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• Fourier transform software

  - by CFP

  Hello everyone! After spending a lot of time searching for this, I thought that some SuperUser gurus might know the answer :) I'm searching for an open source application to compute an FFT, that could: * Import a list of points from a text file (in any format, I could write conversion scripts if needed), for example 0,1; 1,2; 4,5 * Compute the associated discrete transform, and output the list of coefficients Ideally, it would also display the plot and the associated fourier decomposition on the same graph, to allow comparison, but this is not absolutely needed. It can be either on Windows or on Linux/Unix. Can you think of a solution? Thanks, CFP.

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• OpenVZ vs Xen, how much difference in performance?

  - by Aleksandr Levchuk

  There is a Xen vs. KVM in performance question on ServerFault. What will be the performance difference if the choice is between Xen and OpenVZ? How is it best to measure? Some may say "you're comparing apples and oranges" but I have to choose one of the two and it needs to be wise choice. Performance is most important to us. We may switching to Xen from OpenVZ because Xen is more ubiquitous but only if performance difference is not significant. In January 2011 I'm thinking of doing a head to head performance comparison - here is my project proposal to our Bioinformatics facility director.

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• NVIDIA same chipset, but different implementations - what is the difference?

  - by Horst Walter

  I have planned to buy a graphics card. When searching for a particular chipset (e.g. GTX 460) I find cards of different vendors (i.e. Gigabyte, Palit, PNY, ...). I can figure out differences in frequency, memory, and equipment. When I read test reports, usually a particular NVIDIA card is compared with its ATI/AMD "counterpart" - have not really found a comparison of all vendors for a particular NVIDIA chipset. So in order to make a decision: a) Are the drivers all the same for all the cards of a particular chipset (and provided by NVIDIA or the vendor?) b) How to figure out which card actually to buy. OK, I choose chipset, and memory, and check the card has the required ports, but then ....

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• .vob to h.264 MP4 Files - Worth The Effort?

  - by harper89

  When I was doing the converting to digital format a while back I chose .VOB due to no quality loss. However recently I have been informed of this h.264 compression method. Time is not an issue here, I don't mind waiting for conversions etc. I also understand that any sort of compression will reduce quality. To test I converted a 4GB .VOB to a .mp4 using h264 in handbrake and the quality loss was very very very hard to notice. From what I have understood through research Space = .mp4(h.264) Quality = .Vob Playback = Both equally supported? But these concerns have yet to be answered: My comparison was done on a computer monitor, would the quality loss be substantially noticable if I purchased a 50 inch TV in the future? Is this type of file highly supported? (I don't want to experience incompatible players) What other issues could a conversion of files such as this cause in the future?

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• 802.11n Audio Interference

  - by colithium

  Symptoms My audio is riddled with pops/crackles/glitches. Sometimes I swear the glitches sound exactly like the facebook messenger sound (best comparison I can give). Cause Using DPC Latency Checker, it reports the latency to be an abysmal 17,500µs (0.0175s). The first thing I did was disable my 802.11n wireless adapter. This immediately dropped the latency to a nice 250µs. When I re-enabled the adapter, it jumped right back up. I'm 99% certain that this is the cause of my audio glitches. Solution What can I do about it besides using wired Ethernet or buying a whole new adapter? My adapter is a Dell Wireless 1505 Draft 802.11n WLAN Mini-Card. To be honest, I've had nothing but trouble with the 802.11n standard and am contemplating just going back to g.

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• Make favorites always visible in Windows Explorer

  - by gix

  Vista introduced the favorites in the navigation pane of Windows Explorer. In Windows 7 I immediately noticed that the favorites don't have a separate pane at the top anymore. See this image for a comparison. So to access the favorites (which I do a lot, I love that feature!) I always have to scroll to the top first which is quite annoying. Is there any way to restore the old behavior? I can't believe that they went a step backwards here.

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• Should I use my ISP's DNS, or Google's 8.8.8.8?

  - by Torben Gundtofte-Bruun

  It seems like a good idea to use Google's public DNS 8.8.8.8 and 8.8.4.4 because it's really fast -- much faster than my own ISP's DNS! -- and probably more reliable, too. That seems like a ridiculously quick win for me, and much easier to remember. Assuming we're not all "tin foil hat" about Google, why shouldn't everybody use Google DNS? Note: I've seen this question, but I don't want a comparison to OpenDNS. This is about everyday use by everyday people in their homes. Update: I seem to have put my hand in a wasps' nest of privacy concerns. I appreciate the issue, but I was expecting a more technology-oriented discussion...

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• Virtual NIC on VM couldn't ping externally after Vmotion

  - by ToreTrygg

  Today I vmotioned 5 MS SQL 2005 servers over to a new DRS Cluster. All SQL servers use the "Production_LAN" network and a single virtual NIC of type "VMXNET 3". The first 4 SQL VM (Windows 2003 Standard or Enterprise x32 bit) vmotioned over without a hitch. The last SQL VM I vmotioned (Windows 2003 Standard x64 bit R2) vmotioned over without error, but I upon completion, I could no longer ping the VM. I went into the VM and could not even ping the gateway, however I could ping the loopback. This SQL server is extremely busy in comparison with the previous 4 VM's. I restarted the server and it came back up with the virtual nic working just fine. The build of both servers (vmotioner and vmotionee) is ESX 4.0.0 175625 - So, pre-update 1. Should I suspect the network switch/VM for possibly not updating the mac table on the switch? Anybody else ever have this issue or know what may have caused it? Thank you!

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• A website to compare software/hardware/electronics?

  - by liori

  Hello, When choosing software or hardware I often Wikipedia's comparision pages like the page on Comparison of project management software. However, criteria on including items on such lists are sometimes unclear (f.e. project has to be "notable", has to have a Wikipedia page), and the number of compared features are limited. Also, Wikipedia's software doesn't make it easy to edit such lists. I am looking for an external webapp/website that would do the task of comparing different solutions in the world of software, hardware, maybe even electronics, in this kind of social way. Is there any kind of such service? It should allow users to add new entries, add new features to compare and discuss items in a collaborative way. It should be also easy to browse already entered items, filter by features. (this might be a good idea for a startup ;-))

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• Can you play Halo 2 and Halo 3 on an Xbox360 Arcade?

  - by Jeremy Rudd

  I'm looking at purchasing a Xbox360 because I've wanted to catch up with the Halo trilogy. Does the cheap Arcade edition console support Halo 2 and Halo 3? Would I be able to save my game progress in single player? Would I be able to play online in typical maps? Would I be able to play games using the DVD drive or do I have to download everything? Does the tiny HDD hurt even if I don't download any games, trailers or music? Are there any other differences in comparison to the Xbox360 Pro? I have a regular TV that uses the composite cable, so I don't need the HDTV support in the Pro edition.

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• What's the difference between these Asus socket 1155 motherboards?

  - by Johnny W

  I've looked on Asus's website, but they don't make it easy to understand what the differences are, and there's so many models to choose from! It's all spiel, and endless specs. How is anybody supposed to rifle through so much detail in order to make note of minor differences? If anyone already has this knowledge, I'd love to know what the major differences between these Z77 models are: P8Z77-V P8Z77-V DELUXE P8Z77-V LE P8Z77-V LE PLUS P8Z77-V LK P8Z77-V LX P8Z77-V PREMIUM P8Z77-V PRO P8Z77-V PRO/THUNDERBOLT Asus are famous for offering lots of solutions, but if there's no easy way to see the differences, how can you even consider what to buy? Their website does include a Comparison tool, but it's broken: I'm primarily interested in 1, 3, 4, 5 and 6, if that makes the task any easier. I'm sure there are people who have this knowledge. Thanks for any help.

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• How can I create and add a new slide type to the New Slide menu in PowerPoint?

  - by ObligatoryMoniker

  On the Home ribbon in Power Point 2007 there is a new slide button with an arrow that shows you various types of slides that you can add to your presentation: Title Slide, Title and Content, Comparison, Title Only, etc. I want to design a new type of slide that has 4 content areas instead of two and then be able to add new slides of this type using the new slide menu. I know that I can add new Power Point templates but that would require me to start a new presentation with my custom slide type in it and the copy and paste that slide into the current presentation that I am already working on. How can I create a new slide type and then add it to the menu so that I can quickly create new slides of my new 4 content area slide type?

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• Solaris to Linux conversion: Use VxFS or GFS?

  - by w00t

  We're a Solaris shop looking at RedHat Enterprise Linux and one of the things we're wondering is if we should keep Veritas Volume Manager + FileSystem or go with LVM+ext3 or RedHat's preferred cluster filesystem solution, GFS. One of the things we like about Veritas is that it can use Veritas Volume Replicator to have a remote copy of important filesystems. This functionality seems to be missing from RedHat, DRBD doesn't seem to be packaged in RHEL... So my questions are: Does anybody use VxFS/VxVM/VVR on Linux? Thoughts, experiences? Comparison with LVM+ext3? Anybody using GFS? Thoughts, experiences? Do you do remote replication for disaster recovery, and if so, how? Is there a standard RedHat way?

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• Strange scaling when duplicating monitors with another screen

  - by Aerione

  I can't get two monitors to scale application resolutions the same way. My main monitor works normally. My second monitor however, which is set to duplicate its image onto a TV I have in my room, renders the applications in a far lower resolution than the 1080p I've set it to. Also, the mouse pointer on the second monitor is enormous, it looks 2-3 times bigger than the one on the main monitor. I've checked the "Let me choose one scaling level for all my displays", to no avail. Here are some comparison pictures. Metro on the main monitor: Metro on monitor 2 (set to 1080p and to duplicate on a TV): This issue only seem to arise when I duplicate the monitor onto the TV. Does anyone have any idea of how to solve this?

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• Connectors for Sharepoint Federated Search

  - by TobyEvans

  Hi there, we're setting up Federated Search on our intranet, and this blog: http://blogs.blackmarble.co.uk/blogs/adawson/archive/2008/08/01/sharepoint-federated-search.aspx indicates that there is an on-line gallery for searching other external sources, eg Yahoo The link for the gallery is: http://go.microsoft.com/fwlink/?LinkID=95798, which initally led to: http://www.microsoft.com/enterprisesearch/en/us/search-connectors.aspx but which now gets redirected to: http://sharepoint.microsoft.com/en-us/buy/Pages/Editions-Comparison.aspx?Capability=Search which isn't what I was looking for at all ... Does anybody know what's happened here/let us have a nice Yahoo connector? thanks Toby

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• Firefox 4 is displaying all text as "bold"

  - by Mateo

  I installed Firefox 4 this morning excited to checkout some of the new HTML 5 features that have been implemented and found that all text was displayed in a bold font. Here is the comparison with what Firefox 4 is displaying on my machine and Chrome. It is getting really annoying. So far I've... Emptied the cache/history/etc. Re-installed the various core fonts (Arial, Courier, Times New Roman, etc.) Checked the font defaults in FF4. The interesting part to me is that I had FF3.6x on this machine with no problems whatsoever and now this. Any ideas? System Description Windows 7 (x64) Update I just found out that this is happening in IE9 (final) as well. Must be something with the system fonts. Like I said before, this wasn't happening pre-FF4.

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• What are the quality metrics for RAM?

  - by Hi-Tech KitKat Android

  I have searched RAM and i found there are given some specification for the same capacity RAM, What are the difference and performance comparison between these? Like RAM1 General Brand Transcend Memory Type 2 GB (8 x 128 MB) DDR2 DIMM Memory Standard DDR2-800/PC-6400 Compatible Device PC Pins 240-pin Burst Length 4, 8 Buffered/Unbuffered Unbuffered Memory Memory Clock 400 MHz Technology DDR2 SDRAM Memory CAS Latency 4, 5, 6 RAM 2 General Brand Transcend Memory Type 2 GB (8 x 128 MB) DDR2 DIMM Memory Standard DDR2-667/PC2-5300 Compatible Device PC Pins 240-pin Burst Length 4, 8 Buffered/Unbuffered Unbuffered Memory Memory Clock 333 MHz Technology DDR2 SDRAM Memory CAS Latency 3, 4, 5 RAM3 General Brand Kingston Memory Type 2 GB (64 x 256 MB) 800 MHz DDR2 DIMM Compatible Device PC Pins 240-pin Error Check Non-ECC Buffered/Unbuffered Unbuffered Memory Memory Clock 200 MHz Technology DDR2 SDRAM Memory CAS Latency 6 What are the affect of the following Memory Type(given as 8 x 128 MB) Memory Clock (given in MHz) CAS Latency (given as 4,5,6) my Requirement is 2 GB DDR2 Type Desktop Please help

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• AWS Elastic load balancer doesn't decrease instances from Alarm Trigger

  - by jchysk

  I have a load balancer that I created an auto-scaling-group and launch-config for. I created the auto-scaling-group with a min-size of 1 and max size of 20. I have a scaledown policy: as-put-scaling-policy SBMScaleDownPolicy --auto-scaling-group SBMAutoScaleGroup --adjustment=-1 --type ChangeInCapacity --cooldown 300 Then I set up an alarm: mon-put-metric-alarm SBMLowCPUAlarm --comparison-operator LessThanThreshold --evaluation-periods 1 --metric-name CPUUtilization --namespace "AWS/EC2" --period 600 --statistic Average --threshold 35 --alarm-actions arn:aws:autoscaling:us-east-1:policystuffhere:autoScalingGroupName/SBMAutoScaleGroup:policyName/SBMScaleDownPolicy --dimensions "AutoScalingGroupName=SBMAutoScaleGroup" When average CPU usage over 10 minutes is under 35, in CloudFront the alarm shows up as "In Alarm State" but doesn't decrease the number of instances. Also, if there's only one instance running it'll spin up another to 2 even if a scale up alarm isn't hit. It seems like the default value is just set to 2 somehow. How can I change this?

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• Any opinions on Paragon's NTFS for Mac solution?

  - by AngryHacker

  I am currently using the free NTFS-3G to access my NTFS drive from the Mac. It seems pretty stable (except once in the very beginning, it locked up the Mac and corrupted my NTFS drive, which I then fixed with chkdsk from a PC). However, speed is NOT one of its virtues. I've been looking at buying Paragon NTFS for Mac OS X 7.0. Their product comparison PDF claims nearly double the speed (vs NTFS-3G) in almost every category (read, write, etc...). Can someone tell me whether the product is stable and whether the speed claims are true.

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• Linux compilers for C/C++ on AMD "Bulldozer" CPUs like the Interlagos [closed]

  - by jstarek

  I am looking for a Linux compiler for C/C++ code that supports AMDs new "Bulldozer" architecture and produces efficient binaries for the Interlagos series Opterons. This seems to be a bit difficult because of the peculiarities of the Bulldozer microarchitecture. While AMD has a whitepaper with some details, I would like to see some independent analyses. The relevant paper from HeCToR focuses mostly on job placement and scheduling, which is an area we already investigate. So, who can recommend a good compiler comparison for Bulldozers running Linux? Does anyone have well-described benchmarks?

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• Is there a smarter Find files utility for Windows 8 than Windows key + F?

  - by Clay Shannon

  Is there any utility for Windows 8 that will basically do the same thing the old "Find" dialog in Explorer did? Often times (many times a day) I need to find a particular file, and I don't know the name of it or where it is, but I can remember a phrase in it, and approximately when it was written, e.g., it has the phrase "Duckbilled Platypus" in it and was written sometime in the last week. The Find Files functionality in Windows 8 is lame by comparison; I know there are probably geeky ways to jump through hoops and do it, but I don't want to have to write GREP expressions, I want something easy like the old functionality...

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• Why is my DB read-only when attached to SQL Express, but not with SQL Web?

  - by David Rubin

  I have an .mdf/.ldf pair, originally created in 2008 R2 Standard, and well under 10GB, with ACLs: d:\db snapshot\DB_NAME.mdf SERVERNAME\SQLServerMSSQLUser$ACCOUNT$MSSQLSERVER:F OWNER RIGHTS:F BUILTIN\Administrators:F d:\db snapshot\DB_NAME_log.ldf SERVERNAME\SQLServerMSSQLUser$ACCOUNT$MSSQLSERVER:F OWNER RIGHTS:F BUILTIN\Administrators:F When I attach the database to an instance of SQL Express 2008 R2, it comes up as read-only. When exactly the same acls and user-accounts and SQLCMD statements are set up with SQL Web 2008 R2, it comes up writable. I looked at MSDN's comparison page but nothing jumped out at me. Why on earth is this happening? Thanks! UPDATE I just noticed that the name of the attached databases are different. On SQL Express (read-only) it matches the filename (e.g. DB_NAME); on SQL Web (writable) it matches the CUSTOM_NAME that I gave it in the attach command: CREATE DATABASE [CUSTOM_NAME] ON (FILENAME = 'PATH_TO_MDF'), (FILENAME = 'PATH_TO_LDF') FOR ATTACH

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• How much RAM on a windows VPS (2003, 2008, 2008R2)

  - by Pietro

  Right now I'm running Windows Server 2003 on a VPS with 640mb RAM and it works fine. I would like to upgrade OS to Windows Web Server 2008 or Windows Web Server 2008 R2. I understand that it is difficult to say how much RAM is needed, but can you make a comparison between 2003 and the two new 2008 versions? RAM on VPS is by far the most expensive item, so I wonder if I can get similar performances with 1GB and 2008 or 2008R2 compared to 640MB and 2003. Basically I run IIS, SQL Server and MailEnable.

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• Debian is equal to Ubuntu

  - by rkmax

  The title of the question is confusing, and does not explain my point well. I've always used Ubuntu server from version 10.04 and never had problem, now I have 4 machines with ubuntu 12.04.1 LTS installed on them and I found that under any circumstances where there is a high burden throws me a problem and machine crashes constantly. the most common is CPU#X stuck for Ns! Now I wonder if the administration of Debian is equal to that of ubuntu, regarding Servicos, packages, folders structure for example I would like to know if the services are installed in the same manner using invoke-rc.d, which handles additional security, including for not giving blind caning. I've been looking for a comparison chart but have not found anything yet, something between Debian 6.0.6 and Ubuntu 12.04 also the most common "hiccups" when you install the system

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• Why is my iPhone WIFI so slow at home?

  - by John Fouhy

  When my iPhone is connected to my home wireless network, the internet is unusably slow. I installed the speedtest.net application; here are some results from tonight: Down: 0.0kB/s, Up: 0.0kB/s, ping: 2230ms Down: 2.5kB/s, Up: 40.5kB/s, ping: 2182ms Down: 0.0kB/s, Up: 20.0kB/s, ping: 197ms For comparison, here is the result from my iMac to the same server, which is on the same wireless network (and has no wired connection): Down: 139kB/s, Up: 53.8kB/s, ping: 182ms Neither my iMac nor the Dell laptop also on the network have experienced the wifi problems I get with my iPhone. On the other hand, I tried browsing a website on the wireless network at work with no problems. EDIT: SpeedTest at work gives me 156kB/s down. EDIT2: Girlfriend (owner of the Dell) reports actually the internet is sometimes very slow. Perhaps there is more going on. No problems with my iMac. My router is a ASUS WL-500g Premium V2 running OpenWrt Kamikaze with X-Wrt Extensions 8.09.

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