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• How many websites can my server potentially hold?

  - by Daniel Kindler

  Sorry for the "noob" question, but... About how many medium-sized websites with average traffic could this server hold? Just like the average website, kind of like a small business site. How many sites could this server hold, but still maintain nice, decent speed? PowerEdge R510 PE R510 Chassis for Up to Four 3.5" Cabled Hard Drives, LED edit Processor Intel® Xeon® E5630 2.53Ghz, 12M Cache,Turbo, HT, 1066MHz Max Mem edit Memory 8GB Memory (4x2GB), 1333MHz Single Ranked UDIMMs for 1 Procs, Optimized edit Operating System SUSE Linux Enterprise Server 10, SP3, Up To 32 CPU Lic, 1 YR Sub, DIB, Media edit Red Hat Enterprise Linux Licensing Hard Drives 250GB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 1TB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 2 X 2TB 7.2K RPM SATA 3.5in Cabled Hard Drive Hard Drive Configuration No RAID, Embedded SATA Controller for x4 Chassis edit Power Supply 480 Watt Non-Redundant Power Supply edit Thank you!

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• How do I choose a database?

  - by liamzebedee

  I need a comparison table of some sort for database varieties (MySQL, SQLite etc.). I can't find one. My use case is, I am implementing storage of objects in a distributed hash table. I need a database solution that is: Fast for sorting Simplistic (no users, preferably no additional structures like multiple tables etc.) Concurrent (if possible) Multi-platform File based (not stored in memory primarily) Centralized I will be programming in Go. As I understand, I believe I need what is called a Document Orientated Database, because I am storing objects, identified by keys. EDIT: While I am implementing a DHT, I will also be storing metadata about the objects, such as access counts etc. It would also be preferable to have TLL (time to live)

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• How does the performance of pure Nginx compare to cpNginx?

  - by jb510

  There is now a Cpanel plugin to fairly easily setup Nginx as a reverse proxy on a Cpanel/Apache server. I've been simultaneously interested in setting up my first unmanaged VPS and my first Nginx server and as a masochist figured why not combine the two. I'm wondering however if it's worth setting up a pure Nginx server vs trying out cpNginx on Apache? My goal is solely to host WordPress sites and while what I've read raves about Nginx's is exceptional ability serving static at least as a reverse proxy, I am unclear if there is substantial benefit to running a pure nginx with eAccelorator over cpNginx on Apache for dynamic sites? Regardless I'll be running W3TC on all sites to cache content, but am still interested if there are big CPU reductions running PHP scripts under pure Nginx over cpNginx?

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• Help regarding no sql databases like hadoop, hbase etc

  - by user560370

  I am new to the distributed NoSQL databases like Hadoop, Cassandra, etc. I have few questions for which I seek an expert advice: Can you list problems/challenges one will generally face when making a shift from the present conventional database like MySQL to these large cluster-based databases? What are the difficulties, if any, when one needs to adapt to a newer version of these open source projects? Can you list out the things which are generally stored/kept in memcached for fast rendering of the page? How can I understand the source code of open-source projects so that I can build on it and maybe give back to the community? Above questions may sound to be idiotic and basic but please it's a request for the experts to answer the above questions in detailed and to best of their abilities.

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• c++ programming for clusters and HPC

  - by Abruzzo Forte e Gentile

  HI All I need to write a scientific application in C++ doing a lot of computations and using a lot of memory. I have part of the job but due to high requirements in terms of resources I was thinking to start moving to OpenMPI. Before doing that I have a simple curiosity: If I understood the principle of OpenMPI is the developer that has the task of splitting the jobs over different nodes calling SEND and RECEIVE based on node available at that time. Do you know if it does exist some library or OS or whatever that has this capability letting my code reamain as it is now? Basically something that connects all computers and let share as one their memory and CPU? I am a bit confused because of the high material available on the topic. Should I look at cloud computing? or Distributed Shared Memory? Can you help me or address me a bit? Thanks

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• I know this is a stupid question but... How many websites can my server potentially hold?

  - by Daniel Kindler

  Sorry for the "noob" question, but... About how many medium-sized websites with average traffic could this server hold? Just like the average website, kind of like a small business site. How many sites could this server hold, but still maintain nice, decent speed? PowerEdge R510 PE R510 Chassis for Up to Four 3.5" Cabled Hard Drives, LED edit Processor Intel® Xeon® E5630 2.53Ghz, 12M Cache,Turbo, HT, 1066MHz Max Mem edit Memory 8GB Memory (4x2GB), 1333MHz Single Ranked UDIMMs for 1 Procs, Optimized edit Operating System SUSE Linux Enterprise Server 10, SP3, Up To 32 CPU Lic, 1 YR Sub, DIB, Media edit Red Hat Enterprise Linux Licensing Hard Drives 250GB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 1TB 7.2K RPM SATA 3.5" Cabled Hard Drive edit Hard Drives 2 X 2TB 7.2K RPM SATA 3.5in Cabled Hard Drive Hard Drive Configuration No RAID, Embedded SATA Controller for x4 Chassis edit Power Supply 480 Watt Non-Redundant Power Supply edit Thank you!

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• How to enable Chinese on Debian lenny?

  - by Computist

  I have already installed Chinese fonts $ sudo apt-cache search chinese $ sudo apt-get install ttf-arphic-bkai00mp ttf-arphic-bsmi00lp ttf-arphic-gbsn00lp ttf-arphic-gbsn00lp ... added locales $ sudo dpkg-reconfigure locales, and chose the following en_US.UTF-8 UTF-8 zh_CN GB2312 zh_CN.GBK GBK zh_CN.UTF-8 UTF-8 zh_TW BIG5 zh_TW.UTF-8 UTF-8 However when I try to create a file with Chinese characters in file name by touch <some chinese characters ...>.txt, it fails and substituted Chinese characters with --------- at terminal. How to fix this? [Edit, Aug. 15, 2011, 21:42] After rebooting, everything is working.

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• MySQL Optimizing

  - by Thoman

  Hello My web use an dedicated Intel(R) Xeon(R) CPU E5620 8core 12Gram Centos32bit/Driectadmin DISK SAS 80G Php-cgi This dedicated running one website Use wordpress 2.92(+plugin cache...) Database size 600MB only 100online But mywebsite runing very snow. please hep me config file my.cnf [mysqld] user=mysql key_buffer=128M set-variable = max_connections=1000 socket = /var/lib/mysql/mysql.sock key_buffer =32M table_cache = 1024 open_files_limit = 16344 join_buffer_size = 8M read_buffer_size = 8M sort_buffer_size = 8M tmp_table_size=512M read_rnd_buffer_size=8M max_heap_table_size=256M #myisam_sort_buffer_size=256M thread_cache_size=8 thread_cache=32 query_cache_type=1 query_cache_limit=1024M query_cache_size=1024M thread_concurrency = 16 wait_timeout = 10 connect_timeout = 10 interactive_timeout = 10 long_query_time=1 log-slow-queries = /var/log/mysqlslowqueries.log max_allowed_packet=32M skip-innodb [myisamchk] key_buffer = 64M sort_buffer = 64M read_buffer = 16M write_buffer = 16M [isamchk] key_buffer=64M sort_buffer=64M read_buffer=16M write_buffer=16M And apache

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• How do I protect python code?

  - by Jordfräs

  I am developing a piece of software in python that will be distributed to my employer's customers. My employer wants to limit the usage of the software with a time restricted license file. If we distribute the .py files or even .pyc files it will be easy to (decompile), and remove the code that checks the license file. Another aspect is that my employer do not want the code to be read by our customers, fearing that the code may be stolen or at least the "novel ideas". Is there a good way to handle this problem? Preferably with an off-the-shelf solution. The software will run on Linux systems (so I don't think py2exe will do the trick)

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• Optimize Windows file access over network

  - by Djizeus

  At my company I frequently need to access shared files over a Windows network. These files are located on the other side of the planet, so I guess the file share goes through some kind of VPN over Internet, but I don't control this and it is supposed to be "transparent" for me. However it is extremely slow. Displaying the content of a directory in the file explorer takes about 10s. Even if over the Internet, I did not expect that retrieving a list of file names would be that long. Are there any settings to optimize this from my Windows XP workstation, or is it mostly related to the way the network is configured? The only thing I have found so far is to cache all file names, while by default only short file names are cached (http://support.microsoft.com/kb/843418).

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• Help recovering lost text from a refreshed Chrome webpage (it was in the clipboard as well)? [closed]

  - by tobeannounced

  Possible Duplicate: Chrome: where is the location to save browse temporary files Ok, so here's what happened - and yes, it was pretty stupid by me: I wrote up and submitted a post on Stack Overflow It was not suited to be placed on Stack Overflow as someone pointed out to me, so I deleted the post (this was a few hours ago) I copied the text into a new question page on Super User, but didn't submit it yet I accidentally just refreshed the webpage that had the text, and the question has now been deleted from Stack Overflow I have Lazarus installed, however the Chrome version doesn't have many features and the text was not recoverable from there. I do not have a clipboard manager, but the text was copied to my clipboard - so is there any way to get this back (Windows 7)? Although the post on Stack Overflow was deleted, I suppose it would have existed in my cache - could I recover it from there? Would the post on Stack Overflow exist in an rss feed anywhere? Many thanks, and I hope I can find this - and I am sure that the solution will prove valuable for me (and others) in the not too distant future once again.

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• C# similar technologies and books in Java

  - by MigNix

  Hi, I know this can look like dublicate of other discussions and I have already reviewed them, but they are different. I want to learn Java and I want to know are there any books similar to those that I have seen for C#. Here is the list: C# 4.0 in a Nutshell: The Definitive Reference Probably Java in a Nutshell :) Professional C# 4.0 and .NET 4 Pro C# 2010 and the .NET 4 Platform Accelerated C# 2010 Programming WCF Services Essential Windows Communication Foundation (WCF): For .NET Framework 3.5 C# in Depth: What you need to master C# 2 and 3 CLR via C# Professional ADO.NET 3.5 with LINQ and the Entity Framework Professional Enterprise .NET Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries Mainly I am interested in Java 6 and want to know about JVM , Cuncurency, Data access and distributed application technologies. I have seen there are some books on JVM like Inside the Java 2 Virtual Machine also some free books on official web site. Also I found concurrent programming in Java. But may be you can suggest any others. Thank you

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• Very frequent "Server not found" messages

  - by Village

  Recently, while browsing and clicking or typing an address, I get: "Server not found", "Connection was reset", or a half-loaded page. Usually the page loads instantly after clicking reload, but this means I must reload on every page. Images on one site, but stored at a different server don't load until reloading for a second time. Clicking "submit" on many sites frequently doesn't work unless I reload many times. Sometimes sites load, but without colors and formating, appearing as if they would in Lynx. This seems to happen with every Web site. My Internet service claims everything on their end is fine. This happened a day after running an update in aptitude. I have not updated any hardware. I have tried clearing Iceweasel's cache. I do not have any router or other equipment. What could be going on? How can I troubleshoot this? PPPoE connection, Iceweasel 3.5.16, Debian 6

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• Random numbers from binomial distribution

  - by Sarah

  I need to generate quickly lots of random numbers from binomial distributions for dramatically different trial sizes (most, however, will be small). I was hoping not to have to code an algorithm by hand (see, e.g., this related discussion from November), because I'm a novice programmer and don't like reinventing wheels. It appears Boost does not supply a generator for binomially distributed variates, but TR1 and GSL do. Is there a good reason to choose one over the other, or is it better that I write something customized to my situation? I don't know if this makes sense, but I'll alternate between generating numbers from uniform distributions and binomial distributions throughout the program, and I'd like for them to share the same seed and to minimize overhead. I'd love some advice or examples for what I should be considering.

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• Database for Large number of 1kB data chunks (MySQL?)

  - by The Unknown

  I have a very large dataset, each item in the dataset being roughly 1kB in size. The data needs to be queried rapidly by many applications distributed over a network. The dataset has more than a million items (so 500 million+ 1kB data chunks). What would be the best method to storing this dataset (need to allow adding more items, and reading them rapidly, but never modifying already added data)? Would using a MySQL DB using the binary blob format be appropriate? Or should each of these be stored as files on a file system? edit: the number is 1 million items now, but needs to be able to scale to well over 500 million items easily.

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• Nginx issue with two web nodes

  - by HTF

  I'm running Wordpress website with Nginx and Memcached. I have simple DNS round robin balancing with A records pointing to both web servers. I've noticed the following entries in both web servers access logs: 192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 192.168.1.10 example.com - [07/Jun/2012:22:43:58 +0100] "-" 400 0 "-" "-" - 0.000 I've configured W3 Total cache plugin for Wordpress - pointing to loopback address (127.0.0.1:11211) on each Wordpress installation. Is this because the webserver is trying to access content that is cached on the other web server? Shall I add IPs to W3 plugin of both web servers on each website (192.168.1.:11211, 192.168.1.2:11211)? I'm not sure if this related to Memcached or maybe some configuration issue on the server itself? Regards

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• Disk controller speed responsible for slow write speeds?

  - by vizvayu

  I have question. I'm using ESXi 4.0U1 in an IBM x3200M2 with an integrated LSI 1064e RAID controller, without any kind of cache. I have 3 250GB HOT-SWAP SATA HDs configured in RAID1E (IME). ESXi works fine, read speed are quite OK, but write speeds are incredible slow, never more than 8MB/s, and this is the best case scenario, benchmarking with iozone streaming writes, using a VMWare Paravirtual controller and with only this VM active, no swapping of any kind (total vm memory reserved). Already wrote to IBM but I don't have any kind of pay support so they didn't even answered, so I'm just wondering... anybody has any experience with a similar setup? I just want to be sure this is hardware related and can't be fixed with some kind of config option, because I'm thinking on buying a new RAID controller (Adaptec 2405 looks nice). Thanks again!

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• Boot Loop contiues [closed]

  - by user1894750

  I am facing boot loop. My backend Linux works flawlessly, But the Zygote and System server does not workout. I can still use ADB and LIVE cat .. ps show that both Zygote and system_server process are there, But boot animation remains forever !! I have : 1 Wiped Data + Cache Partition 2 System Partition has been RESTORED.. There is NO PERMISSION problem... I think that there is *problem with Zygote and System_server ..* my device: Karbonn A9+ Dual Core Snap Dragon 1.2 Ghz Ram 386MB OS : ICS 4.04 Any suggestions ??

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• Why does yum index get corrupted?

  - by TomOnTime

  Occasionally yum's cache gets corrupted and we see errors like this: error: db3 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db3 - (-30974) error: cannot open Packages database in /var/lib/rpm The workaround is rm -f /var/lib/rpm/__db* and then the next "yum" command regenerates the data. My question is: what is likely to be causing this? Is there some common task that ignores locks or has other problem that causes this? We have hundreds of CentOS machines and there is no pattern to which see this problem. It could be a "one in a million" issue, which at large scale is seen often. NOTE: I realize this is a very "open ended" question, but if an answer finds the cause, I will go back and turn the question into something more canonical that directly relates to the specific issue.

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• Global variables in hadoop.

  - by Deepak Konidena

  Hi, My program follows a iterative map/reduce approach. And it needs to stop if certain conditions are met. Is there anyway i can set a global variable that can be distributed across all map/reduce tasks and check if the global variable reaches the condition for completion. Something like this. While(Condition != true){ Configuration conf = getConf(); Job job = new Job(conf, "Dijkstra Graph Search"); job.setJarByClass(GraphSearch.class); job.setMapperClass(DijkstraMap.class); job.setReducerClass(DijkstraReduce.class); job.setOutputKeyClass(IntWritable.class); job.setOutputValueClass(Text.class); } Where condition is a global variable that is modified during/after each map/reduce execution.

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• IIS doesn't respond to 127.0.0.1 (external IP works fine)

  - by Jordan

  I have an AWS web server - call it box.company.com. It's running IIS and if I visit http://box.company.com in a web browser (from any machine, including box.company.com), it responds correctly with our site. However, if I visit localhost/ or 127.0.0.1/ when I'm logged into box.company.com, I get a "couldn't connect to host" message. The hosts file has only one entry - the standard "127.0.0.1 localhost" line. Pinging 127.0.0.1 works fine. Pinging localhost correctly resolves to 127.0.0.1 and works fine. I've tried restarting IIS and restarting the DNS Cache. I had this problem once before, and restarting the server fixed it, but I'd like to know what's going on in case this happens again in the future.

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• All browsers hang on windows 7 in tab says 'Waiting for...' need restart

  - by Lakshmila

  I'm having a frustrating problem with browsers on OS windows 7 home premium. IE 10: My web browsing works ok for a while and then pages freeze and tab at top says "Waiting for ...' and never loads. Strangely I can still get to Google search results but if I click anything it freezes. Chrome freezes too and says 'The page has become unresponsive ...kill page' Safari stops also. I have tried clearing cookies, cache, turning off Bitdefender firewall and nothing apart from a restart fixes it. consequently I am forced to restart my computer several times a day to stop this browser hang. I have no idea what could be causing this ..any help greatly appreciated.

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• Facing difficulty with migrating from wordpress to Drupal

  - by rakibtg

  One of my blog was build of Wordpress but now i want to use Drupal as the CMS of my Blog. To do so I have deleted all the Wordpress files from my server and the Database and MySQL user which are associated with wordpress blog and uploaded the Drupal files in my server directory where the wordpress files were. But, when i have opened the blog it shows the Wordpress blog! though its been deleted and their should be the Drupal Installation interface. So, i have re-checked my server directories and database, there is not wordpress files and wp database all are deleted, there is only the drupal files, but when i go to the blog to install drupal there is still the Wordpress blog, I have checked the blog in many web browsers and there is not cache memory problem. My hosting server is linux based. can't understand what to do? Any idea? Thanks

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• Microphone input

  - by George

  I'm trying to build a gadget that detects pistol shots using Android. It's a part of a training aid for pistol shooters that tells how the shots are distributed in time and I use a HTC Tattoo for testing. I use the MediaRecorder and its getMaxAmplitude method to get the highest amplitude during the last 1/100 s but it does not work as expected; speech gives me values from getMaxAmplitude in the range from 0 to about 25000 while the pistol shots (or shouting!) only reaches about 15000. With a sampling frequency of 8kHz there should be some samples with considerably high level. Anyone who knows how these things work? Are there filters that are applied before registering the max amplitude. If so, is it hardware or software? Thanks, /George

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• Should we be giving the client's management team direct access to our git hub repository so that the

  - by SharePoint Newbie

  Hi, We are presently working for a client who is new to working with distributed teams. We have teams spread across India and the UK. Although we have decent project tracking tools (Mingle), would it be a good idea to the give the PM at the client access to our git hub repo. Would this be make it easier for them (see what the devs are working on and an insight into what the team has been developing). I agree that noot all commit messages would make sense to them but would this be a good way to boost their confidence in what we are doing? They already can check out our fortnightly releases on our QA and UA environments, but this still is behind dev by 5-6 days. Also, is there any reporting for git hub which makes it easier for PM types to make sense of it all? Thanks

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