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• How do I transition from physics and math to programming?

  - by inovaovao

  I'm a physics PhD with little actual programming experience. I've always liked programming and played around with BASIC, Pascal as a teen, but the extent of my experience writing complex programs comes from an introductory course in computer science. Now I've decided that I'm more interested in programming than in physics and started to learn Java. Coming from a physics or math-heavy background, what would be the best strategy to maximize my value in the field?

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• Entire filesystem restore from rdiff-backup snapshot

  - by atmosx

  I'm trying to make a complete system restore from an rdiff-backup. The cli for backing was: rdiff-backup --exclude-special-files --exclude /tmp --exclude /mnt --exclude /proc --exclude /sys / /mnt/backup/ebox/ I created a new partition mounted the partition at /mnt/gentoo and did: rdiff-backup -r /mnt/vol2 /mnt/gentoo However when I try to chroot to this system (following gentoo's manual, which means mounting /dev/ and /proc) I get the following error: chroot: failed to run command/bin/bash': No such file or directory` All this takes place on a Parallels (virtual machine) Debian installation. Any ideas on how to proceed in order to fully restore the system? Best Regards ps. /mnt/gentoo/bin/bash works fine if I execute it. All files and permissions are in place rdiff-backup seems to work just fine. However the system cannot neither boot (exits with kernel panic - cannot find init) or be chrooted.

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• Is (Ubuntu) Linux file copying algorithm better than Windows 7?

  - by Sarath

  Windows Copying is a real mess ever since Windows Vista. Even Microsoft claims they've improved the performance, from a user perspective, it's not quite visible. Even with single file the copying window appears too much time for 'Calculating' and then finishing the copy(Even after 100% completion some times the dialog remains active). At the same time, I was backing up some files in Ubuntu Linux. I felt it's really fast. Might be a feeling caused by faster UI updates. I read an informative post from Jeff Atwood few years back on Windows File Copying. but what my specific questions are Is (Ubuntu) Linux file performance is better than Windows-7? Are both algorithms, Windows and Linux is making use of multiple threads and pipelining mechanism to improve the speed? If yes, which one is better?

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• Awesome SEO Tips

  To survive in the competitive e-marketing world almost every small e-commerce business is implementing Search Engine Optimization technique. From the pile of SEO tips as well as strategies selecting the best strategy is pretty tough. You must have basic knowledge of SEO and what is the latest update on this field. Here are some of the most praiseworthy and efficient SEO tips framed for you.

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• Grub problem - Command prompt

  - by RhZ

  Update: Thanks to all who helped. I gave up and am going to re-install. Not the end of the world, no files will be lost :-) This time will be backing up grub haha. Thanks again, I really appreciate the community's help on this. I was going along fine when the new pae kernel came down, and it had some bug where the sound was all messed up. So I used startup manager to choose the older pae kernel and rebooted. But startupmanager must have fuXXored my grub. When I re-booted, I get thrown directly into memtest and thats it. I tried to re-install grub using the live disc method that I found in many places. That changed something so I get a prompt and the message: "GNU grub version 1.99 ubuntu. Minimal BASH-like editing is supported. Type help for complete list." But then I tried the live CD fix again and now am back at the memtest... What can I do to get my system running again? UPDATE: Just to be clear,when I start up I get a blinking cursor in the top left, and the word 'ON' in the middle of the screen. Then, after a good minute or two, the memtest starts.

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• Why Choose Article Writing and Submission Service?

  As a website owner, are you looking for ways to benefit from One Way Links? Do you want to enjoy high traffic, high PR ranking, more hits and more sales? All this is possible through SEO services. There are many techniques offered by the experts in the field.

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• backuppc - how to backup remote (over the internet) clients?

  - by Scott

  I am testing out backuppc, which works great so far backing up windows clients on a LAN via SMB (no backup client/agent required). However I have quite a few laptops and desktops that are in various remote locations - some of which move around. I need some way to have that remote computer create an outgoing connection for backup purposes (Windows XP/7). I know backuppc supports smb, rsync and 'tar', but I believe these are all connections going from the server TO the client. SO, I either need a way to vpn the client on a timed basis, or it would be a lot better if the client could some how connect to the server (ssh?) and initiate it's own backup somehow (rsync?). Of course this all needs to be pre-installed by me and require no maintenance by the end user, no dialogs on their side. What do you think?

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• Of what significance is the solution to the game of checkers in AI research?

  - by cobie

  I have been doing some research into artificial intelligence and I came across a 2007 paper titled "Checkers is Solved" on the game of checkers being solved by AI techniques after more than 16 years of trial. A solution to the game is defined by the team as "determining the final result in a game with no mistakes made by either player". The search for a solution started back in 1989 and it was finally found in 2007. Of what importance is this to the field of AI?

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• Using Windows Azure storage for backup

  - by Bruno

  I am currently looking at Windows Azure blobs as an option for backing up archive data. I want to be able to upload files from an external windows machine via the internet but I don't know enough about Windows Azure storage to make a decision. Some of the questions I have are How do I upload the files. Is there a client application, can I use robocopy? Would it be fast enough? i.e. Could I download or upload 1TB of data in a week? Is it secure? Hopefully someone smarter than me can help me :-)

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• contractor vs full time employee

  - by Victor

  What is the long term career prospect of a contractor/consultant in IT field vs a full time salaried employee? The usual arguments aside: Stability vs more upfront money;paid leaves vs tax savings;less paperwork vs more freedom;stagnation vs changing job environments etc etc etc Can some one with a long career experience in hopefully both sides of the divide comment on the pros and cons of contracting vs being an employee? This will be beneficial for all if only people with ample experience choose to answer. Comments are always welcome though.

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• Best network tuning variables for a Linux proxy

  - by smarthall

  What are the best settings to tune so that Linux can handle a very large amount of TCP connections such as would be seen by a proxy server or a webserver? I'm using Centos6 and squid and am seeing a large amount of TIME_WAIT connections backing up until finally the machine stops responding. The machine isn't loaded at the time, and is having trouble making ingoing and outgoing connections. I've had several suggestions of tuning /proc/sys/net/ipv4/tcp_tw_reuse and /proc/sys/net/ipv4/tcp_tw_reuse but they mention bad interactions with load balancers and NAT both of which are used in my situation.

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• Why is Ubuntu unmounting my primary hard drive?

  - by Twisol

  I'm running Ubuntu 10.10 on my laptop (an Asus G73j), dual-booting Windows 7 if that matters. After using the computer for couple of hours or so, I get a popup complaining that a file was unmounted, then my GNOME desktop panels disappear. I can't save any unsaved work (the file browser shows "Filesystem" as totally empty), and other programs break in odd ways (like Chrome can't browse to any new pages, but keeps current ones going... at least I still have Pandora to listen to when this happens!). I've tried looking in the system logs to no avail; I'm assuming that it can't write any errors to the logs because, of course, the logs are on the primary hard drives. This started happening maybe a few days ago. Yesterday I upgraded from 10.4, but I believe it was happening before then. Any advice for figuring this out? EDIT: It just happened again, and I heard a small little clicky sound from the hard drive about five seconds before things went south. I'm thinking I should start backing up ASAP. In response to a comment, here's the dmesg output: http://askubuntu.pastebin.com/uYGshBay Also, the SMART status says the disk has a few bad sectors, and the detailed data says there are 14. It says it passed the self-assessment though. Lastly, this doesn't seem to be happening when I'm on Windows. I recently re-enabled ureadahead (which I disabled ages ago because it was causing Ubuntu to hang at the startup logo), could that be the source of the problem? I've disabled it again to see.

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• Windows Web Hosting: Why Go There?

  I work in the IT field over the last six years. I';ve always been confused about web hosting, especially on the types of hosting. This always used to confuse me, what is the best Linux or Windows? M... [Author: Danny Higson - Web Design and Development - June 09, 2010]

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• What legal considerations do I need to have when programming?

  - by JustJohn

  Recently I worked with a group to create a logging system for tutoring labs to track Tutor hours, and usage of the labs. We had to change the design a fair amount to be in compliance with FERPA. My question stems from the curiosity that in my course of study there has never been a real mention of how people in this field have to deal with complying with the law in their work. So I would like to know how much programmers have to consider the law in the work they do.

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• Impact of Server Failure on Coherence Request Processing

  - by jpurdy

  Requests against a given cache server may be temporarily blocked for several seconds following the failure of other cluster members. This may cause issues for applications that can not tolerate multi-second response times even during failover processing (ignoring for the moment that in practice there are a variety of issues that make such absolute guarantees challenging even when there are no server failures). In general, Coherence is designed around the principle that failures in one member should not affect the rest of the cluster if at all possible. However, it's obvious that if that failed member was managing a piece of state that another member depends on, the second member will need to wait until a new member assumes responsibility for managing that state. This transfer of responsibility is (as of Coherence 3.7) performed by the primary service thread for each cache service. The finest possible granularity for transferring responsibility is a single partition. So the question becomes how to minimize the time spent processing each partition. Here are some optimizations that may reduce this period: Reduce the size of each partition (by increasing the partition count) Increase the number of JVMs across the cluster (increasing the total number of primary service threads) Increase the number of CPUs across the cluster (making sure that each JVM has a CPU core when needed) Re-evaluate the set of configured indexes (as these will need to be rebuilt when a partition moves) Make sure that the backing map is as fast as possible (in most cases this means running on-heap) Make sure that the cluster is running on hardware with fast CPU cores (since the partition processing is single-threaded) As always, proper testing is required to make sure that configuration changes have the desired effect (and also to quantify that effect).

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• how to include tags in permalinks of wordpress

  - by babua

  while using custom structure in my wordpress url , when i am trying to include tags, it shows me , it is showing errors , but when i add category , it reflects in url. i want that the tag gets included in custom url structure automatically , how can it be done using wordpress ... please help ... when i am adding /%tag%/ to custom structure field in wordpress admin , the url shows not found message.

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• Is there a way to schedule an automatic WinClone run on my Bootcamp partition?

  - by user17873

  Hi, I've currently got time machine setup to back up my entire OS X installation. I also have a backup tool within my Bootcamp Windows 7 installation which automatically backs up my windows profile data to an external drive partition. Finally, I'm also backing up my Bootcamp partition weekly and storing on an external drive using WinClone. The final piece I need to complete my external backup process is to have the WinClone application backup my Bootcamp partition automatically once a week rather than having to call it manually and remember. Is this possible?

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• SEO - That's All You Ever Think About

  What's your domain name? How old is it? How relevant is it to your business and does it contain relevant keywords? SEO related keywords or keyword phrases perhaps that relate directly to your field of business?

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• What's the best tool to use to automatically backup selected folders from Windows to my external hard drive?

  - by PhD

  I have a 1TB external hard drive and I'd like to periodically schedule backups of my "Libraries" in Windows to the external drive. I'd prefer if it could detect what files have changed and periodically transfer them to the drive instead of I having to do it manually. Is there a way in Windows 7 to do this automatically? If not, what are some external tools (preferably free) that I can use for this? EDIT: I've used Windows back-up and I find it restrictive for detecting changes and backing up automatically. That's all that I'm aware of. My WD hard drive had something for this but the application doesn't work any more and it wasn't that good either. So, I wish to know what are my options.

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• ToolTip flicker in Java if outside JFrame? [closed]

  - by Skarion

  Hi! I am implementing ToolTip in Java as to make users having an easier time to use the product. Though tooltip that are at the borders of the JFrame and ends up outside the JFrame starts to "flicker". I've tried lots of things (like moving the tooltip so it should be inside the Jframe, controlling the painting so it ends up within the JFrame and so on) though it doesn't work. Anyone got any expertise within the field that know how to avoid this problem? Cheers, Skarion

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• not able to login in ubuntu box with root password

  - by pankaj sharma

  i have ubuntu 10.04 on my sytem, i run command apt-get install csh on the system and try to change the shell by command chsh -s but now the prob is when i try to login the system by ssh i am not able to login by any user account except one and try to change the user su - root it is showing cannot execute c: no such file or directory and look in the /etc/passwd file for root account in shell field C is written in place of /bin/sh help me out to restore the settings

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• Top Three Advantages of Using Link Building Services

  Link building services are an integral part of internet marketing strategies for any website. It is one of the top methods of directing quality web traffic. It can be done by anyone who knows anything about internet marketing however experts in the field are able to optimize the process which gives the best results in the shortest amount of time.

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• Paypal "Subscribe" button: Is it possible to let the subscriber set the amount?

  - by Šime Vidas

  I'm setting up a recurring payment option on my website. I'd like to have two options: Option 1 (for individuals): Fixed $6/mo subscription Option 2 (for organizations): A subscription where the amount is set by the subscriber PayPal's "Subscribe" button does not seem to allow that: When I leave the "Amount" field of the 2nd option empty, I get an error: So, is this not possible? Do all options require fixed amounts?

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• Process that needs a volume starting before volume mounts

  - by user36126

  The destination for incoming CrashPlan backups on my server (11.04) is /media/SeagateBig (SeagateBig is the volume name of my 2TB USB drive). When the server boots, two things happen: 1) SeagateBig auto-mounts and 2) CrashPlan starts. The problem is, that often these two things don't happen in that order. Then I get: Crashplan starts looks for /media/SeagateBig doesn't find it instead of waiting for it, CREATES IT Now it's backing up onto my / filesystem. NOT COOL. Meanwhile, when SeagateBig finally gets around to mounting, it finds that /media/SeagateBig already exists, shrugs, and creates /media/SeagateBig_ as its mount point. What I need is a way for the order to be enforced - where SeagateBig mounts and then and only then the CrashPlan service is started. Unless I learn that CrashPlan can be told to wait for its destination directory, never to create it... which I am also investigating. But the CrashPlanEngine script is installed by the product so I am loath to modify it, as I know I could by having it loop until df greps successfully for "SeagateBig".

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• reference list for non-IT driven algorithmic patterns

  - by Quicker

  I am looking for a reference list for non-IT driven algorithmic patterns (which still can be helped with IT implementations of IT). An Example List would be: name; short desc; reference Travelling Salesman; find the shortest possible route on a multiple target path; http://en.wikipedia.org/wiki/Travelling_salesman_problem Ressource Disposition (aka Regulation); Distribute a limited/exceeding input on a given number output receivers based on distribution rules; http://database-programmer.blogspot.de/2010/12/critical-analysis-of-algorithm-sproc.html If there is no such list, but you instantly think of something specific, please 'put it on the desk'. Maybe I can compile something out of the input I get here (actually I am very frustrated as I did not find any such list via research by myself). Details on Scoping: I found it very hard to formulate what I want in a way everything is out that I do not need (which may be the issue why I did not find anything at google). There is a database centric definition for what I am looking for in the section 'Processes' of the second example link. That somehow fits, but the database focus sort of drifts away from the pattern thinking, which I have in mind. So here are my own thoughts around what's in and what's out: I am NOT looking for a foundational algo ref list, which is implemented as basis for any programming language. Eg. the php reference describes substr and strlen. That implements algos, but is not what I am looking for. the problem the algo does address would even exist, if there were no computers (or other IT components) the main focus of the algo is NOT to help other algo's chances are high, that there are implementions of the solution or any workaround without any IT support out there in the world however the algo could be benefitialy implemented/fully supported by a software application = means: the problem of the algo has to be addressed anyway, but running an algo implementation with software automates the process (that is why I posted it on stackoverflow and not somewhere else) typically such algo implementations have more than one input field value and more than one output field value - which implies it could not be implemented as simple function (which is fixed to produce not more than one output value) in a normalized data model often times such algo implementation outputs span accross multiple rows (sometimes multiple tables), whereby the number of output rows depends on the input paraters and rows in the table(s) at start time - which implies that any algo implementation/procedure must interact with a database (read and/or write) I am mainly looking for patterns, not for specific implementations. Example: The Travelling Salesman assumes any coordinates, however it does not say: You need a table targets with fields x and y. - however sometimes descriptions are focussed on examples with specific implementations very much - no worries, as long as the pattern gets clear

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