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• When I plug an HDMI cable into my MacBook Pro with Retina Display, the resolution of the retina display changes

  - by Tyler Crompton

  I had an HDMI cable plugged in for a while that connected to a TV with no power. The retina display randomly flashed blue after a while and then changed to a different resolution (possibly 1080p). I unplugged the HDMI cable and nothing happened. So I restarted the computer to no avail. I was still having issues. So I fiddle with some settings after plugging in the HDMI cable again. Now, the retina display appears fine when no HDMI cable is plugged in, but when there is one plugged in, the resolution changes. I have mirroring turned off (which is what I want). The resolution of the retina display when an HDMI cable is plugged in is 3,360px x 2,100px (according to the size of a screenshot) and the external display is 1,600px is 900px. How can I fix the retina display to show with the correct resolution.

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• How is the 137GB limit counted in Virtual PC (two systems on one disk)?

  - by Nux

  I have a dual boot (Win7, XP) physical machine on my old computer which I want to virtualize and move to my new one. So I've uninstalled everything that I can and run shrink from RescueCD (used GParted). Now I have two about 80GiB partitions with a gap between them, so still this seem to be above the given limit. Still the resulting VHD (made with Disk2vhd) is much below the limit (about 110GiB) and both partitions are below the limit. So my question is - is it failing due to the limitations of disk size for VPC or is failing simply because it's a dual boot system. Or maybe it would work if I would move partitions to be close to each other (the gap between them is about 171GB and the whole physical disk is 1TB)?

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• ImageMagick convert to png32, can't change background at all

  - by Doug

  So I'm stumped. I've been wrestling with this simple command to turn an SVG file into a transparent SVG to no avail. Here's my command convert svg:/home/media/svgTest.svg -quality 100 -background none -size 3300x3300 png32:/home/media/pngTest.png The PNG comes out fine, but the background is white. Upon further investigation - the PNG's background is white no matter what I set the -background option to. I've tried black, tomato4, and even various hex colors. Nothing - just white. My SVG has no background fill layer or anything like that, it's just a couple of blue path layers. Also, I am running ImageMagick v 6.6.9-7 on Ubuntu 12.04 Lts What am I doing wrong? Thanks

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• Tools for tracking disk usage

  - by Carey

  I manage a number of linux fileservers. These all run applications written from 0-10 years ago. As sometimes happens, a machine will come close to, or run out of disk space. Reasons include applications not rotating log files, a machine with 500GB of disk producing 150GB of new files every month that were not written to tape, databases gradually increasing in size, people doing silly things...generally a bit of chaos. Anyway, when a machine unexpectedly goes from 50% to 100% full in a couple of hours, I figure out what broke (lots of "du") and delete files or contact someone. I also can look at cacti graphs to figure out what the machine's normal disk usage is (e.g. for /home). Does anyone know of any tools that will give finer grained information on historial usage than a cacti/RRD graph? Like "/home/abc/xyz increased 50GB in the last day".

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• How to tune Windows 2008r2 and IIS to maximize single file download speeds?

  - by uSlackr

  We recently put up an IIS site (on WinSvr 2008r2) that is used almost exclusively for downloading files over the internet. The data exists as a large collection of .zip files ranging from 1MB - 35GB in size. We want to allow a lot of downloads during a day (more than 500GB) but have implemented an outbound ASA throttle at 60mbps in order to preserve bandwidth for other uses. The total link speed is 100mbps. Here's the interesting part: While we can serve up multiple downloads to hit the 60mbps cap, we cannot get any single download to exceed 2.5M bytes/sec (20 Mbits/s). Is there any TCP or IIS tuning we can do to push up individual download speeds? Or something else to look at?

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• OpenGL : sluggish performance in extracting texture from GPU

  - by Cyan

  I'm currently working on an algorithm which creates a texture within a render buffer. The operations are pretty complex, but for the GPU this is a simple task, done very quickly. The problem is that, after creating the texture, i would like to save it. This requires to extract it from GPU memory. For this operation, i'm using glGetTexImage(). It works, but the performance is sluggish. No, i mean even slower than that. For example, an 8MB texture (uncompressed) requires 3 seconds (yes, seconds) to be extracted. That's mind puzzling. I'm almost wondering if my graphic card is connected by a serial link... Well, anyway, i've looked around, and found some people complaining about the same, but no working solution so far. The most promising advise was to "extract data in the native format of the GPU". Which i've tried and tried, but failed so far. Edit : by moving the call to glGetTexImage() in a different place, the speed has been a bit improved for the most dramatic samples : looking again at the 8MB texture, it knows requires 500ms, instead of 3sec. It's better, but still much too slow. Smaller texture sizes were not affected by the change (typical timing remained into the 60-80ms range). Using glFinish() didn't help either. Note that, if i call glFinish() (without glGetTexImage), i'm getting a fixed 16ms result, whatever the texture size or complexity. It really looks like the timing for a frame at 60fps. The timing is measured for the full rendering + saving sequence. The call to glGetTexImage() alone does not really matter. That being said, it is this call which changes the performance. And yes, of course, as stated at the beginning, the texture is "created into the GPU", hence the need to save it.

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• Syncing Large Directories/Filesystems using USB Drive

  - by Alan Lue

  Does anyone have a solution for syncing large directories/filesystems using just a USB flash drive (and specifically without using a network connection)? The objective is simply to sync a user directory between two computers. The contents of the user directory could amount to a large quantity of data—say, a quantity larger than could be stored on any single USB drive—but the aggregate size of changes that must be propagated by a single sync could easily fit on a USB drive. As an example, suppose a user directory is already synchronized between a desktop and a laptop computer. Here's a use case: Some changes are made in the user directory on the desktop. We mount a USB drive onto the desktop and copy whatever changes need to be applied to the laptop user directory in order to synchronize the desktop and laptop user directories. We now mount the USB drive onto the laptop and apply the changes. The desktop and laptop user directories are now synchronized. Any ideas? Alan

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• How are certain analytics metrics (time on site, etc.) usually distributed?

  - by a barking spider

  I'm not sure if I've come to the right place to ask this question, but I'm gathering some information for a research project. We're trying to design an experiment that'll heavily involve web analytics, and I'm trying to figure out some sensible values of mean +/- standard deviation for the following visitor-level (i.e., visitor 1 spends 2 minutes on site, visitor 2 spends 1 minute -- mean 1.5 +/- 0.71...) metrics: time spent on site page views If time allowed, we would put up the sites and gather the information ourselves, but we have a grant deadline coming up. I realize that even though these the distributions of these quantities are probably going to be heavily skewed towards zero, we'll need some reasonable figures or estimates of these figures in order to do sample size calculations, etc. Anyway, I'm not sure where else I'd turn, and I certainly have had a difficult time finding these values in the prior literature. If someone could direct me to a paper with the right information, or if you have these figures on hand (perhaps taken directly from your logs!) -- that would be amazing, and I'd love to hear from you. Thanks in advance, and even though I'm not allowed to reveal too much, rest assured that this info'll be applied towards a good cause :)

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• Small font all 'new' messages suddenly in Gmail on Ubuntu in Opera, why?

  - by Michael Durrant

  This seemed to happen out of the blue. I have been using Opera for years. I can't find anywhere in Gmail to change the default font that is used in Opera. Ubuntu is Version 11 Opera is version 11.6 In Firefox the font is normal size. I have tried playing around with both all the browser setting I can find plus Ubuntu system settings (I had seen some mentions of Opera using the system default font sometimes) but no success so far. Really bumming as I have been using Opera for two years and if I can't resolve it I will not be able to use it. I can switch to Firefox but I don't want to.

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• How to choose NoSQL database engine?

  - by Poma

  We have a database with following specs: 30k records, 7mb in size 20 inserts/second 1000 updates/second 1000 range selects/second, by secondary index, approx 10 rows each needs at least one secondary index needs some mechanism to expire keys if they are not updated for 75 secs (can be done via programmatic garbage collector but will require additional 'last_update' index and will add some load) consistency is not required durability is not required db should be stored in memory For now we use Redis, but it does not have secondary index and it's keys index:foo:* is too slow. Membase also does not have secondary index (as far as I know). MongoDB and MySQL memory engine have table-level locks. What engine will fit our use case?

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• Syncing Large Directories/Filesystems using USB Drive [closed]

  - by Alan Lue

  Does anyone have a solution for syncing large directories/filesystems using just a USB flash drive (and specifically without using a network connection)? The objective is simply to sync a user directory between two computers. The contents of the user directory could amount to a large quantity of data—say, a quantity larger than could be stored on any single USB drive—but the aggregate size of changes that must be propagated by a single sync could easily fit on a USB drive. As an example, suppose a user directory is already synchronized between a desktop and a laptop computer. Here's a use case: Some changes are made in the user directory on the desktop. We mount a USB drive onto the desktop and copy whatever changes need to be applied to the laptop user directory in order to synchronize the desktop and laptop user directories. We now mount the USB drive onto the laptop and apply the changes. The desktop and laptop user directories are now synchronized. Any ideas? Alan

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• Have I created the recovery disk from recovery partition correctly?

  - by Tim

  I was creating recovery disk from recovery partition on my Lenovo T400 with Windows 7. 6.5 GB of the recovery partition has been occupied. But in the process, I created three DVDs. I might remember wrong, but the first two DVDs were called by the wizard as disk 1, and the third one was called disk 2. The first one has been written 0.22 GB only. Following is the content of the DVD (right click the image and select view the image in a bigger size): The second one has been written 3.97 GB as follows: The third one has been written 2.44 GB as follows: I am allowed only one time to create recovery disk. So I cannot try again. So I was wondering if I missed something? How is the creation process supposed to be like? Thanks and regards!

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• How do I use LibreOffice's 3d transitions in Impress?

  - by Lvkz

  How can I get the 3D transitions working on Impress? I got a presentation coming soon, and as a requirement of the course the professor want us to use transitions on our "Power Point" chapter, obviously I have been using LibreOffice in every exercise but the native transitions are kind of lame, so when I install the newer version of Ubuntu, always install the extra package to the transitions - I had installed the 3D package: libreoffice-ogltrans 1:3.4.3-3ubuntu2 In previous versions of Ubuntu and worked perfectly, but for some reason is not working in this release. I got LibreOffice 3.4.3, Ubuntu Oneiric Ocelot (11.10) and my hardware is not relevant because I had it working before on previous releases. I know is not critical, but for my class is a pretty important deal, and can be a perfect opportunity to show the class that the cool stuff are not only in Windows. As a recomendation of one of Eliah Kagan, I'm putting the output of: sudo lshw -C video *-display:0 description: VGA compatible controller product: Mobile 4 Series Chipset Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 07 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:46 memory:f6c00000-f6ffffff memory:e0000000-efffffff ioport:efe8(size=8) *-display:1 UNCLAIMED description: Display controller product: Mobile 4 Series Chipset Integrated Graphics Controller vendor: Intel Corporation physical id: 2.1 bus info: pci@0000:00:02.1 version: 07 width: 64 bits clock: 33MHz capabilities: pm bus_master cap_list configuration: latency=0 resources: memory:f6b00000-f6bfffff And I'm not using Unity - it don't there anyways -, I'm using instead Gnome Shell.

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• Is there a way to increase how much is cached for thumbnail views of pictures?

  - by JimDel

  Is there a way to increase how much is cached for thumbnail views of pictures? If I'm looking through a folder of .png files for example, with "medium" set as the view size. The screen will eventually fill all the thumbnails with the appropriate pictures. But as I scroll down it takes a while for the pictures to fill in again. I would like a way for "off screen" pictures to fill in before I get the that section of the screen. Is there a way to do this? Thanks

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• btrfs and missing free space

  - by easteregg

  I converted my ext4 partition to btrfs and deleted the save subvolume after doing so. Then I enabled the compression (lzo) of the filessystem in the fstab file and everything is correct so far. Then I forced the compression of all files using the defragmentation command with the parameter -c that the new compression is applied to all files. While doing so, I noticed that my ssd got completly filled up - before I had 6gigs of free space. No I got nothing left. easteregg@x201s:~$ btrfs fi df / Data: total=50.00GB, used=49.17GB System: total=32.00MB, used=4.00KB Metadata: total=24.50GB, used=9.86GB and easteregg@x201s:~$ df -ha Filesystem Size Used Avail Use% Mounted on /dev/sda1 75G 60G 852M 99% / So now. How can I regain my free space. I expected to gain more space because of the lzo compression. And now! The fs is correctly mounted. easteregg@x201s:~$ mount /dev/sda1 on / type btrfs (rw,noatime,ssd,compress=lzo) Any ideas how to fix this issue?

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• $DISPLAY dependent gtk themes

  - by Vlad Seghete

  I have a computer at home that I log into remotely. The "monitor" for it is a TV, so I want gtk applications to use a large font and icon theme, which I managed to do by editing the ~/.gtkrc-2.0 file and some other similar stuff. What I want to be able to do is have a separate theme for when I'm logging in remotely. The best way to explain is that I would like my gtk theme choice to be dependent on the X display that the application is started on. For example, if I start something on :0.0 then that is the TV and I want large fonts, but if I start it on localhost:10.0 I want to use a regular size font, because it will get rendered on my laptop screen. The elegant solution would be to have some sort of IF statement in the .gtkrc-2.0 file that checks the $DISPLAY variable and behaves accordingly. The problem is I can't find any documentation on control structures in .gktrc files, or if it's even possible to do that.

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• Hadoop Rolling Small files

  - by Arenstar

  I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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• How to recover missing folders in a Windows-Ubuntu dual-boot system?

  - by UnhappyGhost

  I have Windows 7 and Ubuntu 12.04 as dual-boot and on the same 500GB HDD. I have partitioned the drive into NTFS file system from Windows before I installed Edubuntu 12.04 in the remaining free space. Now, there is a drive(G:) accessible through Windows and has few folders. I boot into Edubuntu and create a folder "LinTor" and download movies and few software from torrentz. Before I download, it showed 49GB free out of 62GB. After all the downloads it showed 31GB free out of 62GB. Then I boot into Windows and I couldn't find this "LinTor" folder. I wondered that might be happening as I hibernate Edubuntu (using sudo pm-hibernate) and then boot into Windows. I then create another folder in the same drive(G:) with the name "001" to check if this was accessible from Edubuntu. Now I reboot into Edubuntu to find that "LinTor" folder has disappeared and "001" folder wasn't showing up either. Surprisingly, the drive size still shows 31GB free out of 62GB but when I check it from Windows, it shows 49GB free of 62GB. There is one thing I would like to mention. When I was trying to unmount the NTFS drive(G:) from Edubuntu before booting into Windows, it prompted me with this message: Do you want to empty the trash before you unmount the drive? Once the trash is emptied the data is permanently deleted and cannot be recovered. Please help me understand what could be the problem and how do I recover the missing folder?

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• Email server - Disk quota sizes - suggestions?

  - by Ian H

  Working out a new server for an agency of 200 Employees - with approx 240 email accounts. Internally I'm arguing with myself over the amount of drive space to allocate to each user for the disk quota, I'm just looking for suggestions. Once i have a quota size decided, it will define the solution for storage. I've had everything from 4 GB per account ( which i feel is being generous ) down to 500 Mb ( with is rather restrictive in today's day and age. ) Thing is 4 GB per acocunt is just under 1 TB of allocated storage for email alone. Does anyone follow a "rule of thumb" or have thoughts on this? thanks in advance

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• Maximum hard drive space for an Xserve G5

  - by wjlafrance

  At my college we're upgrading an Xserve G5 (RackMac3,1) to be a file server for some courses. Currently it has one sled with a 75GB drive. Obviously, this isn't enough. I've tried some Googling on this matter and I'm hearing a ton of different stuff - custom firmware, size issues, etc. So, for anyone who knows, what's the actual lowdown on this machine. We want to put in three 2TB drives using three standard sleds, replaced with third-party drives. Is this possible?

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• Strange Phantom Local Disks appearing in my drive list...

  - by Paul

  Win7 Home Prem 32 bit I seem to have several phantom Local Disks mapped to different letters, they are of 0 bytes in size? Strangely they do not show up when i view my drives through windows explorer but if i open an application such as ACDSee Pro or MS Word and then go to open a file i can see all these Local Disks mapped to different letters. This means when i plug in my external hard disk it ends up mapped to letter R instead of its usual G which messes up any programs i have pointing to it by default. How did they get there and more importantly how do i get rid of them please??

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• CUDA 4.1 Update

  - by N0xus

  I'm currently working on porting a particle system to update on the GPU via the use of CUDA. With CUDA, I've already passed over the required data I need to the GPU and allocated and copied the date via the host. When I build the project, it all runs fine, but when I run it, the project says I need to allocate my h_position pointer. This pointer is my host pointer and is meant to hold the data. I know I need to pass in the current particle position to the required cudaMemcpy call and they are currently stored in a list with a for loop being created and interated for each particle calling the following line of code: m_particleList[i].positionY = m_particleList[i].positionY - (m_particleList[i].velocity * frameTime * 0.001f); My current host side cuda code looks like this: float* h_position; // Your host pointer. This holds the data (I assume it's already filled with the data.) float* d_position; // Your device pointer, we will allocate and fill this float* d_velocity; float* d_time; int threads_per_block = 128; // You should play with this value int blocks = m_maxParticles/threads_per_block + ( (m_maxParticles%threads_per_block)?1:0 ); const int N = 10; size_t size = N * sizeof(float); cudaMalloc( (void**)&d_position, m_maxParticles * sizeof(float) ); cudaMemcpy( d_position, h_position, m_maxParticles * sizeof(float), cudaMemcpyHostToDevice); Both of which were / can be found inside my UpdateParticle() method. I had originally thought it would be a simple case of changing the h_position variable in the cudaMemcpy to m_particleList[i] but then I get the following error: no suitable conversion function from "ParticleSystemClass::ParticleType" to "const void *" exists I've probably messed up somewhere, but could someone please help fix the issues I'm facing. Everything else seems to running fine, it's just when I try to run the program that certain things hit the fan.

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• Audio not working in 12.10

  - by frampy

  I did a clean install of 12.10, when I open Sound Settings in gnome the only device in the list is "Dummy Output", and sound is not working. Sound worked fine out of the box in 12.04 I ran alsamixer, it says my card is "HDA Intel", and chip is "Realtek ALC880". The alsamixer playback output was set to mute at first, unmuting did not fix. I checked out the info at http://www.unixmen.com/2012003-howto-resolve-nosound-problem-on-ubuntu/ as suggested on a similar question, I've done everything there except installing the ubuntu audio dev team driver. Should I try install this? Edit: I've been reading the sound troubleshooting guide at https://help.ubuntu.com/community/SoundTroubleshooting It looks like Ubuntu is finding my audio device correctly. mike@wucade:~$ lspci -v | grep -A7 -i "audio" 00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 03) Subsystem: Albatron Corp. Device 2668 Flags: bus master, fast devsel, latency 0, IRQ 40 Memory at d01c0000 (64-bit, non-prefetchable) [size=16K] Capabilities: Kernel driver in use: snd_hda_intel Kernel modules: snd-hda-intel Still stuck as to why this isn't working.

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• Ubuntu 14.04 LTS 64-bit install alongside Windows 7

  - by user289222

  I've tried installing Ubuntu 14.04 LTS alongside my Windows 7 OS, following the exact procedure given by the Ubuntu website and random other tutorials. I've tried with a LiveCD and with a USB stick but I always run into the same problem. When I'm at the screen where I'm allowed to select how I want to install Ubuntu ("alongside", "erase Windows 7", "something else"), the first option says "Install Ubuntu inside Windows 7" instead of "Install Ubuntu alongside Windows 7". From pretty much all tutorials I've seen, the tutorial says that the option should say "alongside". I click "inside" anyway, and Ubuntu doesn't install at all. Instead, my computer just reboots, and goes back to the Try Ubuntu or Install Now screen. This happens regardless of using a LiveCD or a USB stick. I've also tried manually resizing my partitions using "something else". Oddly, I see 4 sda partitions: /dev/sda type size used /dev/sda1 1mb unknown Windows 7 (loader) /dev/sda2 ntsf 208mb unknown Recovery Windows Environment (loader) /dev/sda3 ntsf ~752000mb unknown Recovery Windows Environment (loader) /dev/sda4 ~18000mb unknown I try resizing the largest partition, but some sort of internal error occurs and it doesn't let me resize my partitions. Any ideas on what's going on and how to solve it?

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• Approaches for a clickable map of nations (such as a Risk game) with Spritekit

  - by Vukovitch

  I would like to create a political map where each country is clickable by tapping but I'm not sure the best way to determine which nation was selected. Imagine Risk where each country can be individually clicked to bring up additional information. My current approach is to make a sprite for each nation where every image is the size of the screen The images are mostly transparent except for the country, that way when all of the images are displayed the countries are in the correct place relative to one another. To determine if a click occurs on an individual country I look to see if the tapped location is a non transparent pixel and check that the sprite's name is one of the countries. Additionally the nation needs to glow or something when tapped as an indicator, however my current solution is yet another sprite that is displayed. This seems like a terrible approach and I was wondering what other solutions might achieve the same results. I'm pretty new to SpriteKit so I'm not entirely sure. The other idea I had was creating a single texture where each country is a different shade of gray, then when I get the tap location I do a lookup on the color at that location and get the corresponding country. However, I'm not sure how to create a hilight or glowing country effect with that method.

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