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• Measuring performance indicators on a cluster

  - by Aditya Singh

  My architecture is based on Amazon. A ELB load balancer balances POST requests among m1.large instances. Every instance has a nginx server on port 80 which distributes the requests to 4 python-tornado servers on backend which handle the request. These tornado servers are taking about 5 - 10ms to respond to one request but this is the internal compute time of every request. I want to put this thing on test and i want to measure the response time from ELB to upstream and back and how does it vary when the QPS throughput is increased and plot a graph of Time vs. QPS vs. Latency and other factors like CPU and Memory. Is there a software to do that or should i log everything somewhere with latency checks and then analyze the whole log to get the stuff out. I would also need to write a self-monitor which keeps checking the whole response time. Is it possible to do it with a script from within the server. If so, will it be accurate ?

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• Apache suddenly very slow on http and faster on https

  - by hsnm

  Background: I have Apache 2 running on ubuntu. There is a low usage on it and mostly being accessed for a web service URL from mobile apps. It was working fine until I installed SSL certificates. I now have both http and https. When I access the server using https, I get a fairly quick response (but probably not as fast as before). When I use http, it's so slow. What I tried: From this post: I curl localhost from the host and it takes some time, meaning there is no routing issue. The server runs on Amazon EC2 instance and is managed by me only. Also: I see that Apache once running, creates the maximum number of processes it is allowed to, which was not the case before. I lowered the MaxClients to 20 and I think I'm getting faster responses but it still takes over a minute and I always have MaxClients Apache processes. dmesg returns many [ 1953.655703] TCP: Possible SYN flooding on port 80. Sending cookies. When I netstat I get many entries with SYN_RECV. Possibly a DDoS attack? From EC2's monitoring diagrams I see a pattern of high "Maximum Network In (Bytes)" since 2 days ago. By the way the server is still being tested, the actual traffic is very low and not consistent. I tried to go with this solution to limit incoming connections using iptables, still no luck, but I'm trying. Question: What could be the problem? Is this a DDoS attack?

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• Drowning in documents - recommend doc management solutions?

  - by Martin Day

  I've been researching document management lately. I want to organise my docs at home and also at the office. Finding affordable solutions one can actually test drive is quite hard. Some that I've downloaded just don't seem to work (testing on brand new Vista PC). I've seen some software on Amazon like Paperport but not really sure what they're like. For home I'd like something to organise files, full text search, good scanner integration, nice interface etc. But for the office it seems harder. I need something that does proper workflow and keeps versions. It will have an audit trail. Documents can be approved, checked in/out etc. I know a few clients who would like something similar. It would be great just to import thousands of documents from a shared drive and get them indexed with dupes killed. I'd like to be super clear about how/where the documents are being stored so that maintenance and backups are clear. My Google/twitter searches lead back to the same tired and vague webpages pushing what look like expensive and custom made solutions. Some might be very good I suppose but it's darn hard to tell. I don't mind a hosted package but all in all I don't think something like Google Docs, as good as it is now, will work. There are too many quirks and missing features (as compared to Office). Being able to work directly with the common Office file formats is important. I've noted a similar sounding question asked here back in August but it didn't seem to turn up too many solutions that I could easily and quickly apply. Also there could have been some changes since then so I feel it's worth asking.

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• FTP won't open a connection to client

  - by Ben

  I am running Windows server 2008 on Ubuntu server 12.04.1 via devstack and I am trying to download a file from an ftp server using the windows command line ftp client. When I run the ftp get command I get the following error message: 500 I won't open a connection to 10.0.0.2 (only to XX.XX.XX.XX) 425 No data connection 10.0.0.2 is the internal IP address of the instance, whereas XX.XX.XX.XX is the external address. Is there anyway to make the ftp client use the external address for the data connection, or alternatively have the client establish the connection? Thanks

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• Using 'new' in a projection?

  - by davenewza

  I wish to project a collection from one type (Something) to another type (SomethingElse). Yes, this is a very open-eneded question, but which of the two options below do you prefer? Creating a new instance using new: var result = query.Select(something => new SomethingElse(something)); Using a factory: var result = query.Select(something => SomethingElse.FromSomething(something)); When I think of a projection, I generally think of it as a conversion. Using new gives me this idea that I'm creating new objects during a conversion, which doesn't feel right. Semantically, SomethingElse.FromSomething() most definitely fits better. Although, the second option does require addition code to setup a factory, which could become unnecessarily compulsive.

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• Visual Studio Editor Choosing System

  This document gives an overview of how the Visual Studio editor choosing system works, and as an example discusses the XML Editors choosing system.  Visual Studio has the ability to associate multiple editors with a single a file extension.  For instance, .xaml files have multiple editor implementations associated with them. This raises the question of how Visual Studio chooses a specific editor implementation when asked to open a file. his document gives an overview of how the Visual Studio...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Visual Studio Editor Choosing System

  This document gives an overview of how the Visual Studio editor choosing system works, and as an example discusses the XML Editors choosing system.  Visual Studio has the ability to associate multiple editors with a single a file extension.  For instance, .xaml files have multiple editor implementations associated with them. This raises the question of how Visual Studio chooses a specific editor implementation when asked to open a file. his document gives an overview of how the Visual Studio...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Alerts are good, aren't they?

  - by fatherjack

  It is accepted best practise to set some alerts on every SQL instance you install. They aren't particularly well publicised but I have never seen any one not recommend setting up alerts for Error 823, 824 and 825. These alerts are focussed on successful access(IO) to the hard drives that SQL Server is using. If there are  any errors when reading or writing to the drives then one of these errors will be returned. Having the alerts on these errors means that any IO issues will be brought to the...(read more)

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• (Joomla 1.6) Template position descriptions don't refresh

  - by avanwieringen

  I want to change a description of a template position, so when I go to Admin-Extensions-Module Manager I see a different description of a module position in the position list when I edit a module. However, when I change (for instance) the template 'beez_20' and want to rename the name of the position 'debug', I change the description (TPL_BEEZ_20_POSITION_DEBUG) in the language file 'languages\en-GB\en-GB.tpl_beez_20.sys.ini' to something different, say 'Abracadabra'. However, the changes don't appear in the position list and I can find no reference whatsoever of how or when the ini files are read or maybe cached. Does anyone has a clue?

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• New perspectives in a SPARC/virtualization/cloud session at the Oracle OpenWorld

  - by Karoly Vegh

  Attending Oracle OpenWorld? You definitely should.  If you do, come see me at the "Breakthrough in Private Cloud Management on SPARC T-Series Servers" session on Wednesday at 11:45 in Moscone South 270, the right session to get the consolidation discussion running at lunch :)  I am of course going to talk about Oracle VM for SPARC (former LDoms), the performance overhead impact of virtualization, the importance of data security in the cloud, instance separation and the open potentials of verified platform and cost savings.  For more details:  https://oracleus.activeevents.com/connect/sessionDetail.ww?SESSION_ID=2590 See you there! 

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• In a 2D tile-based game, how should NPCs and tiles reference each other?

  - by lezebulon

  I'm making a tile engine for 2D games (seen from the top). Basically the world is composed of a grid of tiles. Now I want to put for instance NPCs that can move on the map. What do you think is best: 1) each tile has a pointer to the NPC that is on its tile, or a NULL pointer 2) having a list of NPCs, and they have the coordinates of the tile they are on. 3) something else? 1) is faster for collision detection but it would use much more memory space and it is slower to find all NPCs in a map. 2) is the opposite. thanks

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• Are ZFS snapshots + S3 a viable backup system for several VMs and general fileserver storage?

  - by AllanA

  I've been tasked with setting up a backup system for my small office (around 12 people). Most of our production stuff is on the AWS cloud, so what I need to back up are some small office/development files (under 100G right now), plus our operational VMs and development, which round out to a bit under 1T. I just need something reliable, convenient, and straightforward. I'm comfortable with Linux, FreeBSD, and to some extent Solaris 10, so I'm leaning toward a full server rather than an appliance system ala Openfiler or FreeNAS. What I'm contemplating is a small fileserver for general storage and nightly backups of the virtual machines, followed up by an offsite backup to Amazon's S3 storage service. It'd be the usual incremental backups nightly and full backup weekly. My question is if using ZFS snapshots, both locally and dumped to S3 via 'zfs send [-i]', is a viable backup tool? Or should I stick to using Duplicity, or some other method entirely? ZFS snapshots on the internal fileserver/backup machine sound like a perfect way to provide quick and convenient data recovery, so I'm likely to go with that for local redundancy. (If you folks see scenarios where relying on ZFS snapshots would be worse than a more traditional archiving backup, feel free to convince me.) But are snapshots flexible enough to lean on for recovery from the loss of my backup server? Or am I better off with something more traditional? (feel free to recommend free or commercial backup solutions you favor.)

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• New Oracle Cloud support in OEPE

  - by gstachni

  Oracle Enterprise Pack for Eclipse 12c (12.1.1.1.1) includes updated support for development with the Java Cloud Service. Users can now do iterative development against their Java Cloud Service instance in addition to testing against local and remote WebLogic Server installations. Some details of the cloud tools are below: Templates and wizards to create projects and server configurations for Oracle Java Cloud Service Develop applications to run and deploy to the cloud, including Oracle ADF. Check cloud server runtime and deployment logs in new log analyzers Test applications before deployment with integrated whitelist scans. Whitelist tools support as-you-type validation, project build validation, and on demand scans to highlight coding violations. Errors are reported in application source, the Problems view, and a new Whitelist violations view. Access the Oracle Public Cloud administrative consoles directly from within Eclipse.

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• How to get the Time Difference in C# .net

  - by Aamir Hasan

  A DateTime instance stores both date and time information. The DateTime class can be found in the System namespace.In order to retrieve the current system time, we can use the static property Now of the DateTime class.In this Example i have shown, how to calculate the difference between two DateTime objects using C# syntax. DateTime startTime; DateTime endTime;            startTime = Convert.ToDateTime("12:12 AM");            endTime = Convert.ToDateTime("1:12 AM");            var timeDifference = new TimeSpan(endTime.Ticks - startTime.Ticks);Response.Write("Time difference in hours is " + timeDifference.Hours);Link:http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

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• hotkeys do not work sometimes in ubuntu 12.04

  - by stepank

  I use Ubuntu 12.04 with Unity 2D and I've stumbled upon this issue: sometimes shortcut keys stop working in some windows. For instance, I have these windows opened usually: Google Chrome, Terminal, Skype, Pidgin. Sometimes everything is OK and shortcuts work no matter what window I hit them from, however, hotkeys hit from Skype (more often) or Pidgin (less often) do not work, but they still work from Terminal or Google Chrome. Moreover, not all hotkeys are affected, the problem holds only for locking the computer (Ctrl + Alt + L) and other custom shortcuts like executing some command or launching a program (I used zenity --entry with [Super | Ctrl] + [some letter: K, N, etc] for testing). Does anyone have a clue what is causing the problem and how to fix it?

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• Feed Reader Fix

  - by Geertjan

  In the FeedReader sample (available in the New Projects window), there's this piece of code: private static Feed getFeed(Node node) { InstanceCookie ck = node.getLookup().lookup(InstanceCookie.class); if (ck == null) { throw new IllegalStateException("Bogus file in feeds folder: " + node.getLookup().lookup(FileObject.class)); } try { return (Feed) ck.instanceCreate(); } catch (ClassNotFoundException ex) { Exceptions.printStackTrace(ex); } catch (IOException ex) { Exceptions.printStackTrace(ex); } return null; } Since 7.1, for some reason, the above doesn't work. What does work, and is simpler, is this, instead of the above: private static Feed getFeed(Node node) { Feed f = FileUtil.getConfigObject("RssFeeds/sample.instance", Feed.class); if (f == null) { throw new IllegalStateException("Bogus file in feeds folder: " + node.getLookup().lookup(FileObject.class)); } return f; } So, the code needs to be fixed in the sample.

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• List of backlinks to a specific website, listed by decreasing PageRank

  - by Nicolas Raoul

  With backlinkwatch.com I can get a list of pages that link to a particular website. Unfortunately, it lists tons of obscure blogs and small forums, it has hard to find what link is really important. Is there a similar service, where links would be displayed sorted by "importance"? For instance, a link New York Times would be shown at the top of the list, while links in small blogs would not appear before a few pages. "Importance" can be subjective, so I suggest using the PageRank, but other metrics could be fine too.

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• How do I configure multiple domain names on my IIS server? [closed]

  - by Dillie-O

  We have a few websites that we are running on one instance of IIS that need to be mapped for each of their domain names. For example. Site A has the domain name coolness.com Site B has the domain name 6to8Weeks.com Site C has the domain name PhatTech.com When I look at the "Web Site Identification" section of the IIS configuration window, I notice that I can specify an IP address and port, but if I click the Advanced button, I can also configure the site based on host header values as well. How do I configure each site in IIS? Ideally I would like them to all be able to listen to port 80, so I don't have weird URLs, but I'm not sure if I do this using headers, IP addresses, both, or something else.

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• Watch out for a trailing slash on $ORACLE_HOME

  - by user12620111

  Watch out for a trailing slash on $ORACLE_HOME oracle$ export ORACLE_HOME=/u01/app/11.2.0.3/grid/ oracle$ ORACLE_SID=+ASM1 oracle$ sqlplus / as sysasm SQL*Plus: Release 11.2.0.3.0 Production on Thu Mar 29 13:04:01 2012 Copyright (c) 1982, 2011, Oracle.  All rights reserved. Connected to an idle instance. SQL> oracle$ export ORACLE_HOME=/u01/app/11.2.0.3/grid oracle$ ORACLE_SID=+ASM1 oracle$ sqlplus / as sysasm SQL*Plus: Release 11.2.0.3.0 Production on Thu Mar 29 13:04:44 2012 Copyright (c) 1982, 2011, Oracle.  All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options SQL>

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• Programming language for simple program?

  - by jamherst

  I am wondering about which programming languages people see fit to create a program idea that I had. I am looking to create a fairly simple program whose main functions are adding to, managing, and searching through a database of people, all through a polished GUI. It will be for use in the business world, so I think Windows would be the priority, but Mac and Linux support wouldn't be bad. Also, eventually I would like to add the ability for an instance of one program on a computer to interact with other instances on the same network, mainly through the sharing of a database. Most of my experience is in Java, but I don't particularly like the appearance of Java GUIs, so I'm looking for an alternative. I noticed that a lot of people have suggested C++ or C# in similar posts, so what are some of the advantages/disadvantages of one or both if that is your suggestion. Thanks for any help in advance.

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• what is the Best way to learn object oriented principles

  - by Mike

  I am interesed in OOP principles and i found lots of documentations and books about it, for instance in C++, Java, .NET, PHP and so on, but if i only want to learn OOP principle, differences and not in language, what can i do? i want a good documentation, not just like a whole book about something except OOP :) specific answers, how it works, main features, pictures, or videos, or forum, or even stack... in every time I began studying i read a whole history of programming, computer science, software development and bla bla... i need specific answers, if it is possible i really need to learn, i need examples and exercises thanks in advance

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• css - use universal '*' selector vs. html or body selector?

  - by Michael Durrant

  Applying styles to the body tag will be applied to the whole page, so body { font-family: Verdana } will be applied to the whole page. This could also be done with * {font-family: Verdana} which would apply to all elements and so would seem to have the same effect. I understand the principle that in the first instance the style is being applied to one tag, body for the whole page whereas in the second example the font is being applied against each individual html elements. What I am asking is what is the practical difference in doing that, what are the implications and what is a reason, situation or best practice that leads to using one over another. One side-effect is certainly speed (+1 Rob). I am most interested in the actual reason to choose one over the other in terms of functionality.

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• How to create reproducible probability in map generation?

  - by nickbadal

  So for my game, I'm using perlin noise to generate regions of my map (water/land, forest/grass) but I'd also like to create some probability based generation too. For instance: if(nextInt(10) > 2 && tile.adjacentTo(Type.WATER)) tile.setType(Type.SAND); This works fine, and is even reproduceable (based on a common seed) if the nextInt() calls are always in the same order. The issue is that in my game, the world is generated on demand, based on the player's location. This means, that if I explore the map differently, and the chunks of the map are generated in a different order, the randomness is no longer consistent. How can I get this sort of randomness to be consistent, independent of call order? Thanks in advance :)

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• Avoid overwriting of logs

  - by Koppar

  What usually happens is, the logs get filled up and begin getting overwritten, which makes them useless. To avoid it, use these 2 properties in the logging.properties file to suit your requirement: java.util.logging.FileHandler.count  = x (it is 1 by default, increase it to a bigger value) This number specifies the number of log files that can be created before overwriting starts. For instance, if you set it to 5, java0.log, java1.log ... java5.log will be created to log details so more information can be captured Likewise, java.util.logging.FileHandler.limit  would specify the size of each log.

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• June 14th Webcast: Using Personalization in Oracle eAM

  - by Oracle_EBS

  ADVISOR WEBCAST: Using Personalization in Oracle eAMPRODUCT FAMILY: Enterprise Asset Management June 14, 2012 at 11 am ET, 9 am MT, 8 am PT Personalization is the ability within an E-Business Suite instance to make changes to the look and behavior of OA Framework-based pages without programming (and, therefore, upgradeable!).TOPICS WILL INCLUDE: Oracle eAM customers have leveraged Personalization to address many of the following use cases: making a non-mandatory field mandatory on a Work Order adding a new field to the header region entering the specifications for a new field disabling a field to prevent user entry adding Asset Description to Create Work Request Page viewing Asset Hierarchy in Create Work Request Page setting Auto Request Material Flag to yes by default A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services. Current Schedule can be found on Note 740966.1 Post Presentation Recordings can be found on Note 740964.1

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