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• Neccessity of push and pop operands on CPUs

  - by Hawken

  Why do we have commands like push and pop? From what I understand pop and push are basically the same as doing a (mov then add) and (sub then mov) on esp respectively. For example wouldn't: pushl %eax be equivalent to: subl $4, %esp movl %eax, (%esp-4) please correct me if stack access is not (%esp-4), I'm still learning assembly The only true benefit I can see is if doing both operation simultaneously offers some advantage; however I don't see how it could.

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• writing boot sector code

  - by JGC

  hi I want to write a code which put something in bootsector but when I run the assembly 8086 code which does this purpose, nothing happens. does any one know what can I do or does any one has code (in any language) which answer my need?

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• Is it possible to access 32-bit registers in C ?

  - by C4theWin

  Is it possible to access 32-bit registers in C ? If it is, how ? And if not, then is there any way to embed Assembly code in C ? I`m using the MinGW compiler, by the way. Thanks in advance!

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• How do machine code instructions get transferred to the CPU?

  - by user3711789

  I'm currently investigating what the runtime of different programming languages looks like behind the scenes. For a compiled language like C, people usually give the explanation of "Code is compiled to assembly which is assembled and linked into a binary executable. The executable is then loaded into memory and the CPU interprets it." My question is how does the CPU know where to look for the next instruction to execute? Is it a memory address stored in one of the registers?

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• How can I go about writing to the console in fasm?

  - by codinggoose

  The code I currently have can be found at: http://fasm.pastebin.com/yY3C0aVF I'm exceptionally new to assembly, only picked it up yesterday and I've looked through many an example and still can't figure out for myself how to write to the console. I always get an error when I seem to replicate it in my own way. If I'm not on the right track at all please let me know, also if you can suggest a good book on fasm it would be greatly appreciated.

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• Using .align in inline assemby

  - by tech74

  Hi, I'm using ".align 16 \n\t" in some inline ARM assembly that is implementing some loops to align it on a 16 byte boundary however gcc asm compiler is complaining that alignement is too large i want to implement -falign-loops=16 in asm for a particular loop Thanks

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• how to write hello world in assembler under windows?

  - by feiroox

  Hi I wanted to write something basic in assembly under windows, I'm using nasm, but I can't get anything working. How to write and compile hello world without help of c functions on windows? thx

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• Pin Control in HCS12

  - by Brian Lindsey

  A HCS12 microcontroller I had to buy for a class I had recently taken has 40 pins on the back side of it. The class was merely about computer organization, and so unfortunately, we never had a chance to cover all the capabilities of the chip itself. Now that the class is over, I have been thinking about using the to familiarize myself with the assembly language. I haven't found any sources that cover pin control and was wondering if anyone could possibly provide me with a hands-on pin tutorial.

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• Whats the proper way of accessing a database through an assembly?

  - by H4mm3rHead

  Hi, I have a ASP.NET MVC application which is build up as an assembly that queries the database and a asp.net frontend that references this assembly and this assembly abstracts the underlying database. This means that my Assembly contains a app.config file that contains the connectionstring to the database (Linq to Sql data model). How do I go about making this more flexible? Should i make a "initialize()" method somewhere in my assembly which takes the connection string from the asp.net mvc application and then that controls which database to use? or how is this done?

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• How to add reference an assembly that is not in the GAC from a t4mvc template (.tt)

  - by stephen

  I have found the place near the very top in a T4MVC template file (.tt) where assembly references can be added, which looks like: <#@ assembly name="System.Core" #> <#@ import namespace="System.Collections.Generic" #> However, it seems that I can only reference assemblies that are in the GAC. i.e. if I have an assembly MyProject.Stuff.dll (not in the GAC) added as a reference to the VS project containing the template then I expected to be able to add something like the following: <#@ assembly name="MyProject.Stuff" #> <#@ import namespace="MyProject.Stuff" #> If I do this then I get the following error: Error 1 Compiling transformation: Metadata file 'MyProject.Stuff' could not be found C:\Work\Development\DotNetSolution\MyProject\Utils\T4MVC\T4MVC.tt 1 1 How can I add a reference to an assembly that isn't in the GAC?

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• How can i connect two or more machines via tcp cable to form a network grid?

  - by Gath

  How can i connect two or more machines to form a network grid and how can i distribute work load to the two machines? What operating systems do i need to run on the machines, and what application should i use to manage the load balancing? NB: I read somewhere that google uses cheap machines to perform this fete, how do they connect two network cards( 'Teaming' ) and distribute load across the machines? Good practical examples would serve me good, with actual code samples. Pointers to some good site i might read this stuff will be highly appreciated.

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• loading Data in VBA from a text file

  - by omegayen

  I am not very familiar with VBA but need to use it for a new software program I am using (not Microsoft related) I have a text file that has columns of data I would like to read into VBA. Specifically the text file has 4 entries per row. Thus I would like to load in the column vectors (N by 1). The text file is separated by a space between each entry. So for example I want to load in column one and save it as array A, then column two and save as array B, then column three and save as array C, and then column four and save as array D. This code snippet found below from http://www.tek-tips.com/faqs.cfm?fid=482 is something I found that can load in text to an array, but I need to adapt it to be able to save the columns as different arrays as specified above... Open "MyFile.txt" For Input As #1 ReDim Txt$(0) Do While Not EOF(1) ReDim Preserve Txt$(UBound(Txt$) + 1) Input #1, Txt$(UBound(Txt$)) Loop Close #1

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• How to copy referenced assembly's dependecies to ASP.NET output bin folder?

  - by LD2008

  Hi all, In Visual Studio 2010, I have project A (asp.net application). Project A references project B (class library). Project B references assembly C (direct reference to a DLL). When building project A, only project A and project B binaries are present in the /bin directory of project A, but not the assembly C. Why is that? If project B depends on assembly C, why is assembly C not copied together to the output folder? "Copy local" is already set to "true" for assembly C. Any information would be appreciated. Thanks!

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• LVS TCP connection timeouts - lingering connections

  - by Jon Topper

  I'm using keepalived to load-balance connections between a number of TCP servers. I don't expect it matters, but the service in this case is rabbitmq. I'm using NAT type balancing with weighted round-robin. A client connects to the server thus: [client]-----------[lvs]------------[real server] a b If a client connects to the LVS and remains idle, sending nothing on the socket, this eventually times out, according to timeouts set using ipvsadm --set. At this point, the connection marked 'a' above correctly disappears from the output of netstat -anp on the client, and from the output of ipvsadm -L -n -c on the lvs box. Connection 'b', however, remains ESTABLISHED according to netstat -anp on the real server box. Why is this? Can I force lvs to properly reset the connection to the real server?

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• Fortigate - Accessing a Virtual Server address from several interfaces

  - by Jeremy G

  I am setting up a new application in its own DMZ on our Fortigate 300C firewalls. I have defined a load-balancing configuration for part of the application, and this works fine for traffic coming in from our internal network. However, I would also like this application to be reachable from other DMZs, for inter-application traffic, and from the SSL VPN interface. I can't seem to define the required policy, and it seems this is due to Virtual Servers being bound to the client interface on the Fortigate rather than the server interface (and so my virtual IP is not accessible from any of these other interfaces) Does anyone have an idea how I might go about this ? I guess I could create other virtual IPs for each interface, but this gets complicated to handle as clients need to change the address they use depending on how they are connecting. Thanks, Jeremy G

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• scalability with nginx, passenger, ruby on rails setup

  - by Dani Cela

  Hey guys I had a question regarding scalability for my RoR application. We have been optimizing our application over the last few days and after running blitz.io, notice that our application times out after maybe 1000 hits in 30 seconds we experienced massive timeouts. In the 1 minute test apparently 74% of users would have timed out. Look at the performance of my website: http://blitz.io/report/1c8eb2f395a5eadeabd62fd831ada9e5 Not saying that our website will in any way experience this now, but I wish to design the infrastructure to handle this. What is normally done in this situation? Currently we have one web server and one database server. Would load balancing be the route to go?

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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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• Looking for the best ec2 setup for 3 sites totaling in 1.5 mil in traffic monthly

  - by john h.

  I am looking to consolidate our current aws setup of 2 Large ubuntu ec2 servers and 2 large RDS server for our 3 websites that have a total of about 1.5 million hits a month and increasing every month with the majority of traffic (1 mil) to one forum site in the group and the rest of traffic to an ecommerce site and a small wordpress site. So here is my question/thought? Would it be better for us to combine the two ec2 large servers to just one and same with the 2 RDS servers so we run all three sites off one large ec2 and one RDS. -or- Should we setup maybe 2-3 smaller ec2 servers load balenced and a single RDS. -or- Something completely different setup? One concern is that if one site crashes it takes with it the others. It happened in the past but I am pretty sure its because of the forum software and not the server setup. -john

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• Good Books About Scaling Up Databases/Servers/etc.?

  - by Mehrdad

  I've applied for an internship at a startup company that expects its user base to grow by a large factor in a small amount of time, and so part of their project is to scale everything up so that they're ready: handling more/larger requests efficiently, handling server failures, load balancing, getting more JavaScript to run faster on the client computers, etc. Part of my job will also be figuring out what to do, so it's not obvious what my exact task will be at the moment. I was told that I should start reading up a little more about this so that I would have a little bit of an idea of what to do. What are some good books for me to read on this topic? I have a little bit of experience with the usage of MySQL (and also a little experience with web development), but in no way do I claim any knowledge on the internal workings of databases or distributed systems, so I might need readings more on the introductory side.

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• Can I use nginx to start EC2 instances on demand?

  - by Gabe Hollombe

  TL;DR - Is there a way to make nginx act as an elastic load balancer that will spin up EC2 instances on demand, allowing for the case when periods of no demand mean no instances will be running? Longer explanation - I have an nginx server that proxy_pass'es requests to a server on EC2. This server doesn't get many requests, so I'd like to keep the server spun down during periods of inactivity (I already have a script to do this). Then, when the instance is spun down and nginx gets a request for that instance, it will time out when trying to get a response from it. At this point, can I somehow trigger a shell command on the server to use EC2's command line tools to spin up the instance, then re-try the user's request after it has started?

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• Loadbalance UDP traffic with session affinity and way to take servers in & out of rotation

  - by William

  What is the best way to go about load balancing UDP traffic among a whole bunch of servers, while keeping session affinity based on the users' IP? I need to also be able to take servers in and out of rotation for new clients, so when they join for the first time, they get put on a server in a list of available servers, and clients already connected would stay connected to their specific server. I have written the software to maintain a list, but I can't seem to find anything that would perform this functionality. If you need the context, this is to facilitate game tournaments for Minecraft: Pocket Edition, which is done with UDP traffic, I cannot change the protocol. And, because tournaments open and close, I need to be able to place players on their proper servers. Performance is also a priority, I have a program to do this but it is very bloated and slow. Thanks for any help! William

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• LVS TCP connection timeouts - lingering connections

  - by Jon Topper

  I'm using keepalived to load-balance connections between a number of TCP servers. I don't expect it matters, but the service in this case is rabbitmq. I'm using NAT type balancing with weighted round-robin. A client connects to the server thus: [client]-----------[lvs]------------[real server] a b If a client connects to the LVS and remains idle, sending nothing on the socket, this eventually times out, according to timeouts set using ipvsadm --set. At this point, the connection marked 'a' above correctly disappears from the output of netstat -anp on the client, and from the output of ipvsadm -L -n -c on the lvs box. Connection 'b', however, remains ESTABLISHED according to netstat -anp on the real server box. Why is this? Can I force lvs to properly reset the connection to the real server?

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• Round-Robin DNS in mobile networks

  - by k7k0

  After reading load distribution alternatives and giving my limited skills on the area I'm biased toward round-robin DNS strategy. From what I understood, one key aspect of DNS Round-Robin is setting a low TTL value, avoiding caching. My main concern is that all my traffic comes from mobile networks, almost 30% of that comes from t-mobile 3G. Some questions: 1) Is there a chance that almost all clients on the same mobile network will be redirected to the same IP in the TTL frame? That would kill the distribution technique. 2) If I choose a really low TTL (zero or one). That impacts directly over client performance? It does a DNS miss every time or it's a setting that only impacts on DNS servers? Any help would be much appreciated. Thanks

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• Existing connexion on Apache and mod_proxy_balancer don't fail over second JBoss node

  - by Jean-Rémy Revy

  I have a Jboss farm, load balanced by Apache HTTP + mod_proxy_balancer and mod_proxy_ajp, with the following configuration : <VirtualHost *:80> ServerName web-gui-acceptance.myorg.com ServerAlias web-gui-acceptance ProxyRequests Off ProxyPass /web-gui balancer://jbosscluster/web-gui stickysession=JSESSIONID nofailover=On ProxyPassReverse /web-gui http://srvlnx01.myorg.com:8080/web-gui ProxyPassReverse /web-gui http://srvlnx02.myorg.com:8080/web-gui <Proxy *> AuthType Kerberos [...] </Proxy> <Proxy balancer://jbosscluster> BalancerMember ajp://srvlnx01.myorg.com:8009 route=SRVLNX01_node1 BalancerMember ajp://srvlnx01.myorg.com:8009 route=SRVLNX02_node1 ProxySet lbmethod=byrequests </Proxy> </VirtualHost> When the first JBoss node fail (the hosting VM is down), my existing connexions don't fail over the second node ... the fist route is keeped (in table / .shm ?) and that provide me 503 errors. Can someone tell me what I missed ?

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