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  • Difference in String concatenation performance

    - by Homer
    I know you should use a StringBuilder when concatenating strings but I was just wondering if there is a difference in concatenating string variables and string literals. So, is there a difference in performance in building s1, s2, and s3? string foo = "foo"; string bar = "bar"; string s1 = "foo" + "bar"; string s2 = foo + "bar"; string s3 = foo + bar;

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  • Difference between RPM (yum) and apt-get

    - by Josh K
    Functional difference between the two? Packages different style or what? I'm dipping my toe in the server pool and playing with an Ubuntu install right now, which is apt-get. I'm also considering FreeBSD and Debian if I do decide to start running my own VPS. So far things have been very easy, sudo apt-get install apache2 and the like with no issues at all. I'd like to know if there is a different learning curve to yum or variants.

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  • Difference between "Redirect permanent" vs. mod_rewrite

    - by Stefan Lasiewski
    This is an Apache httpd 2.2 server. We require that access to this webserver be encrypted by HTTPS. When web clients visit my site at http://www.example.org/$foo (port 80), I want to redirect their request to the HTTPS encrypted website at https://www.example.org/$foo . There seem to be two common ways to do this: First method uses the 'Redirect' directive from mod_alias: <VirtualHost *:80> Redirect permanent / https://www.example.org/ </VirtualHost> Second method uses mod_rewrite: <VirtualHost *:80> RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} </VirtualHost> What is the difference between a "Redirect permanent" and the mod_rewrite stanza. Is one better then the other?

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  • loadbalancing with difference nginx location context and backend server context

    - by robinmag
    Hi, I used nginx and upstream module for load balancing with the following config upstream lb { server 127.0.0.1:8080; server 127.0.0.1:8081; } server { listen 88; server_name localhost; location /cas/ { proxy_pass http://lb; proxy_redirect off; proxy_connect_timeout 2; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } the problem is the "location /context/" have to match to the context of backend server so when i request localhost/context/index.html then nginx routes it to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html. Is it possible to have difference backend context and nginx location for example with "location /" nginx will routes the request to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html Thank you.

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  • loadbalancing with difference nginx location context and backend context

    - by robinmag
    Hi, I used nginx and upstream module for load balancing with the following config upstream lb { server 127.0.0.1:8080; server 127.0.0.1:8081; } server { listen 88; server_name localhost; location /cas/ { proxy_pass http://lb; proxy_redirect off; proxy_connect_timeout 2; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } the problem is the "location /context/" have to match to the context of backend server so when i request localhost/context/index.html then nginx routes it to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html. Is it possible to have difference backend context and nginx location for example with "location /" nginx will routes the request to 127.0.0.1:8080/context/index.html or 127.0.0.1:8080/context/index.html Thank you.

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  • What is the difference between DLNA and UPNP ?

    - by David Michel
    Hi All, Can someone tell me the what is the difference between DLNA and UPNP ? I can see that some devices such as NAS have their specifications mentioning both (e.g. Iomega StorCenter) or only DLNA (e.g. Netgear Stora). Is this a synomym for the same thing or is is actually 2 different protocals ? Are they compatible, i.e. if a media server uses DLNA and the streaming device uses UPNP, will it work ? I looked around but could not find any clear answer... Many thanks David

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  • Hyper-Threading and Dual-Core, What's the Difference?

    - by Josh Stodola
    In a conversation with the network administator, I mentioned that my machine was a dual-core. He told me it was not. I brought up the task manager, went to the perfomance tab, and showed him that there are two separate CPU usage graphs. I have a quad-core machine at home and it has four graphs. He told there were two graphs on this particular machine because of hyper-threading. I used to have a hyper-thread pentium 4 processor back in the day, but I never fully understood what it meant. So what is the difference between hyper threading and dual-core? And how do you tell which one you have?

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  • Is there such a thing as a Google Result Set simulator?

    - by Dave Adams
    I am always making tweaks to my site, be it in the .htaccess file, some new SEO plugin, different types of content or whatever. For all these changes, I would really like to be able test it immediately and see if the change had any positive or negative effect. I am just wondering if there was some way of doing immediate testing using some simulator instead of having to wait for Google to discover and index it - which could take a long time.

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  • Difference between *:80 and _default_:80 in Apache2

    - by Johannes Ernst
    I'm trying to understand the difference between the following two terms: *:80 _default_:80 in the Apache configuration file. The documentation here is unclear to me, and the only mailing list conversation that I could find here does not shed any (comprehensible, to me) light on the matter either. I have a bunch of name-based virtual hosts declared like this: <VirtualHost *:80> ServerName example.com ... and I'd like to have an entry that fires when none of those match, i.e. when a request comes in without a virtual host name, or with a virtual host name that has not been declared. Should I use *:80 or default:80?

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  • Apache - Difference between ScriptAlias and WSGIScriptAlias

    - by Jiri Kadlec
    I'm using apache on RHEL Linux server In my /etc/httpd/conf.d/httpd.conf there are two directives: WSGIScriptAlias /apps /var/www/apps <Directory /var/www/apps > Options MultiViews ExecCGI MultiviewsMatch Handlers SetHandler wsgi-script Order allow, deny allow from all </Directory> ScriptAlias /scripts /var/www/scripts <Directory /var/www/scripts > Options MultiViews ExecCGI MultiviewsMatch Handlers SetHandler wsgi-script Order allow, deny allow from all </Directory> What is the difference? I understand that WSGIScriptAlias is restricted for running Python scripts and ScriptAlias also allows running perl scripts. Can I always use ScriptAlias instead of WSGIScriptAlias? Are there any performance advantages of using WSGIScriptAlias instead of ScriptAlias?

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  • What is the difference between moveBackward: and moveLeft: when using NSResponder -interpretKeyEvent

    - by nciagra
    I'm implementing a custom text box using -interpretKeyEvents: and am trying to figure out what the difference is between moveBackward: vs moveLeft: and moveForward: vs moveRight:. moveLeft: is bound to the left arrow and moveBackward: is bound to Ctrl + B. The documentation describes them almost identically and they seem to behave identically in practice. I'm assuming this is just a holdover from Vim? Does anyone know what the real difference is? Should moveBackward: just call my moveLeft: implementation? Thanks a lot, Nick

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  • Difference between VMWare tools?

    - by tore-
    I'm currently writing a module for puppet which installs VMWare tools to virtual nodes. I want to do this via yum and and yum-repo. VMWare have their own repo (http://packages.vmware.com/tools/esx/3.5latest/rhel5/x86_64/index.html) which I thought I could use, rather than creating my own. But then I noticed that their repo files is alot different than the rpm file used when installing VMWare Tools on the node, via the "Install/upgrade VMWare Tools" in vSphere. Does anyone know what the real difference is? Does anyone have any preferences?

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  • Difference between multiple NS and NS having multiple A

    - by Jake
    I found this Can an NS Record Point To Multiple A Records?, but wonders what is the difference, if any. For example: mydomain.com. IN NS ns1.myhost.com. mydomain.com. IN NS ns2.myhost.com. ns1.myhost.com. IN A 111.222.333.1 ns2.myhost.com. IN A 111.222.333.2 versus mydomain.com. IN NS ns.myhost.com. ns.myhost.com. IN A 111.222.333.1 ns.myhost.com. IN A 111.222.333.2 EDIT: actually, come to think of it, it could be said the same for MX records. Any breaking differences? EDIT 2: then again, MX allow use of priority values so its a different case, in that one-ip-per-domain is more useful sometimes.

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  • xargs -I replace-str option difference

    - by foresightyj
    From my understanding, the following should mean exactly the same: ls -1 | xargs file {} ls -1 | xargs -I{} file {} if -I option is not specified, it is default to -I{}. I want to list all files in the current directory and run file command on each of them. Some have spaces in their names. However, I noticed the difference. See below: $ ls -1 Hello World $ ls -1 | xargs file {} {}: ERROR: cannot open `{}' (No such file or directory) Hello: ERROR: cannot open `Hello' (No such file or directory) World: ERROR: cannot open `World' (No such file or directory) $ ls -1 | xargs -I{} file {} Hello World: directory With -I{} explicitly specified, blanks in file names are treated as expected.

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  • What's the difference between reflow and repaint?

    - by Jon Raasch
    I'm a little unclear on the difference between reflow + repaint (if there's any difference at all) Seems like reflow might be shifting the position of various DOM elements, where repaint is just rendering a new object. E.g. reflow would occur when removing an element and repaint would occur when changing its color. Is this true?

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  • What is the difference between sar -B verses sar -W

    - by Mark
    I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W I read the man page, and I understand that -B gives me the paging statistics and -W gives me the swapping statistics. What I would like to understand is the following: What is the correlation between the two sets of statistics. When should I be concerned about -B and when about -W? ie, what values from each command should I be concerned with? Which statistic is more closely related to system performance Thanks

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  • What is the difference between "someValuesFrom" and "allValuesFrom"?

    - by ahmed
    In descriptive logic, what is the difference between "someValuesFrom" and "allValuesFrom"? In other words, the difference between (limited existential quantification) and (value restriction). For example, consider this picture: I have used the photoshop because I can't write some symbols. Is there any way to simplify the concept of somevaluefrom and allvaluesfrom?

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  • what is difference between WSDL and SPML?

    - by mad sammy
    Hi, Can somebody please tell me whether there is any difference between SPML and WSDL? Are they related to each other? I have read things saying that WSDL is generic, used for any service, while SPML is only for provisioning services. I have tried googling for things but I am still not getting what is the exact difference between WSDL and SPML. Thanks..

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  • Are there significant performance difference between chipsets?

    - by Let_Me_Be
    I wanted to build a single PC to fit all my needs, but since hardware virtualization support (Vt-d specifically) is a huge problem, I decided to build multiple single-use oriented computers. In this scenario I want these computers to be as minimal as possible. So the core of my question is: "Are there significant performance difference between chipsets?" I'm considering Sandy-Bridge i7 or i5 for my "game console" computer. And since I will use only one graphic card, one or two HDD, 4-8GB RAM and nothing else, I would be fine with a micro-ATX board with a Q67 (or some other low-end chipset).

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