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• Books for Computer Networking

  - by Altimet Gaandu

  Hi, I am a student of computer engineering from Vasula University, Somalia. We have a subject called Advanced Computer Networks and the following is the list of recommended books: Text Books: 1. B. A. Forouzan, "TCP/IP Protocol Suite", Tata McGraw Hill edition, Third Edition. 2. N. Olifer, V. Olifer, "Computer Networks: Principles, Technologies and Protocols for Network design", Wiley India Edition, First edition. References: 1. W.Richard Stevens, "TCP/IP Volume1, 2, 3", Addison Wesley. 2. D.E.Comer,"TCP/IPVolumeI and II", PearsonEducation. . 3.W.R. Stevens, "Unix Network Programming", Vol. 1, Pearson Education. 4. J.Walrand, P. Var~fya, "High Performance Communication Networks", Morgan Kaufmann. . 5. A.S.Tanenbaum,"Computer Networks", Pearson Education, Fourth Edition. But we have been unable to find these either in the market or on the internet (read: torrents). Please provide download links to any of these books and oblige. Thanks.

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• Learning PHP - start out using a framework or no?

  - by Kevin Torrent

  I've noticed a lot of jobs in my area for PHP. I've never used PHP before, and figure if I can get more opportunities if I pick it up then it might be a good idea. The problem is that PHP without any framework is ugly and 99% of the time really bad code. All the tutorials and books I've seen are really lousy - it never shows any kind of good programming practice but always the quick and dirty kind of way of doing things. I'm afraid that trying to learn PHP this way will just imprint these bad practices in my head and make me waste time later trying to unlearn them. I've used C# in the past so I'm familiar with OOP and software design patterns and similar. Should I be trying to learn PHP by using one of the better known frameworks for it? I've looked at CakePHP, Symfony and the Zend Framework so far; Zend seems to be the most flexible without being too constraining like Cake and Symfony (although Symfony seemed less constraining than CakePHP which is trying too hard to be Ruby on Rails), but many tutorials for Zend I've seen assume you already know PHP and want to learn to use the framework. What would be my best opportunity for learning PHP, but learning GOOD PHP that uses real software engineering techniques instead of spaghetti code? It seems all the PHP books and resources either assume you are just using raw PHP and therefore showcase bade practices, or that you already know PHP and therefore don't even touch on parts of the language.

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• Best (functional?) programming language to learn coming from Mathematica

  - by Will Robertson

  As a mechanical engineering PhD student, I haven't had a great pedigree in programming as part of my “day job”. I started out in Matlab (having written some Hypercard and Applescript back in the day, and being introduced to Ada, of all things, in my 1st undergrad year), learned to program—if you can call it that—in (La)TeX; and finally discovered and fell for Mathematica. Now I'm interested in learning a "real" programming language that I can enjoy in the same sort of style as Mathematica, which tries to stress functional programming since it seems to map more nicely to how certain kinds of mathematics can be written algorithmically. So which functional language should I learn? I guess the obvious answer is “as many as possible”, but let's start out humble and give a single, well-considered option a good crack. I've heard good things about, say, Haskell and Scala, but I wonder if (given my non–computer science background) I'd be better off starting in more “grounded” territory and going with Ruby or Python (the latter having the big advantage of being used for Sage, which I'd also like to investigate…after my PhD). Well, I guess this is pretty subjective, so perhaps I could rephrase: would it be better to start looking at Haskell (say) straight after an ad-hoc education to functional programming in Mathematica, or will I get more out of learning Python (say) first? In reference to the question "what do I want to do with it?", I guess my answer is "fun, and learning more". I've got this list of languages that I'd like to look at, and I don't know how to trim them down. And I'd rather start with something a little higher-level than C simply so that I can be somewhat productive without having to re-invent many wheels for any code I'd like to write.

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• Call AsyncTask methods from another class/service (callbacks?)

  - by TiGer

  Hi, I was wondering if it's possible to call specific methods defined within the AsynTask class from another class and/or service ? In my specific case I have a Service playing some sounds, but the sound is selected from a List with available sounds... When a sounds is selected it is downloaded from my home server, this takes some time (not much, let's say around the 3-4 seconds, the sounds/effects aren't big in size)... So my problem at the moment is that I have a service to play those sounds, and when I select one I wanted to show a progressdialog... The way (if I understood correctly) is to use an AsyncTask, but the only thing the AsyncTask will do is telling my Service to play a specific sound from my server... So there is no "callback" from the service to the Asynctask... How can I achieve that ? How can I call a running AsyncTask, which sits in another class, and tell him all work is done and thus he can stop showing the ProgressDialog ? Or am I over-engineering it and there are other ways ? Thanks in advance...

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• printSoln module problem

  - by dingo_d

  Hi I found in book:Numerical Methods in engineering with Python the module run_kut5, but for that module I need module printSoln, all provided in the book. Now I cp the code, made necessary line adjustments and so. The code looks like: # -*- coding: cp1250 -*- ## module printSoln ''' printSoln(X,Y,freq). Prints X and Y returned from the differential equation solvers using printput frequency ’freq’. freq = n prints every nth step. freq = 0 prints initial and final values only. ''' def printSoln(X,Y,freq): def printHead(n): print "\n x ", for i in range (n): print " y[",i,"] ", print def printLine(x,y,n): print "%13.4e"% x,f for i in range (n): print "%13.4e"% y[i], print m = len(Y) try: n = len(Y[0]) except TypeError: n = 1 if freq == 0: freq = m printHead(n) for i in range(0,m,freq): printLine(X[i],Y[i],n) if i != m - 1: printLine(X[m - 1],Y[m - 1],n) Now, when I run the program it says: line 24, in <module> m = len(Y) NameError: name 'Y' is not defined But I cp'd from the book :\ So now when I call the run_kut module I get the same error, no Y defined in printSoln... I'm trying to figure this out but I suck :( Help, please...

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• VirtualBox - bridged adapter settings fail in Windows 7 host

  - by pcampbell

  Consider a Windows 7 host where the VirtualBox guest is configured to use Bridged Adapter. An exception is raised when starting this guest machine: Failed to open/create the internal network HostInterfaceNetworking (VERR_SUPDRV_COMPONENT_NOT_FOUND) Result Code: E_FAIL (0x80004005) What resolution is there to this problem for Bridged Adapters in VirtualBox? The solutions attempted: changed Adapter Type to all available choices. No changes. uninstall VirtualBox, reboot host, re-install VirtualBox. No change in behaviour. edited the machine's .xml file, wiping out all <Network> <Adapter> nodes. Had VirtualBox re-create those nodes. No change. Host Details Oracle VirtualBox 3.2.4 (release 62467) Windows 7 x86

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• Unable to remove file using 'rm'

  - by Alvin Sim

  Hi all, In one of our severs (IBM AIX), we have a file in path /data/1002/ which we were not able to remove or delete using the 'rm' command. The error message we got is "rm: A1208001.002: A file or directory in the path name does not exist." With the "-f" option, no error message was displayed, but the file is still there. This file has a '0' byte size and when i use the command "touch A120001.002", i see two files with the same file name in that directory. The directory listing is as below: $ ls -l total 56 -rwxrwxrwx 1 oracle dba 0 Feb 09 11:57 S1208001.002 drwxrwxrwx 4 nobody dba 24576 Feb 09 13:36 backup How do I remove this bogus fie? Thanks.

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• Getting macro keys from a razer blackwidow to work on linux

  - by Journeyman Geek

  I picked up a razer blackwidow ultimate that has additional keys meant for macros that are set using a tool that's installed on windows. I'm assuming that these arn't some fancypants joojoo keys and should emit scancodes like any other keys. Firstly is there a standard way to check these scancodes in linux? Secondly how do i set these keys to do things in command line and x based linux setups? My current linux install is xubuntu 10.10, but i'll be switching to kubuntu once i have a few things fixed up. Ideally the answer should be generic and system-wide Things i have tried so far: showkeys from the built in kbd package (in a seperate vt) - macro keys not detected xev - macro keys not detected lsusb and evdev output this ahk script's output suggests the M keys are not outputting standard scancodes Things i need to try snoopy pro + reverse engineering (oh dear) Wireshark - preliminary futzing around seems to indicate no scancodes emitted when what i seem to think is the keyboard is monitored and keys pressed. Might indicate additional keys are a seperate device or need to be initialised somehow. Need to cross reference that with lsusb output from linux, in 3 scenarios - standalone, passed through to a windows VM without the drivers installed, and the same with. LSUSB only detects one device on a standalone linux install It might be useful to check if the mice use the same razer synapse driver , since that means some variation of razercfg might work (not detected. only seems to work for mice) Things i have Have worked out: In a windows system with the driver, the keyboard is seen as a keyboard and a pointing device. And said pointing device uses, in addition to your bog standard mouse drivers.. a driver for something called a razer synapse. Mouse driver seen in linux under evdev and lsusb as well Single Device under OS X apparently, though i have yet to try lsusb equivilent on that Keyboard goes into pulsing backlight mode in OS X upon initialisation with the driver. This should probably indicate that there's some initialisation sequence sent to the keyboard on activation. They are, in fact, fancypants joojoo keys. Extending this question a little I have access to a windows system so if i need to use any tools on that to help answer the question, its fine. I can also try it on systems with and without the config utility. The expected end result is still to make those keys usable on linux however. I also realise this is a very specific family of hardware. I would be willing to test anything that makes sense on a linux system if i have detailed instructions - this should open up the question to people who have linux skills, but no access to this keyboard The minimum end result i require I need these keys detected, and usable in any fashion on any of the current graphical mainstream ubuntu varients

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• Install "Massive Coupon"

  - by ffffff

  I'want to install "Massive Coupon" http://github.com/robstyles/Massive-Coupon---Open-source-groupon-clone I've set up apache2 + mod_wsgi + mysql on Ubuntu 9 And written the following settings.py # Django settings for massivecoupon project. import socket, os . . DATABASE_ENGINE = 'mysql' # 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'. DATABASE_NAME = 'grouponpy' # Or path to database file if using sqlite3. DATABASE_USER = 'grouponpy' # Not used with sqlite3. DATABASE_PASSWORD = 'password' # Not used with sqlite3. DATABASE_HOST = 'localhost' # Set to empty string for localhost. Not used with sqlite3. DATABASE_PORT = '' # Set to empty string for default. Not used with sqlite3. What I have to do additional then?

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• Kickstart PXE Boot Installation not working

  - by Anshuman

  I tried installing PXE Boot Installation Server on RHEL 6.0. I seem to have done everything according to the page: http://www.linux-sxs.org/internet_serving/pxeboot.html. In my case, the client boots, gets DHCP IP address from our server, connects to the Kickstart server too, but then nothing happens. It shows: Loading 192.168.1.101: pxe.linux.0 ..... 192.168.1.101 in my kickstart server. Did any one face such a situation? I'm using a test env on Oracle Virtualbox with DNS Server on RHEL 6.0, DHCP Server on CentOS 6.0 and Kickstart server on RHEL 6.0. The image I'm trying to install is that of REHL 6.0! Awaiting some responses! Cheers, Anshuman

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• PHP ZendOptimizer on Red Hat Enterprise Linux

  - by Jacob Kristensen

  I would like to install FlashMoto and the requirements are not unreasonable: PHP 5.2.1 or higher, Zend Optimizer 3.3 or higher. However my RHEL 5.4 provides me with PHP 5.1.6. So I tried the remi repository http://rpms.famillecollet.com/ but it gave me PHP 5.3.1 and Zend Optimizer from zend.com does not support anything higher than 5.2.x. I also tried the dag repo but it does not have PHP in any version. I also tried some RPMs that Oracle provides on their homepage but they don't provide php-mbstring that I also need. Does anyone know how to get PHP 5.2.1 installed on a RHEL 5.4? Then I can probably fix install the Zend thing. Thanks in advance.

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• What is the data transfer speeds within the disk, to other devices?

  - by Kumar

  I use Debian 6 on a HP Elitbook 6930 with 2Gigs of RAM. I was copying two AVI files, 1.5 GB in total, and noticed that the data copying was done at the rate of 4MB/sec. When I copy same AVIs to my Western Digital Passport 25G USB plugin drive the data transfer speed is 11+MB/sec. This speed is different if I plugin the drive to different USB ports. Interestingly, at work I also downloaded a 16MB IE8 exe on my virtual xp, run inside Oracle Sun Virtual Box, and it was downloaded AND saved within a second. We have a high speed network at work. :-) Why and how this difference in data speeds is possible?

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• Citrix XenServer iSCSI shared disk?

  - by chsguy

  I am running Citrix XenServer Essentials 5.5, with VMs stored on an EqualLogic iSCSI shelf, using XenServer's StorageLink. I would like to create a "virtual disk" that can be attached to multiple VMs. This would be used for a cluster file system like OCFS2 or GFS. This doesn't seem possible using the XenCenter GUI and I can't find anything online about how to do it. I realize I could simply expose the iSCSI network to the VM and have the VM initiate its own iSCSI, but that creates a lot of security challenges. This was pretty easy to do on Oracle VM Server, which is Xen based, so I know it's not a limitation of Xen itself. Maybe there is an "xe-" command for this? Thanks for any suggestions you can provide.

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• vmware server end of life, where to go now?

  - by matnagel

  We have some virtual machines on vmware server 2.x running on 64 bit hardware and quite happy with it. As vmware server will no longer be offered we are thinking to migrate to ESXi, which seems is free. We will have to install the specialized network cards but that's a minor problem. But once left alone with a quite silently discontinued product there is some resistance to vmware. VirtualBox seems to work: http://blogs.oracle.com/virtualization/2010/06/migrating_from_vmware_to_virtu.html What other free (of licencing cost) options are there? We have windows server 2003 32 bit VMs and also linux 32 and 64 bit VMs to migrate. So xen does not seem an option, which does not run microsoft OSes.

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• jetty crash trouble shooting

  - by user886356

  Recently I switch to amazon ec2 + jetty9 + oracle jdk7_u45 for cost saving. I found the jetty server is very unstable. It crash randomly without any jvm dump file. Tried to enable stdout with the dumpBeforeStop=TRUE. It won't append the dump messages to stderrout.log before crash. Seems it isn't related to OutOfMemoryError as I have enabled the gc verbose options and found it still has many available memory before crash. : 162604K-3340K(176960K), 0.2240040 secs] 248332K-89101K(373568K), 0.2736860 secs] [Times: user=0.01 sys=0.01, real=0.28 secs] Tried to downgrade to jetty8 with different jdk combination (jdk6 / jdk7). Still got the same problem. Tried to remove all jvm options and using "sudo java -jar start.jar" to run jetty. Still crash. Any other way to shoot the problem?

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• Change Management Software

  - by Andrew

  I manage an 80,000 user CIS application written in Uniface. Every form in the application, and many of its processes, are represented by .frm files. We have hundreds of these files and 5 instances of the application. Instances include multiple production installations which must be kept sync'd. We do not get MD5 from our vendor for files that are released to us as patches. We have been using a spreadsheet to track changes, but this is far from ideal. Is there a commercial application that can be purchased that will allow us to track changes to the instances? Thank you all! EDIT: Patches are released as zip files with either FRM files in them or SQL files or a mix of both. SQL files will contain statements that need to be run in Oracle. Patches are also assigned unique patch numbers.

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• Multicast doesn't seem to be working on RHEL 5.5

  - by NullUser

  I'm trying to install Oracle Grid Infrastructure on two machines. Their documentation states You must enable multicasting for the cluster on the IP address subnet ranges 224.0.0.0/24 and 230.0.1.0/24 So I ran: route add -net 224.0.0.0/24 dev eth2 route add -net 230.0.1.0/24 dev eth2 route -n produces: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 230.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 224.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 # and others An ifconfig eth2 shows, among other things, UP BROADCAST RUNNING MULTICAST. However, when I run their multicast test utility, it fails me: Test for Multicast address 230.0.1.0 Sep 3 19:40:39 | Multicast Failed for eth2 using address 230.0.1.0:42000 Test for Multicast address 224.0.0.251 Sep 3 19:41:10 | Multicast Failed for eth2 using address 224.0.0.251:42001 What am I doing wrong?

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• Java version indicates SE 6, Java Control Panel SE 8

  - by Mariogs

  So I'm trying to get the Java 7 as the default version on my machine, running Mac OS X 10.9.3. When I run: java -version I get: java version "1.6.0_65" Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609) Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode) When I run: javac -version I get: javac 1.6.0_65 When I go into System Preferences -- Java -- Update, I see: Your system has the recommended vesion of Java. Java 8 Update 05. I guess I have a few questions: 1) Why does my Java Control Panel claim I have Java 8, but my work in the terminal (when checking my Java version) says otherwise? 2) I just downloaded the .dmg file for Java SE 7 from Oracle's site and installed, though it's nowhere to be seen... Thanks for the help, Mariogs

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• Instant database snapshot

  - by raj

  My product uses oracle 9 database in its backend. every week the new release of the product is launched which will want to fire some DML, DDL queries to the database. I usually test the product release in a dummy database before applying it in the main database. I create a database dump using exp command, then import them into dummy database using imp. then i test the product in the dummy database and checks if there are any errors. This exp and imp takes about 3 hours to complete. Is there any alternative as : instant snapshot of the live database (which will be independent of the live one)? or is there any option to keep dummydatabase in sync with the originl database always. Yhis can be done by making the product firing DML&DDL queries to both the databases.. but this will be a HUGE performance problem.. how can i overcome this?

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• Named ports in windows!

  - by Jay

  I wonder how stuff like this works in windows (xp and other that have telnet): Start-> Run -> cmd -> telnet <xyz.com> http Start-> Run -> cmd -> telnet <xyz.com> pop3 Start-> Run -> cmd -> telnet <xyz.com> smtp Are these "named" ports? Only windows knows that it has to substitute port numbers coz these are standard ports? Is there way I could create such a named port on windows? I would like something like this : telnet <xyz.com> oracle to translate to telnet <xyz.com> 1521

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• alternatives to SGE

  - by bmargulies

  Once upon at time there was the free SGE from Sun. tricky to install and configure, but functional and free. Now we've got: open source packages on Ubuntu that don't quite work out of the box (details on request). the actual source behind them, with a build process that depends on the c-shell and other obsolescences, available from two competing locations. a commercial packaging from Oracle a commercial package from Univa What I am really wishing for is something with the basic capabilities of this that is simple to install and maintain. Heck, I'd take a front-end to hadoop that just queues and distributes simple shell-script-defined jobs.

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• The Koyal Group Info Mag News¦Charged building material could make the renewable grid a reality

  - by Chyler Tilton

  What if your cell phone didn’t come with a battery? Imagine, instead, if the material from which your phone was built was a battery. The promise of strong load-bearing materials that can also work as batteries represents something of a holy grail for engineers. And in a letter published online in Nano Letters last week, a team of researchers from Vanderbilt University describes what it says is a breakthrough in turning that dream into an electrocharged reality. The researchers etched nanopores into silicon layers, which were infused with a polyethylene oxide-ionic liquid composite and coated with an atomically thin layer of carbon. In doing so, they created small but strong supercapacitor battery systems, which stored electricity in a solid electrolyte, instead of using corrosive chemical liquids found in traditional batteries. These supercapacitors could store and release about 98 percent of the energy that was used to charge them, and they held onto their charges even as they were squashed and stretched at pressures up to 44 pounds per square inch. Small pieces of them were even strong enough to hang a laptop from—a big, fat Dell, no less. Although the supercapacitors resemble small charcoal wafers, they could theoretically be molded into just about any shape, including a cell phone’s casing or the chassis of a sedan. They could also be charged—and evacuated of their charge—in less time than is the case for traditional batteries. “We’ve demonstrated, for the first time, the simple proof-of-concept that this can be done,” says Cary Pint, an assistant professor in the university’s mechanical engineering department and one of the authors of the new paper. “Now we can extend this to all kinds of different materials systems to make practical composites with materials specifically tailored to a host of different types of applications. We see this as being just the tip of a very massive iceberg.” Pint says potential applications for such materials would go well beyond “neat tech gadgets,” eventually becoming a “transformational technology” in everything from rocket ships to sedans to home building materials. “These types of systems could range in size from electric powered aircraft all the way down to little tiny flying robots, where adding an extra on-board battery inhibits the potential capability of the system,” Pint says. And they could help the world shift to the intermittencies of renewable energy power grids, where powerful batteries are needed to help keep the lights on when the sun is down or when the wind is not blowing. “Using the materials that make up a home as the native platform for energy storage to complement intermittent resources could also open the door to improve the prospects for solar energy on the U.S. grid,” Pint says. “I personally believe that these types of multifunctional materials are critical to a sustainable electric grid system that integrates solar energy as a key power source.”

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• Is it me or is developing web based data entry GUIs a big pain?

  - by GregH

  Maybe it's me or maybe it isn't. I don't have a huge amount of experience of developing web based data entry software but do have some. I used to do it quite a bit years ago. Used to use Oracle Forms, Visual Studio, various 4th generation languages, and performing the user interface layout used to be a snap. Now doing the user interface for developing web applications seems to be a huge pain in the rear. Just trying to get text entry fields and widgets to go where they are supposed to go on the screen is a total pain. You have to know Javascript, CSS, JQuery, HTML, etc. There must be an easier way to develop data entry forms that produce the needed underlying code for a web page. Maybe I'm just not looking in the right place. There must be some WYSIWYG GUI development tools for the web for developing data entry forms out there. Anybody know of any?

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• Starting MySQL after installing MySQL 5.5 from .rpm

  - by user593294

  I m using Ubuntu 11.04. I have installed MySQL server and client ver 5.5.13. The problem i have is actually to start MySQL after installing it from the .rpm package obtained from the oracle site. I m not able to find any guide for configuring MySQL after completing its installation. I installed it using alien. I found some guides for older version of ubuntu which i find irrelevant. So Please help me in configuring and starting MySQL successfully.

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• Get cryptic error when trying to create a snapshot of any of my VMs

  - by Zolt

  I'm using Oracle VM VirtualBox. I have 6 VMs that I've imported. When I click on an individual VM, and then click the camera image (or Ctrl+Shift+S) to take a snapshot, the snapshot process fails and VirtualBox gives the following error: Failed to create a snapshot of the virtual machine vmName. Details: Result Code: VBOX_E_IPRT_ERROR (0x80BB0005) This happens not only for one of my VMs, but all of them, if I try to take a snapshot of each one separately, one at a time. My computer is a Windows 7 machine. I have 200 GB free on my hard drive, and I see no reason why the error should occur. I can import VMs, run them, and clone then without any problems. Can anyone tell me what to do to fix the issue?

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