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  • AJAX Web Application Development Explained

    The concept of combining Asynchronous Javascript with XML to fulfill the purpose of development of highly interactive web applications is called AJAX. Credible examples of the popularity of this tech... [Author: Grey Matter India - Web Design and Development - April 07, 2010]

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  • Should I completely turn off swap for linux webserver?

    - by Poma
    Recently my friend told me that it is a good idea to turn off swap on linux webservers with enough memory. My server has 12 GB and currently uses 4GB (not counting cache and buffers) under peak load. His argument was that in a normal situation server will never use all of its RAM so the only way it can encounter OutOfMemory situation is due to some bug/ddos/etc. So in case swap is turned off system will run out of memory that will eventually crash the program hogging memory (most likely the web server process) and probably some other processes. In case swap is turned on it will eat both RAM and swap and eventually will result in the same crash, but before that it will offload crucial processes like sshd to swap and start to do a lot of swap operations resulting in major slowdown. This way when under ddos system may go into a completely unusable condition due to huge lags and I probably will not be unable to log in and kill webserver process or deny all incoming traffic (all but ssh). Is this right? Am I missing something (like the fact that swap partition is very useful in some way even if I have enough RAM)? Should I turn it off?

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  • Exclude a process from being listed in `top`

    - by warren
    Is it possible to exclude some processes from being reported by top? For example, I would like to exclude itself from its listing (ie, I don't want top to show in the process list). I would also like to be able to exclude processes that do not belong to the user running top (except for root). Is this possible? If so, how? If not, is there a similar tool that will do what I want (that does not involve running something like ps frequently).

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  • Server specification recommendation

    - by foo
    To cut the story short, I can't buy an item (server/cpu/motherboard/ram) that costs more than USD 330. However, I can combine them, meaning, I can buy a CPU that costs USD 330 and motherboard that costs USD 330. With this limitation, I can't buy a powerful 1U server which will definitely costs me more USD 330. With that in mind, I was hoping to build a powerful desktop PC which will be used as a database server. However, through my experience, desktop PC doesn't last very long, usually the motherboard will just die by itself after 1 or 2 years. So, what would you guys recommend me to buy with this kind of budget? Every item must be <= USD 330. Will be used as a MySQL server. RAID would be nice. 1TB is pretty big for my data. I do not need external graphic card (onboard would do just fine), mouse, keyboard, monitor. Linux friendly. One ethernet port is good enough. It's important that those hardware is made of components that will last long (at least 3 years or something). The server will be placed in an air conditioned room, but a good ventilation for the server is always preferred. I won't overclock it. Intel processor is preferred. Thanks in advance.

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  • Low 'Burst Rate' from SATA drive in HDTune?

    - by UpTheCreek
    I recently upgraded my laptop's v slow hard drive to a seagate momentus 7200. Everything is working fine, but I'm a bit confused by these benchmark results: The burst rate is significantly less than the Maximim transfer rate, and not much higher than the normal minimum (if you ignore the spikes). What's going on here? On the HDtune website it defines Burst Rate as: ...the highest speed (in megabytes per second) at which data can be transferred from the drive interface (IDE or SCSI for example) to the operating system. Which begs some questions... e.g. if this is the highest, then how did the bechmarking tool record the 103MB/sec maximum? And if this really is the true maximum, then where is the bottleneck? The laptops SATA interface is on an Intel 82801GBM southbridge controller. When I check in hardware manager, I see that it's driver is iaStor.sys from 2005. Maybe that's the issue? I'll look for a newever version, but any insights would be appreciated. Thanks UPDATE: Acorting to this page on the HDTune website... An important parameter of the test is the Burst Rate. This value should always be higher than the maximum transfer rate. A lower value is usually an indication of a configuration problem. So what might be the configuration problem?

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  • Experience with Intel X25-M 160GB and Oracle

    - by derobert
    We're considering building an Oracle database with 12 Intel X25-M G2 160GB drives in software RAID10. It'd be running Linux. Database gets some very heavy write activity during the early morning data load, other than that it is mostly read-only (and the read load is fairly minimal). We're currently running on 11 150GB Velociraptors (also Linux software RAID10), and are hoping the X25-M will speed up the data load. We currently have redo on different disks than the rest of the data. I'm wondering a few things: Any experience with using X25-M drives for databases? The X25-E are unfortunately beyond our budget. Would it hurt to separate redo off to some magnetic (non-SSD) drives, say 2 (raid1) or 4 (raid10) Seagate Constellations?

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  • Application didnt upgraded after upgrading ubuntu to 13.10

    - by Gaurav Dighe
    I upgraded my laptop from ubuntu 13.04 to 13.10. Its working like a charm. But I doubt if software-center, file manager, vlc, etc upgraded. Still I am not getting the new versions of softwares in software-center. I am not able to see any new features in file managers as was noted on many blogs. VLC still showing the old version 2.0.8. Its being said that its upgraded to VLC 2.1 or just a dist-upgrade would do the job. But it didn't. Also I need to know the default applications (with version) provided by ubuntu 13.10 Kindly help.

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  • Severe graphics and application problems after update

    - by jenald
    I wanted to upgrade from 11.10 to 12.04 with the built-in upgrade-feature. but during the upgrade my pc stopped working. When I restarted my PC Ubuntu starts OK, but with many errors (many apps don't work and some graphic-errors). I try to upgrade again to 12.04, but I can't, because my Ubuntu identifies itself as 12.04. I tried to upgrade with the cd-setup but this also doesn't work. What should I do, if I don't want to reinstall the whole system?

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  • Best way to say "sync all system clocks to this server, when and ONLY when I say so?" Mixed setup of Windows+Linux servers.

    - by twblamer
    Title pretty much explains it. Let's say there's 100 servers, various versions of Windows and Linux, and one Windows server is the "master clock." I did look at this question: How do I synchronize clocks between Linux and Windows? This hints that ntp can do what I want if I run "ntpd -q" on a client (?). If I install ntp I also need to guarantee that it will only sync the times when I force it to. Even better if I have a log that tells me every time a sync was performed. I'm doing benchmark runs and I need to be able to say something like this: "Clocks were synced on all the benchmark systems at 09:42:01am on the master. A benchmark run was then initiated and allowed to run for six hours. None of the system clocks were altered during this time interval." I understand there is subsequent clock drift, but for now that's the way we're doing things and I'm doing it with a manual process. I'd rather at least automate the one-time sync.

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  • VPC on Windows 7 very slow network

    - by Shigg
    I have a Windows 2003 virtual machine which I use for website testing. I've just installed Windows 7 and am using the new version VPC (not xp mode). When I try to copy a file - I need to copy some big databases across - I get a file copy speed of about 20k per sec. Copying from one PC to another on the real network transfers files at 13mb per second. Any ideas what may be causing this? I've turned off differential network compression on win 7. The Virtual HD is on a seperate physical drive to the OS. Running Windows 7 64 bit on a dual xeon with 16gb ram and 10,000 rpm drives. Tried installing VPC 2007 but windows blocks it running saying its not compatable. Many thanks for any ideas.

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  • installing application packages on ubuntu usb

    - by mazel
    I'm new to ubuntu. I downloaded the newest version on a usb stick then I booted my PC with the usb. upon trying out ubuntu I tried installing additional packages/applications, which worked fine. BUT when I then after tried using my ubuntu usb, the new installed apps were not there! if I get that right, ubuntu would only install new packages to the actual PC I'm using it on. not within ubuntu itself!? is there a way that I can install new applications to my ubuntu usb and it should stay within ubuntu so I can use it for other pc's which don't have an internet connection necessary to update/install packages ? thanks so much

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  • How to remove the pause during JBoss 5.1.0 GA boot between ProfileServiceBootstrap and AnnotationCreator?

    - by rrc7cz
    I've managed to strip down my JBoss profile enough that it boots in 1.5 minutes. I started with the web profile and started pulling out stuff I didn't need. The bulk of my boot time can be seen here: ... 15:21:51,890 INFO [ProfileServiceBootstrap] Loading profile: ProfileKey@86d597[domain=default, server=default, name=np] 15:22:55,406 WARN [AnnotationCreator] No ClassLoader provided, using TCCL: org.jboss.managed.api.annotation.ManagementComponent 15:22:55,578 WARN [AnnotationCreator] No ClassLoader provided, using TCCL: org.jboss.managed.api.annotation.ManagementComponent ... Does anyone have any idea what JBoss is doing here for 1 minute? If so, is there any way to speed it up or skip it entirely? This is for developer instances, so boot time is quite important.

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  • Thunderbird very slow with Gmail

    - by koskoz
    I'm using the latest version of Thunderbird with 3 Gmail accounts. Every time I launch it it seems it's downloading all my messages again. I've compacted folders (is the action working for the 3 accounts or do I need to do it for each of them?) and deleted the .msc files but nothing change. It leads to a software using a lot of bandwidth and being very slow when using it. It's a pain to write a message or even to view one. All the software is so slow I've never seen that it's almost unusable. I'm using thses addons : Dictionary Google Calendar Lightning My Gmail accounts are configured to imap.

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  • Do control groups improve system performances?

    - by qdii
    According to this website, enabling cgroups in the kernel can boost performances by sharing resources in a better way. In particular, the conclusion states that:  Nevertheless, with a little trial and error, cgroups can help you improve the efficiency of your systems’ resource usage and avoid downtime due to overusage of a single service. Kernel seeds, however, recommend to deactivate them altogether. They say: Consider these [kernel] settings poison. They remain nothing but system slow-downs. They are all off by default [in the proposed kernel config file]. Who should I trust?

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  • Web Application Development - 4 Steps Process

    With the growth of internet, web marketing and web business are taking their shapes. Number of investors and marketers are forging ahead in devising new and innovative techniques and web applications that can facilitate its process and promotions. And if you wonder how internet have developed the mode of communication.

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  • Application Visibility Issues

    Recently we became aware that some Android applications were not visible on the Android Marketplace. While we were internally troubleshooting and qualifying the fix and communicating with our...

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  • How to monitor a Windows process' working set greater than 4GB?

    - by Shoeless
    Apparently the .NET framework has a bug that prevents working set values above 2GB from accurately being determined. Between 2 and 4GB one can apply some xor-ing calculation to obtain the value, but there's no means of obtaining working set values greater than 4GB (using .Net or WMI) What method can be used - preferably from a PowerShell script - to obtain an accurate measurement of a process' working set when the working set is greater than 4GB? (some side details can be found in this StackOverflow question)

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  • Need reasonably priced router with QoS support [closed]

    - by ULTRA_POROV
    I dont need wireless. I am expecting very heavy traffic, with possibly thousands of tcp connections open at one time. This would require that the router has good hardware. I also need to limit the different services i will provide. Lets say i need to guarantee 60% of all the bandwidth to HTTP, 10% FTP, and 10% for Mail... So the router software must have flexible QoS options as well. I don't know which one to chooose, because this information is usually not given on the router specs.

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  • Why might one hard disk perform slower than another?

    - by Styne666
    I have just bought two WD 3TB Reds (WD30EFRX) for a FreeNAS box and whilst doing burn-in testing it seems like one is consistently taking about 10% longer than the other. So far I've done: a dd read test of the whole device, a long SMART test and it's currently halfway through a badblocks -wvs. The second device is lagging behind the first on all of them. I'm running these commands on Debian stable in two Konsole tabs. Is there a reason this could be considered normal behaviour or is it worth running the tests independantly? They're both plugged in to the LSI 2308 (IT mode) on a Supermicro X10SL7-F.

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