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• Help with Abstract Factory Pattern

  - by brazc0re

  I need help with a abstract factory pattern design. This question is a continuation of: Design help with parallel process I am really confused where I should be initializing all of the settings for each type of medium (ex: RS232, TCP/IP, etc). Attached is the drawing on how I am setting up the pattern: As shown, when a medium is created, each medium imposes a ICreateMedium interface. I would assume that the Create() method also create the proper object, such as SerialPort serialPort = new SerialPort("COM1", baud); however, TCPIPMedium would have an issue with the interface because it wouldn't need to initialize a serial port object. I know I am doing something majorly wrong here. I just can't figure it out and have been stuck for a while. What I also get confused on show the interface IMedium will get access to the communication object once it is created so it can write out the appropriate byte[] packet. Any guidance would be greatly appreciated. My main goal is to have the Communicator class spit a packet out without caring which type of medium is active.

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• What's faster, cp -R or unpacking tar.gz files?

  - by Buttle Butkus

  I have some tar.gz files that total many gigabytes on a CentOS system. Most of the tar.gz files are actually pretty small, but the ones with images are large. One is 7.7G, another is about 4G, and a couple around 1G. I have unpacked the files once already and now I want a second copy of all those files. I assumed that copying the unpacked files would be faster than re-unpacking them. But I started running cp -R about 10 minutes ago and so far less than 500M is copied. I feel certain that the unpacking process was faster. Am I right? And if so, why? It doesn't seem to make sense that unpacking would be faster than simply duplicating existing structures.

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• How do I debug an upstart job?

  - by Cerales

  I have the following job in /etc/init/collector: start on runlevel [2345] stop on runlevel [!2345] expect daemon exec /usr/bin/twistd -y /path/to/my/tac/file When I start the job with sudo service collector start, it hangs. If I ctrl-c and run initctl list, I see this: collector start/killed, process 616 I can't see an instance of the twistd daemon in ps, and the HTTP server it's supposed to be providing does not exist. I even tried this without 'expect daemon' and with a simple call to a one-line bash script using a script stanza, and it still doesn't work. I think I'm doing something very wrong. What could it be?

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• Client and Server game update speed

  - by user20686

  I am working on a simple two player networked asteroids game using XNA and the Lidgren networking library. For this set up I have a Lidgren server maintaining what I want to be the true state of the game, and the XNA game is the Lidgren client. The client sends key inputs to the server, and the server process the key inputs against game logic, sending back updates. (This seemed like a better idea then sending local positions to the server.) The client also processes the key inputs on its own, so as to not have any visible lag, and then interpolates between the local position and remote position. Based on what I have been reading this is the correct way to smooth out a networked game. The only thing I don’t get is what value to use as the time deltas. Currently every message the server sends it also sends a delta-time update with it, which is time between the last update. The client then saves this delta time to use for its local position updates, so they can be using roughly the same time deltas to calculate position updates. I know the XNA game update gets called 60 times a second, so I set my server to update the game state at the same speed. This will probably only work as long as the game is working on a fixed time step and will probably cause problems if I want to change that in the future. The server sends updates to clients on another thread, which runs at 10 updates per second to cut down on bandwidth. I do not see noticeable lag in movement and over time if no user input is received the local and remote positions converge on each other as they should. I am also not currently calculating for any latency as I am trying to go one step at a time. So my question is should the XNA client be using its current game time to update the local game state and not being using time deltas sent by the server? If I should be using the clients time delta between updates how do I keep it in-line with how fast the server is updating its game state?

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• How do I find all text with particular background color?

  - by Dave M G

  I have a LibreOffice Writer document that has undergone a process of editing, and sections of the text that needed to be rewritten were highlighted in yellow. As I fixed those sections, I removed the yellow highlight. Now, I want to make sure there are no remaining areas of highlighted text that have not been fixed or possibly the highlight was not removed. It's many hundreds of pages, so a manual scan is unfeasible. Also, it might be that one space or one character got accidentally left highlighted, and I want to ensure I've accounted for them all. How can I search the document to find all instances where text has been highlighted?

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• Is there a difference in page fault rates between CPU bound and I/O bound processes?

  - by user198864

  I was thinking, should there be any difference in expectation of the page fault rate on CPU-bound vs I/O bound processes? At first I thought maybe we could, since CPU-bound processes would likely be using more memory accesses per time quantum, so I expect it would move from locality to locality faster. At the same time, the CPU-bound process is probably given a larger working set... but this doesn't affect the fault overhead as it hits a new locality IF this wasn't pre-paged in. Is there actually any real difference in the page fault rates or am I just musing about something nonexistent? And if there is, how would it impact a real-world OS like linux?

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• ALT+TAB doesn't work properly in Windows 8.1

  - by Marco1

  Holding ALT+TAB will activate the flip 2D to switch from a window to another. The problem is that this function remains active for a very short time and I'm not able to select the window I want in the foreground. I also noticed that when I put the cursor on an icon on the taskbar, the live preview thumbnail disappears quickly. With a safe mode restart the problem is no longer there, all is fine! With a clean install of Windows 8.1(no driver and applications installed) the problem is here again; obviously disappears with a safe mode restart also in this situation. What's the problem? A Windows process or service?

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• init.d service died

  - by jerluc

  Adapting some code from a linux forum, I've added a service script to /etc/init.d on my ubuntu natty server to start/stop/restart node.js It literally was working the first day I made it, but then today, after viewing my website this morning, the server threw a 404, and upon further inspection, the node.js process was gone. So I went to start the service again, only this time, node.js didn't start at all, and ever since I haven't been able to get my service script working. Below is the entire script: #!/bin/sh # # Node Server Startup # case "$1" in start) echo -n "Starting node: " daemon node /usr/local/www/server.js echo touch /var/lock/subsys/node ;; stop) echo -n "Shutting down node: " killall node echo rm -f /var/lock/subsys/node rm -f /var/run/node.pid ;; status) status node ;; restart) $0 stop $0 start ;; reload) echo -n "Reloading node: " killall node -HUP echo ;; *) echo "Usage: $0 {start|stop|restart|reload|status}" exit 1 esac exit 0 Thanks for any help!

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• software to monitor internet usage on an XP PC? (browser + non-browser)

  - by user39316

  Hi Is there any (ideally open source) software for Windows that can be used on a PC, to monitor the usage of internet from that PC? It would need to include both browser and non-browser sources (e.g. a service that sync's calendar to gmail). So any software on your PC that uses would need to be configured to point to this local internet monitoring software/proxy. The monitoring software/proxy then would be configured to point to the company proxy server (address, port & credentials). Things that come to mind that might be close but not really focused on solving this might be perhaps: Charles Proxy, Fiddler 2, SQUID? The idea would be it could give you a daily/weekly/monthly report of internet upload/download usage on a per program/process/service basis for the PC it is being run on. thanks

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• One subdomain is not working

  - by BFTrick

  Hello there, My main domain works just fine - www.example.com and a subdomain set up by another developer works as well - sub1.example.com. But when I try to set another subdomain up I go through the process everything seems to work. The software creates the default files where the subdomain files should go. But when I try to browse there it doesn't work. My host uses Plesk to do all of the hosting stuff. What do you think the problem is? I doubt it is some sort of cache issue because I had problems on my phone which I tried after problems on the pc. Maybe for some reason Plesk needs time to set this up? I have used Cpanel before and that works instantly.

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• raid 5 creation (using mdadm) lots of read/writes on creation: is this normal?

  - by Gbrits

  I created a software raid 5 disk using: mdadm -C /dev/md2 -l5 -n4 /dev/sd[i-l] at the same time I'm using dstat to see io-activity: dstat -c -d -D total,sda1,md2,sdi,sdj,sdk,sdl -l -m -n and notice that disks sd[i-k] are all read from and sdl is written to. Now, I do understand that raid5 has to be configured, but it takes a really long time and all disks are clean & formatted (using xfs) so I figure there might be some kind of shortcut to skip (unnecessary? ) checking.. Is it? The creation is part of a time-critical nightly batch-process (run on amazon ec2) so it's not a one-time thing. Thanks, Geert-Jan

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• Is Clonezilla a good option for a daily batch-file-based backup of a Windows XP PC?

  - by rossmcm

  Having just been through the process of rebuilding a Windows XP desktop machine when the disk died, I'm anxious to make it a lot less painful. I didn't lose any data, but reinstalling everything took ages. Clonezilla seems to be a highly mentioned free backup tool. How easy would it be to implement the following: a nightly unattended backup of the desktop's disk image to another network machine (or a second drive in the machine), hopefully with compression. restore from that image using USB boot media. so that if I come in to work and find the hard drive has tanked, it is just a matter of replacing the dead drive with a new one, booting from the USB stick, choosing the image to restore, and then finding something else to do for an hour or two. When it is finished I would hopefully be back to where I was.

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• Setting CPU cores off-limits to all threads not specified (preferably in Windows 7)

  - by Shinrai

  I have a really specific machine configuration in the works that would really be helped out if there were any way to do this...basically what I'm looking for is the opposite of setting CPU Affinity for a process. I want to be able to tell Windows "No applications except [x] are allowed on [these cores]." Is there any mechanism whatsoever for doing this? (Yes, I am aware of some of the potential issues this could cause and I normally would never fool with processor affinities, since the OS usually does a damned good job itself, but this is a pretty odd situation involving some software that is very CPU-bound constantly having to wait on interrupts and DPCs and things from other threads.)

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• A definition for a CPU second?

  - by dude

  Hey, I'm totally behind this topic. Yesterday I was doing profiling for some script I'm working on, and the unit for time spent was a 'CPU second'. Can anyone remind me with the definition of it? For example for some profiling I got: 200.750 CPU seconds. What does that supposed to mean? At other case and for time consuming process I got: -347.977 CPU seconds, a negative number! Is there anyway I can convert that time, to calendar time? Cheers,

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• Type of AI to tackle this problem?

  - by user1154277

  I posted this on stackoverflow but want to get your recommendations as well as a user on overflow recommended I post it here. I'm going to say from the beginning that I am not a programmer, I have a cursory knowledge of different types of AI and am just a businessman building a web app. Anyways, the web app I am investing in to develop is for a hobby of mine. There are many part manufacturers, product manufacturers, upgrade and addon manufacturers etc. for hardware/products in this hobby's industry. Currently, I am in the process of building a crowd sourced platform for people who are knowledgeable to go in and mark up compatibility between those parts as its not always clear cut if they are for example: Manufacturer A makes a "A" class product, and manufacturer B makes upgrade/part that generally goes with class "A" products, but is for one reason or another not compatible with Manufacturer A's particular "A" class product. However, a good chunk (60%-70%) of the products/parts in the database can have their compatibility inferenced by their properties, For example: Part 1 is type "A" with "X" mm receiver and part 2 is also Type "A" with "X" mm interface and thus the two parts are compatible.. or Part 1 is a 8mm gear, thus all bushings of 8mm from any manufacturer is compatible with part 1. Further more, all gears can only have compatibility relationships in the database with bushing and gear boxes, but there can be no meaningful compatibility between a gear and a rail, or receiver since those parts don't interface. Now what I want is an AI to be able to learn from the decisions of the crowdsourced platform community and be able to inference compatibility for new parts/products based on their tagged attributes, what type of part they are etc. What would be the best form of AI to tackle this? I was thinking a Expert System, but explicitly engineering all of the knowledge rules would be daunting because of the complex relations between literally tens of thousands of parts, hundreds of part types and many manufacturers. Would a ANN (neural network) be ideal to learn from the many inputs/decisions of the crowdsource platform users? Any help/input is much appreciated.

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• How to go about designing an intermediate routing filter program to accept input and forward accordingly?

  - by phileaton

  My predicament: I designed an app, written in Python, to read my mail and check for messages that contain a certain digital signature. It opens these and looks for keywords. If the message contains these keywords, certain related functions area executed on the computer. It is a way I can control my computer from my cell phone without being there. I am still in the beginning stages and it can only currently remotely open and close applications/processes. The obvious issue is security risks. I hoped to spearhead that by requiring and checking for that digital signature. However, my issue comes when I'd like to make this program usable by multiple users. The idea is that the user will send keywords: username and password, for instance, to log into their personal email account and send messages to it to be parsed. Please ignore the security implications of sending non-encoded passwords through email. (Though if you could help me on that part I'd much appreciate it as well, but currently, that is not the scope of my question.) My issue is designing an intermediary process that will take an email/password to read an email and scan for those keywords. The issue is, that the program has to be accessing an email to read the email for the username/password! I have got myself into a loop and cannot figure out how to have this required intermediary program. I could just create an arbitrary email account and have that check for login-creds, but is there a better way of doing this than that? Also, is there a better way of communicating with a computer remotely than this? Especially if the computer is not a server and is behind a router with only a subnet ip? If I am asking this question in the wrong place, I deeply apologize. Any help would be much appreciated!

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• Looking to Implement/Upgrade Your MDM Solution? OOW Has the Session For You

  - by Mala Narasimharajan

  By Bala Mahalingam  Hurray!  Oracle Open World next week.  Oh my God!  I need to plan my calendar for MDM focused sessions. The implementation/upgrade of Oracle Master Data Management solution is an art & science combined. This year at Open World, we have a dedicated session focused on sharing two great implementation stories of Oracle Customer Hub. Also hear from Oracle on the implementation/upgrade approach and methodology for Oracle Master Data Management and Data Quality applications. Here are some of the questions that you might be thinking around the implementation of Oracle MDM solution. If you are in the process of implementation / upgrade or evaluating the options for implementation of MDM solution and you would like to hear directly from T-Mobile and Sony on their roadmap and implementation experience, then I would highly recommend this session.     Hope to see you at Oracle Open World 2012 and stay in touch via our future blogs. Look here for a list of all the MDM sessions at OpenWorld.

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• Computer to act as keyboard

  - by Joe

  Title explains it. Imagine this example, Host computer connects to a Client computer via male/male usb connection. Client computer acknowledges this connection as a new device, in this case a keyboard. The host computer can now send key events to the client computer and the client computer would process them as a normal keyboard event. I did a whole lot of searching in the internet and really have drove down many dead ends. Any tips would be appreciated. Note* this is a physical connection. The client computer should not have to install any software for this to function (The host will completely spoof as a keyboard).

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• Agressive Auto-Updating?

  - by MattiasK

  What do you guys think is best practice regarding auto-updating? Google Chrome for instance seems to auto-update itself as soon as it get's a chance without asking and I'm fine with it. I think most "normal" users benefits from updates being a transparent process. Then again, some more technical users might be miffed if you update their app without permission, as I see it there's 3 options: 1) Have a checkbox when installing that says "allow automatic updates" 2) Just have a preference somewhere that allows you to "disable automatic updates" so that you have to "check for updates manually" I'm leaning towards 2) because 1) feels like it might alienate non-technical users and I'd rather avoid installation queries if possible. Also I'm thinking about making it easy to downgrade if an upgrade (heaven forbid) causes trouble, what are your thoughts? Another question, even if auto-updates are automatically, perhaps they should be announced. If there's new features for example otherwise you might not realize and use them One thing that kinda scares me though is the security implications, someone could theorically hack my server and push out spyware/zombieware to all my customers. It seems that using digital signatures to prevent man-in-the-middle attacks is the least you could do otherwise you might be hooked up to a network that spoofs the address of of update server.

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• Aggressive Auto-Updating?

  - by MattiasK

  What do you guys think is best practice regarding auto-updating? Google Chrome for instance seems to auto-update itself as soon as it get's a chance without asking and I'm fine with it. I think most "normal" users benefits from updates being a transparent process. Then again, some more technical users might be miffed if you update their app without permission, as I see it there's 3 options: 1) Have a checkbox when installing that says "allow automatic updates" 2) Just have a preference somewhere that allows you to "disable automatic updates" so that you have to "check for updates manually" I'm leaning towards 2) because 1) feels like it might alienate non-technical users and I'd rather avoid installation queries if possible. Also I'm thinking about making it easy to downgrade if an upgrade (heaven forbid) causes trouble, what are your thoughts? Another question, even if auto-updates are automatically, perhaps they should be announced. If there's new features for example otherwise you might not realize and use them One thing that kinda scares me though is the security implications, someone could theorically hack my server and push out spyware/zombieware to all my customers. It seems that using digital signatures to prevent man-in-the-middle attacks is the least you could do otherwise you might be hooked up to a network that spoofs the address of of update server.

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• Does Windows 8 support the "start in [folder]" property for shortcuts?

  - by FumbleFingers

  I use Foobar2000 to play music, and for years now I've run it in what they call "portable mode". What that means is that the program itself isn't actually "installed" in the traditional Windows sense. All "non-system" dll's required by the application are in the same folder as the executable; earlier versions of Windows find them there, and everything runs fine. But Windows 8 fails because it doesn't find them. I want things set up this way because I keep Foobar2000 on a portable external hard drive, so I can just move it between different computers without having to go through the Windows install process. With all previous versions of Windows, I could either directly run the application from File Explorer, or create a shortcut on the desktop with the "start in folder" property set to the actual folder containing the program. I can still use the first method, but I want a shortcut! Is there any way to do what I want?

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• batch file to disable network share on Windows XP

  - by Robb

  Loosely related to this question Network Share causing Cygwin to run slowly after 'ls', I'd like to write a little batch file that I can execute to disconnect the host from any network shares and subsequently another batch file to reconnect. Ideally, this would be something that I can execute from a PuTTY terminal, SSHed into the box running cygwin. I'm pretty sure the batch files can be written easily, but I don't know about executing them from a PuTTY terminal. Regardless, I'd still like the batchfiles anyways. For the sake of simplicity my process would be: Log into server via PuTTY Run batch files to disconnect shares Do what I need to do Run batch files to reconnect shares Exit session, closing PuTTY

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• Nginx and low-speed connections: request terminates after 253 seconds

  - by meze

  I'm trying to make nginx to handle static files. All is working fine except that when I throttle my connection speed to 8kbit/s, the loading process of a file just stops after 253-255 seconds (4.2 min according to chrome). No error in the log, the status code is 200 but the response is received partially. If I disable nginx and make apache to send the same file - it loads successfully after 10 minutes. The config I use for debugging is: client_header_buffer_size 16k; large_client_header_buffers 4 8k; client_max_body_size 50m; client_body_buffer_size 16k; client_header_timeout 20m; client_body_timeout 20m; send_timeout 20m; Did i miss some configurations?

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