image(bitmap, PNG, JPEG, etc) to non-vector postscript in C#

    - by Dennis Cheung
    How to convert an large image and embed it into postscript? I used to convert the bitmap into HEX codes and render with colorimage. It works for small icons but I hit a /limitcheck error in ghostscript when I try to embed little larger images. It seem there is a memory limit for bitmap in ghostscript. I am looking a solution which can run without 3rd party/pre-processing other then ghostscript itself.

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  • Efficiency questions

    - by rayman
    Hi, I have to manage XML documents and Strings in my app. In terms of efficiency and memory usage, will a collection like ArrayList be much more expensive than String[]? Also, I could store the content as a regular String or XML. Is working with XML also more expensive? (When I say expensive, I am referring to the use of system resources.) If there are differences, are they significant? Thanks, Ray.

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  • Play system sounds from one computer through another computer's speakers?

    - by kevinconner
    I have a Mac and a Windows PC at work. I use both at the same time with Synergy and SynergyKM, which is a great setup for me. The Mac has built-in speakers and the PC has a sound card, but no speakers. I don't want to get speakers for use at work; instead I'd rather just have all sounds from both computers play through the Mac's speakers. Is there some sort of audio service I can run on each computer to accomplish that? I would want: System alert sounds, like you configure in the Control Panel Sounds from videos in a web browser, including from Flash

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  • BT socket Device over Structured Cabling

    - by TheD
    Not sure if this is the right stack* site to post on but I believe cabling is a just subject. Essentially I have a Credit Card machine which is connected to a phone line via standard BT Socket. So basically, the port of the wall has a balun plugged in which takes the RJ45 outlet on the wall to BT, so I can plug the device in. This works fine, however I need the machine to be on the other side of the room so want to route it through my patch panel (strucutered cabling). How can this be done? So Device -- ? -- RJ45 port -- Patch Panel -- ? -- Balun out wall outlet Where ? is to be filled in ! :)

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  • MPEG2-TS streaming: UDP or RTP?

    - by Juan Jose Polanco Arias
    Hello I'm working on an IPTV streaming server in Linux (Ubuntu Server 12.04 LTS) that has a DVB-S/S2 card to obtain satellite channels. Then with MuMuDVB I map all channels in the transponder to a multicast group, for multicast transmission. Now for the MuMuDVB software I can either use UDP for transmission or I can add the RTP header. I was wondering what would be the most convenient for MPEG2-TS because I've heard that RTP is used primarily for MPEG4, but It's also said that RTP can be used for MPEG2-TS. Thanks for your help.

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  • LCD monitor reports incorrect maximum resolution

    - by SLaks
    I have four 20" Planar 2010M LCD monitors with a maximum resolution of 1600 x 1200 connected to two nVidia video cards (8600 GT and 7600 GS). I'm running Windows Server 2003 x86. Recently, two of the monitors have started mis-reporting their maximum resolution as 1280 x 1024. When this first happened, I used nVidia's Custom Resolutions feature to force the monitors back to 1600 x 1200. Yesterday, however, I upgraded nVidia's video card driver, and ever since, I cannot get the DVI one back to 1600 x 1200. When I add the custom resolution in nVidia's control panel, if I set either the width or the height to even a single pixel more than 1280 x 1024, nothing changes when I click Test (the monitor doesn't even flash black, although after 15 seconds, it flashes black and doesn't change). After adding Does anyone know what the problem is? Is there anything I can do about it?

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