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  • Why is my rsync so slow compared to pure cp or even scp?

    - by nfm
    I'm transfering the files from Linux to Windows 7 via a mounted share (the share is mounted from Windows on Linux).. I'm copying lots of data (i.e. nearly a TB) from the old to the new machine within my LAN. I'm unfortunate enough already that I only have 100MBit. Naturally I blindly used rsync but already wondered after a day why it feels so slow. Enabling the progress meter showed my a transfer rate of about 2MBit/s . So I took a reasonable big file (800MB) and tracked the transfer timing: cp : 05:33 scp (*): 06:33 rsync : 21:51 *) scp via localhost to the same Linux machine directly onto the share; completely useless but provided a progress meter The tests were as simple as (cp|scp|rsync) <source> <destination> No special arguments except host/port for scp. I even tried the -W switch for rsync but cancelled after ten minutes. rsync is 3.0.3 running on Lenny. To be able to interrupt the copy process anytime and resume lead me to rsync, but now I think I seriously need to reconsider this requirement. How's such a big difference possible?

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  • Slow upload, fast download on Windows 7 64bit system

    - by Malik
    I've got a weird problem in the download speeds on my desktop PC (Windows 7 Home Premium 64bit) are consistently fast (approx. 400kB/s) but uploads are very slow (around 6-10kB/s). This has been going on for the last 3 weeks or so. I am a very competent user and troubleshooter, and have searched online for 2 weeks for a solution, to no avail. Part of the problem is that internet is provided by WiFi by my landlord and I have no access to the router (BT Home Hub router) although I know for sure he wouldn't have the first idea on how to restrict my usage :) (rules that out) Anyway, I've tried: - various drivers (my Wifi 'card' is TP-link TL-WN851N, and I've tried TP-link + Atheros + Qualcomm Atheross drivers, suggested by Microsoft) - various tweaks to network parameters (e.g. as suggested by SpeedOptimser) - various tweaks to Windows 7 services (e.g. disabling/manual-ing unecessary services) - raising and lowering head onto a reasonably firm surface at moderate frequency (jk :D) None of the above have helped, and I'm officialy asking for help now!! Thanks for your time and effort in advance!

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  • What is the fastest RAID in practise?

    - by Luke
    I'm going to be rebuilding my server, and I want much faster access to my data. I've used RAID 1 and 0 in the past, and decided upon RAID 10 (dedicated RAID card). Then someone told me to use RAID 5+0, then someone else told me to use RAID 6+0. Assuming the Hardware RAID Card supports each level, what is currently the FASTEST RAID available, given x number of hard drives? Reliability is now another factor, and I am willing to spend money on new drives if a drive (or multiple) fail. I simply want to know what the fastest RAID level is, along with some reliability for recovering from a failure

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  • Auditing bandwidth of remote sites

    - by keithosu
    I would like to do an automatic audit of bandwidth of my remote offices. I understand that there are many websites where I could ask each user to go to a webpage and run the test. I was hoping there was some software that I could run on our web server and a script that I could send out that would run the test and record the results to a central web interface. The remote sites are all running some form of Windows and the server environment can be Linux or Windows based.

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  • VOIP and internet connection speeds [cable vs. fiber]

    - by microchasm
    Our office is migrating to IP telephony. We have less than 10 employees that will be using the phones. We currently have cable internet, and they just bumped the speeds: There is a data center that was just recently built in our building, and we were considering co-lo'ing there in the near future. As a result, they offered us access to their triple-redundant internet, but it's quite expensive. They are offering 3mbps committed with up to 10mbps burst for $250/month (discounted). We pay ~$120 for our cable (which the plan was to keep--at least for TV). I want the phone system and LAN to be as separate as possible. Was thinking about keeping the cable for LAN, and using the other connection for the phones (until I saw the price). Now I'm thinking it might make sense to add on to our existing cable setup, and change our phone to only have DSL as a backup for the cable. Is there any real benefit to the fiber? Especially for the price? Any other suggestions or ideas? Thanks.

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  • Which has a faster data transfer rate? WIFI (tablet or cell phone, not LTE) or MicroSD (Class 10)?

    - by techaddict
    Which of the two methods of dta transfer trasfers data at a faster rate for smartphones and tablets? Standard WIFI, or MicroSD Cards? I wonder if it would be actually faster to access data on external storage then it would be to have the MicroSD card in my smartphone or tablet. Currently I have a class 10 32GB MicroSD card in my cell phone. I am looking to get the new Google Nexus tablet but it does not offer expandable internal storage. I wonder if that's really a detriment; because if WIFI is faster than MicroSD, then it would matter almost none at all that you couldn't expand the storage internally. If the case is that WIFI is faster, and people caught onto this, then people could save a lot of money on lower memory ipads/iphones/ipods, tablets, and smartphones!

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  • Make the recycle bin of the SSD on a RAID0 drive?

    - by Rolnik
    I don't know about you folks, but I hate the idea of junk sitting on my tiny 30GB SSD. Any way to designate another drive to be the host of the Recycle Bin for items formerly on the SSD? Basically, I need to know how to make a lower-priority drive receive the recycled materials from the 'main' drive, which happens to be short on space. The best thing I can think of is a batch file that a) syncs 'recycle' to another drive; and b) empties the recycle bin. ... but that's too much work for me.

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  • router with mixed-mode enabled - does it really cripple speeds for all?

    - by Mark C
    Hey all, If I have a router that has "mixed mode" enabled to allow b, g, and n devices, it is true that n devices will suffer in reduced bandwidth if there are any non-n devices connected? I found one article on the internet after a quick google search: http://www.wi-fiplanet.com/news/article.php/3335801 Can anyone corroborate or give their opinion on the matter? Thanks!

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  • Sharing files between multiple computers?

    - by Koalatea
    At my school, we have 13 iMacs that we use to make our yearbook. Currently our school has some servers for us, but since we work with so many files ( thousands of pictures, most of which are ~3MB ) it slows down far too much. Is there a way to better share files between our computers? We are on a wireless network and the whole school shares the same servers, we have around probably 400 computers in the school. Is there a hardware fix I can do? Something like buying an external and hooking only yearbook computers to it?

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  • Fastest sorting algorithm for a specific situation

    - by luvieere
    What is the fastest sorting algorithm for a large number (tens of thousands) of groups of 9 positive double precision values, where each group must be sorted individually? So it's got to sort fast a small number of possibly repeated double precision values, many times in a row. The values are in the [0..1] interval. I don't care about space complexity or stability, just about speed.

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  • Is C# fast enough for games

    - by Matt
    Will a game written in C# have any speed issues after long periods of play, like for 24 hours at a time? I'm specifically talking about a 2D RPG similar to old Final Fantasy or Dragon Quest games. I know that languages like Python will slow down too much, curious how C# would stand.

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  • R or Python for file manipulation

    - by danspants
    I have 4 reasonably complex r scripts that are used to manipulate csv and xml files. These were created by another department where they work exclusively in r. My understanding is that while r is very fast when dealing with data, it's not really optimised for file manipulation. Can I expect to get significant speed increases by converting these scripts to python? Or is this something of a waste of time?

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  • Jquery UI Tabs, control variable lenght spent on each tab?

    - by Robin
    I'm trying the following to control the speed of rotation of the tabs but with no luck, any ideas? $('#featured').tabs({ onShow: function(event, ui) { if(ui.index == 0)> { $('#featured').tabs("rotate", 2000, true); } else if(ui.index == 1){ $('#featured').tabs("rotate", 5000, true); } else if(ui.index == 2){ $('#featured').tabs("rotate", 10000, true); } } });

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  • Poor performance / speed of regex with lookahead

    - by Hugo Zaragoza
    I have been observing extremely slow execution times with expressions with several lookaheads. I suppose that this is due to underlying data structures, but it seems pretty extreme and I wonder if I do something wrong or if there are known work-arounds. The problem is determining if a set of words are present in a string, in any order. For example we want to find out if two terms "term1" AND "term2" are somewhere in a string. I do this with the expresion: (?=.*\bterm1\b)(?=.*\bterm2\b) But what I observe is that this is an order of magnitude slower than checking first just \bterm1\b and just then \bterm2\b This seems to indicate that I should use an array of patterns instead of a single pattern with lookaheads... is this right? it seems wrong... Here is an example test code and resulting times: public static void speedLookAhead() { Matcher m, m1, m2; boolean find; int its = 1000000; // create long non-matching string char[] str = new char[2000]; for (int i = 0; i < str.length; i++) { str[i] = 'x'; } String test = str.toString(); // First method: use one expression with lookaheads m = Pattern.compile("(?=.*\\bterm1\\b)(?=.*\\bterm2\\b)").matcher(test); long time = System.currentTimeMillis(); ; for (int i = 0; i < its; i++) { m.reset(test); find = m.find(); } time = System.currentTimeMillis() - time; System.out.println(time); // Second method: use two expressions and AND the results m1 = Pattern.compile("\\bterm1\\b").matcher(test); m2 = Pattern.compile("\\bterm2\\b").matcher(test); time = System.currentTimeMillis(); ; for (int i = 0; i < its; i++) { m1.reset(test); m2.reset(test); find = m1.find() && m2.find(); } time = System.currentTimeMillis() - time; System.out.println(time); } This outputs in my computer: 1754 150

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  • Getting up to speed on modern architecture

    - by Matt Thrower
    Hi, I don't have any formal qualifications in computer science, rather I taught myself classic ASP back in the days of the dotcom boom and managed to get myself a job and my career developed from there. I was a confident and, I think, pretty good programmer in ASP 3 but as others have observed one of the problems with classic ASP was that it did a very good job of hiding the nitty-gritty of http so you could become quite competent as a programmer on the basis of relatively poor understanding of the technology you were working with. When I changed on to .NET at first I treated it like classic ASP, developing stand-alone applications as individual websites simply because I didn't know any better at the time. I moved jobs at this point and spent the next several years working on a single site whose architecture relied heavily on custom objects: in other words I gained a lot of experience working with .NET as a middle-tier development tool using a quite old-fashioned approach to OO design along the lines of the classic "car" class example that's so often used to teach OO. Breaking down programs into blocks of functionality and basing your classes and methods around that. Although we worked under an Agile approach to manage the work the whole setup was classic client/server stuff. That suited me and I gradually got to grips with .NET and started using it far more in the manner that it should be, and I began to see the power inherent in the technology and precisely why it was so much better than good old ASP 3. In my latest job I have found myself suddenly dropped in at the deep end with two quite young, skilled and very cutting-edge programmers. They've built a site architecture which is modelling along a lot of stuff which is new to me and which, in truth I'm having a lot of trouble understanding. The application is built on a cloud computing model with multi-tenancy and the architecture is all loosely coupled using a lot of interfaces, factories and the like. They use nHibernate a lot too. Shortly after I joined, both these guys left and I'm now supposedly the senior developer on a system whose technology and architecture I don't really understand and I have no-one to ask questions of. Except you, the internet. Frankly I feel like I've been pitched in at the deep end and I'm sinking. I'm not sure if this is because I lack the educational background to understand this stuff, if I'm simply not mathematically minded enough for modern computing (my maths was never great - my approach to design is often to simply debug until it works, then refactor until it looks neat), or whether I've simply been presented with too much of too radical a nature at once. But the only way to find out which it is is to try and learn it. So can anyone suggest some good places to start? Good books, tutorials or blogs? I've found a lot of internet material simply presupposes a level of understanding that I just don't have. Your advice is much appreciated. Help a middle-aged, stuck in the mud developer get enthusastic again! Please!

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  • What is the fastest language? [closed]

    - by Murtez
    I'm looking to make a site with a database, user accounts, and possibly more later on (subscriptions, bidding, payment, any any possible # of upgrades). Website speed is VERY important, what is the fastest secure language / method to make it in?

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  • Graphics/Vision Interesting Topics

    - by Myx
    Hello: I would like to do an interesting project for a computer graphics course. I know that there is a lot of literature out there (i.e. SIGGRAPH conference papers). I have a very large range of interest with regard to computer graphics (i.e. image processing, 3D modeling, rendering, animation). However, I've only taken computer vision/graphics for 2 semesters and thus don't have too much background experience, except for the class projects that I had to do. I've been looking through SIGGRAPH papers trying to see if there is anything that will be of interest to me but the literature is extremely vast. I was wondering if anyone has any topic suggestions, anything interesting that you ran across that you could recommend. I would prefer to do something fun yet slightly challenging (not really interested in making a shooter game). If this question does not belong here, I apologize and please let me know where I should move it. Thanks!

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  • How powerful of a PC do you need to edit HD videos?

    - by Xeoncross
    I have a Core2Quad Q8200 (2.3GHz) with 4GB of RAM, a 512MB PCIe video card, and a SATA-2 HD. Yet it still isn't fast enough to edit 720i/p video in Sony Vegas or Adobe Premiere/Aftereffects. My RAM usage never peaks over 1.6GB, but my CPU cores make it to 95% quick! Right now the preview panes in all these programs lag to bad to actually work on the videos. I get to see 1-3 frames every second or two! So how fast do I have to go? At what point will my CPU be fast enough to actually edit these videos? I have to assume that regular people and their regular sub $2k computers can actually work with this footage. Another way to answer this is, how fast is the PC you used to edit videos? Update: I'ts worth noting that now that I have Adobe Pre/AF CS4 I am more interested in getting that working than my older Vegas 6. If you didn't have to re-run RAM preview every, single, time you made one change it would be my answer. But since I like to test many filters and effects before choosing one - I have to re-render a 1-sec section of footage over-and-over and it drives me nuts waiting. Perhaps a motherboard with Dual Xeon chips or something would be able to handle this. It would probably be as much as a dual-crossfire setup and would also speed up other applications.

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  • Building a PC, advice on SSD/Hybrid Hard Drives

    - by Jamie Hartnoll
    I am looking at building a new PC, it's mainly for office (graphics heavy) use and programming. Looking for good performance with opening and closing programs and files as well as a fast boot. I plan to have 3 primary hard drives Windows 7 Programs (photoshop etc) Current Files (There'll also be a large storage capacity back up drive, but this will be the Seagate drive I already have.) So, my question is, looking at standard "old fashioned" hard drives and SSD drives, obviously there's a massive price difference. I have been looking at drives like this: http://www.ebuyer.com/268693-corsair-120gb-force-3-ssd-cssd-f120gb3-bk-cssd-f120gb3-bk and this: http://www.ebuyer.com/321969-momentus-xt-750gb-sata-2-5in-7200rpm-hybrid-8gb-ssd-in-st750lx003 Having no experience of using either I don't know what's the most efficient thing to go for. Clearly the SSD will have better performance, but: If, for example, I had an SSD for Windows (say about 100gB), that would clearly give me the boot speed I want, then I guess my real questions are: If I were to buy one more SSD, would it give the greatest improvement on standard performance if used to store programs, or currently used files? Given that the OS is on an SSD, should I not bother with the 3 drives and instead, partition that Hybrid drive to store programs and currently used files on it? Obviously, option two is cheaper and option one could cause me storage issues, but that's when I can dump files I am not currently using onto another drive. Any, I am open to suggestions... so what do you suggest?!

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