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  • Performance issues with new dedicated server [closed]

    - by Pierre Espenan
    I have just subscribed to a new dedicated server and am getting worst than expected PHP execution performance. Execution times are twice as high as on my old mutualized server! I'm definitely not an expert at server management, so I'm wondering what I missed. Here are some stuff that can help you understand what's wrong here : My server (in french but easy to understand) : http://www.online.net/fr/serveur-dedie/dedibox-sc phpinfo(); output : http://jsfiddle.net/E8b7W/embedded/result/ PHP bench script (dedicated server) : http://jsfiddle.net/EhXzK/embedded/result/ PHP bench script (old mutualized) : http://jsfiddle.net/ANbWt/embedded/result/ Is it normal to get such poor performances after a kernel update and basics "apt-get install" for apache2 and php ? Thanks !

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  • Importance of verifying user email on web signup

    - by sunwukung
    I know this question is crazy - but my employers client is demanding that email verification be removed from the sign up process (they feel it is impeding sign up). I wanted to garner feedback from the programming community at large as to their experience and opinions regarding sign up and email verification - and the possible consequences of removing this safeguard.

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  • Routing using Linux with 2 NIC cards

    - by Kevin Parker
    Configured Clear OS to be in Gateway mode on a machine with two NIC cards. eth0:192.168.2.0/24 with ip 192.168.2.27 which is connected to a modem and thus have internet connectivity. eth1:192.168.122.0/24 with ip 192.168.122.10 which is connected to other machines in LAN through switch. LAN machines with network 192.168.122.0 is not getting internet.How can they get internet Through Clear OS gateway.I have enabled packet forwarding in clear os using "ip_forward=1" What am i missing?.Can you please help me in this. Following are the static routing i have added: on LAN machine1 with ip address 192.168.122.11 ip route add 192.168.2.0/24 via 192.168.122.10 dev eth0 ip route show 192.168.2.0/24 via 192.168.122.10 dev eth0 192.168.122.0/24 dev eth0 proto kernel scope link src 192.168.122.11 But still 192.168.2.0/24 network is not reachable.Where can be the problem??

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  • Compare Quagga to XORP

    - by Sargun Dhillon
    What do you think of Quagga compared to XORP as a dynamic software routing engine? What are the technical merits of each engine comparatively? Additionally, what do most people think of them from a programming view. Who has manipulated networks using these enginers? I was wondering from an OSPF, routing, BGP protocol user's perpspective.

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  • Best Python IDE for my situation

    - by ChrisC
    I want to write a database app in Python, using SQLite and wxPython. My only "experience" is 1 class on basic C++ console programming and OOP concepts. Which IDE would be best for my situation? In case it matters, I only need my new program to run on Windows, and I do want to make it "portable". Thank you.

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  • Baby steps to get into Android application development

    - by Ra'ed Boshmaf
    I am in my semester vacation and i am looking to spend some time in learning how to develop Android application since this market is on fire these days, i have a background with programming and would like you to suggest ways or even sites that use baby steps tutorials to get an idea ( and hopefully ) create android application. Any suggestions would be great since i spend the last 2 days searching the web without finding what i am looking for thanks.

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  • ip routes to specific interface

    - by user65053
    I am trying to figure out how to get all traffic to 10.8.78.* to connect using interface ppp0 when available how would I properly handle this (centos) and can I fall back on eth0 when pp0 is not up? /sbin/route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 69.19.219.69 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 10.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 10.0.1.1 0.0.0.0 UG 0 0 0 eth0

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  • Can somebody link me to some code where there is a fantastic or a nice use of Inheritance

    - by Soham
    I strongly believe that, reading code and reading good code is key to great programming. If not one of the many. I had been facing some problems in visualizing and having a "feel" of using inheritance to better my code architecture. Can somebody give me some link to good code to emulate, where folks have used inheritance in an absolute "kung-fooey ruthless" manner [in a good way]

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  • Where can I find a good software implementation plan template?

    - by Corpsekicker
    This is not "programming" related as much as it is "software engineering" related. I am required to produce an implementation for additional functionality to a complete system. All I am armed with is knowledge of the existing architecture and a functional spec with visual requirements, user stories and use cases. Is there a standardised way to go about this? I suck at documentation.

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  • Caching DNS server (bind9.2) CPU usage is so so so high

    - by Gk.
    I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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  • Are there any good books to learn C++ if you already know Java and C#

    - by JF LR
    Hi, I would like to know if you have any good books that teach C++ programming without repeating basic stuff. In fact, I already well know Java and C#. I also have a basic knowledge in C and assembly, so I understand a little bit pointer arithmetic, manual memory management and heap based allocation. I was looking at O'Reilly's C++ in a Nutshell and was also wondering if this book would be a good choice. Thank you

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  • Can you recommend me a good magento book ?

    - by bgy
    I'm almost ready to use Magento (which is built upon Zend Framework, which i know) and i'm looking for a good book covering setup, config, best practices, creating templates, development, etc. Do you have any to recommend ? I found some which look insteresting : The Definitive Guide to Magento Pro Magento Developer's Guide Php Architect's Guide to E-commerce Programming With Magento Any feedbacks on those one ?

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  • how to pass objects between two servlets?

    - by rohit
    hi, i am new to servlet programming. i want to know that... is it possible to pass objects between two servlets residing on different application servers??? say two tomcat servers... means what i want to do is: [browser]-- [app server 1 performs some operation on data]-- [server 2 does some operation on data] i am sure it is possible but can anyone tell me how??

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  • How to determine the event of the linux devices?

    - by sasayins
    Hi, I am learning some embedded programming. I am using Linux as my platform and I want to create a daemon program that will check if a particular device(magstrife, keypad, etc) is active. Like for example, my daemon program is running in the background, then when I make a keypress event, my deamon app will do something. What implementation should I do to create this app? And how can I check the event of the devices? Thanks.

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  • Double paging definition

    - by Albinoswordfish
    This is not a programming question but more of an operating system question Right now I'm trying to learn what exactly Double paging means. I see two different terms, double paging on disk and double paging in memory. Apparently this problem arises when we introduce a buffer cache to store disk blocks when doing File I/O But I'm not really sure what exactly this term means. If anybody could specify it would be very helpful.

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  • Learn C# now or finish up with Java and then learn C#?

    - by Sahat
    Ok here is my situation. I've studied Java in my college for 2 semesters. But you know they teach you jack in there, just the basics. We skipped half of our textbook and even then our professors don't teach from section to section of each chapter. I don't blame them. It's hard as it is for new students to understand even the basic concepts of programming. Now this is a community college we are talking about and not Stanford, MIT or Berkeley. So like I said I've done 2 semester of Java. I really like our textbook because it has some challenging projects to do at the end of each chapter. This textbook is pretty clear and i have no problem understanding it (although 2-D and 3-D Arrays have given me some trouble). I have tried reading a few C# books such as Pro C# 2008 and .NET 3.5 and C# 4.0 in a Nutshell. I found these books to be dry and overloaded with information that put me to sleep (No offense to the authors of those 2 wonderful, according to amazon ratings, books). Would you suggest I finish my Java textbook, brush up my knowledge of Arrays, Polymorphism, and etc that are universal to most programming languages. And then switch to C#, plus the syntax is very similar so it should be easy to switch. Or should I just start learning C# right now from the very beginning? If it's the latter then could you recommend some free online resources that will keep me engaged and at the same time teach me everything I need to know about C#. Someone has recommended me to learn .NET first, but I found it to be not the brightest idea. .NET is just a big monster full of libraries. How am I going to apply it if I don't even know the C# or VB!? Anyway back to my question: Master Java and switch to C# or just go with C#? DISCLAIMER: I don't want to start .NET vs J2EE or C# vs Java flame war. I am going with C#. I've decided that I want to work in a Microsoft shop in the future. .NET is what I want to learn. Thanks! Will be waiting for the answers.

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  • Practical examples of using symbols in Scala?

    - by Jesper
    Scala has symbols - names that start with a single quote ' and which are a kind of string constants. I know symbols from Ruby (where they start with a colon). In Ruby they are used for some meta-programming tasks, like generating getters and setters for member variables (for example attr_reader :name to generate a getter for name). I haven't seen a lot of use of symbols in Scala code yet. What are practical uses for symbols in Scala?

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  • NTFS write speed really slow (<15MB/s)

    - by Zulakis
    I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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  • what does driver program mean?

    - by Tom
    there is a quote from Algorithms for Java (sedgwick 2003) p. 135: "we commonly use driver programs when developing or debugging adt iplementations" what is meant by driver program? google just gives me loads of info about programming drivers, clearly not related

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  • Sealed alternative

    - by Jeriho
    According to "Programming in scala" a sealed class cannot have any new subclasses added except the ones in the same ?le. In the same book was described a way to enumerate classes that can extend class or trait in multiple files. I have forgotten it and can't find again. Remind it to me, please.

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  • Serial port data availability problem

    - by harry
    Hello Evryone. I am new to this type of programming..i just want some help...regarding what to do when u need to extract the data from the serial port..and how to check that tha data is available in the serial port..so that no data loss is there....

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