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• I can't boot into Ubuntu "Try (hd0,0): NTFS5: No ang0" Error Message

  - by Joe

  I recently installed Ubuntu 12.04 alongside windows 7. It was working fine but now when I try to boot with ubuntu after the operating system choice screen I get this. Boot Error Message Try (hd0,0): NFTS5: No ang0 Try (hd0,1): NTFS5: No ang0 Try (hd0,2): NTFS5: No ang0 Try (hd0,3): Extended: Try (hd0,4): NTFS5: No ang0 Try (hd0,5): Extended: Try (hd0,5): EXT2: And when I press ctrl+alt+del it restarts the computer and if I chose to boot with ubuntu same thing happens again. But windows works fine.. How do I resolve this problem? Thanks.

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• Wine is no longer able to initialize OpenGL

  - by nebukadnezzar

  Since a while, wine is no longer able to initialize OpenGL on my 64bit Linux. This is by no means a unique problem to me- Lots of people with nvidia cards running 64bit linux seem to have this problem with wine on oneiric: http://forum.winehq.org/viewtopic.php?p=66856&sid=9d6e5ad628ee6fb6e5ef04577275daed http://forum.pinguyos.com/Thread-Wine-OpenGl-Problem https://bbs.archlinux.org/viewtopic.php?id=137696 And while some launchpad bug reports say one should use this workaround: LD_PRELOAD=/usr/lib32/nvidia-current/libGL.so.1 wine <app> It unfortunately does not solve the problem at all for me; That is, if i'd run CS:S, the game will run just fine for a while, but will abort after some time, including a range of GLSL-related errors. Here the startup errors from simply running steam: + wine steam.exe fixme:process:GetLogicalProcessorInformation ((nil),0x33e488): stub [.. snip ...] fixme:dwmapi:DwmSetWindowAttribute (0x1009a, 3, 0x33d384, 4) stub fixme:dwmapi:DwmSetWindowAttribute (0x1009a, 4, 0x33d374, 4) stub err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! [... this error is being reported a few dozen times, so snip again ...] err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! err:wgl:is_extension_supported No OpenGL extensions found, check if your OpenGL setup is correct! fixme:iphlpapi:NotifyAddrChange (Handle 0x47cdba8, overlapped 0x45dba80): stub fixme:winsock:WSALookupServiceBeginW (0x47cdbc8 0x00000ff0 0x47cdbc4) Stub! [... snip ...] Here are the errors reported while running, and after running (because the log is huge-ish, it's pasted elsewhere): http://paste.ubuntu.com/901925/ Now, 32bit OpenGL works just fine; The 32bit executables of Nexuiz, for example, work just fine. That being said, I'm suspecting that this is a problem of wine itself. I've already manually built the git version of wine, to no avail. So what's going on? Is something broken? How do I check (correctly) whether something is broken? How do I solve this?

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• Ubuntu 12.04 installation never finishes

  - by Eric Carlsson

  I am trying to install Ubuntu 12.04 on an old Dell Latitude C400 laptop previously running windows XP using an Ubuntu install CD. The OS runs fine off the CD if a bit slow, and the installation starts off fine. However once the progress bar is filled I get put back to the desktop and nothing happens, first I assumed that the installation was completed but when I restarted the computer and booted from the hard drive nothing happened. I tried to install a few more times but the same thing happens. Am I doing something wrong? I do not get a error message or a installation complete notification. Is there any way I could get some kind of debug screen or log to see if something went wrong or at least follow the installation progress in more detail. Thanks for the help.

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• An increase to 3 Gig of RAM slows down Ubuntu 10.04 LTS

  - by williepabon

  I have Ubuntu 10.04 running from an external hard drive (installed on an enclosure) connected via USB port. Like a month or so ago, I increased RAM on my pc from 2 Gigs to 3 Gigs. This resulted on extremely long boot times and slow application loads. While I was understanding the nature of my problem, I posted various threads on this forum ( Questions # 188417, 188801), where I was advised to gather speed tests, and other info on my machine. I was also suggested that I might have problems with the RAM installed. Initially, I did not consider that possibility because: 1) I did a memory test with a diagnostic program from DELL (My pc is from Dell) 2) My pc works fine with Windows XP (the default OS), no problems with memory 3) My pc works fine when booting with Ubuntu 10.10 memory stick, no speed problems 4) My pc works fine when booting with Ubuntu 11.10 memory stick, no speed problems Anyway, I performed the memory tests suggested. But before doing it, and to check out any possibility of hardware issues on the hard drive, I did the following: (1) purchased a new hard drive enclosure and moved my hard drive to it, (2) purchased a new USB cable and used it to connect my hard drive/enclosure setup to a different USB port on my pc. Then, I performed speed tests with 1 Gig, 2 Gigs and 3 Gigs of RAM with my Ubuntu 10.04 OS. Ubuntu 10.04 worked well when booted with 1 Gig or 2 Gigs of RAM. When I increased to 3 Gigs, it slowed down to a crawl. I can't understand the relationship between an increase of 1 Gig and the effect it has in Ubuntu 10.04. This doesn't happen with Ubuntu 10.10 and 11.10. Unfortunately for me, Ubuntu 10.04 is my principal work operating system. So, I need a solution for this. Hardware and system information: DELL Precision 670 2 internal SATA Hard drives Audigy 2 ZS audio system Factory OS: Windows XP Professional SP3 NVidia 8400 GTS video card More info: williepabon@WP-WrkStation:~$ uname -a Linux WP-WrkStation 2.6.32-38-generic #83-Ubuntu SMP Wed Jan 4 11:13:04 UTC 2012 i686 GNU/Linux williepabon@WP-WrkStation:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.4 LTS Release: 10.04 Codename: lucid Speed test with the 3 Gigs of RAM installed: williepabon@WP-WrkStation:~$ sudo hdparm -tT /dev/sdc [sudo] password for williepabon: /dev/sdc: Timing cached reads: 84 MB in 2.00 seconds = 41.96 MB/sec Timing buffered disk reads: 4 MB in 3.81 seconds = 1.05 MB/sec This is a very slow transfer rate from a hard drive. I will really appreciate a solution or a work around for this problem. I know that that there are users that have Ubuntu 10.04 with 3 Gigs or more of RAM and they don't have this problem. Same question asked on Launchpad for reference.

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• Why is /dev/rfcomm0 giving PySerial problems?

  - by Travis G.

  I am connecting my Ubuntu box to a wireless readout setup over Bluetooth. I wrote a Python script to send the serial information through /dev/rfcomm0. The script connects fine and works for a few minutes, but then Python will start using 100% CPU and the messages stop flowing through. I can open rfcomm0 in a serial terminal and communicate through it by hand just fine. When I open it through a terminal it seems to work indefinitely. Also, I can swap the Bluetooth receiver for a USB cable, and change the port to /dev/ttyUSB0, and I don't get any problems over time. It seems either I'm doing something wrong with rfcomm0 or PySerial doesn't handle it well. Here's the script: import psutil import serial import string import time sampleTime = 1 numSamples = 5 lastTemp = 0 TEMP_CHAR = 't' USAGE_CHAR = 'u' SENSOR_NAME = 'TC0D' gauges = serial.Serial() gauges.port = '/dev/rfcomm0' gauges.baudrate = 9600 gauges.parity = 'N' gauges.writeTimeout = 0 gauges.open() print("Connected to " + gauges.portstr) filename = '/sys/bus/platform/devices/applesmc.768/temp2_input' def parseSensorsOutputLinux(output): return int(round(float(output) / 1000)) while(1): usage = psutil.cpu_percent(interval=sampleTime) gauges.write(USAGE_CHAR) gauges.write(chr(int(usage))) #write the first byte #print("Wrote usage: " + str(int(usage))) sensorFile = open(filename) temp = parseSensorsOutputLinux(sensorFile.read()) gauges.write(TEMP_CHAR) gauges.write(chr(temp)) #print("Wrote temp: " + str(temp)) Any thoughts? Thanks. EDIT: Here is the revised code, using Python-BlueZ instead of PySerial: import psutil import serial import string import time import bluetooth sampleTime = 1 numSamples = 5 lastTemp = 0 TEMP_CHAR = 't' USAGE_CHAR = 'u' SENSOR_NAME = 'TC0D' #gauges = serial.Serial() #gauges.port = '/dev/rfcomm0' #gauges.baudrate = 9600 #gauges.parity = 'N' #gauges.writeTimeout = 0 #gauges.open() gaugeSocket = bluetooth.BluetoothSocket(bluetooth.RFCOMM) gaugeSocket.connect(('00:06:66:42:22:96', 1)) filename = '/sys/bus/platform/devices/applesmc.768/temp2_input' def parseSensorsOutputLinux(output): return int(round(float(output) / 1000)) while(1): usage = psutil.cpu_percent(interval=sampleTime) #gauges.write(USAGE_CHAR) gaugeSocket.send(USAGE_CHAR) #gauges.write(chr(int(usage))) #write the first byte gaugeSocket.send(chr(int(usage))) #print("Wrote usage: " + str(int(usage))) sensorFile = open(filename) temp = parseSensorsOutputLinux(sensorFile.read()) #gauges.write(TEMP_CHAR) gaugeSocket.send(TEMP_CHAR) #gauges.write(chr(temp)) gaugeSocket.send(chr(temp)) #print("Wrote temp: " + str(temp)) It seems either Ubuntu must be closing /dev/rfcomm0 after a certain time or my Bluetooth receiver is messing things up. Even when the BluetoothError arises, the "connected" light on the receiver stays illuminated, and it is not until I power-cycle to receiver that I can reconnect. I'm not sure how to approach this problem. It's odd that the connection would work fine for a few minutes (seemingly a random amount of time) and then seize up. In case it helps, the Bluetooth receiver is a BlueSmirf Silver from Sparkfun. Do I need to be trying to maintain the connection from the receiver end or something?

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• Windows 8 changes GRUB2 in every boot!

  - by yxd

  I've installed Win8 and Ubuntu 12.10 both UEFI style (win8 first then ubuntu). GRUB2 shows me Both Ubuntu and Win8 entries. If I boot into Ubuntu is fine. I could reboot anytime I will see GRUB2 unchanged. The story changes when I Boot into Win8. When I boot to Win8 using GRUB2 it takes me to the Windows Boot manager (which only has the Windows 8 entry). I hit Windows and it boots fine. When I reboot, there's no GRUB2 nor Win loader. It has no boot loader. I boot a liveCD and download boot-repair and everything is back. It's a never ending cycle. Is GRUB2 supposed to load the Win boot loader? What can I do to fix it?

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• No Sound card detected in Sound Settings, although sound works

  - by usertwelve

  I have Ubuntu 12.04 installed on my laptop. When I go to Sound Settings while logged into my user, no sound card appears detected. In spite of this, the sound on my laptop is working ok, and I can use alsamixer just fine. The Unity sound indicator is dead, and this is quite annoying. If I login as guest, the sound indicator works just fine, I assume it's something related to my user's sound settings, but I cannot find what exactly. Any clues?

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• Plex Media Server: Won't find media External Hard Drive

  - by grayed01

  I am attempting to turn an older PC into a home media server with Ubuntu 12.04 using Plex Media Server. I have a newer WD 2 TB external USB HD with all of my media on it. I can not for the life of me figure out why Plex will not recognize the files on this hard drive. It shows the external as there, Ubuntu shows the files and allows me to play them, view them, etc. Plex shows the name "External". But when I click it, it is 100% empty and shows nothing to add. I can access the files on the external through file sharing just fine, on my windows computers but would love to be able to use Plex for streaming with our Roku. I am fairly new to Ubuntu, I have used Plex with the same HD on Windows and it worked fine. I have read multiple articles on this and nothing seems to be doing the trick. How can I solve this?

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• problem with css or browser

  - by ntechi

  i got an image behind my google adsense, the css code of that background image is: background: transparent url("http://i53.tinypic.com/2lu8jgg.jpg") repeat-x left bottom; padding-bottom:10px; padding-top:0px; height: 352px; padding-bottom:5 0px; padding-left:50px; padding-right:50px; padding-top:280px; width: 350px; this works fine in mozilla firefox, but when i open my website in google chrome browser the background image is crapped, it is spread in the entire background, whereas it works fine in mozilla and rock-melt, whats the actual problem my website is: http://mbas.in/

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• libreoffice on Mint14 problem : save as 2003 doc

  - by Philip Van Cleven

  When saving a doc file (MS office 2003) as a doc file, libreoffice crashes and the file without any updates goes into recovery mode ... I installed mint14 from scratch and did not modify anything the odd thing with mint13 and libreoffice, there is no problem (save as works fine) with an upgraded mint14, there is no problem (save as works fine) this happed on acer one d522 machine and a no-name PC (amd based) both are running a 64 bit version of mint (virgin install) the other machines : - acer X1370 upgraded mint14 and - a dell 1520 (mint13 out of the box) do not show this proble please help... something I forgot or a bug? Philip Van Cleven

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• dsl modem problem in ubuntu 11.10

  - by Misterious

  Earlier I used Windows 7 and the modem used to work absolutely fine. Even when it disconnected it used to reconnect automatically without any trouble. But then I installed Ubuntu 11.10 on dual boot and set up the modem connection properly but the modem now disconnects much more frequently(eariler it disconnected once in 5 hours or so and after ubuntu in 5 minutes!!). Also once disconnected it does not reconnect even when i have checked the connect automatically button. I have to restart the system to reconnect it. Also then I clean installed windows and modem works perfectly fine again. What is the reason for this and how can I solve this? I really want to use ubuntu but due to this problem I cant. Sorry for my poor English.

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• Theme changes after resuming from suspend in 10.10

  - by mouche

  I'm using a Dell Inspiron 1520 and Ubuntu 10.10. I've read a lot of questions about graphics problems after resuming from suspend, but most of them are much more serious than mine. I can boot, login and use Ubuntu fine. The problem is that my theme for my top bar and bottom bar changes to gray and blocky (not rounded). Oddly enough, the theme for the title bars of my windows stay the same dark theme. Any ideas how I can fix this? It works fine if I logout and log back in.

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• Pins on Pinterest link to 404 - yet link is valid

  - by Damian Rees

  this is a really strange one. I've set up a bunch of pins on Pinterest linking through to our services which all work fine. Then I decided to do the same on our blog articles (we use Wordpress), yet everytime I click the link (and I've done this on different computers) the link goes to a 404 page on our site. However the link is valid and if you right click the pin and open in new window it opens fine. I have contacted Pinterest who are next to useless. I have also tried different browsers, different computers and different Pinterest accounts. I can't see any weirdness in my htaccess files causing this so I'm a little stumped. Any suggestions?

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• How do I fix an overheating problem with an HP ENVY-4 ultrabook?

  - by ashutosh jain

  I have bought a new HP ENVY-4 ultrabook. It has an i5 processor, preinstalled windows7 and 2GB radeon graphics card. What happened was when I started using ubuntu it showed overheating. I ignored it but after a few days it burnt my laptop battery to 0% capacity. It was just one month old so I got the battery replaced for free. I tried installing linux mint but it also showed overheating. I tried fedora17 but it didn't installed fine. On windows it is running perfectly fine and it's not even heating a bit. Now anyone please suggest whats the problem with ubuntu and how can I overcome with it. I am a computer science guy so I can't work without linux and this machine is then like a waste for me.

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• Error while trying to run project: Unable to start program &lsquo;&hellip;&rsquo;. The endpoint was not reachable.

  - by Marko Apfel

  During playing with Entity Framework I got the error: “Error while trying to run project: Unable to start program ‘'…’. The endpoint was not reachable.   By running the project in Visual Studio. Outside VS were no problems. A similar project runs fine. So I compared both project files. Indeed the first project file contains the line: <Prefer32bit>false</Prefer32bit> in some property groups. After deleting this line everything runs fine.

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• Disabling depth write trashes the frame buffer on some GPUs

  - by EboMike

  I sometimes disable depth buffer writing via glDepthMask(GL_FALSE) during the alpha rendering of a frame. That works perfectly fine on some GPUs (like the Motorola Droid's PowerVR), but on the HTC EVO with the Adreno GPU for example, I end up with the frame buffer being complete garbage (I see traces of the meshes I rendered somewhere, but the entire screen is mostly trashed). If I force glDepthMask to be true the entire time, everything works fine. I need glDepthMask to be off during parts of the alpha rendering. What can cause the framebuffer to get destroyed by turning the depth writing off? I do clear the depth buffer initially, and the majority of the screen has pixels rendered with depth writing turned on first before I do additional drawing with it turned off.

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• No sound output from headphone jack Ubuntu12.04

  - by Subcomfreak

  I have just bought a new ASUS u47vc computer. I have installed ubuntu 12.04 on it alongside windows 7 with no problems what so ever. Howevr, there is one issue that must be resolved. I can not get sound to come from the audio jack. The laptop's speakers work fine. It plays music and sound files fine with the internal speaks. However, when I plug in my headphones (or external speakers) the internal speakers mute (as they should) and nothing comes out of the headphones. Here are some outputs that might help: alsa information script: http://www.alsa-project.org/db/?f=82de5623cbdeeeae955cba02d7afe1a4b3fca965 Hope this problem can be fixed! Thank you in advance!!!

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• Wireless iwconfig rate auto too low

  - by Jamie Kitson

  Hi, left to its own devices my wireless connects at too low a speed. I have a 20meg internet connection and my wireless is slowing it down to like 3meg. When I reboot into windows it's fine. When I run iwconfig eth1 rate 24M or even 48M the connection is much faster and runs fine, why won't it automatically go higher? Is this the fault of the driver? I am running Broadcom's driver compiled from source. Would adding iwconfig eth1 rate 24M to rc.local be the right way to force it at boot? Output from iwconfig when rate=auto: eth1 IEEE 802.11 ESSID:"honeypot" Mode:Managed Frequency:2.417 GHz Access Point: xxx Bit Rate=1 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=5/5 Signal level=-47 dBm Noise level=-91 dBm Rx invalid nwid:0 Rx invalid crypt:2 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 Thanks, Jamie

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• Mounting with Nautilus works but fstab gives "Host is down" error?

  - by Annan

  I'm connecting to my university's VPN so I can connect to the network drive. The VPN seems to be working fine and I can connect to the drive by typing the address into Nautilus and entering my login details: smb://139.___.___.140/home However, this fstab entry doesn't work: //139.___.___.140/home /media/___ cifs domain=CS,username==___,password=___,uid=sai,gid=sai 0 0 Nor does manually mounting it: sudo mount -t cifs //139.___.___.140/home /media/___ -o domain=CS,username=___,password=___,uid=sai,gid=sai,user The only error it gives is: mount error(112): Host is down Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) It's obvious the host isn't down since I can view the share from Nautilus. Why is Nautilus mounting it fine but not the normal mount command? What could cause this error?

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• Graphics card fan is loud (additional graphics card drivers cause problems)

  - by tk4muffin

  Okay this explanation is a bit longer ... but I start at the beginning: I've been using Windows 7 for a very long time, shortly after the release of v12.10 I installed Ubuntu via Windows installer. Everything worked fine but the fan of the graphics card. After a bit of research I found out, that I just had to select a different driver (nvidia-current (proprietary, tested) worked pretty well). This also fixed some graphical bugs when I just logged into my account. Due to my university I got a MSDNAA-Account (allows me to download every Windows OS for free). I downloaded and installed Windows 8. After configuration I installed ubuntu via the Windows installer once again and the first couple launches of ubuntu went well. Suddenly ubuntu didn't launched anymore...caused by some hard-disk errors and had no clue what to do. So I kept working on Windows 8 - unfortunately. After playing around with the new Windows, I put my PC to sleep-mode. I couldn't wake my PC up and it wasn't responding to anything (neither mouse-movement, -clicks or keyboard strokes, nor the power-button and the reset-button worked), so I pulled the plug. Turns out, this was a huge mistake. Somehow the BIOS broke and after restarting a couple of times, the BIOS repaired itself. Neither Windows 8, nor ubuntu where bootable. Now I had to install ubuntu several times, because after rebooting unity was hidden and I didn't know what the problem was and how to fix it. I finally realized that this problem was caused by the graphics card driver, which I've changed to the nvidia-current (This dirver worked fine before my PC "crashed"). So I installed Windows 8 again and after a bit of usage I installed ubuntu once again (via DVD). The booting of ubuntu and windows works fine - so far. But I'm still not able to change the graphics card driver without unity hiding away after restarting the OS. The noisy fan is really disturbing my work... PC Specs: Processor: Intel Core 2 Duo COU E8400 @ 3GHz x2 Memory: 7.8 GB OS type: 64-bit Graphics Card: GeForce 9600 GT Motherboard: Asus P5Q I hope the information given are enough.

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• Anyone know how to get an LTSP image working with VIA VX855 chipset?

  - by Bryan

  I'm running an LTSP server on Ubuntu 11.10 and can load the i386 image via PXE boot on a VirtualBox VM just fine. However, when I PXE boot a Dell FX130 thin client on the LTSP network the login screen ends up being a white screen with a bunch of wavy black lines going up and down it. The 11.10 splash screen displays just fine as the image is booted, then I get a "INVALID CARD NUMBER" message, then a black screen, then finally the white screen with wavy lines. I'm not sure if the "INVALID CARD NUMBER" message has anything to do with the issue, but in the end the white screen with wavy lines makes me think it's a video driver problem. On the LTSP server, I chrooted into /opt/ltsp/i386 and made sure xserver-xorg-video-openchrome was installed. I did notice that no xorg.conf exits in /etc/X11 though.

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• Macbook Pro 8,1 - wireless interface not showing up

  - by Florian Margaine

  I've installed Ubuntu 11.10 on my Macbook Pro 8,1. Everything went fine and everything installs fine except for the wireless interface. I've installed the b43 module according to these instructions: https://help.ubuntu.com/community/MacBookPro8-1/Natty#Wireless I've tried compiling the module, ndiswrapper and also the last solution mentioned using this PPA: ppa:zwaldowski/ppa. With the three solutions, the module loads finely. It works smoothly. lspci shows the wireless card without problem. But there is no wireless interface. iwconfig or ifconfig both show eth0 and lo as interfaces, but no eth1 or wlan0 interface is showing up. I have no idea why, and I'm completely stuck there.

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• Wecam not detected

  - by Richard

  after much research ang googling, my web cam is still not recognized. In the time of Ubuntu 11.04 it was working fine. I did a fresh install of 11.10 and not more web cam. All the cheese and camera monotor and V4L tests and all failes with "cannot connect to /dev/video0" or equivalent. The output of 'lsusb' shows the webcam Bus 001 Device 002: ID 05a9:2640 OmniVision Technologies, Inc. OV2640 Webcam What I noticed is that neither /dev/v4l nor /dev/video* exists. If I re-install the v4l package all the /dev/video* are created, but no /dev/v4l If I reboot the /dev/video* are NOT created. I think the trouble is that the device are not created at boot time. I have a DELL Inspiron 1525 and until this fresh install the web cam worked fine. Can somebody help ? Thanks a lot Richard

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• Timeout Considerations for Solicit Response – Part 2

  - by Michael Stephenson

  To follow up a previous article about timeouts and how they can affect your application I have extended the sample we were using to include WCF. I will execute some test scenarios and discuss the results. The sample We begin by consuming exactly the same web service which is sitting on a remote server. This time I have created a .net 3.5 application which will consume the web service using the basichttp binding. To show you the configuration for the consumption of this web service please refer to the below diagram. You can see like before we also have the connectionManagement element in the configuration file. I have added a WCF service reference (also using the asynchronous proxy methods) and have the below code sample in the application which will asynchronously make the web service calls and handle the responses on a call back method invoked by a delegate. If you have read the previous article you will notice that the code is almost the same.   Sample 1 – WCF with Default Timeouts In this test I set about recreating the same scenario as previous where we would run the test but this time using WCF as the messaging component. For the first test I would use the default configuration settings which WCF had setup when we added a reference to the web service. The timeout values for this test are: closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"   The Test We simulated 21 calls to the web service Test Results The client-side trace is as follows:   The server-side trace is as follows: Some observations on the results are as follows: The timeouts happened quicker than in the previous tests because some calls were timing out before they attempted to connect to the server The first few calls that timed out did actually connect to the server and did execute successfully on the server   Test 2 – Increase Open Connection Timeout & Send Timeout In this test I wanted to increase both the send and open timeout values to try and give everything a chance to go through. The timeout values for this test are: closeTimeout="00:01:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:10:00"   The Test We simulated 21 calls to the web service   Test Results The client side trace for this test was   The server-side trace for this test was: Some observations on this test are: This test proved if the timeouts are high enough everything will just go through   Test 3 – Increase just the Send Timeout In this test we wanted to increase just the send timeout. The timeout values for this test are: closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:10:00"   The Test We simulated 21 calls to the web service   Test Results The below is the client side trace The below is the server side trace Some observations on this test are: In this test from both the client and server perspective everything ran through fine The open connection timeout did not seem to have any effect   Test 4 – Increase Just the Open Connection Timeout In this test I wanted to validate the change to the open connection setting by increasing just this on its own. The timeout values for this test are: closeTimeout="00:01:00" openTimeout="00:10:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"   The Test We simulated 21 calls to the web service Test Results The client side trace was The server side trace was Some observations on this test are: In this test you can see that the open connection which relates to opening the channel timeout increase was not the thing which stopped the calls timing out It's the send of data which is timing out On the server you can see that the successful few calls were fine but there were also a few calls which hit the server but timed out on the client You can see that not all calls hit the server which was one of the problems with the WSE and ASMX options   Test 5 – Smaller Increase in Send Timeout In this test I wanted to make a smaller increase to the send timeout than previous just to prove that it was the key setting which was controlling what was timing out. The timeout values for this test are: openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:02:30"   The Test We simulated 21 calls to the web service Test Results The client side trace was   The server side trace was Some observations on this test are: You can see that most of the calls got through fine On the client you can see that call 20 timed out but still hit the server and executed fine.   Summary At this point between the two articles we have quite a lot of scenarios showing the different way the timeout setting have played into our original performance issue, and now we can see how WCF could offer an improved way to handle the problem. To summarise the differences in the timeout properties for the three technology stacks: ASMX The timeout value only applies to the execution time of your request on the server. The timeout does not consider how long your code might be waiting client side to get a connection. WSE The timeout value includes both the time to obtain a connection and also the time to execute the request. A timeout will not be thrown as an error until an attempt to connect to the server is made. This means a 40 second timeout setting may not throw the error until 60 seconds when the connection to the server is made. If the connection to the server is made you should be aware that your message will be processed and you should design for this. WCF The WCF send timeout is the setting most equivalent to the settings we were looking at previously. Like WSE this setting the counter includes the time to get a connection as well as the time to execute on a server. Unlike WSE and ASMX an error will be thrown as soon as the send timeout from making your call from user code has elapsed regardless of whether we are waiting for a connection or have an open connection to the server. This may to a user appear to have better latency in getting an error response compared to WSE or ASMX.

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• Test iPhone app on iPad mini?

  - by Devfly

  I have developed an iPhone app, right now I only need a device for testing. I have 300$, and two choices - second hand iPhone 4, or brand new iPad mini. The better choice obviously is the iPad, but is it sufficient for testing iPhone apps on? On the iPad, iPhone apps can run just fine in 2X mode, but are there any differences between the app performance on iPhone and iPad (except the chipset). Should I test my app on actual iPhone, or the iPad will suffice? My app is RSS reader, not some game, so I think everything will be fine with testing on iPad mini. If I buy the iPad I will find some friends iPhone 4/3gs running iOS 5.1 (because my app's deployment target is 5.1, and the iPad comes with 6.0), but of course I can't extensively test on this iPhone. Thank you!

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