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  • Optimum number of threads while multitasking

    - by Gun Deniz
    I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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  • How bad is it to have two methods with the same name but different signatures in two classes?

    - by Super User
    I have a design problem related to a public interface, the names of methods, and the understanding of my API and code. I have two classes like this: class A: ... function collision(self): .... ... class B: .... function _collision(self, another_object, l, r, t, b): .... The first class has one public method named collision, and the second has one private method called _collision. The two methods differs in argument type and number. As an example let's say that _collision checks if the object is colliding with another object with certain conditions l, r, t, b (collide on the left side, right side, etc) and returns true or false. The public collision method, on the other hand, resolves all the collisions of the object with other objects. The two methods have the same name because I think it's better to avoid overloading the design with different names for methods that do almost the same thing, but in distinct contexts and classes. Is this clear enough to the reader or I should change the method's name?

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  • I want to be a programmer, work in corporate environment, earn well, learn fast and eventually become a great programmer [on hold]

    - by Shin San
    I'll try to keep this simple: I'm 29, been dabbling with computers for the past 10 years, had entry level jobs in tech support for different apps, been fixing computers for a while and now want to specialize in something. I'm not 100% stranger to programming but haven't gone past if/then/else with anything. A bit of JavaScript, PHP, Python and currently checking out the "SELECT" statement in SQL :)) I'm curious about programming, I enjoy it and I'm thinking of making a living out of it. So, while I'm at it, why not earn a bit more than the average Joe? So, that's why I'm checking what the best solution, the best learning path and the most useful languages are considering: a) how easy/fast can you find a job by knowing it b) how much would I be able to earn c) how fast can I learn it By reading 10-20 articles online I've come up with an example, but I'm here for some expert advice. Example: * ratings from a) and b) point of view #1 sql ; #2 java ; #3 html (please don't start the markup language debate) ; #4 javascript From this ratings, I'd say a good way to go is learn html/css/(javascript or php) for the web part of apps, some SQL/MySQL/whateverSQL for holding data and loads of Java for the program itself. Please let me know if this is a good idea and if so, what should be the order for learning all of the above. Else, please let me know a better way and why it would be better. Many thanks for taking the time to read my question. Best wishes to you guys Edit: if I think Java + SQL + HTML&JavaScript is the way to go, does the order I'm learning them in matter? Or can I try to learn them all at once?

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  • good literature for teaching object oriented thinking in C [closed]

    - by Dipan Mehta
    Quite often C is the primary platform for the development. And when things are large scale, I have seen partitioning of the system as different objects is quite a natural thing. Some or many of the object orientated analysis and design principles are used here very well. This is not a debate question about whether or not C is a good candidate for object oriented programming or not. This is also NOT a question how to do OO in C. You can refer to this question and there are probably many such citations. As far as I am concerned, I have learned some of this things while working with many open source and commercial projects. (libjpeg, ffmpeg, Gstreamer which is based on GObject). I can probably extend a few references that explains some of these concepts such as - 1. Event Helix article, 2. Linux Mag article 3. one of my answers which links Schreiner's reference. Unfortunately, when we induct younger folks, it seems too hard to make them learn all of it the hard way. Usually, when we say it's C, a general reaction is to throw away all of the "Object thinking". Looking for help extending above references from those who have been in the similar areas of work. Are there any good formal literature that explains how Object thinking can be made to use while you are working in C? I have seen tons of book on general "object oriented paradigms" but they all focus on advanced languages mostly not in C. You see most C books - but most focus only on the syntax and the obfuscated corners of C and that's it. There are hardly ANY good reference, specially books or any systematic (I mean formal) literature on how to apply OO in C. This is very surprising given that so many large scale open source projects use C which are truly using this very well; but we hardly see any good formal literature on this subject.

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  • XNA for life!

    - by George Clingerman
    Or until my arm falls off at least…. I’ve been meaning to get a new tattoo for quite a while. And I wanted it to be geeky and to represent some memorable milestone in my life. So I was thinking, mulling over some various ideas, sketching some things out. And then it hit me. XNA. Specifically the XNA logo. It’s super geeky (so geeky I’ll probably have to explain to 90% of the people that say it what it even means) and I’m not sure that anything has been so memorable and made such a change in my life as XNA. Cheesy but true. When the XNA framework came out, thing started happening quickly. I stumbled into a geek community and started going to code camps, MSDN events, code-a-thons. I got an XNA MVP award. Met huge geek idols in my life (like Rory Blyth and Scott Hanselman) and just really started getting integrated into this fantastic development community. Then to add to all of that I became part of this fantastic XNA community. It’s really just been one of the best things to ever happen to me and I’m having the time of my life right now. So sure, it’s permanent. Sure Microsoft could cancel XNA, rebrand it to Flimmer Flammer or some other name. Sure my arms are going to be wrinkly and flabby when I’m older and for sure I’m going to have to explain to people over and over again just what in the world “xna” means. But you know what, every time I look at that tattoo and every time I’m telling somebody what xna means, I’m going to remember all these awesome things that have happened to me. All the tremendous things I’m seeing people do with the XNA framework and more importantly all the stories and friendships I’ve formed in the XNA community. And I think that deserves a little permanent recognition.

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  • How can I use an SSH tunnel for all traffic from a single application, without knowing the ports used?

    - by Matthew Read
    I have an application that opens connections on dozens of ports, and doesn't provide documentation about which ports it uses. I could use Wireshark or something to capture the traffic and export the ports from that, but I think it should be simpler than that. (And I'm not sure I would be able to cover all use cases and ensure the app used every single port it can ever use.) So I'm looking for a way to just say "forward all traffic from this application" (bonus points for all traffic from child processes as well) without needing to worry about specific ports. I'm sure there must be a way, but I couldn't hit on the right keywords while searching Google. How can I do this?

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  • How do I make money from my FOSS while staying anonymous?

    - by user21007
    Let's say that: You have created a FOSS project that other people find useful, perhaps useful enough to donate to or pay for modifications to be done. It is a perfectly legitimate and innocuous software project. It has nothing to do with cryptography as munitions, p2p music, or anything likely to lead to a search warrant or being sued. You want your involvement to stay anonymous or pseudonymous. You would like to receive some money for your efforts, if people are willing. Is that possible, and if so, how could it be done? When I talk about anonymity, I realize that it is necessary to define the extent. I am not talking about Wikileaks style 20 layers of proxies worth of anonymity. I would expect a 3 letter agency to be able to identify the person easily. What is wanted is shielding from commercial competitors or random people, who would not be expected to be able to get the financial intermediary to divulge your details just by asking for them. Why would you want to stay anonymous? I can think of several valid reasons, maybe you operate a stealth mode startup and don't want to give your competitors clues as to the technology you are using. Maybe it is a project that has nothing to do with your daily job, is not developed there, but the company you work for has an unfair (and possibly unenforceable) policy stating that any coding you do is owned by them. Maybe you just value your privacy. For what it's worth, you intend to pay the relevant taxes in your country on any donations.

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  • Large enterprise application - clients wish to use duplicate e-mails addresses?

    - by Alex Key
    I'd like to know people's opinions, reactions to clients and technical work arounds (if applicable), to the issue of an enterprise application where a client wishes to use duplicate e-mail addresses? To clarify, when I say duplicate e-mail addresses I mean within the same client system, having multiple users that have the same e-mail address. So not just using generic e-mail addresses but using the e-mail address of another user. e.g. Bob Jenkins: [email protected] James Jeffery: [email protected] Context To give this some further context, in the e-learning sector it is common that although all staff in an organisation must complete e-learning - they may not have their own e-mail address so they choose to use their managers e-mail address. Albeit against good practice in public sites... it's a requirement we've over and over again where an organisation is split between office based staff and perhaps e.g. staff in a warehouse. Where problem lies Mr Steak, good point, the problem lies in password resets and perhaps in situations where semi-personal information could be sent (not confidential enough to worry about the insecurities of email). Perhaps reminders for specific system actions, which would be confusing for the unintended party to see (if perhaps misreading the e-mail's intended recipient) Possible solutions System knowing the difference between a "for the attention of" and direct to the person e-mails, including this in the body text. Using alternative communication such as SMS Simply not having e-mails sent to people who are not the intended recipient. Providing an e-mail service ourselfs (not really viable for a corporate IT dept) Thoughts?

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  • Should components have sub-components in a component-based system like Artemis?

    - by Daniel Ingraham
    I am designing a game using Artemis, although this is more of philosophical question about component-based design in general. Let's say I have non-primitive data which applies to a given component (a Component "animal" may have qualities such as "teeth" or "diet"). There are three ways to approach this in data-driven design, as I see it: 1) Generate classes for these qualities using "traditional" OOP. I imagine this has negative implications for performance, as systems then must be made aware of these qualities in order to process them. It also seems counter to the overall philosophy of data-driven design. 2) Include these qualities as sub-components. This seems off, in that we are now confusing the role of components with that of entities. Moreover out of the box Artemis isn't capable of mapping these subcomponents onto their parent components. 3) Add "teeth", "diet", etc. as components to the overall entity alongside "animal". While this feels odd hierarchically, it may simply be a peculiarity of component-based systems. I suspect 3 is the correct way to think about things, but I was curious about other ideas.

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  • Can a power failure or forceful shutdown damage hardware?

    - by Vilx-
    Can computer hardware suffer damage from forceful shutdowns (holding the power button for five (5) seconds) or power failures? I believe that normal PC hardware does not suffer from this - after all, it's not much different than what they experience under a standard shutdown. But elsewhere I've read tht another person thought that it could do physical harm to the hard drive and possibly other components as well. He also said that the journaling features of filesystems are useless in face of power failures and were intended to help mitigate damage from system crashes. I think this is nonsense, but then again I lack the experience and knowledge to say it with certainty.

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  • Leveraging Code Across Platforms in Ever Bigger Games

    - by ashes999
    Summary: The same way that I continually build complex engines and libraries within a single platform and technology to allow me to build increasingly bigger and better games, how to continue this when development crosses into different platforms? If I switch platforms, how do I leverage past code and experiences? Games are hard to build. Big games are even harder to build. I've decided that to be able to make big games, I need to start building smaller games, and building up an asset base of code, assets (graphics, sounds), tools, and most importantly, game engines, so that I can eventually get there. One game at a time. Let me give an analogy. To build an MMO 3D RPG, I would approach this by building and releasing small games with increasingly more features. This could entail, for example: A simple 2D game A tile-based game A game with RPG elements (items, equipment, monsters, battle) A full-fledged RPG A 3D RPG The problem now is if I have to change platforms or tools, I don't know how to leverage past code-bases (and experience) to start with a mature product. Right now, I'm writing Silverlight (FlatRedBall) games. Let's say I stick with this for ten years, and then suddenly decide to write a PS6 game, which is in a different programming language entirely. Granted, I have ten years of game-development experience (and correspondingly ten years of professional software development experience from my day job) to back me up. But I would still like some way to transplant that 2D RPG engine into the new programming language, or else leverage it somehow. Is this even possible? What are my options?

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  • Best filesystem for an external drive? ExFAT?

    - by GiH
    What is the best filesystem for use with multiple OS's? I saw this question but its old and doesn't take into account ExFAT. Here is what I know from my findings: NTFS - Can't write from Mac FAT32 - Doesn't support files larger than 4GB HFS - Only mac ExFAT - ??? I don't know much about this but it seems like it got rid of the 4GB limit of FAT32 and can be read on Windows, Mac, and Linux. Is ExFAT the best bet? I tried formatting the drive in ExFAT just now, but on Windows XP SP3 it was showing up as not formatted... It seems to me like FAT32 is still the best, but I wanted to see what other people had to say.

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  • How to avoid printing nearly blank pages?

    - by joelarson
    How many times have you printed an email just to have the last page be 2 or 3 lines of a person's signature (or worse, the "This is confidential" copy inserted by corporate mailservers)? How many times has the last page contained just the footer of the website? Does anyone know of a utility or print driver that can help avoid printing blank or nearly-blank pages? I am not looking for techniques for avoiding this in specific programs -- if I take the effort of doing print preview and then adjusting the pages to be printed, then of course I can avoid it. What I want something I can install that, whenever I push "Print" to any of the various printers I print to with my laptop, it automatically says "hmmm... I bet he doesn't really want that page which is 95% empty" and possibly prompts me to say "do you really want to waste paper on this?"

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  • File replication among EC2 instances

    - by Peuge
    I am pretty new to AWS so please excuse my ignorance. We are wanting to have a setup whereby we have a SQL DB instance + web server instance. However we would like the Web server to sit behind an ELB thus allowing us to use Autoscaling. My question however is how to we replicate the web app across instances? Say for example we have two web servers running and we need to make a critical update to the web app, ultimately we would only want to upload to one instance and not both. Is it even best practice to store your web app on the instance or are there better ways to store and share the app between instances?

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  • IE and Chrome won't browse the internet on dial up but firefox will. How could I fix it?

    - by Kelbizzle
    First let me say I've done plenty of troubleshooting and will try to explain as clearly and as much as I can. Please bear with me. I have a client's computer who uses dial-up and Windows XP. The problem is when I connect to the dial up ISP. IE or Chrome will not browse the internet. It says page cannot be displayed. but if I use firefox on the dialup connection it works. Sounds simple enough there has got to be something wrong with the proxy settings or something...well, that's what I thought here is the weird part. When connected to the LAN in my office IE, Chrome, and FF all work. I upgraded to ie8 and the issue still happens. How would you go about troubleshooting this issue? What should I do next?

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  • trying to understand how Linux /etc/hosts file works with local and external IP addresses

    - by gkdsp
    Let's say I have a Linux server with an external IP of 123.456.789.012 and a local IP of 192.168.0.1. If it's /etc/hosts file looks like, for example, 123.456.789.012 host2.mydomain.com 192.168.0.1 host2.mydomain.com When an application on the server generates traffic to send using host2.mydomain.com, how does the server know whether to use the local or external IP address (since the same host name shows two IP addresses)? Or, does it need something additional than what I've presented here to decide this? Or, does it just sent it out as host2.mydomain.com and let the receiving end deal with it (if so, how to make sure traffic intended for local network indeed goes to local network)?

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  • Rules to choose hardware for OLTP systems (sql server)

    - by Roman Pokrovskij
    Ok. We know database size, number of concurrent users, number of transactions per minute; should choose number of processors, RAID, RAM, mirroring and clustering. There are no exact rule.. but may be there are no rules at all? In my practice in every case I have "legacy" system, and after some inspections and interview I can form an opinion how hardware and design can be improved. But every time when I meet "absolutely" new system (I guess there are no new systems, but sometimes are such tasks) I can't say anything trustful. So I'm interesting how people deal with such tasks? They map task on theirs experience or have some base formulas?

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  • Publishing and setting permissions to a Linux share to AD

    - by blsub6
    I have a Linux share that I want to publish to users on my Active Directory domain. I'd like to be able to control the permissions to access that share using security groups. So say I have a share named "Share" on my Linux machine named "Linux" with IP address 192.168.1.2. I publish \\192.168.1.2\Share in AD and make it so that only people who are part of the "IT" security group can access it. What's to stop anyone who's not in the "IT" security group from just going to explorer and typing in \\192.168.1.2\Share or \\Linux\Share into their Explorer to access this share? Do I need to set up permissions on the Linux file server?

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  • Installing 2 DDR3 Sticks in MB with 4 Slots

    - by The Sasquatch
    Hey everyone, I just put together my first system that uses DDR3 memory. The motherboard I got is an ASUS M4A77T/USB3 and it has 4 DDR3 RAM slots. Looking in the manual for the MB it doesn't say anything about how to install the RAM as far as matching the pairs goes. I have 2 4GB sticks of RAM, and whether I put the sticks next to each other (of the 4 RAM slots, there are two blue ones next to each other and 2 black ones next to each other) or space them apart, The BIOS still shows that I have 8GB installed. I have been getting an IRQL_NOT_LESS_OR_EQUAL BSOD error, and have read in some other places that it could be hardware/RAM related. Does the RAM need to go in the A1, A2 slots (different colored but both A), or the A1 B1 slots? (A1 B1 are both the lovely blue color.) Any help would be awesome. THANKS!

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  • Provision storage in SAN encironment

    - by wildchild
    hi,.. Can somebody help in understanding how Lun Provisioning is done in clariion based on client requirement. Say, a client needs one 50 GB space on the host( for application) ,two -350 GBs ( for DB and stuff) on the same host and i have 4 raid groups with space of 200 GB in one 50 GB in second and 400 GB and 400GB in rest two all having 5 disks. And , I 'm using Raid 5 only. How do i provision keeping performance in mind( so that performance hit is not there)?..And i need to understand the concept of meta head as well. Please help me by elaborating the above scenario..I am learning to provision storage in non productive environment( b'fore going ahead and working on client prod server) and i have been learning a lot from SF ...I request the seniors here to help me understand it better. Thanks for reading

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  • Corrupt Windows 7, Chkdsk finds errors continuously after multiple tries

    - by mj_
    My Windows 7 instance is all corrupt on my Dell XPS laptop (my kid hibernated it as it was starting). I got the Windows 7 installation disc and I try to repair the installation. The repair goes through and it says done but it doesn't know if it repaired successfully. It just says reboot. I can also open a command line and I run chkdsk /F manually in there. What's strange is that I've run it 20 times and chkdsk claims that it fixes stuff every time. Eventually it stops and I reboot. Much to my chagrin, my machine is still broken. Chkdsk gives an error at the end that it can't write a log file. I've also run a full diagnostic using the Dell diagnostic tools. The tools say that everything is okay. Any suggestions regarding what I should do next? Any help appreciated. mj

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  • IP assignment in a /28 block

    - by mks
    Need help on setting up firewall router. My config is as below: Public static network ID: x.x.x.48/28 gateway: x.x.x.49 available IP for the hosts: x.x.x.52 to 62 gw_eth0 <-- fw_eth0 - fw_eth1 <-- dmz_switch Four servers are connected on dmz_switch (say s1, s2, s3, s4) all have to use public static IP address from the above block. Any recommendation on IP assignment and route setup? Do I need to subnet the above block further or simply use /32 netmask and point-to-point static routes in the above setup?

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  • Configuring BIND to use VM's DNS for specific domain

    - by Srirangan
    I work on a project for which I use an Ubuntu server vm on an Ubuntu host. The VM runs all the services / webapps through haproxy and nginx and serves it on the domain (xyz.com). I manually modify my resolv.conf to use the VMs IP address as the nameserver and I can run my app on the host browser. The problem is I am modifying an auto-generated file (resolv.conf) and I need to do it each time. Is there a smart way to say: -- are you accessing xyz.com? -- if yes use VM's DNS server, else use the hosts

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  • How to install nvidia drivers (GT 440 ) on Xubuntu 12.10 , screen res gone to 640x480 :(

    - by shaggyjack
    Hi all after days of endless googling I finally gave in and decided to try and directly ask for help. I have just installed Xubuntu and updated to 12.10 on a pretty old (12 years) machine, and I am now struggling to install the correct drivers for the nvidia 440 gt card.. I have managed to get "additional drivers" but the app does not show in the menu, I went through a few procedures which ended up in my screen going no higher than 640x480, and tried all the sudo apt-get variations with nvidia-current and current updates... I think I got the right version of the drivers ( 93.43.07 ) but they won't install from terminal as they say I am running an X server. So I learnt how to shut the graphic interface but then I try and install them from there but after I write the exact same command (sudo home/username/Downloads/NVIDIA-Linux-x86-96.43.07.pkg1.run ) nothing happens and the terminal says something like command not found. I am desperate for help if anybody could point me in the right direction that would be greatly appreciated. There are lots of similar topics on installing nvidia drivers but I seem to understand that current drivers are no good for my old GPU. So if anybody could show me how to install the right version that would be excellent. Thanks in advance! Jack

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  • Time difference between servers after disaster recovery

    - by Sandokan
    We are running an old training system based on Windows Server 2003 and XP-clients. The solution is rather simple with four servers, two of them beeing DC:s. Everything is preconfigured and that goes for backup scheme as well. The backup software is Symantec BackupExec 2010. The scheme is a standard GF-F-S routine with full backups running once a week on Sundays. The other six days run differential backups. Now let's say in a worst case scenario, a server crashes on Saturday and we have to restore it from backup. The last backup will then be six days old and thus it will come online with six days old configurations. Will this pose a problem for the other servers or will the recovered server "get in line" eventually?

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