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  • configure /etc/hosts file so ALL applications always use local network when it makes sense to do so?

    - by gkdsp
    I have two Linux CentOS servers setup in a local network. ServerA is 192.168.0.1 and serverB is 192.168.0.2. There's an application on serverA that communicates with serverB using host2.serverAname.com. But, the traffic is blocked on serverB because the port being used has a firewall that only allows traffic on the local network to pass. Thus, serverB needs to see traffic from serverA as originating from 192.168.0.1 (instead of host2.serverA.com). Is there a way I can configure the /etc/hosts file to ensure traffic always sent between the two servers uses local IP addresses, regardless of what hostname is in use, and for ALL applications? If so, could someone walk me through an example? I only have 2 servers, so the simpler the better.

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  • Does it make sense to install an SSD into a 3rd generation MacBook?

    - by Ivan Krechetov
    I've heard that, to really benefit from a solid-state drive, one needs a motherboard fast enough. Do you think it's worth to install an SSD into this laptop? Model Name: MacBook Model Identifier: MacBook3,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.2 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 4 GB Bus Speed: 800 MHz Boot ROM Version: MB31.008E.B02

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  • Does Guest WiFi on an Access Point make any sense?

    - by uos??
    I have a Belkin WiFi Router which offers a feature of a secondary Guest Access WiFi network. Of course, the idea is that the Guest network doesn't have access to the computers/devices on the main network. I also have a Comcast-issues Cable Modem/Router device with mutliple wired ports, but no WiFi-capabilities. I prefer to only run one router/DHCP/NAT instead of both the Comcast Router and the Belkin Router, so I can disable the Routing functions of the Belkin and allow the Comcast Router to But if I disable the Routing functions of the Belkin device, the Guest WiFi network is still available. Is this configuration just as secure as when the Belkin acts as a Router? I guess the question comes down to this: Do Guest WiFi's provide security by 1) only allowing requests to IPs found in-front of the device, or do they work by 2) disallowing requests to IPs on the same subnet? 1) Would mean that Guest WiFi on an access point provides no benefit 2) Would mean that the Guest WiFi functionality can work even if the device is just an access point. Or maybe something else entirely?

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  • Installing ruby 1.9.1 on OS X with RVM, getting error I can't make sense of

    - by Pselus
    I'm trying to update my ruby install on Leopard to at least 1.9.1. I found a tutorial that tells me how to do it with RVM and I get as far as downloading, configuring and compiling the version I want, but during the compile I get errors. When checking the make.error.log file this is the message I get: [2010-11-07 13:43:44] make main.c: In function ‘objcdummyfunction’: main.c:19: warning: implicit declaration of function ‘objc_msgSend’ main.c: At top level: main.c:19: warning: ‘objcdummyfunction’ defined but not used eval.c: In function ‘ruby_cleanup’: eval.c:139: warning: passing argument 1 of ‘ruby_init_stack’ discards qualifiers from pointer target type gc.c: In function ‘garbage_collect_with_gvl’: gc.c:597: warning: cast from pointer to integer of different size w: illegal option -- L usage: w [hi] [user ...] make: [libruby.1.9.1.dylib] Error 1 (ignored) readline.c: In function ‘username_completion_proc_call’: readline.c:1159: error: ‘username_completion_function’ undeclared (first use in this function) readline.c:1159: error: (Each undeclared identifier is reported only once readline.c:1159: error: for each function it appears in.) make[1]: *** [readline.o] Error 1 make: *** [mkmain.sh] Error 1 I have no idea what any of that means. Help?

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  • Ruby: Does it make sense to use REE with Unicorn?

    - by Miko
    I am trying to figure out the optimal server stack for running Rails. As of now, nginx + unicorn seems to be the best approach. However, some folks have suggested running the REE interpreter instead of Ruby plain. Would nginx + unicorn + REE be the most powerful combination, or will plain interpreter suffice?

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  • Does Guest WiFi on an Access Point make any sense? [migrated]

    - by Jason
    I have a Belkin WiFi Router which offers a feature of a secondary Guest Access WiFi network. Of course, the idea is that the Guest network doesn't have access to the computers/devices on the main network. I also have a Comcast-issues Cable Modem/Router device with mutliple wired ports, but no WiFi-capabilities. I prefer to only run one router/DHCP/NAT instead of both the Comcast Router and the Belkin Router, so I can disable the Routing functions of the Belkin and allow the Comcast Router to But if I disable the Routing functions of the Belkin device, the Guest WiFi network is still available. Is this configuration just as secure as when the Belkin acts as a Router? I guess the question comes down to this: Do Guest WiFi's provide security by 1) only allowing requests to IPs found in-front of the device, or do they work by 2) disallowing requests to IPs on the same subnet? 1) Would mean that Guest WiFi on an access point provides no benefit 2) Would mean that the Guest WiFi functionality can work even if the device is just an access point. Or maybe something else entirely?

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  • Does adding 1066Mhz DDR3 SODIMM to a 1600Mhz FSB laptop make sense?

    - by Alain Pannetier
    My previous laptop had 4x4GB 1066 Mhz DDR3. My new laptop instead has only 2x4GB 1600 Mhz DDR3. Using dmidecode I gather my FSB is set to 2300Mhz. Max Speed: 3800 MHz Current Speed: 2300 MHz 2 questions: Can somebody confirm I can safely add two "old" 1066Mhz modules to my new laptop before I treat myself to faster DDR3 modules? I understand this should not slow down the faster 2 1600 Mhz DDR3 modules. Correct? If this is of any relevance, I'm running Linux Mint Maya.

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  • Packard Bell EasyNote MZ35 freezes when AC unplugged and wireless on

    - by Sense Hofstede
    I would like to ask for some help debugging an irritating problem I'm having with my Packard Bell EasyNote MZ35 and Ubuntu 10.10. Always when the laptop is connected to a wireless network and the AC power lead is unplugged—so it's running on battery power—the system freezes. The screen turns black and shows the error GLib-WARNING **: getpwuid_r(): failed due to unknown user id (0), although this error is completely unrelated to the actual problem. Previous searches on the internet indicate that this error is unrelated to the bug I'm experiencing. It is suggested that Ubuntu tries to hibernate or suspend and that you're seeing the black screen running 'behind' the X server. That would explain the fact that curiously you still see—but cannot move—the mouse cursor. I've already set all the values of the GConf keys in /apps/gnome-power-manager/actions/ to 'nothing', disabled all power management actions I could find, but it didn't solve the problem. It is important to note that the freeze doesn't happen immediately after you unplug the AC power lead. The icon in the notification area may have changed already, but the freeze only occurs when the Notify OSD bubble appears that tells you how many time is left with your battery. Does anyone here have a clue about this problem? A workaround or the cause? If anyone could help me with disabling possible suspend/hibernate behaviour that might be related to this issue, that would be appreciated too. This issue has been reported as bug #666852.

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  • When does it makes sense to use a map?

    - by kiwicptn
    I am trying to round up cases when it makes sense to use a map (set of key-value entries). So far I have five categories (see below). Assuming more exist, what are they? Please limit each answer to one unique category, put up an example, and vote up the fascinating ones. Property values (like a bean) age -> 30 sex -> male loc -> calgary Histograms peter -> 1 john -> 7 paul -> 5 Presence, with O(1) performance peter -> 1 john -> 1 paul -> 1 Functions peter -> treatPeter() john -> dealWithJohn() paul -> managePaul() Conversion peter -> pierre john -> jean paul -> paul

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  • iPhone: Does it ever make sense for an object to retain its delegate?

    - by randombits
    According to the rules of memory management in a non garbage collected world, one is not supposed to retain a the calling object in a delegate. Scenario goes like this: I have a class that inherits from UITableViewController and contains a search bar. I run expensive search operations in a secondary thread. This is all done with an NSOperationQueue and subclasses NSOperation instances. I pass the controller as a delegate that adheres to a callback protocol into the NSOperation. There are edge cases when the application crashes because once an item is selected from the UITableViewController, I dismiss it and thus its retain count goes to 0 and dealloc gets invoked on it. The delegate didn't get to send its message in time as the results are being passed at about the same time the dealloc happens. Should I design this differently? Should I call retain on my controller from the delegate to ensure it exists until the NSOperation itself is dealloc'd? Will this cause a memory leak? Right now if I put a retain on the controller, the crashes goes away. I don't want to leak memory though and need to understand if there are cases where retaining the delegate makes sense. Just to recap. UITableViewController creates an NSOperationQueue and NSOperation that gets embedded into the queue. The UITableViewController passes itself as a delegate to NSOperation. NSOperation calls a method on UITableViewController when it's ready. If I retain the UITableViewController, I guarantee it's there, but I'm not sure if I'm leaking memory. If I only use an assign property, edge cases occur where the UITableViewController gets dealloc'd and objc_msgSend() gets called on an object that doesn't exist in memory and a crash is imminent.

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  • DVD ROM is not working

    - by Cyril N.
    (note: I don't know in which StackExchange site to put this question, I'll thank the moderator that will move it to a more appropriate place, if there is a S.E. available for my question). I have a DVD RW drive that is well listed in the bios, and if no CD is in, it is also present in the "My Computer" of my Fedora 16. But when I put a disc on it, the icon disapear from "My Computer", and I can not do anything with this ! (Like erasing a RW disc). I'd like to boot a Fedora 17 Live CD image. I burned it on an other computer but when I try to run it in bios, nothing is done and I'm redirected to Grub of my HD. The command cdrecord -scanbus shows this : wodim: Warning: controller returns wrong size for CD capabilities page. wodim: Cannot get CD capabilities data. 6,1,0 601) 'HD-DT%ST' 'DVD%RAM G@22NP20' '1&04' Removable CD-ROM And when I try to mount manually the disc, I got this error : mount: block device /dev/sr0 is write-protected, mounting read-only mount: /dev/sr0: can't read superblock Here's a paste of dmesg | grep sr0 : [ 5.161265] sr0: scsi-1 drive [ 5.161621] sr 6:0:1:0: Attached scsi CD-ROM sr0 [ 834.545978] sr0: Hmm, seems the drive doesn't support multisession CD's [ 841.731194] sr0: CDROM (ioctl) error, command: Get configuration 46 00 00 00 00 00 00 00 20 00 [ 842.021640] sr 6:0:1:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [ 842.021652] sr 6:0:1:0: [sr0] Sense Key : Aborted Command [current] [ 842.021662] sr 6:0:1:0: [sr0] Add. Sense: No additional sense information [ 842.021672] sr 6:0:1:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00 [ 842.021688] end_request: I/O error, dev sr0, sector 0 [ 842.021697] Buffer I/O error on device sr0, logical block 0 [ 842.023715] sr 6:0:1:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [ 843.048203] sr 6:0:1:0: [sr0] Sense Key : Aborted Command [current] [ 843.048211] sr 6:0:1:0: [sr0] Add. Sense: No additional sense information [ 843.048219] sr 6:0:1:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 01 00 [ 843.048234] end_request: I/O error, dev sr0, sector 0 [ 843.048274] EXT4-fs (sr0): unable to read superblock [ 843.063155] sr0: CDROM (ioctl) error, command: Get configuration 46 00 00 00 00 00 00 00 20 00 [ 843.075904] sr0: CDROM (ioctl) error, command: Get configuration 46 00 00 00 00 00 00 00 20 00 [ 843.220512] sr 6:0:1:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [ 843.220522] sr 6:0:1:0: [sr0] Sense Key : Aborted Command [current] [ 843.220530] sr 6:0:1:0: [sr0] Add. Sense: No additional sense information [ 843.220538] sr 6:0:1:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 01 00 [ 843.220553] end_request: I/O error, dev sr0, sector 0 [ 843.220609] FAT-fs (sr0): unable to read boot sector The lines from Sense Key .. (line 6) to DRIVER_SENSE (line 11) are repeating a lot. I then changed my DVD player with an other spare one I had, and the disc didn't boot neither. I then changed the IDE cable, but still no success. What can I do to make it work? Thanks for your help.

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  • Does it make sense to use a NSFetchedResultsController without an UITableViewController? How are the

    - by dontWatchMyProfile
    I mean... could I also just create a plain old UIViewController and then set up a UITableView myself, plus an NSFetchedResultsController? How much do UITableViewController and NSFetchedResultsController interact with eachother? As far as I see it, UITableViewController is NOT by default already adopting the NSFetchedResultsControllerDelegate protocol. It almost looks like if UITableViewController has been developed without knowing about NSFetchedResultsController. Probably they even did that before developing FRC. Anyways, just a raw guess because the UITableViewController lacks of mentioning FRC at all. So the only thing I see in UITableViewController is that it is already the delegate for a UITableView by adopting the protocol, and it sets up the UITableView instance for me and assigns it internally to it's tableView property. Is that the whole magic of UITableViewController? (note: the nsfetchedresultscontrolle tag is not a typo. SO has a limit for the num of chars...too bad for that missing r, that's why I avoided this tag in my other buch of questions like the plague)

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  • How to find out where alias (in the bash sense) is defined when running Terminal in Mac OS X

    - by Richard Fuhr
    How can I find out where an alias is defined on my system? I am referring to the kind of alias that is used within a Terminal session launched from Mac OS X (10.6.3). For example, if I enter the alias command with no parameters at a Terminal command prompt, I get a list of aliases that I have set, for example, this is one of them alias mysql='/usr/local/mysql/bin/mysql' However, I have searched all over my system using Spotlight and mdfind in various startup files and so far can not find where this alias has been defined ( I did it a long time ago and didn't write down where I assigned the alias).

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  • Does it make sense to have more than one UDP Datagram socket on standby? Are "simultaneous" packets

    - by Gubatron
    I'm coding a networking application on Android. I'm thinking of having a single UDP port and Datagram socket that receives all the datagrams that are sent to it and then have different processing queues for these messages. I'm doubting if I should have a second or third UDP socket on standby. Some messages will be very short (100bytes or so), but others will have to transfer files. My concern is, will the Android kernel drop the small messages if it's too busy handling the bigger ones? Update "The latter function calls sock_queue_rcv_skb() (in sock.h), which queues the UDP packet on the socket's receive buffer. If no more space is left on the buffer, the packet is discarded. Filtering also is performed by this function, which calls sk_filter() just like TCP did. Finally, data_ready() is called, and UDP packet reception is completed."

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  • Does it make sense to have more than one UDP Datagram socket on standby? Are simultaneous packets dr

    - by Gubatron
    I'm coding a networking application on Android. I'm thinking of having a single UDP port and Datagram socket that receives all the datagrams that are sent to it and then have different processing queues for these messages. I'm doubting if I should have a second or third UDP socket on standby. Some messages will be very short (100bytes or so), but others will have to transfer files. My concern is, will the Android kernel drop the small messages if it's too busy handling the bigger ones?

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  • does it makes sense to use int instead of char or nvarchar for a discriminator column if I'm using i

    - by Omu
    I have something like this: create table account ( id int identity(1,1) primary key, usertype char(1) check(usertype in ('a', 'b')) not null, unique(id, usertype) ) create table auser ( id int primary key, usertype char(1) check(usertype = 'a') not null, foreign key (id, usertype) references account(id, usertype) ) create table buser ( ... same just with b ) the question is: if I'm going to use int instead of char(1), does it going to work faster/better ?

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  • Python: does it make sense to refactor this check into it's own method?

    - by Jeff Fry
    I'm still learning python. I just wrote this method to determine if a player has won a game of tic-tac-toe yet, given a board state like:'[['o','x','x'],['x','o','-'],['x','o','o']]' def hasWon(board): players = ['x', 'o'] for player in players: for row in board: if row.count(player) == 3: return player top, mid, low = board for i in range(3): if [ top[i],mid[i],low[i] ].count(player) == 3: return player if [top[0],mid[1],low[2]].count(player) == 3: return player if [top[2],mid[1],low[0]].count(player) == 3: return player return None It occurred to me that I check lists of 3 chars several times and could refactor the checking to its own method like so: def check(list, player): if list.count(player) == 3: return player ...but then realized that all that really does is change lines like: if [ top[i],mid[i],low[i] ].count(player) == 3: return player to: if check( [top[i],mid[i],low[i]], player ): return player ...which frankly doesn't seem like much of an improvement. Do you see a better way to refactor this? Or in general a more Pythonic option? I'd love to hear it!

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  • What is the main purpose and sense to have staging server the same as production?

    - by truthseeker
    Hi, In our company we have staging and production servers. I'm trying to have them in state 1:1 after latest release. We've got web application running on several host and many instances of it. The issue is that I am an advocate of having the same architecture (structure) of web applications on staging and production servers to easily test new features and avoid creating of new bugs with new releases. But not everyone agree with me, and for them is not a such big deal to have different connection between staging application instances. Even maybe to have more application and connections between application on staging than on production server. I would like to ask about pros and cons of such an approach? I mean some good points to agree with me, or some bad why maybe i don't have right. Some examples of consequences and so forth.

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  • Does negate twice (!!) make any sense?

    - by Dbger
    I noticed following usage of negate (!) in our code base, like: int GetIntFromRegistry(); bool bok = !!GetIntFromRegistry(); I am really curious about the usage of !!, it you want to cast the type from int to bool, why not just cast it explicitly use (bool), or static_cast. Is there anything I am missing?

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  • How to set ReceiveBufferSize for UDPClient? or Does it make sense to set? C#

    - by Jack
    Hello all. I am implementing a UDP data transfer thing. I have several questions about UDP buffer. I am using UDPClient to do the UDP send / receive. and my broadband bandwidth is 150KB/s (bytes/s, not bps). I send out a 500B datagram out to 27 hosts 27 hosts send back 10KB datagram back if they receive. So, I should receive 27 responses, right? however, I only get averagely 8 - 12 instead. I then tried to reduce the size of the response down to 500B, yes, I receive all. A thought of mine is that if all 27 hosts send back 10KB response at almost same time, the incoming traffic will be 270KB/s (likely), that exceeds my incoming bandwidth so loss happens. Am I right? But I think even if the incoming traffic exceeds the bandwidth, is the Windows supposed to put the datagram in the buffer and wait for receive? I then suspect that maybe the ReceiveBufferSize of my UdpClient is too small? by default, it is 8092B?? I don't know whether I am all right at these points. Please give me some help.

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  • does a switch idiom make sense in this case?

    - by the ungoverned
    I'm writing a parser/handler for a network protocol; the protocol is predefined and I am writing an adapter, in python. In the process of decoding the incoming messages, I've been considering using the idiom I've seen suggested elsewhere for "switch" in python: use a hash table whose keys are the field you want to match on (a string in this case) and whose values are callable expressions: self.switchTab = { 'N': self.handleN, 'M': self.handleM, ... } Where self.handleN, etc., are methods on the current class. The actual switch looks like this: self.switchTab[selector]() According to some profiling I've done with cProfile (and Python 2.5.2) this is actually a little bit faster than a chain of if..elif... statements. My question is, do folks think this is a reasonable choice? I can't imagine that re-framing this in terms of objects and polymorphism would be as fast, and I think the code looks reasonably clear to a reader.

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  • Practice of checking 'trueness' or 'equality' in conditional statements - does it really make sense?

    - by Senthil
    I remember many years back, when I was in school, one of my computer science teachers taught us that it was better to check for 'trueness' or 'equality' of a condition and not the negative stuff like 'inequality'. Let me elaborate - If a piece of conditional code can be written by checking whether an expression is true or false, we should check the 'trueness'. Example: Finding out whether a number is odd - it can be done in two ways: if ( num % 2 != 0 ) { // Number is odd } or if ( num % 2 == 1 ) { // Number is odd } When I was beginning to code, I knew that num % 2 == 0 implies the number is even, so I just put a ! there to check if it is odd. But he was like 'Don't check NOT conditions. Have the practice of checking the 'trueness' or 'equality' of conditions whenever possible.' And he recommended that I use the second piece of code. I am not for or against either but I just wanted to know - what difference does it make? Please don't reply 'Technically the output will be the same' - we ALL know that. Is it a general programming practice or is it his own programming practice that he is preaching to others?

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  • How to create a platform ontop of CSLA? <-- if in case it make sense

    - by Peejay
    Hi all! here is the senario, i'm developing an application using csla 3.8 / c#.net, the application will have different modules. its like an ERP, it will have accounting, daily time record, recruitment etc as modules. Now the requirement is to check for common entities per module and build a "platform" (<- the boss calls it that way) from it. for example, DTR will have an entity "employee", Recruitment will have "Applicant" so one common entity that you can derive from both that can be put in the platform is "Person". "Person" will contain typical info like name, address, contact info etc. I know it sounds like OOP 101. the thing is, i dont know how i am to go about it. how i wish it was just a simple inheritance but the requirement is like to create an API of some sort to be used by the modules using CSLA. in csla you create smart objects right, inheriting from the base classes of csla like businessListbase, readonlylistbase etc. right? what if for example i created a businessbase Applicant class, it will have properties like salary demand, availability date etc. now for the personal info i will need the "Person" from the "platform" and implement it to the applicant class. so in summary i have several questions: how to create such platform? if such platform is possible, how will it be implemented on each module's entities? (im already inheriting from base clases of csla) if incase 1 and 2 are possible, does it have advantages on development and maintenace of the app? the reason why i'm asking #3 is because the way i see it, even if i am able to create a platform for that, i will be needing to define properties of the platform entity on my module entities so to have validation and all. im sorry if i'm typing nonesense i'm really confused. hope someone could enlighten me. thank you all!

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