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  • Diagnosing high CPU waiting

    - by Will
    I have a monitoring server that is running icinga/collectd/graphite with about 50 hosts. I have noticed high load/slugging performance on the box. If you take a look at top, you'll see: Cpu(s): 0.6%us, 0.2%sy, 0.0%ni, 7.6%id, 23.4%wa, 0.0%hi, 0.2%si, 0.0%st Notice the HUGE %wa value, which as far as I know means a network or disk bottleneck. ifconfig shows no dropping packets and there's not a ton of bandwidth going on, so that leaves disk issues, right? There's not a lot of disk writing going on either...iotop is reporting we're only writing a little over 1 MB per second and the RAID tool reports everything is A-OK and write caching is enabled. How do I go about trying to figure out how to fix this? UPDATE: iostat -x output is: avg-cpu: %user %nice %system %iowait %steal %idle 0.62 0.10 0.31 9.65 0.00 89.31 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.21 33.34 83.55 16.54 1599.94 399.07 19.97 43.21 416.98 3.71 37.13

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  • Windows Live SkyDrive: How To Move or Copy Files Between Folders

    - by Gopinath
    Microsoft has very simple and easy to use interface to move files between folders in Windows Operating system. But their own cloud storage service,Windows Live SkyDrive, complicated these simple and daily used operations. We need a guide to figure out how to perform basic copy/move operations. Couple of years ago we wrote about moving files between folders in old version of SkyDrive but the guide does not hold good today as SkyDrive has gone through many user interface changes in the recent past. Today one of our readers asked us how to move/copy files in the latest version of SkyDrive and here are the steps to be followed 1. Login to your Windows Live SkyDrive 2. Select the file you want to Move or Copy by clicking on the information icon (see 2 in below image) 3. After selecting the information icon, expand Information section displayed on the right side panel to access Move and Copy options (see 3 in the below image). 4. To move the selected file to another folder, select Move option and Sky Drive will guide you through folder selection user interface for choosing the target folder. 5. Once you navigate to the target folder where you want to move the file click on “Move this file into <<Target Folder>>”. 6. You are done. Dear Microsoft, SkyDrive provides us tonnes of free storage but please make it’s user interface a bit better so that we don’t need to write guides to perform basic operations. Hope you listen to your customers. This article titled,Windows Live SkyDrive: How To Move or Copy Files Between Folders, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Unable to use NTFS partition for Dropbox in Linux

    - by Cristian
    Dropbox won't let me choose the sync folder inside a NTFS partition. First thought I had was mounting and its permissions (the Dropbox installer does let me choose my linux home as the Dropbox home). After searching and trying several other lines, the partition is mounted via fstab with these settings: /dev/sda5 /mnt/documents ntfs-3g uid=1000,gid=100,dmask=027,fmask=137 0 0 I can read and write in the partition, here is a ls output: 24 drwxr-x--- 1 tuxcayc users 24576 Sep 2 06:42 documents I'm using an Arch-based distro (Manjaro) and Dropbox installed via yaourt. I guess it's still some issue with mounting permissions. Any help is appreciated, Thanks.

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  • Where should I put bindings for dependency injection?

    - by Mike G
    I'm new to dependency injection and though I've really liked it so far, I'm not sure where bindings should go. I'm using Guice in Java, so some of what I say might be specific to just Guice. As I see it, there's two options: Accompanying the class(s) its needed for. Then, just write install(OtherClassModule.class) in whatever other modules want to be able to use said class. As I see it, the advantage of this is that classes that want to use it (or manage classes that want to use it) don't need to know any of the implementation detail. The issue I see is that what if two classes want to use two different versions of the same class? There's a lot of customization possible because of DI and this seems to restrict it a lot. Implemented in the module of the class(s) its needed for. It's the flip of what I said above. Now you have customization, but not encapsulation. Is there a third option? Am I misunderstanding something obvious? What's the best practice?

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  • Haskell: Best tools to validate textual input?

    - by Ana
    In Haskell, there are a few different options to "parsing text". I know of Alex & Happy, Parsec and Attoparsec. Probably some others. I'd like to put together a library where the user can input pieces of a URL (scheme e.g. HTTP, hostname, username, port, path, query, etc.) I'd like to validate the pieces according to the ABNF specified in RFC 3986. In other words, I'd like to put together a set of functions such as: validateScheme :: String -> Bool validateUsername :: String -> Bool validatePassword :: String -> Bool validateAuthority :: String -> Bool validatePath :: String -> Bool validateQuery :: String -> Bool What is the most appropriate tool to use to write these functions? Alex's regexps is very concise, but it's a tokenizer and doesn't straightforwardly allow you to parse using specific rules, so it's not quite what I'm looking for, but perhaps it can be wrangled into doing this easily. I've written Parsec code that does some of the above, but it looks very different from the original ABNF and unnecessarily long. So, there must be an easier and/or more appropriate way. Recommendations?

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  • Access losing db connections

    - by Dwight T
    I have a weird problem going on at work. People have been using MS Access to connect to sql server db and lately people are getting sporadic problems with connecting to the servers. It's not always the same users and it's not always a problem, which makes it a real pain to try to solve. One example of a related problem. A person has a linked table to a table and she would filter the table or write a query on the table to return where itemsku = 'ABCD1234'. It would return one record but the ItemSku LMKN7486 and everytime it would return the wrong record but consistently the wrong record so itemsku abcd1234 always returned LMNK7486 One would think it might be a driver problem, but it also could be a user problem. Just posting the question to see if anyone else has had similar senerios. Thanks

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  • What is the current state of development for the FLAC codec?

    - by TwentyMiles
    I have a pretty large collection of FLAC files created from my CD collection. I love the FLAC format and the sound quality that you can get from it. Lately, however, I've been trying to write a few tools to manipulate the files and I've been noticing what seems to be a stagnation of the community around the codec. Some of the links on the official FLAC page point to thing that are no longer relevant (7digital, for example, appears to no longer sell FLAC encoded songs). It's pretty hard to find hardware players that support FLAC any more (most noticeably it's not present on lower end players when it used to be, and playback is absent on Android). Programming language tools (Java and .NET libraries) are at best old, and at worst unfinished. What's the current state of FLAC development? Has it been replaced by another codec?

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  • Run .sh file in linux machine via putty

    - by Prateek
    I want run an .sh file which take an argument in a Linux machine. I'm using plink.exe to execute this .sh file from a windows machine. But I don't know what to write in the batch file in order to run plink.exe which in turn executes the .sh file and this file arguement. I have written following batch command: @echo off start C:\Users\Prateek\Desktop\PLINK.EXE -ssh -P 22 user@host -pw password sh -x "/home/user/copy.sh" On executing it, I get: + echo '' + echo 'Enter partner id' Enter partner id + read pid : Actually 'Enter partner id' is the argument, which I need to pass.

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  • Are you a GPGPU developer? Participate in our UX study

    - by Daniel Moth
    You know that I work on the parallel debugger in Visual Studio and I've talked about GPGPU before and I have also mentioned UX. Below is a request from my UX colleagues that pulls all of it together. If you write and debug parallel code that uses GPUs for non-graphical, computationally intensive operations keep reading. The Microsoft Visual Studio Parallel Computing team is seeking developers for a 90-minute research study. The study will take place via LiveMeeting or at a usability lab in Redmond, depending on your preference. We will walk you through an example of debugging GPGPU code in Visual Studio with you giving us step-by-step feedback. ("Is this what you would you expect?", "Are we showing you the things that would help you?", "How would you improve this") The walkthrough utilizes a “paper” version of our current design. After the walkthrough, we would then show you some additional design ideas and seek your input on various design tradeoffs. Are you interested or know someone who might be a good fit? Let us know at this address: [email protected]. Those who participate (and those who referred them), will receive a gratuity item from a list of current Microsoft products. Comments about this post welcome at the original blog.

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  • Why do programmers seem to be such bad spellers?

    - by Joel Etherton
    Programming languages are very precise tools based on explicit grammars. They're very picky, and when being used they require an exacting amount of detail. C#, for instance, is case sensitive so even getting the case of an argument wrong will cause an error. Questions asked all over the StackExchange are replete with misspellings, grammatical errors, and other problems that seem to indicate a lack of attention to detail when it comes to the language itself. Now, I understand there are a lot of programmers out there whose native language is not English, and I am not directing this question (rant one might say) at them. I'm referring to the individuals who are clearly from an English speaking background who refuse to pay attention to these simple details. I am not perfect by any means, but I try to use the language correctly so that my meaning will be understood correctly. I find programmers misspelling variable names, classes, and all manner of words in any kind of technical documentation they might write. I have had to withstand code where I am repeatedly referring to the subit[sic] button or HttpWebResponse reponse. The general complaint about bad spelling is one thing, and it will always be there. I accept that. But my question/comment is about the proclivity of bad spelling within the programming community. I would think that people who deal with such exacting tools to be more naturally predisposed towards proper spelling. Yet this doesn't seem to be the case.

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  • Microsoft Silverlight Analytics Framework - Day 2 Part 2 of MIX 2010

    - by GeekAgilistMercenary
    I went to the session on Microsoft Silverlight Analytics Framework (MSAF) today while here at MIX 2010.  It was a great walk through the features, ideas, and what the end goal is.  Michael Scherotter did a great job of lining up the ideas, intentions, and the functional ideas behind the framework. The framework is built around the Silverlight Behaviors.  If you aren't sure what behaviors are, check out these entries from Nikhilk.net Silverlight Behaviors, Silverlight 3 Drag Behavior, An Introduction to Behaviors, Triggers, and Actions, and of course the MSDN Documentation on the matter. Some of the key features of the framework is to support out-of-browser scenarios, which works perfectly with out Webtrends DX Web Services.  Offline scenarios, which again, we have worked toward supporting at Webtrends DC Web Services via caching and other criteria as needed.  Another feature that I was really stoked about is the Microsoft Expression Blend integration that removes the need for coding, thus simplifying the addition of analytics components based on events or other actions within a Silverlight Application.  This framework also easily supports A/B Testing (again, something we do quit a bit of at Webtrends with Webtrends Optimize. The last thing I really wanted to point out was the control support that this framework has support in already from Telerik RadControls, Smooth Streaming Media Element, and Microsoft Silverlight Media Framework Player 1.0.  These are implemented with behaviors and handlers exposed via MEF (Managed Extensibility Framework). All in all, great second day, great analytics framework for Silverlight, and great presentation.  Until tomorrow, adieu. For this original entry and all sorts of other technical gibberish I write, check out my other blog Agilist Mercenary.

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  • How do I compile a Wikipedia lens and install?

    - by user49523
    I read a tutorial about how to compile and install a Wikipedia lens, but it didn't work. The tutorial sounds easy - i just copied and pasted to the file that was suppose to edit. I have tried some times and here are 2 edits edit 1: import logging import optparse import gettext from gettext import gettext as _ gettext.textdomain('wikipedia') from singlet.lens import SingleScopeLens, IconViewCategory, ListViewCategory from wikipedia import wikipediaconfig import urllib2 import simplejson class WikipediaLens(SingleScopeLens): wiki = "http://en.wikipedia.org" def wikipedia_query(self,search): try: search = search.replace(" ", "|") url = ("%s/w/api.php?action=opensearch&limit=25&format=json&search=%s" % (self.wiki, search)) results = simplejson.loads(urllib2.urlopen(url).read()) print "Searching Wikipedia" return results[1] except (IOError, KeyError, urllib2.URLError, urllib2.HTTPError, simplejson.JSONDecodeError): print "Error : Unable to search Wikipedia" return [] class Meta: name = 'Wikipedia' description = 'Wikipedia Lens' search_hint = 'Search Wikipedia' icon = 'wikipedia.svg' search_on_blank=True # TODO: Add your categories articles_category = ListViewCategory("Articles", "dialog-information-symbolic") def search(self, search, results): for article in self.wikipedia_query(search): results.append("%s/wiki/%s" % (self.wiki, article), "http://upload.wikimedia.org/wikipedia/commons/6/63/Wikipedia-logo.png", self.articles_category, "text/html", article, "Wikipedia Article", "%s/wiki/%s" % (self.wiki, article)) pass edit 2: import urllib2 import simplejson import logging import optparse import gettext from gettext import gettext as _ gettext.textdomain('wikipediaa') from singlet.lens import SingleScopeLens, IconViewCategory, ListViewCategory from wikipediaa import wikipediaaconfig class WikipediaaLens(SingleScopeLens): wiki = "http://en.wikipedia.org" def wikipedia_query(self,search): try: search = search.replace(" ", "|") url = ("%s/w/api.php?action=opensearch&limit=25&format=json&search=%s" % (self.wiki, search)) results = simplejson.loads(urllib2.urlopen(url).read()) print "Searching Wikipedia" return results[1] except (IOError, KeyError, urllib2.URLError, urllib2.HTTPError, simplejson.JSONDecodeError): print "Error : Unable to search Wikipedia" return [] def search(self, search, results): for article in self.wikipedia_query(search): results.append("%s/wiki/%s" % (self.wiki, article), "http://upload.wikimedia.org/wikipedia/commons/6/63/Wikipedia-logo.png", self.articles_category, "text/html", article, "Wikipedia Article", "%s/wiki/%s" % (self.wiki, article)) pass class Meta: name = 'Wikipedia' description = 'Wikipedia Lens' search_hint = 'Search Wikipedia' icon = 'wikipedia.svg' search_on_blank=True # TODO: Add your categories articles_category = ListViewCategory("Articles", "dialog-information-symbolic") def search(self, search, results): # TODO: Add your search results results.append('https://wiki.ubuntu.com/Unity/Lenses/Singlet', 'ubuntu-logo', self.example_category, "text/html", 'Learn More', 'Find out how to write your Unity Lens', 'https://wiki.ubuntu.com/Unity/Lenses/Singlet') pass so .. what can i change in the edit ? (if anybody give me the entire edit file edited i will appreciate)

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  • New cloud development workflow using Github, Cloud9ide and CloudFoundry.

    - by weng
    So time is changing towards cloud development/computing. I'm trying to get the new "cloud" workflow based on the services I'm going to use: Github, Cloud9ide and CloudFoundry. Here is what is on my mind: Github acts like a central (main repo) just like yesterday's local filesystem. Every service will base it service upon this main repo. Workflow: Github: I create a new Github repo served as main repo for the project. Cloud9ide. I open my Github repo and write my tests and implementation (BDD/TDD). When I'm ready I save (commit) it to main repo on Github. X: A running instance of Jenkins detects someone has committed and fetches the latest commit, builds, deploys, tests (yeti and/or selenium) and reports if the tests were passed or not. If not, I make another commit til all tests are passing. X: I run the CloudFoundry commands to push the main Github repo to CloudFoundry's server and it will deploy my app automatically. What I'm still confused about is where this X environment will be. On a local server where I have to install Jenkins? Or could I install it on Cloud9ide (when java is supported) or will it be on another cloud service? Also, that X environment has to be able to fetch (clone) the Github repo and run the build scripts. And since the concept of Cloud9ide is very new and there haven't been any other predecessors I really wonder how the workflow will look like. We all know Github's workflow. We now know CloudFoundry's workflow (deploy/scale with a restful API/command line tool). But how Cloud9Ide will operate is still somewhat unclear to me. Someone on Cloud9ide mentioned that there will be buttons like deploy so I can deploy with one click. But that I guess will depend on what services that deploy process will hook up into etc. Could someone enlighten this cloud workflow topic and fill in the gaps. Thanks.

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  • Oracle Java Cloud Service - Platform as a Service for Your Java Applications

    - by GeneEun
    Oracle Java Cloud Service is an enterprise grade Platform as a Service for developing, testing, and deploying business applications. For Java developers, Java Cloud Service provides the power, flexibility, and performance of a true Java EE container in the cloud. Java Cloud Service delivers one of the key advantages of the Java platform, the ability to “write once, run anywhere”. Because of the standards-based approach, there's no need to worry that applications you build and deploy are forever locked into the Oracle Cloud.  In fact, you can use Java Cloud Service just as you would an on-premise Java EE environment and deploy your Java applications on a Java Cloud Service instance as-is. Provisioning of Java Cloud Service instances is self-service and takes only minutes, making access to Java environments both quick and easy. Java Cloud Service instances are also automatically associated with Oracle Database Cloud Service instances, so there's no complex setup involved in order to get a complete application environment up and running.If you're attending Oracle OpenWorld in San Francisco this week, I'm sure you've seen that there are many sessions covering Oracle Cloud services, including Java Cloud Service. Each session will provide a wealth of information, so I highly recommend you consult your conference schedule and try to check them out. In the meantime, here's a short video about Java Cloud Service. Enjoy!

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  • How to optimise Andengine's PathModifer (with singleton or pool)?

    - by Casla
    I am trying to build a game where the character find and follows a new path when a new destination is issued by the player, kinda like how units in RTS games work. This is done on a TMX map and I am using the A Star path finder utilities in Andengine to do this.David helped me on that: How can I change the path a sprite is following in real time? At the moment, every-time a new path is issued, I have to abandon the existing PathModifer and Path instances, and create new ones, and from what I read so far, creating new objects when you could re-use existing ones are a big waste for mobile applications. This is how I coded it at the moment: private void loadPathFound() { if (mAStarPath != null) { modifierPath = new org.andengine.entity.modifier.PathModifier.Path(mAStarPath.getLength()); /* replace the first node in the path as the player's current position */ modifierPath.to(player.convertLocalToSceneCoordinates(12, 31)[Constants.VERTEX_INDEX_X]-12, player.convertLocalToSceneCoordinates(12, 31)[Constants.VERTEX_INDEX_Y]-31); for (int i=1; i<mAStarPath.getLength(); i++) { modifierPath.to(mAStarPath.getX(i)*TILE_WIDTH, mAStarPath.getY(i)*TILE_HEIGHT); /* passing in the duration depended on the length of the path, so that the animation has a constant duration for every step */ player.registerEntityModifier(new PathModifier(modifierPath.getLength()/100, modifierPath, null, mIPathModifierListener)); } } The ideal implementation will be to always have just one object of PathModifer and just reset the destination of the path. But I don't know how you can apply the singleton patther on Andengine's PathModifer, there is no method to reset attribute of the path nor the pathModifer. So without re-write the PathModifer and the Path class, or use reflection, is there any other way to implement singleton PathModifer? Thanks for your help.

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  • Unexpected behavior in Bash

    - by cYrus
    From man bash: A simple command is a sequence of optional variable assignments followed by blank-separated words and redirections, and terminated by a control operator. The first word specifies the command to be executed, and is passed as argument zero. The remaining words are passed as arguments to the invoked command. So it's perfectly legal to write: foo=bar echo $foo but it doesn't work as I expect (it prints just a newline). It's quite strange to me since: $ foo=bar printenv foo=bar TERM=rxvt-unicode [...] Could someone please explain me where I'm doing wrong?

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  • Virtualbox and Serial Port permissions

    - by Pandincus
    I have a Windows XP Pro SP3 host machine running a Windows XP Pro SP3 guest machine. The host machine has one serial port, COM1, that I need to use in the guest machine. When I add the serial port to the guest machine and try to start it, I get the following error: Failed to start the virtual machine xxx Cannot open host device 'COM1' for read/write access. Check the permissions of that device (VERR_ACCESS_DENIED). Unknown error creating VM (VERR_ACCESS_DENIED). What are some of the things that might be causing this problem? How can I check "permissions" on a serial port?

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  • setup the git server in centos6.4 [on hold]

    - by hguser
    We have a server which using centos6.4. Now we want to make this server as the backup and the cvs server. We have ten user in our team. So I created ten accounts accordingly, then they can backup files to their own home directory using ftp. However I do not know how to setup the cvs, we preferred to use git. We want to implement this: Everyone can create git repositories in his home directory with read/write access using his account. Is this possible?

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  • Why do you hate Java? Is it the language or the framework? [closed]

    - by zneak
    According to you all, Java is the third most-hated language here. The two other most hated languages are PHP and VBScript. (It's quite funny how they stand together on the podium.) I'd like to make it known that the question mostly addresses people who don't like Java. I assume here a number of subjective opinions as facts because they're usually considered true among people who don't like Java, and I don't want to be convinced otherwise here. If you're a Java enthusiast, you might find this question frustrating. It's never been made clear if people hate Java itself, or if they hate it because of the framework, or if it's a mixture of the two. On a side you have the language, where you have: the "everything should be an object" philosophy, even in instances where it should obviously be something else (event handlers I'm pointing you); checked exceptions; the idea that all logic should be presented as methods and properties is a big no-no; the fact that "closures" created by anonymous types only include final variables and arguments, but will allow write access to any member of the parent class; a few more. On the other side, you have the JDK, with... its load of inconsistencies and overengineering; monolithic class hierarchies; meaningless base exceptions like IOException (though other frameworks have similar exception hierarchies); sluggish responsiveness even with Swing; a few more. My question is, do you think that, if either one (Java or the JDK) was taken alone, and the other was dropped in favor of something else, the new combination would be better? For instance, if you could use the C# syntax with the JDK (adapting get*/set* methods into properties, and interfaces with only one method into delegates), or the Java syntax with the .NET Framework (doing the inverse transformations), would things get better in your opinion?

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  • Why doesn't Python have a "flatten" function for lists?

    - by Hubro
    Erlang and Ruby both come with functions for flattening arrays. It seems like such a simple and useful tool to add to a language. One could do this: >>> mess = [[1, [2]], 3, [[[4, 5]], 6]] >>> mess.flatten() [1, 2, 3, 4, 5, 6] Or even: >>> import itertools >>> mess = [[1, [2]], 3, [[[4, 5]], 6]] >>> list(itertools.flatten(mess)) [1, 2, 3, 4, 5, 6] Instead, in Python, one has to go through the trouble of writing a function for flattening arrays from scratch. This seems silly to me, flattening arrays is such a common thing to do. It's like having to write a custom function for concatenating two arrays. I have Googled this fruitlessly, so I'm asking here; is there a particular reason why a mature language like Python 3, which comes with a hundred thousand various batteries included, doesn't provide a simple method of flattening arrays? Has the idea of including such a function been discussed and rejected at some point?

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  • Where did ULSTraceLog go to in the SharePoint 2010 Logging Database?

    - by Jan Tielens
    The Logging Database is one of the many new concepts that will make the life of many SharePoint administrators quite a bit more enjoyable. In SharePoint 2007 the Unified Logging System (ULS) logged all of its data to text files, typically found on your SharePoint server in 12\LOGS. We still have that in SharePoint 2010, but besides those text files, ULS can also write the data to a database! The advantages are obvious: easy to query, one central location for all servers in the farm, easy to build reports etc. You can find this ULS data in the SharePoint 2010 logging database (typically called WSS_Logging), in the view ULSTraceLog. Quite recently on one of my demo machines (standalone installation on Windows 7) I noticed the ULSTraceLog view was not available in the logging database. It turned out that there is a Timer Job that’s responsible for writing the data to the database, when the Timer Job hasn’t executed, the view is not there (the first time it executes, the view is created). Even more, the timer job was disabled, so the view would never be created, nor any data would be written to the database. If you encounter this situation as well, it’s quite easy to solve: Open the SharePoint Central Administration site Navigate to the Monitoring section Select Review Job Definitions Click on the job with the name Diagnostic Data Provider: Trace Log Click on the Enable button to enable it Optionally click on Run Now afterwards, to start it immediately There you go, the ULSTraceLog will be created and the ULS messages will appear in the database!

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  • Simple ADF page using BAM Data Control

    - by [email protected]
    var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-15829414-1"); pageTracker._trackPageview(); } catch(err) {} Purpose : In this blog I will walk you through very simple steps to create an ADF page using BAM data control connection.Details : Create the projectOpen JDeveloper (make sure you have installed the SOA extension for JDev)Create new Application using "Generic Application" template.Click on "Next"Shuttle  "ADF Faces" to right pane for the project technology.Click "Finish"Create a BAM connectionIn the resource palette click on "Folder->New Connection -> BAM"Enter the connection name and click "Next"Enter Connection details Click on "Test connection" and "Finish"Create the BAM Data Control Open the IDE connection created in above step.Drag and drop "Employees" to "Data controls" palette.Select "Flat Query" and Click "Finish".Create the View Create a new JSF page.From Data control Panel drag and drop "Employees->Query->ADF Read Only table"Right click and Run the page.

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  • Should one generally develop a client library for REST services to help prevent API breakages?

    - by BestPractices
    We have a project where UI code will be developed by the same team but in a different language (Python/Django) from the services layer (REST/Java). The code for each layer exits in different code repositories and which can follow different release cycles. I'm trying to come up with a process that will prevent/reduce breaking changes in the services layer from the perspective of the UI layer. I've thought to write integration tests at the UI layer level that we'll run whenever we build the UI or the services layer (we're using Jenkins as our CI tool to build the code which is in two Git repos) and if there are failures then something in the services layer broke and the commit is not accepted. Would it also be a good idea (is it a best practice?) to have the developer of the services layer create and maintain a client library for the REST service that exists in the UI layer that they will update whenever there is a breaking change in their Service API? Conceivably, we would then have the advantage of a statically-typed API that the UI code builds against. If the client library API changes, then the UI code won't compile (so we'll know sooner that there was a breaking change). I'd also still run the integration tests upon building the UI or services layer to further validate that the integration between UI and the service(s) still works.

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  • limit linux background flush (dirty pages)

    - by korkman
    Background flushing in linux happens when either too much written data is pending (adjustable via /proc/sys/vm/dirty_background_ratio) or a timeout for pending writes is reached (/proc/sys/vm/dirty_expire_centisecs). Unless another limit is being hit (/proc/sys/vm/dirty_ratio), more written data may be cached. Further writes will block. In theory, this should create a background process writing out dirty pages without disturbing other processes. In practice, it does disturb any process doing uncached reading or synchronous writing. Badly. This is because the background flush actually writes at 100% device speed and any other device requests at this time will be delayed (because all queues and write-caches on the road are filled). Is there any way to limit the amount of requests per second the flushing process performs, or otherwise effectively prioritize other device I/O?

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  • eMail with Conflicting Headers not blocked in MS365

    - by John Meredith Langstaff
    On occasion, a company receives eMail with two header fields (“Received” and “From”) containing data that contradict each other drastically. Should they not expect their anti-spam system to flag or block items with contradictions in these fields? For example, they received an eMail which contained [almost exactly] these two headers: Received: from [107.52.51.26] by web315204.mail.ne1.yahoo.com via HTTP; Mon,28 Oct 2013 04:28:04 PDT From: Barry Smith [email protected] Obviously, eMail from an @att.net address isn’t coming from a server on the domain yahoo.com, and Yahoo isn’t forwarding AT&T’s eMail. There were no other headers indicating that the item was sent “OnBehalfOf”, or “Forwarded-by”, or “By_Proxy” or any other such. Should I write a utility to scan incoming eMail for such conflicts, or look more closely at their spam filtering to block this kind of eMail? Their eMail system is Hosted Exchange on MS-365. My central question is, where specifically do I look in MS-365 to get this type of conflicted eMail blocked?

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