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  • In a virtual machine monitor such as VMware’s ESXi Server, how are shadow page tables implemented?

    - by ali01
    My understanding is that VMMs such as VMware's ESXi Server maintain shadow page tables to map virtual page addresses of guest operating systems directly to machine (hardware) addresses. I've been told that shadow page tables are then used directly by the processor's paging hardware to allow memory access in the VM to execute without translation overhead. I would like to understand a bit more about how the shadow page table mechanism works in a VMM. Is my high level understanding above correct? What kind of data structures are used in the implementation of shadow page tables? What is the flow of control from the guest operating system all the way to the hardware? How are memory access translations made for a guest operating system before its shadow page table is populated? How is page sharing supported? Short of straight up reading the source code of an open source VMM, what resources can I look into to learn more about hardware virtualization?

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  • How to backup/restore IIS 5.1 or move to another machine?

    - by mickeyf
    We have a web based application that run on an Intranet. For various reasons, we are constrained to using Win XP and the version of IIS that ships with it, 5.1. http://support.microsoft.com/kb/325889 talks about backing up IIS, but the sentence: "This backup method does not work if you reinstall your operating system." makes me nervous. Our main reason for backing up is in the event of catastrophic failure, which would certainly mean reinstalling the operating system. I imagine there must be a fairly painless mechanism for backing up and restoring to a fresh machine (or moving to a different one), but I have not found it. Also this is instructions for manually backing up. An automated process would be even better. thanks!

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  • Connecting to sql server database mdf file without installing sql server on client machine ?

    - by Shantanu Gupta
    I am creating a window application that need to use sql server database. I want to install this application to client machine without installing sql server so that my application can still connect to a database i.e mdf file that i will be providing at client system. How can i connect to a database(mdf) on client machine through my window application without installing sql server. ? I dont know is it possible or not. If possible what will be the connection string in that case. Database need not be used in network. Client mahine dont need any installation. Every thing needs to be run through pen drive

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  • How can I run a command on a remote machine with Perl?

    - by Bharath Kumar
    I'm using following code to connect to a remote machine and try to execute one simple command on remote machine. cat tt.pl #!/usr/bin/perl #use strict; use warnings; use Net::Telnet; $telnet = new Net::Telnet ( Timeout=>2, Errmode=>'die'); $telnet->open('172.168.12.58'); $telnet->waitfor('/login:\s*/'); $telnet->print('admin'); $telnet->waitfor('/password:\s*/'); $telnet->print('Blue'); #$telnet->cmd('ver > C:\\log.txt'); $telnet->cmd('mkdir gy'); You have new mail in /var/spool/mail/root [root@localhost]# But when I'm executing this script it is throwing error messages [root@localhost]# perl tt.pl command timed-out at tt.pl line 12 [root@localhost]# Please help me in this

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  • Deploying 32 and 64 bit COM objects on 64 bit machine from one VS setup project MSI.

    - by hooligan
    I have a Shell Namespace Extension C++ COM DLL that must have both a 32 bit and 64 bit version installed on a 64 bit machine, because when 32 bit applications perform a file- open the dialog that is presented is a 32 bit shell. The problem is that both my 32 bit and 64 bit COM objects have the same progid and the VS setup project will throw an error when including two files with the same progid. How do I get around this issue if I want to maintain the same code for both 32 and 64 bit? Currently I just have two different MSI's (32 and 64) and they both must be ran on the 64 bit machine.

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  • Script to download file and rename according to date on Windows Vista machine?

    - by Dave
    Hi, I need to daily run a script that will download a file from a fixed location and save it on my computer with an appropriate filename-YYYYMMDD-HHSS.ext timestamp. I need a historical record of what that file was at that particular time. I can manually check and see what the changes were, so compairson not needed. (I was looking for an online service that would do this for me, but I think a locally running script on my machine would be good enough). Although i do have php on my machine, i would prefer if its a pure windows builtin solution, just in case i have to (likely) adapt it to someone else's system (non-techies). If someone has something like this and can contribute the code - help would be most appreciated!! D

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  • How can a 1Gb Java heap on a 64bit machine use 3Gb of VIRT space?

    - by Graeme Moss
    I run the same process on a 32bit machine as on a 64bit machine with the same memory VM settings (-Xms1024m -Xmx1024m) and similar VM version (1.6.0_05 vs 1.6.0_16). However the virtual space used by the 64bit machine (as shown in top under "VIRT") is almost three times as big as that in 32bit! I know 64bit VMs will use a little more memory for the larger references, but how can it be three times as big? Am I reading VIRT in top incorrectly? Full data shown below, showing top and then the result of jmap -heap, first for 64bit, then for 32bit. Note the VIRT for 64bit is 3319m for 32bit is 1220m. * 64bit * PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 22534 agent 20 0 3319m 163m 14m S 4.7 2.0 0:04.28 java $ jmap -heap 22534 Attaching to process ID 22534, please wait... Debugger attached successfully. Server compiler detected. JVM version is 10.0-b19 using thread-local object allocation. Parallel GC with 4 thread(s) Heap Configuration: MinHeapFreeRatio = 40 MaxHeapFreeRatio = 70 MaxHeapSize = 1073741824 (1024.0MB) NewSize = 2686976 (2.5625MB) MaxNewSize = -65536 (-0.0625MB) OldSize = 5439488 (5.1875MB) NewRatio = 2 SurvivorRatio = 8 PermSize = 21757952 (20.75MB) MaxPermSize = 88080384 (84.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 268500992 (256.0625MB) used = 247066968 (235.62142181396484MB) free = 21434024 (20.441078186035156MB) 92.01715277089181% used From Space: capacity = 44695552 (42.625MB) used = 0 (0.0MB) free = 44695552 (42.625MB) 0.0% used To Space: capacity = 44695552 (42.625MB) used = 0 (0.0MB) free = 44695552 (42.625MB) 0.0% used PS Old Generation capacity = 715849728 (682.6875MB) used = 0 (0.0MB) free = 715849728 (682.6875MB) 0.0% used PS Perm Generation capacity = 21757952 (20.75MB) used = 16153928 (15.405586242675781MB) free = 5604024 (5.344413757324219MB) 74.24378912132907% used * 32bit * PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 30168 agent 20 0 1220m 175m 12m S 0.0 2.2 0:13.43 java $ jmap -heap 30168 Attaching to process ID 30168, please wait... Debugger attached successfully. Server compiler detected. JVM version is 14.2-b01 using thread-local object allocation. Parallel GC with 8 thread(s) Heap Configuration: MinHeapFreeRatio = 40 MaxHeapFreeRatio = 70 MaxHeapSize = 1073741824 (1024.0MB) NewSize = 1048576 (1.0MB) MaxNewSize = 4294901760 (4095.9375MB) OldSize = 4194304 (4.0MB) NewRatio = 8 SurvivorRatio = 8 PermSize = 16777216 (16.0MB) MaxPermSize = 67108864 (64.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 89522176 (85.375MB) used = 80626352 (76.89128112792969MB) free = 8895824 (8.483718872070312MB) 90.0629940005033% used From Space: capacity = 14876672 (14.1875MB) used = 14876216 (14.187065124511719MB) free = 456 (4.3487548828125E-4MB) 99.99693479832048% used To Space: capacity = 14876672 (14.1875MB) used = 0 (0.0MB) free = 14876672 (14.1875MB) 0.0% used PS Old Generation capacity = 954466304 (910.25MB) used = 10598496 (10.107513427734375MB) free = 943867808 (900.1424865722656MB) 1.1104107034039412% used PS Perm Generation capacity = 16777216 (16.0MB) used = 11366448 (10.839889526367188MB) free = 5410768 (5.1601104736328125MB) 67.74930953979492% used

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  • How to set up virtual hosts properly on a windows machine using Zend Community CE ?

    - by Scott F
    I have set up Zend Server CE on a windows machine and am having the hardest time setting up virtual hosts. No matter what I do, links on my local machine are showing "localhost" in the path causing all images and links to not work properly. I have the following in my vhosts file and while the site loads up, most links show "local host in them". Please help. NameVirtualHost *:80 DocumentRoot D:\zend_server_ce\Apache2\htdocs\domain.dev ServerName www.domain.dev ServerAlias www.domain.dev *.domain.dev domain.dev UseCanonicalName Off #CustomLog D:\zend_server_ce\Apache2\htdocs\domain.dev\logs\access.log # ErrorLog D:\zend_server_ce\Apache2\htdocs\domain.dev\logs\error.log Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all

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  • Using Visual Studio 2005 (32bit) on a Windows 7 64bit machine.

    - by Krakkos
    I need to use Visual Studio 2005 (C++) on my new laptop - a Sony Vaio with Windows 7 64bit.. I don't need to develop for a 64bit environment, my work is all 32bit, so how can I be sure that I can still develop/debug/test for a 32bit target environment using VS2005 on a 64bit machine....? What's the best option: 1) Just install VS2005 on Windows 7 64bit and carry on.. (suspect problems with 64bit runtime libs..?) 2) Dual boot the laptop with Windows XP 32bit. 3) Run some kind of Virtual Machine with Windows XP in it... (I don't have a VM yet, but would look into it) Thanks

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  • Is there an easy way to setup the android emulator to access the LAN of the host machine ?

    - by Longfield
    I would like to access a web service provided by one of the machines on my LAN from the android emulator. If the service was running on the same machine where the emulator is running (called host), I could add a network redirection and access the 10.0.2.2 (host loopback interface in the emulator) with the correct port. However it is running on another machine on the LAN. I guess I could add another redirection on the host additionally to the above one (would have to fight with iptables though ... ), but does a more simple solution exist ?

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  • How to connect 2 virtual hosts running on the same machine?

    - by Gabrielle
    I have 2 virtual hosts running on my Windows XP laptop. One is Ubuntu running inside vmware player. The other is MS virtual PC (so I can test with IE6 ). The Ubuntu virtual host is running my web application with apache. I can point my browser on my laptop at the Ubuntu IP and view my web app. I read this post http://stackoverflow.com/questions/197792/how-to-connect-to-host-machine-from-within-virtual-pc-image and was able to get my Virtual PC to ping my physical machine using the loopback adapter. But I'm stuck on getting my Virtual PC to see my web application running in the Ubuntu vmware player host. I appreciate any suggestions.

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  • How to retrieve files/documents that are not found on the web server machine.

    - by jhorton
    I am trying to create an export feature for a user to be able to download documents into a zip file. I have the feature working when the files are located on my local and I can use an absolute path on my local. But after talking to the infrastructure team, I found out that the documents are not stored on the same machine as the web server but located at a server farm located off site. I can query the database which gives me a file path. But the path is more of a relative path. So can anyone help me understand how to use FileInfo with getting files from another machine. I believe the infrastructure team said there is a virtual drive set up to the outside server. Am I able to use a virtual path some how? Thanks.

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  • How to handle User Authentication for program in client’s local machine?

    - by Daniel
    Which user authentication scheme could be used at following scenario? 1.Application A developed by my company is installed at user's local computer. 2.Users login at my company's website. 3.If login is successful, access to the application A in user's local machine is granted. The development environment is .NET. Is there a secure way to authenticate the user to access the application? I've thought about encrypting the login information entered at the website, and then sending that information to the program at user's local machine for authentication. but I think as long as the client program has the decrypting ability, it is vulnerabe to decompiling,etc. Thanks in advance!

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  • We are able to connect to remote desktop but randomly keyboard does not work in remote machine. Wher

    - by user340071
    Description: The project deals with interaction with the remote desktop connecting through web browser (Internet Explorer). What we did: We have created an activex which installs through the web browser into client machine which lets the user to connect to different servers through web browser. What is in Activex In Activex we used an MSTSC.lib file and by passing the relevant parameters to it. It connects to the remote Desktop. What are the Problems facing now? We are able to connect to remote desktop but randomly keyboard does not work in remote machine. Where as mouse works perfectly.

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  • How can i allow people in my local network to access the web service in my machine?

    - by user1451704
    I have coded a web service using the Axis 2 framework and I can successfully invoke it using a test client (SoapUI) on the local machine after publishing the application in JBoss 5. I can post to the WS endpoint from the local machine and get the expected response. Now i want to allow other machines to access the web service. i changed the "localhost" to "my own fixed IP" adress at the end point location, and turned firewall off, but impossible to access the WS. Note : windows Xp SP3. Any idea ? Thanks in advance !!

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  • How to start SQL Server in a remote machine using code from Delphi?

    - by MLB
    Hi there: I am developing an application (Delphi 7, windows XP) that uses a connection to a remote SQL Server. Sometimes, that server is down, and I want to do something to start it. I was trying to start SQL Server in a local context, and it was fine, it worked... But the point is that I have to start it up from a remote machine. I can see SQL Server status from a remote server, but I can't start it up... Maybe it gets problems because of user and password, but where to specify the login to the remote machine? Do you have any idea to do this??? I am sorry about my English. Thanks.

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