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• k-means clustering in R on very large, sparse matrix?

  - by movingabout

  Hello, I am trying to do some k-means clustering on a very large matrix. The matrix is approximately 500000 rows x 4000 cols yet very sparse (only a couple of "1" values per row). The whole thing does not fit into memory, so I converted it into a sparse ARFF file. But R obviously can't read the sparse ARFF file format. I also have the data as a plain CSV file. Is there any package available in R for loading such sparse matrices efficiently? I'd then use the regular k-means algorithm from the cluster package to proceed. Many thanks

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• SOLVED - UBIFS partition mounting at startup [closed]

  - by Bartlomiej Grzeskowiak

  [SOLVED] - add ubi.mtd=volume_name to bootargs in uboot I want to mount UBIFS partition via /etc/fstab at startup. I created UBIFS and Volume: # ubiformat /dev/mtdX # ubiattach -p /dev/mtdX # ubimkvol /dev/ubi0 -N volume_name -s 64MiB # ubiupdatevol /dev/ubi0_0 /path/to/ubifs.img # mount -t ubifs ubi0:volume_name /mount/point but after reboot this line in etc/fstab doesn't work: ubi0:volume_name /mnt/user ubifs defaults 0 0 There is no fs mounted in /mnt/user. Also when I try to call mount -a: mount: mounting ubi0:volume_name on /mnt/user failed: No such device There are no ubi0,ubi0_0 in /dev. I also don't see any UBI calls in dmesg like here: UBIFS boot error

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• Which permissions need to be assigned to a normal user to allow him to change SHARE permissions?

  - by guest

  As in the subject - I am wondering, which permissions (if it is possible) do I need to assign to a regular user to modify the share permissions - e.g. to add another user with full control permissions, or to deny someone read access to the folder - on a share level. I know that this is possible through NTFS permissions, but I am wondering whether it is also possible on share level. Any ideas how to do that? Or perhaps only the adminstrator/creator/person who shared the folder has the access to this? I am using win2003 Any ideas? Thanks

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• Refactoring a long method that simply populates

  - by Jeune

  I am refactoring a method which is over 500 lines (don't ask me why) The method basically queries a list of maps from the database and for each map in the list does some computation and adds the value of that computation to the map. There are however too many computations and puts being done that the code has reached over 500 lines already! Here's a sample preview: public List<Hashmap> getProductData(...) { List<Hashmap> products = productsDao.getProductData(...); for (Product product: products) { product.put("Volume",new BigDecimanl(product.get("Height")* product.get("Width")*product.get("Length")); if (some condition here) { //20 lines worth of product.put(..,..) } else { //20 lines worth of product.put(..,..) } //3 more if-else statements like the one above try { product.put(..,..) } catch (Exception e) { product.put("",..) } //over 8 more try-catches of the form above } Any ideas on how to go about refactoring this?

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• Can a S3 mount be used as the document root for Apache?

  - by Hesse

  Has anyone been successful in having their DocumentRoot reside on an S3 mount (using s3fs)? I currently have a mounted bucket at /mnt/s3. I can read and write files to it no problem. In my httpd.conf I have DocumentRoot "/mnt/s3". When I restart Apache I get the error "DocumentRoot must be a directory". Has anyone tried something similar. My goal is to have a shared storage space so my nodes can scale easily and access the same document root. Thanks

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• Display CPU usage separately (without root privileges)

  - by synaptik

  I need to display the CPU usage for each processing core on a single shared-memory 12-core (SMP) machine. I don't have access to install htop, else I would simply use that. I don't need fancy graphs or meters, though they would be nice. For example, simply displaying: X X X X X X X X X X X X where each X is the percentage utilization of 1 of the 12 processing cores on my machine. FYI: I know I can simply look at the utilization in "top" and divide that number by the number of cores on my machine, but I prefer a solution that shows each core separately.

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• What is the best way to configure the number of workers in Apache?

  - by rbm

  My site receives a lot of traffic for 2 hours during the day (2000 hits per minute). The rest of the day receives less traffic(500e hits per minute). I have been experimenting with the MaxClients and MaxSpareServers values but I still get some downtime during peek hours. How can I calculate the best values for my configuration based on the amount of ram that I have ? Each process is like 36-40 M of Memory total used free shared buffers cached Mem: 3096 793 2302 0 0 0 -/+ buffers/cache: 793 2302 Swap: 0 0 0 Values that I am using now <IfModule prefork.c> StartServers 10 MinSpareServers 22 MaxSpareServers 60 ServerLimit 90 MaxClients 90 MaxRequestsPerChild 400 </IfModule>

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• Permission denied when trying to execute a binary burned to a CD-R

  - by user16654

  On an Ubuntu 9.10 (Karmic Koala) machine, I burned a CD from the command prompt using: cdrecord -v speed=16 dev=0,1,0 /FPS.iso The CD now contains an executable and some files. I tested the CD by loading it onto another machine (Red Hat 5.3) and when I try to run the program I get the following message: bash: ./FPS1_1: Permission denied I can open other files like text documents (the executable also comes with shared libraries). I realized I had burned the CD as root so I burned another one as another user but I still have the same problem. How can I remove this permission or what is the problem? P.S. the image was in / if that helps

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• How to exclude IP from htaccess domain redirect

  - by ijujym

  I'm trying to write a custom redirect rule for some testing purposes on 2 domains with exactly same site. The code I am using is: RewriteEngine on RewriteCond %{REMOTE_ADDR} !^1\.2\.3\.4$ RewriteCond %{HTTP_HOST} ^.*site1.com [NC] RewriteRule ^(.*)$ http://www.site2.com/$1 [R=301,L] What I want is to redirect all requests for site1 to site2 except for requests from IP address 1.2.3.4. But currently requests from that IP are also being redirected to site2. Is there something I've missed in settings? ( note: both domains are on the same shared hosting account )

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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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• How to move mail accounts when migrating webhosting

  - by pkswatch

  I am migrating my website abc.com from one webhosting company to another in a shared hosting environment. Both have cpanel. And the second hosting account i am preparing to move is my multi-domain hosting account with 3 domains already in it. The problem is, i have many email accounts associated with my website abc.com, which are accessed using webmail. So if i move it to the other host, will i lose all those accounts and their emails? If yes, then how should i synchronise the email accounts so that all the accounts and the contained emails remain intact? I saw some several sync tools like IMAP Sync, etc. But these require two hosts while synchronizing, and as you see, i have just one domain name to be synchronized over 2 servers. PS, i do not have any ssh access on either of them, and i have made complete backup of all files using backup wizard in cpanel.

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• Horizontal Scaling of Tomcat in Microsoft Azure

  - by Fabe

  Hey everyone, I am working on this quiet a while, but still no conclustion. I want to do horizontal scaling of Tomcat instances in Microsoft Azure (1,2,3,... Tomcat instances for one service). I read lots of articles about session replication, clustering,... with Tomcat. Since Azure does not support Multicasts, there is no easy way to cluster Tomcat. Also sticky sessions is no options, because Azure does round robin load balancing. Setting up two services - one with Terracotta or Apache mod_jk - and the other with Tomcat instances seems overkill for me (if even doable)... Is this even possible? Thanks in advance for reading and answering my question. Every comment/idea is highly appreciated.

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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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• J2EE/EJB + service locator: is it safe to cache EJB Home lookup result ?

  - by Guillaume

  In a J2EE application, we are using EJB2 in weblogic. To avoid losing time building the initial context and looking up EJB Home interface, I'm considering the Service Locator Pattern. But after a few search on the web I found that event if this pattern is often recommended for the InitialContext caching, there are some negative opinion about the EJB Home caching. Questions: Is it safe to cache EJB Home lookup result ? What will happen if one my cluster node is no more working ? What will happen if I install a new version of the EJB without refreshing the service locator's cache ?

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• Java stop MIDI playback

  - by user456268

  Hi I have java application which plays midi messages from sequence. I'm doing this using jfugue library. the problem is when I'm tryingto stop playback with stop button (which call sequencer.stop() and sequencer.close()) the last played note is sound all of rest time, and I can't stop it. So I'm asking about solution about stopping all audio and MIDI too! sound playback from java application. Notice: If you want propose just mute volume, you need to know that I want end-use will be able to press play button again and hear the sound again, so muting volumr will be not a solution, or explain please. Thank you!

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• Homegroup libraries visible but can't be opened

  - by majocha

  I have 2 Windows 7 PCs in a home network. When I create a homegroup, the libraries I share are visible on the opposing machine but when I doubleclick them nothing happens - no error message, nothing at all. It is the same on both computers. The homegroup works to the extent that the printer I shared is visible and can print from the other computer. Only the libraries are inaccessible. What I tried and checked so far, without result: disabling firewall file and printer sharing, MS Networks client enabled in network properties deleting and recreating homegroup reset homegroup by deleting C:\Windows\ServiceProfiles\LocalService\AppData\Roaming\PeerNetworking unsharing and sharing again the libraries

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• Serve PHP page in web root but show contents in subdirectories

  - by David

  I have a web site on a shared hosting server. My directory layout looks like this /home /user /public_html /pics /family There is an index.php file in public_html. I need help writing .htaccess rules that will Serve the index.php file when www.domain.org is requested Force the user back to public_html when www.domain.org/pics is requested Allow the user to see the directory contents when www.domain.org/pics/family is requested I experimented with a lot of combinations of RewriteCond and RewriteRule, but I don't understand the documentation and examples well enough to know if what I want to do is even possible. The web server application is some version of Apache.

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• FlockDB - What is it? And best cases for it uses.

  - by Guru

  Just came across FlockDB graph database. Details at github /flockDB. Twitter claims it uses FlockDB for the following: Twitter runs FlockDB on a large cluster of machines. we use it to store social graphs (who follows whom, who blocks whom) and secondary indices at twitter. At first glance, setup and trying it doesn't look straight forward. Have anyone already used it / setup this? If so, please answer the following general queries. What kind of applications is it better suited for? (Twitter claims it is simple and very rough, it remains to see what it meant though) How is FlockDB better than other graph db / noSQL db. Have you setup FlockDB, used it for a application? Early advices any? Note: I am evaluating the FlockDB and other graph databases mainly for learning them. Perhaps, I will build an application for that.

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• Can't copy files from network drive

  - by user630320

  I have weird problem with copying files. When I copy file from network drive into C drive nothing happens but when I copy file from network drive to desktop I can copy the file. Also if I copy files from desktop into C it works fine. I have full local admin permission on this PC and the network drive. I have try these things Created new profile Run Windows Update Run checkdisk I'm using Windows XP 32bit pro Update: Network path: \\server1\shared\folder PC: C:\ (this doesn't work) C:\Documents and settings\Userid\Desktop (This works fine)

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• Type 1 Hypervisor on the desktop

  - by Blazemore

  I have a powerful home PC, and I've used VirtualBox to run Linux distros in Windows (and vice versa). I'm interested in trying out a lightweight type 1 hypervisor to run all my operating systems (Windows 7, Debian, Arch) and was looking for suggestions of which to pick and how to implement this. From what I gather, a type 1 hypervisor is a lightweight OS which simply provides VM management functionality. Will I get reasonable performance under each guest OS? Can all the guest OSs have access to a shared data drive, or is is best to have a storage server in another guest OS and mount it over the virtual network? What about gaming, is this feasible, or will I realistically need to run Win7 on bare metal? I'd appreciate any input.

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• Using Python, How to copy files in 'temporary internet files' folder in Windows

  - by pythBegin

  I am using this code to find files recursively in a folder , with size greater than 50000 bytes. def listall(parent): lis=[] for root, dirs, files in os.walk(parent): for name in files: if os.path.getsize(os.path.join(root,name))>500000: lis.append(os.path.join(root,name)) return lis This is working fine. But when I used this on 'temporary internet files' folder in windows, am getting this error. Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> listall(a) File "<pyshell#2>", line 5, in listall if os.path.getsize(os.path.join(root,name))>500000: File "C:\Python26\lib\genericpath.py", line 49, in getsize return os.stat(filename).st_size WindowsError: [Error 123] The filename, directory name, or volume label syntax is incorrect: 'C:\\Documents and Settings\\khedarnatha\\Local Settings\\Temporary Internet Files\\Content.IE5\\EDS8C2V7\\??????+1[1].jpg' I think this is because windows gives names with special characters in this specific folder... Please help to sort out this issue.

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• Windows server 2003SP2 as LDAP replica master for Mac OSX 10.6

  - by FrancoR

  Hello there, we have a single domain controller with Windows 2003 with few child. All the users are in the main DC. We have already created a connection from AD to Mac Xserve 10.6 and can read all the users, but: 1. If the DC goes down (or the net), Mac lose all the users, so no file access, no emails, no nothing. 2. the users are in read only. Mac admin cannot reset password, change attribute and so on. What we need is a stable environment where both AD admins and LDAP admins can manage the users; if one server goes offline the users of the other server should work (email, shared folders) just fine. Thanks in advance P.S. we already tried to connect the MacOSX to Windows LDAP, instead of AD, but we're unable to do it: MacOSX requires DNS IP (gotcha), user admin and password (ok) and a root LDAP password we're unable to find any reference of it in Windows 2003.

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• How to keep programs from source up to date?

  - by wizard

  I'm designing a new server setup for hosting multiple websites. (Shared hosting for my clients over at SliceHost.) I've recently moved away from the traditional LAMP setup and chosen Ubuntu, Nginx, php-fpm and mysql. I like it a lot better then my old Apache, suphp, mysql setup. It works great, provided encapsulation between sites and uses substantiallly less memory. However I have one major maintenance problem. In order to have a recent version of Nginx and in order to use php-fpm I've had to compile these programs from source. The reason I see this as a problem is that keeping track of updates, and build configurations will end up being a lot of work. For two programs (and a patch) I can handle it, but it seems like this setup would not scale with many packages and servers. Are there good ways to manage this situation? I'm sure people do this all the time.

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• Gnome+NX clipboard behavior; auto-copy on select?

  - by threecheeseopera

  I am having issues with the Gnome(/Linux/Debian+Ubuntu) clipboard when connected remotely; it's default behavior appears to be to automatically add text to a clipboard buffer when that text is selected. This is not usually a problem, until I need to log into one of these systems remotely (w/ GUI), and attempt to use a shared clipboard. If I 'copy' text on the local machine (destined to replace some text on the remote machine), that copy buffer is overwritten as soon as I select the text on the remote machine to be replaced. Is there some way around this? It sort of drives me nuts. Thanks! UPDATE: This is really an NX server issue; X11 supports multiple clipboards ("selections": clipboard, primary. secondary; see this excellent article) that behave differently, and it appears that my problem is related to how NX server translates this over to the host machine.

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• kmeans based on mapreduce by python

  - by user3616059

  I am going to write a mapper and reducer for the kmeans algorithm, I think the best course of action to do is putting the distance calculator in mapper and sending to reducer with the cluster id as key and coordinates of row as value. In reducer, updating the centroids would be performed. I am writing this by python. As you know, I have to use Hadoop streaming to transfer data between STDIN and STOUT. according to my knowledge, when we print (key + "\t"+value), it will be sent to reducer. Reducer will receive data and it calculates the new centroids but when we print new centroids, I think it does not send them to mapper to calculate new clusters and it just send it to STDOUT and as you know, kmeans is a iterative program. So, my questions is whether Hadoop streaming suffers of doing iterative programs and we should employ MRJOB for iterative programs?

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