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  • What is shrink_slab, and why is it showing up in /var/log/messages?

    - by Steve Kehlet
    I'm investigating some application issues on a Linux system and noticed this around the time of the most recent problem, but not close enough to be definitively related: Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-155456000 Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-157859400 Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-157833400 Jun 8 06:20:23 localhost kernel: shrink_slab: nr=-284172800 What is this? Googling isn't helping, I get that it's something with VM, but why is it suddenly showing up in /var/log/messages? Edit: I take it it's showing this because the number of pages it could free ("nr") is negative. Which is presumably a bad thing. I found patches for newer kernels that display a more useful message to this effect. Still not sure what this means though, or what I need to do about it.

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  • Manipulate data in the DB query or in the code

    - by DrDro
    How do you decide on which side you perform your data manipulation when you can either do it in the code or in the query ? When you need to display a date in a specific format for example. Do you retrieve the desired format directly in the sql query or you retrieve the date then format it through the code ? What helps you to decide : performance, best practice, preference in SQL vs the code language, complexity of the task... ?

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  • how to send data to server with the same TCP connection using ajax or JS trick

    - by zack
    Hi, I know how to keep a connection indifinetely open server side to stream continuously data to javascript. BUT I do not know how to send data reusing the same TCP from browser to server. so there is not the 3 way handshake and only 2 tcp packets. I know it is possible but I do not how to do it : use xmlhttprequest? or script tag ajax ? can you tell me how to do it. thank you very much

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  • Twitter feed only load periodically

    - by William
    I've tried many jQuery twitter feed plugins and they all seem to suffer from the same problem. Nothing loads for unless I refresh several times and then it will load once. I then need to refresh several more times before it loads again. Is there some sort of limitation on Twitters side or does this only happen to me? Example - This is the test site but it is basically ready to go live except for this issue.

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  • Hold a network connection although IP address change

    - by rursw1
    Hi, Is it possible to hold an open TCP connection with a client, while the IP address of the client is externally changed? For example, the connection is establishes against address X, but somewhen while the connection is open, the client-side user asks for IP renew and gets another IP address. Can the connection remains alive in this case? Thanks in advance.

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  • How do I prevent ImageMagick convert from scaling images *up*?

    - by Kyle
    I'm using ImageMagick's convert tool to generate image thumbnails for a web application. I'm using notation like so: 600x600> The images are indeed scaled to 600px wide/tall (depending on the longer side) and proportions are properly maintained, however images less than 600px in either direction are scaled up — this behavior is not desired. Is there a way to prevent convert from scaling images up if the destination dimensions both exceed the original image size?

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  • uiview rotation reset size problem

    - by user564968
    i have uiview i have rotate view left and right side ...i m transform view ...but problem is view fream is not changing... my code is like this ... CGAffineTransform tRotate45 = CGAffineTransformMakeRotation(-1.57); self.view.transform = tRotate45; imageScrollView.contentSize = CGSizeMake(480, 320); self.view.frame =[[UIView alloc] ] CGRectMake(0, 0, 480, 320); view is showing proper how can i adjust this ...

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  • Windows always open top left

    - by BobTodd
    I find this a highly annoying "feature" on a wide screen monitor that my mostly used apps - terminal and gedit always open directly under the top-left corner of my screen and I have to drag them to my eye position each and every-time. I have tried installing the CompizConfig Settings Manager and using the feature to position windows centre, but this has had no effect - the force feature here isn't working for me either. I can use e.g. gnome-terminal --geometry=140x50+50+50 for the terminal but this doesn't work for gedit. Any ideas? Thanks

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  • javascript spell checker

    - by user329755
    Hi, I am integrating Pure spell checker on my rich text box. The way it currently works is that it puts the cylinder object on the page in an Iframe. I want that to read from a file and the file will be located at server side. Anyone with any clue please help Thanks

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  • ubuntu boots into gnu grub 1.99

    - by greenish
    I've tried set root=(hd0,2) chainloader +1 boot set root=(hd0,2) linux /boot/vmlinuz... and the loopback (loop0) /ubuntu/disks/root.disk command etc. When I try the boot command it tells me there's no kernel and when I boot Win7 (it's a dual boot) the root.disk says 0kb. nothing boots from the live usb I've made and I've tried to use programs to mount the partitions to no effect - they only show me what's on my windows file drives. I've got some really important docs on the linux harddrive I need to get to. any ideas?

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  • Looking for downloadable demo of a .Net service accessed through a pure JavaScript client, without r

    - by blueberryfields
    I am told that the configuration below is possible, but have had significant difficulty in finding instructions on how to set it up. While I'm trying to muddle my way through this on my own, maybe stack-overflow knows of better sources for documentation: I am looking for a walkthrough, including a downloadable, working example, for setting up the following configuration: Server-side .net application (For .net 2.0 or higher), installed/deployed as a windows' service (that is, not served through IIS), and accessed by a client tool that is completely implemented in JavaScript.

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  • Someone used my postfix smtp (port 25) to send spam mails to me

    - by Andreas
    This week, someone started to send spam-mails through my postfix-smtp access (I verified by logging in through telnet from an arbitrary pc and sending mails with any ids myself) on my server, with recipient and target being [email protected]. Since I have a catchall and mail-fowarding to my google account, I received all those (many) mails. After a lot of configuration (I lost track of what change did what, going through dozends of topics here and over the net) that hole seems fixed. Still, what hapened? Does port 25 need to be open and accepting for my catchall to work? What configuration did I do wrong? I remember the first thing I changed (that had an effect) was the inet_interface setting in main.cf, only later to find out that if this does not say "all", my mail to mydomain.com does not get forwarded any more.

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  • Change base language of Windows 8 Installer

    - by Firedragon
    I have access to Dreamspark and Windows 8. When I picked the version I picked English which is fine, but it is US English however I realised I should have picked UK English instead. You are only allowed one version so i cannot switch it. Now, I can change the language pack later to UK English but in the language bar US English is always listed and seems impossible to remove and system restore reverts to US English. Is there a way to fully change the base language to UK in the installer, so in effect makin the installer offer US and UK English, or just UK English as if I had chosen the correct version?

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  • C# some sort of plugin system

    - by nLL
    Hi, I am a mobile web developer and trying to monetize my traffic with mobile ad services and i have a problem. First of all to get most of out of your ads you usually need to do server side request to advert company's servers and there are quite few ad services. Problem starts when you want to use them in one site. All have different approaches to server side calls and trying to maintain and implement those ad codes becomes pain after a while. So I decided to write a class system where i can simply create methods for every company and upload it to my site. So far i have public Advert class public AdPublisher class with GetAd method that returns an Advert public Adservice class that has Service names as enum I also have converted server request codes of all ad services i use to classes. It works ok but I want to be able to create an ad service class upload it so that asp.net app can import/recognize it automatically like a plugin system. As I am new to .net I have no idea where to start or how to do it. To make thing clear here are my classes namespace Mobile.Publisher { public class AdPublisher { public AdPublisher() { IsTest = false; } public bool IsTest { get; set; } public HttpRequest CurrentVisitorRequestInfo { get; set; } public Advert GetAd(AdService service) { Advert returnAd = new Advert(); returnAd.Success = true; if (this.CurrentVisitorRequestInfo == null) { throw new Exception("CurrentVisitorRequestInfo for AdPublisher not set!"); } if (service == null) { throw new Exception("AdService not set!"); } if (service.ServiceName == AdServices.Admob) { returnAd.ReturnedAd = AdmobAds("000000"); } return returnAd; } } public enum AdServices { Admob, ServiceB, ServiceC } public class Advert { public bool Success { get; set; } public string ReturnedAd { get; set; } } public partial class AdService { public AdServices ServiceName { get; set; } public string PublisherOrSiteId { get; set; } public string ZoneOrChannelId { get; set; } } private string AdmobAds(string publisherid) { //snip return "test" } } Basically i want to be able to add another ad service and code like private string AdmobAds(string publisherid){ } So that it can be imported and recognised as ad service. I hope i was clear enough

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  • Is there a template engine for Node.js?

    - by Seb
    I'm kind of falling in love with Node.js not because you write app code in javascript but because of its performance. I really don't care a lot about how beautiful a server side language might be but how much requests per second it can handle. So anyway I'm looking forward to experiment building an entire webapp using Node.js (and going back to the actual question) is there a template engine similar to let's say the django template engine or something similar (that at least allows you to extend base templates) available for Node.js?

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  • ProFTPD Virtual User Directory

    - by Nik
    Alright, I'm trying to replicate a web hosting company's basic setup here by authenticating virtual users via SQL and redirect/jail them to their directory. I've accomplished most of the goals here, with the exception of redirect/jailing them to their directory. The directories are stored in /home/ftp and that's what DefaultRoot is set to. I want each individual user to have and be jailed into their own directory. It doesn't appear that setting homedir in SQL has any effect. Upon logging into FTP with any user, it logs into the DefaultRoot with no directory jailing or redirect. How do I accomplish this last task?

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