Search Results

Search found 120132 results on 4806 pages for 'thanks for help'.

Page 25/4806 | < Previous Page | 21 22 23 24 25 26 27 28 29 30 31 32  | Next Page >

  • Design help with parallel process

    - by brazc0re
    I am re-factoring some code and an having an issue with retrieving data from two parallel processes. I have an application that sends packets back and forth via different mediums (ex: RS232, TCP/IP, etc). The jist if of this question is that there are two parallel processes going on. I hope the picture below displays what is going on better than I can word it: SetupRS232() class creates a new instance of the SerialPort by: SerialPort serialPort = new SerialPort(); My question is, what is the best way that the Communicator() class, which sends out the packet via the respective medium, get access to the SerialPort object from the SetupRS232 class? I can do it with a Singleton but have heard that they are generally not the best design to go by. I am trying to follow SRP but I do feel like I am doing something wrong here. Communicator() will need to go out of it's way to get access to SetupRS232() to get access to the SerialPort class. I actually haven't found a way to even get access to it. Would designing each medium class, for example, SetupRS232(), SetupTCPIP, as a singleton be the best way to approach this problem?

    Read the article

  • Java @Contented annotation to help reduce false sharing

    - by Dave
    See this posting by Aleksey Shipilev for details -- @Contended is something we've wanted for a long time. The JVM provides automatic layout and placement of fields. Usually it'll (a) sort fields by descending size to improve footprint, and (b) pack reference fields so the garbage collector can process a contiguous run of reference fields when tracing. @Contended gives the program a way to provide more explicit guidance with respect to concurrency and false sharing. Using this facility we can sequester hot frequently written shared fields away from other mostly read-only or cold fields. The simple rule is that read-sharing is cheap, and write-sharing is very expensive. We can also pack fields together that tend to be written together by the same thread at about the same time. More generally, we're trying to influence relative field placement to minimize coherency misses. Fields that are accessed closely together in time should be placed proximally in space to promote cache locality. That is, temporal locality should condition spatial locality. Fields accessed together in time should be nearby in space. That having been said, we have to be careful to avoid false sharing and excessive invalidation from coherence traffic. As such, we try to cluster or otherwise sequester fields that tend to written at approximately the same time by the same thread onto the same cache line. Note that there's a tension at play: if we try too hard to minimize single-threaded capacity misses then we can end up with excessive coherency misses running in a parallel environment. Theres no single optimal layout for both single-thread and multithreaded environments. And the ideal layout problem itself is NP-hard. Ideally, a JVM would employ hardware monitoring facilities to detect sharing behavior and change the layout on the fly. That's a bit difficult as we don't yet have the right plumbing to provide efficient and expedient information to the JVM. Hint: we need to disintermediate the OS and hypervisor. Another challenge is that raw field offsets are used in the unsafe facility, so we'd need to address that issue, possibly with an extra level of indirection. Finally, I'd like to be able to pack final fields together as well, as those are known to be read-only.

    Read the article

  • Help w/ iPad 1 performance for tile-based DOM Javascript game

    - by butr0s
    I've made a 2D tile-based game with DOM/Javascript. For each level, the map data is loaded and parsed, then lots of tiles ( elements) are drawn onto a larger "map" element. The map is inside of a container that hides overflow, so I can move the map element around by positioning it absolutely. Works a treat on desktop browsers, and my iPad 2. My problem is that performance is really bad on iPad 1. The performance hit is directly related to all the tile elements in my map, because when I remove or reduce the number of tiles drawn, performance improves. Optimizing my collision detection loop has no effect. My first thought was to batch groups of tiles into containers, then hide/show them based on proximity to the player, however this still causes a huge hiccup when the player moves and a new group of tiles is displayed (offscreen). Actually removing the out-of-sight elements from the DOM, then re-adding them as necessary is no faster. Anyone know of any tips that might speed up DOM performance here? My map is 1920 x 1920 pixels, so as far as I know should be within the WebKit texture limit on iOS 5/iPad. The map is being moved with CSS3 transforms, and I've picked all the other obvious low-hanging fruit.

    Read the article

  • Ubuntu 12.10 update doesnt boot. (please help)

    - by Hugtrw
    my name is Anthony. I updated to 12.10 and it the OS will not load accept in "pae" under advanced options. I used the boot repair cd, the only thing that workds is the monodeset option in the kernel and the graphics are terrible, mouse disappears and unity will not boot. Ubuntu 12.04 Runs great, on a clean install of 12.10 Ubuntu 12.10 wont even load to install unless under monodeset. I get left a termial like screen with just a bilking bar. Im running a HP Compaq NC6400 Laptop, Ubuntu 32-bit, 2gb ram.

    Read the article

  • Ubuntu 12.10 will not boot!! please help

    - by Ishmael
    Okay ive been at this for about 6 hours now, linux has never given me problems before, im installing from an isodvd going from window7 to ubuntu12.10, the installation works fine, everything loads perfect with no problems and it asks me to restart when the installation is comeplete. After the computer shuts down and i remove the livecd as it tried to boot up i get an Error: no boot disk has been detected or the disk has failed. Ive tried updating grub from the livecd because it is the only way i can boot to anything atm, nothing has worked so far. Has anyone else had this problem??

    Read the article

  • 3 SQL Join Concepts to Help You Choose the Right Join

    What do SQL joins and the "teach a man to fish" Chinese proverb have in common? SQL joins, like regular expressions, are one of those commonplace programming tasks in which true success is entirely dependent upon your ability to conceptualize the outcome. Fail to do so and you'll likely wind up spending a few hours in a frustrating round of trial and error. Like regular expressions, the proliferation of online examples has actually contributed to the frustration, providing the equivalent of a day's worth of fish rather than the proverbial fishing pool. The Future of SQL Server MonitoringMonitor wherever, whenever with Red Gate's SQL Monitor. See it live in action now.

    Read the article

  • help me with my wine, it doesn't work proper

    - by Sebastian Raun Mikkelsen
    When i try to run something with wine, nothing happens! i have many problems with ubuntu so i have tried to get windows 8 back on the computer, but because ubuntu cant run exe files i cant open the installer. evenmore my computer cant boot from a CD/DVD anymore after i installed ubuntu, i turns op with a black screen with a blinking marker at the upper left corner of the screen and after 10 minutes it says something like " cant boot from the selected mediadevice - select another" so how to get windows back?

    Read the article

  • Begginer help: where to begin

    - by shad
    I want to learn how to program. A main stream programming languages like Java, C++/C# is my primary target. Current, i am a high school student and planning to take programming, Digital electronics courses next semester. My biggest problem is that I do not know where to start and I have no one to consult with. Should I take a course at my local community college this summer? and get some books or try learning from some internet websites? What would be the best option a book or website?

    Read the article

  • GPG and libpcap help

    - by Johnq
    I was trying to install the newest version of libpcap (as the version in the repositories doesn't seem current) and ran into the following problem. I copied the tcpdump-workers.asc text from the tcpdump website (which hosts libpcap as well) and imported the key to my keyring using gpg --import tcpdump-workers.asc. That when all well and fine but when I tried to verify the libpcap-1.4.0.tar.gz file against the key with gpg --verify, I ended up getting the message that unexpected data. was found. I am wondering if anyone else has run into this problem as the ancient technique of googling my problem has done little to answer my question.

    Read the article

  • I need help with background interaction with foreground

    - by luther t
    So basicly my game design idea is to have a still back. In the foreground is a PNG format spirite that the user has controll over it is on the ground and the user jump over the oncoming from the right to left spirites. kinda like jumping over rock while running...So the problem...I don't where start. whether with the background or foreground...basicly i am a noob at this as a whole. I am sure if i explained well enough...

    Read the article

  • Help with tracking sub domain

    - by roobus
    I currently have my app's marketing/external website on the root level, e.g. http://example.com My web app itself is hosted at: http://app.example.com What's the best strategy to set-up Google Analytics tracking for both of them? Should I create a separate web property? Also, what's the difference between creating a new web property and a new profile? UPDATE: I would want to be able to track conversion from a page on the root domain to a sign-up page on the app sub-domain.

    Read the article

  • apache2 and htaccess help

    - by user1052448
    For some reason domain.com/YYYY-MM-DD redirects to domain.com/var/htdocs/public_html RewriteEngine On RewriteCond %{HTTP_HOST} ^[^\./]+\.[^\./]+$ RewriteRule ^/(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L] RewriteBase / RewriteRule ^index\.php$ - [L] RewriteRule ^archive/index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^. /archive/index.php [L] trying to get anything after www.domain.com other than index.php and archive/index.php to display mysql content on archive/index.php (by grabbing PHP Request URI). The browser URL should remain www.domain.com/YYYY/MM/DD/blog-title or www.domain.com/YYYY/MM/ to display all posts from YYYY-MM

    Read the article

  • Please help me to improve Re-Sharper

    - by TATWORTH
    Re-Sharper is an excellent aid to producing good code in either C# or VB.NET. Recently through using Resharper and StyleCop, I have found three area where ReSharper needs to be improved. Please log into the YouTrack at http://youtrack.jetbrains.net and vote for the following: RSRP-268868 Improvement to removal of redundant else and invert if optimisations for enhanced stylecop compliance. When Resharper removes a redundant else, there needs to be a blank line added. Currently there is no provision to specify this. Please vote for this! RSRP-272286 Resharper Feature Request to move initialisation to static constructor Currently ReSharper offers moving initialisation of of non-static variable to a constructor. Why not offer the same for a static constructor?  Please vote for this! RSRP-272285 Expansion of Switch Statement by Resharper Currently ReSharper will fill an empty switch statement based upon an enumeration but will not add missing enumeration values to such a switch statement.   Can't code withoutCoding assistance, smart code editing and code completion for C# and VB.NET

    Read the article

  • error:unknown filesystem grub rescue help

    - by Ridvan Çoban
    I'm trying to install ubuntu on my hdd which doesnt contain any operatin system, mbr or grub. (it has 3 partitions, 1st includes my data on ntfs file system, second is linux swap now, and third ex4 filesystem) Of course i don't want to lose my data on ntfs partition. Anyway i installed ubuntu on ex4 filesystem, selected sda as device for bootloader (not sda1,2 or 2). But i got error Error:unknown filesystem Grub rescue I tried ls command. It gives (hd0) , (hd,msdos1), (hd0,msdos2) and (hd0,msdos3). then tried ls (hd0)/, ls (hd0,1)/, ls (hd0,msdos2)/, ls (hd0,msdos3)/ to find the linux filesystem to boot. But i was unsuccessful. it all gave me unknown filesystem error. Am i missing or something?

    Read the article

  • Help with MVC design pattern?

    - by user3681240
    I am trying to build a java program for user login but I am not sure if my MVC design is accurate. I have the following classes: LoginControl - servlet LoginBean - data holder java class with private variables getters and setters LoginDAO - concrete java class where I am running my SQL queries and doing rest of the logical work. Connection class - java class just to connect to the database view - jsp to display the results html - used for form Is this how you design a java program based on MVC design pattern? Please provide some suggestions?

    Read the article

  • Watch syntax help

    - by Jason
    In my Systems Programming class, there are weekly programming experiments, and I'm having trouble with the current one. The objective is to write a C program that slowly writes a string of text to a file, metered by usleep() in a 100 count for loop. The goal of the experiment is to observe the file size buffer in action via the watch command. However, I can't get it to work using watch -d ./output What syntax do I need for the watch command to see the changes made to the file size?

    Read the article

  • Help recovering broken OS (permissions issue)

    - by Guandalino
    (At the bottom there is an important update.) I was doing experiments in order to backup a remote account to my local system, Ubuntu 12.04 LTS. I'm not confident with duplicity and probably, due to wrong syntax, some local files have been replaced with remote files. This is just a supposition, I'm not sure this is the real cause of OS corruption. The corruption happened after experimenting with backups, so I think I did something wrong at this regard. I was aware there was a problem when I tried to access a command using sudo: $ sudo ls sudo: unable to open /etc/sudoers: Permission denied sudo: no valid sudoers sources found, quitting sudo: unable to initialize policy plugin This is how /etc/sudoers looks like: $ ls -ald /etc/sudoers -r--r----- 1 root root 788 Oct 2 18:30 /etc/sudoers At this point I tried to reboot and now this is the message I get: The system is running in low graphics mode. Your screen, graphics card and input device settings could not be detected correctly. You will need to configure these yourself. I tried to follow the wizard to configure these settings, but without luck (the system prevents me going on when I press "Next"). The thing that makes me a bit less worried is that all the data on the disk seems readable and I'm able to access them using a live cd. I run memtest and RAM seems to be OK. Do you have any idea about how to recover my system? I'm very glad to provide further information, just let me know what info could be helpful. UPDATE. The issue is about wrong permissions and this is how I discovered: I mounted the root partition of the broken OS on /mnt/broken/ (live CD) and did ls /mnt/broken/. I got a permission denied error, while I expected to have the directory listing. I had to do sudo ls /mnt/broken/ and this worked. Thus without having root permission via sudo it's impossible to access the root of broken os. The current output of ls -ld /mnt/broken/ is: drwxr-x--- 29 1000 812 4096 2012-12-08 21:58 /mnt/broken Any thoughts on how to restore the old (working) set of permissions?

    Read the article

  • Help with deleted components registry keys (2 replies)

    Hello, I did a big mistake and I deleted the path of these files in windows xp registry: System.Workflow.Activities.dll PresentationFramework.Luna.dll RedistList\\FrameworkList.xml The keys that should contain the paths are: [HKEY LOCAL MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S 1 5 18\Components\300DC0511590697408C9B53F71E7AB4A] &quot;0DC1503A46F231838AD88BCDDC8E8F7C&quot; &quot;&quot; [H...

    Read the article

  • htaccess 301 redirect help needed

    - by John
    Due to some issues in my site many pages are visible as duplicate using : www.example.com/page.html?task=view but it's content is exactly same as www.example.com/page.html. One way is to use http 301 redirect from www.example.com/page.html?task=view to www.example.com/page.html when anybody fetches page with arguments. But links like www.example.com/page.html?task=view will remain visible to outside world. Another way is canonicalization which I don't want to use as it is difficult to insert the tag in Joomla CMS. I want to hide www.example.com/page.html?task=view from external world. Is it possible to change the url from www.example.com/page.html?task=view to www.example.com/page.html ? I mean if there is href link of www.example.com/page.html?task=view in my web page, it should be visible to external world as without any arguments. This is different from using 301 to convert externally accessed page : www.example.com/page.html?task=view to without using arguments in .htaccess.

    Read the article

  • No internet - please help?

    - by All
    I just got Ubuntu and I am really really really a linux novice. I can't get the wireless to work? I played around with it until I saw it says "wireless firmware missing" - Hardware address 00:14:A5:6A:17:C2. On my laptop there is a button that looks like a little antenae that means the wireless is on. The funny thing is that this button does not seem to do anything right now - the light is not lit up and does not light up. Any thoughts you have on getting this going are appreciated!

    Read the article

  • How Do External Links Help SEO?

    Starting at the beginning because without search engines there would be no optimisation. Google was founded by two Stanford University students in 1996 as part of a doctoral research project by Larry Page and Sergey Brin.

    Read the article

  • How the Right SEO Expert Can Help You

    While there are many types of SEO experts available in the market to choose from, you have to remember that only the right ones are essentially what is needed to make sure your website does better that others. By now, you have already probably heard of searched genie optimization and what are the immense benefits that are associated with utilizing such service.

    Read the article

< Previous Page | 21 22 23 24 25 26 27 28 29 30 31 32  | Next Page >