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• Notebook with NVIDIA Optimus not switching video card in games

  - by user140739

  I have a Samsung RC720 notebook with Intel Integrated Graphics and NVIDIA GeForce GT 520M. As you can see it has two video adapters and Optimus is supposed to switch between them. But when I choose dedicated GPU in NVIDIA Control Panel and try to run, for example, GTA IV, it uses integrated graphics and I get very poor performance. I have already installed last NVIDIA and notebook drivers, chose high-performance in NVIDIA Control Panel, tried to execute with "Run with graphics processor..." context option and so on. Thanks for help.

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• Is there a performance pentalty using in-place models/families in a large Revit project

  - by Jaips

  (I'm quite new at Revit so apologies if my concepts are a bit inaccurate) I have heard using, in-place models in Revit projects is poor practice since it can slow down a large project. However i noticed Revit also organising inplace models lumping them with the rest of the families. So my question is: Is there really any performance penalty/benefit to be had by inserting families from an external file as opposed to creating inplace models in a Revit project?

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• Puzzling TCP performance over 3G / UMTS

  - by lemonsqueeze

  I'm using 3G as my primary internet connection, and TCP over this thing is getting more puzzling every day. For example: Downloading from kernel.org is crazy fast: $wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.6.8.tar.bz2 increases to ~500kB/s after a few secs ! Some servers are incredibly slow, for instance www.graphic-pc.com:Same thing, downloading a big file with wget it starts at ~30kB/s for a split second, then collapses to 5-10k or even worse. Web browsing is decent but somewhat unreliable. Randomly, a page will take really long to load or even fail to load, but a reload can succeed almost immediately. Now, by chance i started playing with OpenVPN over UDP on top of the 3G connection, and OMG suddenly everything's extremely fast !Same www.graphic-pc.com now shoots at 100-200kB/s ! What's going on here ??? How come it is so much better with the VPN than without ?? And why does graphic-pc.com crawl when kernel.org flies ?Something to do with my tcp stack (or the server), or some buggy router in between ?? Notes: Setup is laptop running Ubuntu Lucid and a Huawei 3G dongle (So direct pppd connection). I can reproduce this pretty much any time during the day and I'm not moving, so it's clearly not cell environment or internet congestion. (although kernel.org without VPN sometimes does worse in the evening, 60kB or so - but still 500kB with VPN !) For 2) wireshark shows retransmitted packets, dup ack's, even out of order sometimes. I've tried playing with different /proc/sys/net/ipv4 parameters (tcp_rmem, window_scaling, tcp_congestion...) doesn't seem to make a difference. Update: Tried under windows 7 (no VPN) with some interesting results: tcp settings : default tcp_optimizer kernel.org : 10 kB/s 20 kB/s graphic-pc.com: 8 kB/s 70 kB/s ! tcp_optimizer turned on ctcp among other things. Have to check what os graphic-pc.com is running, my bet is linux's tcp_westwood and ms ctcp don't mix well here...

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• CentOS 6.5 x64 + Ajendi +nginx + php-fpm + mysql setup unable to load the PHP page

  - by Francis

  I'm using Ajendi to setup a PHP web server, I can load the PHP info page, when I try to load the PHP copy from other server, I get a blank page with this log appear on access log, I have no clue what was wrong and troubleshoot further, please advice. x.x.x.x - - [28/May/2014:10:08:37 -0400] "GET /index.php HTTP/1.1" 200 31 "-" "Mozilla/5.0 (Windows NT 6.1; rv:29.0) Gecko/20100101 Firefox/29.0" 2.6.32-431.1.2.0.1.el6.x86_64 cat /etc/redhat-release CentOS release 6.5 (Final) The vhost config AUTOMATICALLY GENERATED - DO NO EDIT! server { listen *:80; server_name test.com www.test.com; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; root /www; index index.html index.htm index.php; location ~ \.php$ { alias /www; fastcgi_index index.php; include fcgi.conf; fastcgi_pass unix:/var/run/php-fcgi-php-fcgi-0.sock; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } }

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• Is (Ubuntu) Linux file copying algorithm better than Windows 7?

  - by Sarath

  Windows Copying is a real mess ever since Windows Vista. Even Microsoft claims they've improved the performance, from a user perspective, it's not quite visible. Even with single file the copying window appears too much time for 'Calculating' and then finishing the copy(Even after 100% completion some times the dialog remains active). At the same time, I was backing up some files in Ubuntu Linux. I felt it's really fast. Might be a feeling caused by faster UI updates. I read an informative post from Jeff Atwood few years back on Windows File Copying. but what my specific questions are Is (Ubuntu) Linux file performance is better than Windows-7? Are both algorithms, Windows and Linux is making use of multiple threads and pipelining mechanism to improve the speed? If yes, which one is better?

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• i5+SSD or i7+HDD gives better performance [closed]

  - by Cas Sakal

  Which performs better for developers on a notebook(running VS.NET, SQL Server, no gaming); (A) i5 540M + SSD (Intel) or (B) i7 720M + 7200 RPM HDD (Western Digital) In short, I want to ask whether the performance difference between i5 540M and i7 720M can be compensated via using solid state drive instead of using a hard drive? Thank you, cas

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• Scaling a LAMP website hosted on EC2

  - by Gublooo

  Hello, I'm very new to all this - I've recently managed to launch my website on EC2. As next step, I want to learn how to scale the website. I have a general idea but wanted some input from the experts about how to go about it. My website is based on LAMP but also has Red5 server which allows users to record messages and also used for playing them back. Currently this is the architecture I'm planning to setup for initial scaling. Deploy four small EC2 instances for the following purposes: Instance-1: On this instance I will run the MySql database Instance-2: On this instance I will run the red5 server Instance-3 & Instance-4 These 2 instances will be used to deploy the website and will have Apache running on them. They will communicate with the mysql server on Instance-1 and red5 server on Instance-2 using the internal IP address. As an when required, I will launch another instance of the same EBS - I will have EBS of say 50 GIG where all the mysql data will be stored. Also red5 will use this EBS to store the video messages Load-Balancer - Use the load balancer provided by Amazon to load balance Instance-3 and Instance-4 This is what I have in mind. I could be way off so please bear with me. Also I have not taken into account the case of scaling MySql server as I currently have no idea about how that will be done and whether or not it is necessary initially. I am aware that Amazon provides auto scaling and mysql scaling as well but I dont want to get into that right now. Your feedback is appreciated Thanks

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• What would cause a query being ran from SSMS on local box to run slower then from remote box

  - by Racter

  When I run a simply query such as "Select Column1, Column2 from Table A" from within SSMS running on my production SQL Server the results seems to take extremely long (45Min). If I run the same query from my dev system’s SSMS connecting to the production SQL Server the results return within a few seconds (<60sec). One thing I have notices is if the system was just rebooted performance is good for a bit. It is hard to determine a time as I have had it start running slow very quickly after reboot but at most it performed good for 20min and then start acting up. Also, just restarting the SQL service does not resolve the issue or provide a temporary performance boost. Specs for Server are: Windows Server 2003, Enterprise Edition, SP2 4 X Intel Xeon 3.6GHz - 6GB System Memory Active/Active Cluster SQL Server 2005 SP2 (9.0.3239)

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• laptop and it drastically reduces the performance of my machine as the Indexer is constantly running

  - by Sakthy

  I get the below error on my laptop and it drastically reduces the performance of my machine as the Indexer is constantly running. Please identify a solution except re-installation ? Faulting application name: SearchIndexer.exe, version: 7.0.7600.16385, time stamp: 0x4a5bcdd0 Faulting module name: TQUERY.DLL, version: 7.0.7600.16385, time stamp: 0x4a5bdb21 Exception code: 0xc0000006 Fault offset: 0x0002e5c2 Faulting process id: 0xbe0 Faulting application start time: 0x01cd0752bd78cce1 Faulting application path: C:\Windows\system32\SearchIndexer.exe Faulting module path: C:\Windows\system32\TQUERY.DLL Report Id: 16ce8a2f-7346-11e1-840a-a92a5ee507c3 EventID: 1000

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• Does a USB hub affect performance?

  - by user1018733

  I have two devices I want maximum throughput and latency with. (Midi drums and midi keyboard for example) Would connecting both to the same USB port via a hub effectively limit the maximum data transfer rate to 1/2 to each of them? I am assuming yes, but I didn't know if USB hubs had a handshaking and priority giving protocol available (e.g. let the device with the longer built up buffer of data communicate first) Thanks

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• How to store data on a machine whose power gets cut at random

  - by Sevas

  I have a virtual machine (Debian) running on a physical machine host. The virtual machine acts as a buffer for data that it frequently receives over the local network (the period for this data is 0.5s, so a fairly high throughput). Any data received is stored on the virtual machine and repeatedly forwarded to an external server over UDP. Once the external server acknowledges (over UDP) that it has received a data packet, the original data is deleted from the virtual machine and not sent to the external server again. The internet connection that connects the VM and the external server is unreliable, meaning it could be down for days at a time. The physical machine that hosts the VM gets its power cut several times per day at random. There is no way to tell when this is about to happen and it is not possible to add a UPS, a battery, or a similar solution to the system. Originally, the data was stored on a file-based HSQLDB database on the virtual machine. However, the frequent power cuts eventually cause the database script file to become corrupted (not at the file system level, i.e. it is readable, but HSQLDB can't make sense of it), which leads to my question: How should data be stored in an environment where power cuts can and do happen frequently? One option I can think of is using flat files, saving each packet of data as a file on the file system. This way if a file is corrupted due to loss of power, it can be ignored and the rest of the data remains intact. This poses a few issues however, mainly related to the amount of data likely being stored on the virtual machine. At 0.5s between each piece of data, 1,728,000 files will be generated in 10 days. This at least means using a file system with an increased number of inodes to store this data (the current file system setup ran out of inodes at ~250,000 messages and 30% disk space used). Also, it is hard (not impossible) to manage. Are there any other options? Are there database engines that run on Debian that would not get corrupted by power cuts? Also, what file system should be used for this? ext3 is what is used at the moment. The software that runs on the virtual machine is written using Java 6, so hopefully the solution would not be incompatible.

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• Only receiving one document at a time from new web server.

  - by Robert Kuykendall

  We're trying to move our internal ticketing system from a Microsoft Small Business Server in the server closet to a Rackspace Cloud Server. The install is Fedora 11 LAMP, and should be default out of the box, except for the vhosts appended to the bottom of the httpd.conf. The new server is suffering from crippling load times, and watching the page load in Firebug it's easy to see the problem occurring, but I can't figure out the cause. Here is the [old server] (http://rkuykendall.com/uploads/old.server.png). I was expecting something like this, but a little slower since it was no longer hosted locally. Instead, the [new server] (http://rkuykendall.com/uploads/new.server.png) appears to only serve one file at a time. Here's another example of this [staircase load time effect] (http://rkuykendall.com/uploads/staircase.png) and another very clear example of the [staircase effect] (http://rkuykendall.com/uploads/staircase2.png). I talked to some guys on Freenode #httpd with no luck. I created a duplicate server to play with, and also created a fresh server with Fedora Core 13 and moved over just the database and web files with no luck. Any suggestions? ( image links disabled due to n00b-spam-restrictions )

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• How to tell, before buying, if a given graphics card will play Full HD video?

  - by Dominykas Mostauskis

  I am looking for the cheapest video card that would be capable of smooth playback of Full HD (1080p) video on a Full HD screen. An answer by @Mikhail on a related question briefly mentioned that: performance of video playback is largely dependent on the video accelerators present [in the card] Is this true? Could anyone expand on that? Are there any benchmarks or specifications that could be used to tell if a given (low-end) card can play Full HD video smoothly? Benchmarks I encountered are oriented towards computer games, and using them to evaluate video playback performance may be less-than-optimal, I imagine.

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• Which type of motherboard i should buy and why?

  - by metal gear solid

  If budged is not a problem. I just need best performance with less power consumption. I can purchase any cabinet , power supply and Motherboard. Is Power supply has any relation with Form factor? Is the size of motherboard and number of Slots only difference between all form factors? Is there any differences among form factors, related to performance of motherboard? Is bigger in Size (ATX) motherboard always better? Is it so smaller in Size motherboard will consume less power? What are pros and cons of each Form factor? What there are so many Form factor were created?

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• How badly do SSDs degrade without TRIM?

  - by joev

  SSDs have been out for a few years, and have seen all kinds of usage patterns. Windows and Linux support the TRIM command, with Mac OS still trailing behind here. Update (2 Aug 2011): It appears OSX Lion has support for TRIM in Apple-branded SSDs. There is a utility that enables TRIM in non-Apple SSDs I'm sure plenty of Mac users (and pre-TRIM version of Win/Linux) have SSDs. So, to you folks: have you noticed a degradation of SSD performance during its lifetime? How long have you been using the SSD, and how bad is the degradation? I'm assuming that even at its most degraded state, a modern SSD would still smoke a traditional hard drive in terms of performance.

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• Any real benefit from eBoostr?

  - by skevar7

  Is there any real data on this question?

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• Disk fragmentation when dealing with many small files

  - by Zorlack

  On a daily basis we generate about 3.4 Million small jpeg files. We also delete about 3.4 Million 90 day old images. To date, we've dealt with this content by storing the images in a hierarchical manner. The heriarchy is something like this: /Year/Month/Day/Source/ This heirarchy allows us to effectively delete days worth of content across all sources. The files are stored on a Windows 2003 server connected to a 14 disk SATA RAID6. We've started having significant performance issues when writing-to and reading-from the disks. This may be due to the performance of the hardware, but I suspect that disk fragmentation bay be a culprit at well. Some people have recommended storing the data in a database, but I've been hesitant to do this. An other thought was to use some sort of container file, like a VHD or something. Does anyone have any advice for mitigating this kind of fragmentation?

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• Storage sizing for virtual machines

  - by njo

  I am currently doing research to determine the consolidation ratio my company could expect should we start using a virtualization platform. I find myself continually running into a dead end when researching how to translate observed performance (weeks of perfmon data) to hdd array requirements for a virtualization server. I am familiar with the concept of IOPs, but they seem to be an overly simplistic measurement that fails to take into account cache, write combining, etc. Is there a seminal work on storage array performance analysis that I'm missing? This seems like an area where hearsay and 'black magic' have taken over for cold, hard fact.

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• SQL Express 2008 R2 on Amazon EC2 instance: tons of free memory, poor performance

  - by gravyface

  The old SQL Express 2005 was running on a low-end single Xeon CPU Dell server, RAID 5 7200 disks, 2 GB RAM (SBS 2003). I have not done any baseline measurements on the old physical server, but the Web app is used by half a dozen people (maybe 2 concurrently), so I figured "how bad can an Amazon EC2 instance be?". It's pretty horrible: a difference of 8 seconds of load time on one screen. First of all, I'm not a SQL guru, but here's what I've tried: Had a Small Instance, now running a c1.medium (High Cpu Medium) Windows 2008 32-bit R2 EBS-backed instance running IIS 7.5 and SQL Express 2008 R2. No noticeable improvement. Changed Page File from fixed 256 to Automatic. Setup a Striped Mirror from within Disk Management with two attached 1 GB EBS volumes. Moved database and transaction log, left everything else on the boot EBS volume. No noticeable change. Looked at memory, ~1000 MB of physical memory free (1.7 GB total). Changed SQL instance to use a minimum of 1024 RAM; restarted server, no change in memory usage. SQL still only using ~28MB of RAM(!). So I'm thinking: this database is tiny (28MB), why isn't the whole thing cached in RAM? Surely that would speed up performance. The transaction log is 241 MB. Seems kind of large in comparison -- has this not been committed? Is it a cause of performance degradation? I recall something about Recovery Models and log sizes somewhere in my travels, but not positive. Another thing: the old server was running SQL Express 2005. Not sure if that has any impact, but I tried changing the compatibility level from SQL 2000 to 2008, but that had no effect. Anyways, what else can I try here? Seems ridiculous to throw more virtual hardware at this thing. I know I/O is going to be rough on EBS volumes, but surely others are successfully running small .NET/SQL apps on reasonably priced instances?

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• How come Core i7 (desktop) dominates Xeon (server)?

  - by grant tailor

  I have been using this performance benchmark results to select what CPUs to use on my web server and to my surprise, looks like Core i7 CPUs dominates the list pushing Xeon CPUs into the bush. Why is this? Why is Intel making the Core i7 perform better than the Xeon. Are Desktop CPUs supposed to perform better than server grade Xeon CPUs? I really don't get this and will like to know what you think or why this is so. Also I am thinking about getting a new web server and thinking between the i7-2600 VS the Xeon E3-1245. The i7-2600 is higher up in the performance benchmark but I am thinking the Xeon E3-1245 is server grade. What do you guys think? Should I go for the i7-2600? Or is the Xeon E3-1245 a server grade CPU for a reason?

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• How come i7 (desktop) dominates Xeon (server)?

  - by grant tailor

  I have been using this performance benchmark results http://www.cpubenchmark.net/high_end_cpus.html to select what CPUs to use on my web server and to my surprise...looks like i7 CPUs dominates the list pushing Xeon CPUs into the bush. Why is this? Why is Intel making the i7 perform better than the Xeon. Are Desktop CPUs supposed to perform better than server grade Xeon CPUs? I really don't get this and will like to know what you think or why this is so. Also i am thinking about getting a new web server and thinking between the i7-2600 VS the Xeon E3-1245. The i7-2600 is higher up in the performance benchmark but i am thinking the Xeon E3-1245 is server grade...so what do you guys think? Should i go for the i7-2600? Or is the Xeon E3-1245 a server grade CPU for a reason?

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• Best way to set up servers for .NET performance

  - by msigman

  Assume we have 3 physical servers and let's say we are only interested in performance, and not reliability. Is it better to give each server a specific function or make them all duplicates and split the traffic between them? In other words dedicate 1 as DB server, 1 as web server, and 1 as reporting server/data warehouse, or better to put all three services on each server and use them as web farm?

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• Should I host my entire web application using https?

  - by user54455

  Actually my only requirement for using SSL encryption is that when a user logs in, the password is transferred encrypted. However after reading a bit about protocol switching, that an HTTPS session can't be taken over as an HTTP session etc. I've been asking myself if it's so bad to just have the entire application use HTTPS only. What are the reasons against it and how would you rate their importance? Please also mention: How much performance do I lose on server side (roughly)? How much performance do I lose on client side (roughly)? Any other problems on server / client side?

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• Allow more websocket connections

  - by Switz

  I want to load balance my node.js (DerbyJS to be specific) application on a basic Linode (512MB ram). It can probably take more than one process running at once. The querys/database does not concern me as I'm not doing anything intensive. The problem at the moment is that it can only handle up to ~40 websocket connections at once. I would love if I could get that number in the few hundred+ range. I anticipate a lot of traffic on launch due to the fact that it's a highly niche community with an engaged audience, but after it should be fine with just ~20-40 connections at once, which it handles perfectly as of now. I don't mind spending a bit of money for a week or two worth of running, but I also don't want to switch production environments. How can I test the process to see how many instances I am able to run on the box? Will increasing the number of processes increase the amount of websockets I can handle, or is that a limitation of the server's network? I have an old Macbook Pro running Linux sitting next to me that has 2GB ram and a 2.8 Dual Core Processor. Could I use this to handle some of the extra load? I could probably load balance with nginx to its IP. I'm on a FiOS home network. If you have any suggestions, I'd really appreciate it. Thanks

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• Very, very simple asp.net page takes forever to load

  - by John Hoge

  I've got a page that couldn't be more simple: <%@ Page Trace="true" %> <html> <head></head> <body> <h1>Hello World</h1> <a href="/OtherPage.aspx"/>Other Page</a> <p><%=DateTime.Now.ToString()%> </body> </html> ... but it takes forever to load. There is no database or web service call to slow it down. The trace command reveals that the time from Begin PreInot to End Render is .000049 seconds, but the page itself takes several seconds to load. It is a new web site I just created for this test, and just has a web.config & two test files. The only thing in the web.config is access control: <authorization><allow users="domain\me" /><deny users = "*"/></authorization> What else could IIS be doing with all of that time?

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