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• Justification of Amazon EC2 Performance

  - by Adroidist

  I have a .jar file that represents a server which receives over TCP an image in bytes (of size at most 500 kb) and writes it file. It then sobels this image and sends it over TCP socket to the client side. I ran it on my laptop and it was very fast. But when I put it on Amazon EC2 server m1.large instance, i found out it is very slow - around 10 times slower. It might be the inefficiency in the code algorithm but in fact my code is nothing but receive image (like any byte file) run the sobel algorithm and send. I have the following questions: 1- Is it normal performance of Amazon EC2 server- I have read the following links link1 and link2 2- Even if the code is not that efficient, the server is finally handling a very low load (just one client), does the "inefficient" code justify such performance? 3- My laptop is dual core only...Why would the amazon ec2 server have worse performance that my laptop? How is this explained? Excuse me for my ignorance.

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• MacBook Pro USB port provides more current in Mac OS X than in Windows

  - by AngryHacker

  I have a MacBook Pro with both Mac OS X Lion and Windows (under BootCamp) installed. While in Windows, I tried to charge my iPad 3 via the USB port. The iPad says "Not charging", but really, it does, just super slow (4-5% per hour). The reason for this is that the iPad requires 2.1 A of current, but a standard USB port provides 0.5 A. However, if I switch to Mac OS X, the iPad states that it is charging and it does at a rate of about 10% per hour. The only takeaway from this is that either OS X puts out more current on the USB port or that it recognizes the iPad and acts accordingly. Can someone provide more information on what is actually happening?

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• Rate of UDP packet loss over WLAN

  - by Martin

  While testing something with TFTP I noticed lots of timeouts (and slow speed as result) when I used my WLAN - and no problems when using a network cable. A quick test program sending/receiving UDP revealed that there are about 3-5% packets lost. While it's obvious that WLAN has to be less reliable than LAN, I have no knowledge what loss rates are considered 'normal' - and when there is a need to further investigate the network infrastructure. Are there 'typical' packet loss rates on WLAN (and other network technologies e.g. PowerLAN, WAN, ...? Thanks

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• Is it possible to continue torrent downloads from other client

  - by Nrew

  I have downloaded a torrent file but I downloaded it using bitlord. And because bit lord doesnt have the ability like initial seeding. I decided to use utorrent. Ive already tried to continue it. What I did was to: Opened the original torrent file in utorrent. Target where the incomplete bitlord incomplete file was. But it seems that utorrent isn't detecting the file and it makes another copy of it and start to download from the beginning. Im at about 80 percent and there are only 18 seeds but there's 17 leech. And my connection is slow so I really have to initial seed. Other details: I've reformatted the original machine where I downloaded it. Also didn't copy the original application.

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• Is there a free, lightweight iTunes replacement for Windows?

  - by elsni

  Related: Is there an alternative to iTunes? (for Windows or Mac) thats free? I'm looking for a free, lightweight iTunes replacement for my Windows XP Netbook. iTunes itself is slow and bloated. The software should be able to read the iTunes library, espeacially the ratings of the songs and the intelligent playlists. I don't need the sync to an iPod because I don't own one, I used iTunes only as a jukebox. I also don't need the store, the podcasts and all the other things iTunes provides. Does someone know a good alternative?

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• Odd Apple AirPort Express behaviour

  - by MatthewD

  I've been using a rather old AirPort Express for home Wi-Fi for a number of years. (It's old enough that it only supports WPA, not WPA2 -- perhaps this is an indication that I should upgrade!) In the last week I've been experiencing very slow internet over the Wi-Fi. Suspecting that someone outside my home was leeching from me (despite a reasonable password and MAC address filtering turned on) I decided to change some settings: I changed the SSID, turned off broadcast of the SSID and changed the password. After these changes, I managed to connect using the new password on my iPad. But on the other devices I tried (iPhone, PS3) I was not able to connect. In fact, I only succeeded in connecting when I entered my OLD password! Is this a known issue with ancient AirPort Express units? Is my unit cracked and unrecoverable?

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• Mobile Intel 965 vs 4 Series chipset speed differences

  - by graham.reeds

  A client of ours is having a problem panning on a mapping application that we write on their panasonic toughbooks (CF-19's). One of their toughbooks the panning is fairly smooth while on the other it is really slow. Doesn't help that they have all the settings turned up, but I would of thought any reasonably new graphics card (even shared memory) would have more than adequate graphic speed. I am pretty sure that the graphic adapter is to blame, but I can't find anything out about either chipset (level of acceleration, non-problems, etc). All I get is the intel data sheets. The faster panning one is on the Mobile Intel 4 Series Express Chipset while the slower is on the Mobile Intel 965 Express Chipset. Is this expected? Does it sound like a driver problem? They both have the same amount of ram and same cpu.

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• Self hosted Wordpress freezes for 20 seconds before sending the page

  - by TheoJones

  I have a website with Wordpress and PHPBB integrated - and it's been fine for months.. then all of a sudden, it's unbelievably slow to load. There are no errors in the apache logs, but looking at the page in firebug shows a 20 second pause, before the page is delivered. more confusing, on the same server, same apache installation, PHPBB loads in 30ms, no delay. I tried the hogdetector wordpress plugin, which indicates that the delay is before the header is sent - which seems to agree with firebug. Any ideas how to troubleshoot this one further?

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• How computers display raw, low-level text and graphics

  - by panic

  My ever-growing interest in computers is making me ask deeper questions, that we don't seem to have to ask anymore. Our computers, at boot, as far as I understand it, are in text mode, in which a character can be displayed using the software interrupt 0x10 when AH=0x0e. We've all seen the famous booting font that always looks the same, regardless of what computer is booting. So, how on earth do computers output graphics at the lowest level, say, below the OS? And also, surely graphics aren't outputted a pixel at a time using software interrupts, as that sounds very slow? Is there a standard that defines basic outputting of vertices, polygons, fonts, etc. (below OpenGL for example, which OpenGL might use)? What makes me ask is why OS' can often be fine without official drivers installed; how do they do that? Apologies if my assumptions are incorrect. I would be very grateful for elaboration on these topics!

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• gtk2/mate apps are choppy on debian testing [migrated]

  - by b0ti

  I have recently upgraded to a core-i7 system and now all the apps from mate (GTK2 based) are very slow. Basically when I switch to a workspace that has a couple mate-terminals open, they are redrawn as if these were sent over the network. GTK3 apps and firefox work properly and are refreshed instantly. I'm running Debian testing. I have tried to reinstall xorg and related packages and everything seems to work fine except for this. Here is my xorg.log. Any hints?

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• MS Access ADP front end and SQL Server back end for field data collection?

  - by Brash Equilibrium

  I am an anthropologist. I am going to the field and will use a netbook to collect survey data. The survey forms will need to allow me to enter data into multiple tables, search tables, allow subforms, and be fast enough to not slow down my interview. I have considered storing the data in a SQL Server Express 2008 R2 server (there will be a lot of data) while using a Microsoft Access data project as a front end. To cut down the number of steps required to collect and store data, I'm considering using the netbook for both data storage and collection (after reading this article about SQL Server on a netbook). My questions are: (1) Is there a simpler solution that is also gratis (gratis because I already have a MS Access license from my workplace, and SQL Server Express is, obviously, free)? (2) Does my idea to store and collect data using the netbook make sense? Thank you.

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• PHP processes run one at a time, always taking 100% of one core

  - by Derek Kurth

  We have seven websites written in PHP running on a Windows 2008 server with IIS 7.5. They are all very slow right now. When I look in Task Manager, I see around 10 php-cgi.exe processes, and they are all taking 0% of the CPU, except one, which is taking 25%. It's a quad-core server, so it's taking 100% of one core. If I watch for a few seconds, the process taking 25% will go to 0%, and a different php-cgi.exe process will jump to 25%. So all the php-cgi.exe processes are just lined up, waiting on a single core, and each process uses 100% of the processor when it can. Each of the 7 sites is in its own application pool in IIS, and we're using FastCGI. The PHP version is 5.3. Any ideas? Thanks!

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• What media formats do I have to use to prevent Zune from having to convert media for Windows Phone?

  - by Billy ONeal

  Zune is able to accept pretty much every media format under the sun, or at least can once someone's installed something like the KLite Codec Pack. However, it does do conversion on your behalf to a more supported format when you try to sync the contents over the Windows Phone. I'd like to not have to wait for the really slow process of doing the conversion... how do I know which media format to download? (For example, there are 5 media formats available for each of the MIX sessions....)

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• Improving Windows Authentication performance on IIS

  - by flalar

  We're struggling with performance issues with a ASP.NET MVC site that is using Windows Authentication. Response time is very slow on the first request to the site when the user is being authenticated. Further, every time the Authorization header is sent from the browser the response time increases with many seconds. The same issue occurs for both executed files and static content like CSS and JS. Access to the application is restricted to users within a certain role and we are now planning to allow access to static files for all authenticated users to see if that helps. The authentication method in use is NTLM. How should we go forward in pinpointing why authentication decreases performance drastically?

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• Windows 7 + NVidia == 640x480 on external projectors

  - by ben2004uk

  Hello, I'm having a major problem and I really need your help! I have a MacBook Air which has the NVidia 9400M. The problem is, when I connect it to an external projector Windows 7 (and Vista) only allow me to connect at 640x480. I need it to use the laptop to present at conferences, as such I need it to work on a number of different projectors - at the moment I need to use OSX and VMWare but it's painfully slow and really doesn't work. At the moment, I'm considering buying a new laptop :( Is there any way to override the screen resolutions provided? I've saw some information around EDID? Thanks Ben

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• How to allow simple file sharing on Windows Server 2008R2 through VPN

  - by Martin Wiboe

  We are a small, distributed company with a Windows Server 2008R2 installation. I would like to set up a way for our employees to connect securely to this server via VPN and then be able to map a network drive. I have gotten this to work somewhat by installing the Network Policy and Access Services Role on the server and using the default settings. I have also created a network share on the server. The problem is that our connectivity is sporadic (sometimes the service stops listening on the port or simply refuses to authorize correct credentials) and slow. I can always connect through VPN, but mapping is problematic. I would be grateful for the answer on how to accomplish this as well as some guidance on whether I am on the right track. Thanks in advance!

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• Windows screen resolution change: lengthen timeout

  - by Jonathan J

  Occasionally I need to change the screen resolution of the console of a Windows virtual machine using XenCenter. When you attempt this change, Windows will revert if you don't accept the changed resolution within 15 seconds of clicking 'apply.' (Normally, this is a good thing.) The problem is that if I have a slow connection between XenCenter and the Xen hypervisor, the virtual console display may not refresh quickly enough to allow me to respond within 15 seconds. As a result, I can't change the resolution, even though the new resolution is valid. Is there a way to increase the timeout before reverting to the original display resolution?

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• How is it possible for SSD's drives to have such a good latency?

  - by tigrou

  First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's are just the opposite. But here is how it works : SSD drives increase their bandwidth by using several NAND flash chips in parallel. In other words, they do some data striping (aka RAID0) across several chips (done by the controller). What i don't understand is how SSD's drives have such a low latency, whereas they are using NAND chips? (or at least lot better than what a typical single NAND chip would do) EDIT: I think under-estimate NAND chip capabilities. USB drives, while powered by NAND's are mostly limited by USB protocol (which have a pretty high latency) and the USB controller. That explain their poor performance in some cases.

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• Experience with MooseFS?

  - by brown.2179

  Anyone have any experience using MooseFS? I want an easy distributed storage platform to store static data archive of about 10 TB and serve it to 20-40 nodes. Also I want to be able to add storage as the archive grows without having to rebuild the filesystem. I don't care if it's a bit slow. I just want it to be simple and stable. Basically from what I can see for OS X it's between MooseFS and Gluster. Any other suggestions?

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• Application runs with different speed for two different user logins on windows server

  - by karthi

  We have a application in Windows Server that download data from SQL server and store in our local machine. Now the problem I have is my Windows Server has two logins and in one login the app runs real slow, like gets 1 row in a minute, and from another login it fetches 20 rows in a minute. We have this problem only for a last couple of days. What could have caused this? More details: SQL server:S QL server2008 Os: Windows server 2008 Access method: Remote connection. Application: Custom .Net application to get data Both accounts are limited rights accounts. Any tools to track this? I am not sure what should I start with.

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• Changing languages rapidly causes Linux to crash.

  - by eZanmoto

  So I'm running Xmonad on my college computer (which runs Kubuntu) and whenever I leave my desk, instead of using x-screensaver which is incredibly buggy and slow, I just change to another workstation, open a terminal and change language to a language which uses symbols instead of letters, and then change back using an aliased command. For example, my .profile has the lines alias qwer="setxkbmap jp" alias *******="setxkbmap ie" where ******* is my password, using japanese characters. Changing languages seems to be much faster than running x-screensaver. The problem: rapidly changing languages seems to crash Linux; it just won't accept input (and it's not because the language hasn't changed back, nothing is output to the console). I can't use Ctrl+Alt+F1..F7, I can't "raise the elephants", anything, it just won't work. I'm just wondering, is this a known issue, and if so, is there something I can do about it?

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• Different versions of 2.5" drives? Unscreawing Intel 320 for slimmer drive to fit newer thinkpads?

  - by hhh

  My x60s laptops come with about 1-2mm heigher 2.5" HDD than newer x220 models. This is totally stupid when one would like to reuse the old drive in the newer laptops. I bought newer 2.5" 320 Intel SSDs and they seem to have such 1-2mm gap to unscrew but I am unsure whether it is meant for opening. Could someone instruct what to do here? Look the manufacturer has started changing the old good 2.5" drives into slightly different versions, now it means slow compability issues to fix or totally new 2.5" drives. Ideas how to proceed? Unscrewing newer 320 drives or are some other versions of 2.5" drives meant for x220? Does there exist some sort of racks to get drives working between different comps? Perhaps booting from laplink is currently the easiest solution to get things working when changing harddrives between comps? Perhaps related http://www.zdnet.com/blog/hardware/seagate-announced-super-slim-25in-momentus-thin-hard-drive/6439

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• encoding movies for the web

  - by ELS

  Hi All, I have a friend that hosts his website on IIS and Windows Server 2003 R2 32-bit. He has .WMV files and .MPG and others and some of these are 30 mb in size! He wonders why users complain the site is slow! So my question is how can we reduce the size of these movies? What software? What settings for bit-rate, etc? Is there free software? I can use either a Mac or a PC. Thoughts are appreciated.

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• How do I change HOMEDRIVE HOMEPATH and HOMESHARE in Windows XP?

  - by user26034

  I have got a laptop which is configured to have the user profile in a network drive. This is causing me a lot of headaches since the connectivity to my company is very slow. I want to relocate the profile of my user into a local directory. How do I do that? Those are the settings at the moment: C:\>set HOME HOMEDRIVE=P: HOMEPATH=\ HOMESHARE=\\SOMESERVER\_myuser$ The drive P is a network drive mapped to HOMESHARE. I can't find where windows is setting those environment variables, not even in the registry. The laptop is running Windows XP.

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• Why does Oracle SQL Developer take so long to open?

  - by oscilatingcretin

  I think anyone who's used Oracle SQL Developer will agree that it's painfully slow on the load. My research has lead me to a solution that seems to have helped a little, and that's telling OSQLD not to check for updates on startup. However, it still takes several minutes to open. What could OSQLD possibly be doing during load time? Is there any way get it to open right away? Edit: Adding potentially relevant system specs: CPU: Intel i5-2520M 2.5 ghz Windows 7 32-bit RAM: 4 gb

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