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• Valgrind 'noise', what does it mean?

  - by Chris Huang-Leaver

  When I used valgrind to help debug an app I was working on I notice a huge about of noise which seems to be complaining about standard libraries. As a test I did this; echo 'int main() {return 0;}' | gcc -x c -o test - Then I did this; valgrind ./test ==1096== Use of uninitialised value of size 8 ==1096== at 0x400A202: _dl_new_object (in /lib64/ld-2.10.1.so) ==1096== by 0x400607F: _dl_map_object_from_fd (in /lib64/ld-2.10.1.so) ==1096== by 0x4007A2C: _dl_map_object (in /lib64/ld-2.10.1.so) ==1096== by 0x400199A: map_doit (in /lib64/ld-2.10.1.so) ==1096== by 0x400D495: _dl_catch_error (in /lib64/ld-2.10.1.so) ==1096== by 0x400189E: do_preload (in /lib64/ld-2.10.1.so) ==1096== by 0x4003CCD: dl_main (in /lib64/ld-2.10.1.so) ==1096== by 0x401404B: _dl_sysdep_start (in /lib64/ld-2.10.1.so) ==1096== by 0x4001471: _dl_start (in /lib64/ld-2.10.1.so) ==1096== by 0x4000BA7: (within /lib64/ld-2.10.1.so) * large block of similar snipped * ==1096== Use of uninitialised value of size 8 ==1096== at 0x4F35FDD: (within /lib64/libc-2.10.1.so) ==1096== by 0x4F35B11: (within /lib64/libc-2.10.1.so) ==1096== by 0x4A1E61C: _vgnU_freeres (vg_preloaded.c:60) ==1096== by 0x4E5F2E4: __run_exit_handlers (in /lib64/libc-2.10.1.so) ==1096== by 0x4E5F354: exit (in /lib64/libc-2.10.1.so) ==1096== by 0x4E48A2C: (below main) (in /lib64/libc-2.10.1.so) ==1096== ==1096== ERROR SUMMARY: 3819 errors from 298 contexts (suppressed: 876 from 4) ==1096== malloc/free: in use at exit: 0 bytes in 0 blocks. ==1096== malloc/free: 0 allocs, 0 frees, 0 bytes allocated. ==1096== For counts of detected errors, rerun with: -v ==1096== Use --track-origins=yes to see where uninitialised values come from ==1096== All heap blocks were freed -- no leaks are possible. You can see the full result here: http://pastebin.com/gcTN8xGp I have two questions; firstly is there a way to suppress all the noise? --show-below-main is set to no by default, but there doesn't appear to be a --show-after-main equivalent.

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• creating cookbooks and roles with out chef-server

  - by Josh Nankin

  I want to run: knife role create blah I use chef-solo and don't need knife to connect to a server. I just would like to run these commands for helping me prepopulate the files quickly. Everytime I run of these commands it attempts to connect to a server. This does not happen for knife cookbook create blah Double-ewe tee eff. Update: I've noticed this is the case for databags and environments as well. I've read elsewhere that knife is primarily intended for use with the chef-server API, but it seems ridiculous that something like this can't be done. It just needs to save the darn file.

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• Problem Loading multiple textures using multiple shaders with GLSL

  - by paj777

  I am trying to use multiple textures in the same scene but no matter what I try the same texture is loaded for each object. So this what I am doing at the moment, I initialise each shader: rightWall.SendShaders("wall.vert","wall.frag","brick3.bmp", "wallTex", 0); demoFloor.SendShaders("floor.vert","floor.frag","dirt1.bmp", "floorTex", 1); The code in SendShaders is: GLuint vert,frag; glEnable(GL_DEPTH_TEST); glEnable(GL_TEXTURE_2D); char *vs = NULL,*fs = NULL; vert = glCreateShader(GL_VERTEX_SHADER); frag = glCreateShader(GL_FRAGMENT_SHADER); vs = textFileRead(vertFile); fs = textFileRead(fragFile); const char * ff = fs; const char * vv = vs; glShaderSource(vert, 1, &vv, NULL); glShaderSource(frag, 1, &ff, NULL); free(vs); free(fs); glCompileShader(vert); glCompileShader(frag); program = glCreateProgram(); glAttachShader(program, frag); glAttachShader(program, vert); glLinkProgram(program); glUseProgram(program); LoadGLTexture(textureImage, texture); GLint location = glGetUniformLocation(program, textureName); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, texture); glUniform1i(location, 0); And then in the main loop: rightWall.UseShader(); rightWall.Draw(); demoFloor.UseShader(); demoFloor.Draw(); Which ever shader is initialised last is the texture which is used for both objects. Thank you for your time and I appreciate any comments.

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• Debug not working in Monodroid with a Galaxy Nexus

  - by MaxM

  I'm starting to work with Monodroid testing on a Galaxy Nexus from MonoDevelop for Mac. Running the default Android project without debugging works. But if I try to debug it either says this in the Application Output pane: Error trying to detect already running process Or it outputs the following to logcat: I/ActivityManager( 448): Start proc monotest.monotest for activity monotest.monotest/monotest.Activity1: pid=3075 uid=10068 gids={3003} D/dalvikvm( 3063): GC_CONCURRENT freed 98K, 89% free 478K/4096K, paused 0ms+1ms I/dalvikvm( 3075): Turning on JNI app bug workarounds for target SDK version 8... V/PhoneStatusBar( 524): setLightsOn(true) I/ActivityThread( 3075): Pub monotest.monotest.__mono_init__: mono.MonoRuntimeProvider D/dalvikvm( 3075): Trying to load lib /data/data/monotest.monotest/lib/libmonodroid.so 0x41820850 D/dalvikvm( 3075): Added shared lib /data/data/monotest.monotest/lib/libmonodroid.so 0x41820850 D/OpenGLRenderer( 683): Flushing caches (mode 1) E/mono ( 3075): WARNING: The runtime version supported by this application is unavailable. E/mono ( 3075): Using default runtime: v2.0.50727 D/OpenGLRenderer( 683): Flushing caches (mode 0) I/monodroid-gc( 3075): environment supports jni NewWeakGlobalRef I/mono ( 3075): Stacktrace: I/mono ( 3075): D/AndroidRuntime( 3093): D/AndroidRuntime( 3093): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<< D/AndroidRuntime( 3093): CheckJNI is OFF D/AndroidRuntime( 3093): Calling main entry com.android.commands.am.Am D/dalvikvm( 3021): GC_CONCURRENT freed 359K, 3% free 15630K/16071K, paused 2ms+4ms D/Zygote ( 119): Process 3075 terminated by signal (11) I/ActivityManager( 448): Process monotest.monotest (pid 3075) has died. I tried using another device (a Galaxy Tab) and it worked fine. I also tried the suggestion from here and it didn't help.

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• Django Database design -- Is this a good stragety for overriding defaults

  - by rh0dium

  Hi SO's I have a question on good database design practices and I would like to leverage you guys for pointers. The project started out simple. Hey we have a bunch of questions we want answered for every project (no problem) Which turned into... Hey we have so many questions can we group them into sections (yup we can do that) Which lead into.. Can we weight these questions and I don't really want some of these questions for my project (Yes but we are getting difficult) And then I'm thinking they will want to have each section have it's own weight.. Requirements So there's the requirements - For n number of project Allow a admin member the ability select the questions for a project Allow the admin member to re-weigh or use the default weights for the questions Allow the admin member to re-weight the sections Allow team members to answer the questions. So here is what I came up with. Please feel free to comment and provide better examples models.py from django.db import models from django.contrib.sites.models import Site from django.conf import settings class Section(models.Model): """ This describes the various sections for a checklist: """ name = models.CharField(max_length=64) description = models.TextField() class Question(models.Model): """ This simply provides a simple way to list out the questions. """ question = models.CharField(max_length=255) answer_type = models.CharField(max_length=16) description = models.TextField() section = models.ForeignKey(Section) class ProjectQuestion(models.Model): """ These are the questions relevant to the project """ question = models.ForeignKey(Question) answer = models.CharField(max_length=255) required = models.BooleanField(default=True) weight = models.FloatField(default = XXX) class Project(models.Model): """ Here is where we want to gather our questions """ questions = models.ManyToManyField(ProjectQuestion) Immediate questions: - When I start a project - any ideas on how to "pre-populate" the questions (and ultimately the weights) for the project? - Is there a generally accepted method for doing this process that I am missing? Basically the idea that you refer to the questions overide your own default weight, and store the answer? - It appears that a good chuck of the work will be done in the views and that a lot of checking will need to occur there? Is that OK? Again - feel free to give me better strategies!! Thanks

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• Increase performance of Samsung 830 256GB SSD

  - by Robert Koritnik

  I have a Samsung 830 SSD in my notebook connected to a SATA interface. This is a rather old HP notebook nc8430 which means SATA is SATA I and not II or even III that disk supports. But SATA I still supports speeds up to 150MB/s so I expected at least double values as per image below. CrystalDiskMark shows rather slow performance: I've been using this SSD for over a year now and I would like to know what to do to make it blazingly fast as other reports say it should be? Edit As suggested I'm adding AS SSD screenshot of the test. And Samsung Magician's benchmark which is likely biased...

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• Trouble accessing network drives in Windows 7

  - by Warlax

  Hi, Recently purchased a LaCiE network drive. Connected it to my router, configured it, added a user for myself. Installed the "Network Assistant" that came with it - no problem. Went to My Computer Network, found the network drive - was prompted for a login/password to see the contents, types \user and password (leading slash to get rid of DOMAIN) and accesses contents. There is one open share that I can access/mount without problem and there's another share with my user name as set-up via the network drive's web-based config. Double-clicked on that, prompted again. user/password doesn't work! It says I have no permissions but the user/pass combination is PERFECT. Some Windows Vista posts talk about a Local Security Policy menu - but that's nowhere to be found. Any ideas? (Windows 7 Professional BTW).

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• I've made something that might be useful to the community. Now what?

  - by Chris McCall

  If the specifics are important, I made a cruisecontrol.net publisher plugin that notifies a series of phone numbers via voice, announcing the current state of the build. It uses Twilio to do so. I'd like to avoid getting hung up on the specifics of what it is I've made, as I have this question a lot, with a number of little hobby one-offs. What's the state of the art as far as making my hobby output available to the world at large? There seem to be a lot of options for open-source project hosting, community features, and what role to take in all of this. It's a little bewildering. What I'm looking for is to put this out into the wild for free and basically take a hands-off approach from there. Is that realistic? Which project hosting service can I use for free to allow developers to at least download the code, report issues and collaborate with each other to improve the product? What snags have you run into that could make me regret this decision? I'm interested in war stories, advice and guidance on making this little product available to the community where it can be used.

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• lambda traits inconsistency across C++0x compilers

  - by Sumant

  I observed some inconsistency between two compilers (g++ 4.5, VS2010 RC) in the way they match lambdas with partial specializations of class templates. I was trying to implement something like boost::function_types for lambdas to extract type traits. Check this for more details. In g++ 4.5, the type of the operator() of a lambda appears to be like that of a free standing function (R (*)(...)) whereas in VS2010 RC, it appears to be like that of a member function (R (C::*)(...)). So the question is are compiler writers free to interpret any way they want? If not, which compiler is correct? See the details below. template <typename T> struct function_traits : function_traits<decltype(&T::operator())> { // This generic template is instantiated on both the compilers as expected. }; template <typename R, typename C> struct function_traits<R (C::*)() const> { // inherits from this one on VS2010 RC typedef R result_type; }; template <typename R> struct function_traits<R (*)()> { // // inherits from this one g++ 4.5 typedef R result_type; }; int main(void) { auto lambda = []{}; function_traits<decltype(lambda)>::result_type *r; // void * } This program compiles on both g++ 4.5 and VS2010 but the function_traits that are instantiated are different as noted in the code.

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• Single developer, project organization

  - by poke

  I am looking for a good (and free) way to organize some of my personal projects. I am saying "organize" because I'm not sure, if the standard project management software solutions are exactly what I am looking for and especially something what I, as a single developer, need. In general, I just want to keep my progress of my projects organized in some way. I would like to be able to keep track of milestones and split those into multiple smaller tasks, so I can keep track of my progress. So some task/issue based system would probably be good, especially as I also want to keep track of issues/bugs with specific versions (although I alone will create those issues). I am and will be the only developer on those projects, so it doesn't matter if the software is offline or online, and I also don't need any collaboration features (like commenting on things, or assigning tasks to other developers etc). But if there is a good software that fits my needs, and in addition it has those things, I don't really care. After all it's easy enough to not use available features. Many online solutions also offer integrated code hosting. I am using git internally, but I don't plan to push any of the code, so such a feature is not needed either. In case of online solutions however I would like the projects to be closed to the public (some of the online utilities only offer open source projects for free and require payments for private projects). I have looked at some project management solutions already, I also read some similar questions here on SO. But given that I'm a single developer, my focus is probably a bit different as when others ask for a huge distributed software that supports many developers and different collaboration features. Some standard answers such as Trac (which also only supports one project), Redmine and FogBUGZ look interesting, but are a bit off my interest (although you may change my mind on that :P). Currently, I'm looking at Indefero which doesn't look too bad. But what do you think?

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• Setting up Kerberos SSO in Windows 2008 network

  - by Arturs Licis

  We recently introduced Kerberos (SPNEGO) Single Sign-on in our web-portal, and tested it on a Windows network with Windows 2003 domain controller. Now, trying to test it on Windows 2008 R2 controlled network, SSO just doesn't work due to defective tokens. Up to the moment I was pretty sure that there's something wrong about environment and that were NTLM tokens. We double checked IE settings etc, but nothing helped. Then we checked the following settings for both users (logged on a client test-machine, and the one used as a Service Principal): This account supports Kerberos AES 128 bit encryption. This account supports Kerberos AES 256 bit encryption. .. and error message changed to ' GSSException: Failure unspecified at GSS-API level (Mechanism level: Encryption type AES256CTS mode with HMAC SHA1-96 is not supported/enabled) It makes me think that Internet Explorer receives Kerberos tokens at all times, and there's just some configuration missing, or it was ktpass.exe to be incorrectly executed. Here's how ktpass.exe was invoked: C:ktpass /out portal1.keytab /mapuser USER /princ HTTP/[email protected] /pass *

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• Hashtable resizing leaks memory

  - by thpetrus

  I wrote a hashtable and it basically consists of these two structures: typedef struct dictEntry { void *key; void *value; struct dictEntry *next; } dictEntry; typedef struct dict { dictEntry **table; unsigned long size; unsigned long items; } dict; dict.table is a multidimensional array, which contains all the stored key/value pair, which again are a linked list. If half of the hashtable is full, I expand it by doubling the size and rehashing it: dict *_dictRehash(dict *d) { int i; dict *_d; dictEntry *dit; _d = dictCreate(d->size * 2); for (i = 0; i < d->size; i++) { for (dit = d->table[i]; dit != NULL; dit = dit->next) { _dictAddRaw(_d, dit); } } /* FIXME memory leak because the old dict can never be freed */ free(d); // seg fault return _d; } The function above uses the pointers from the old hash table and stores it in the newly created one. When freeing the old dict d a Segmentation Fault occurs. How am I able to free the old hashtable struct without having to allocate the memory for the key/value pairs again?

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• System-install-packages missing

  - by Kumar P

  i am using RedHat Enterprise Linux 5.1. When i use add-remove software in application menu, i think, that i wrongly uninstalled something. so after reboot that menu item missing. Also i can't use system-install-packages in terminal. When i double click rpm package it open as archive. And i specifically open it as software installer by open with other application, it saying error /usr/bin/system-install-packages missing. Help me to solve this problem ...

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• Generating the escape sequences for terminal by ahk

  - by obeliksz

  I am trying to make an ahk for putty to send the keycodes that I want for some key combinations in order for my program to work over terminal too. For this I have an ahk already with some key combinations working properly by experimenting awfully much time from here and there, from key tables, etc but I still don't get, did not came up with a clear, logical method to calculate the escape key that I want. An example: ^F1::SendInput ^[O5P It gives 28 in my test prog. I see that for ^[1 I get 377 and for ^[2 376... and I see that there can be used letters out of the hexa numbers (A-F) and also ; and ~ or double [[ Do you understand how this works? Any good descriptive material for this? Thanks a lot!

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• Unable to see hidden files

  - by TheGoodUser-Sp

  I have BitDefender (With last update) on my Windows-7. I want to see hidden files, so from Tools > Folder Options > View , I change the settings as below, and click on OK: But I can't see hidden files. when I double check the Options, I see the settings changed automatically as below : I know this is a virus-like application! checking by a virus total via ProcessExplorer didn't help : How can I understand with process is related to this issue?

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• Gotomeeting MSI needs elevated privs?

  - by DrZaiusApeLord

  Typically I can deploy MSIs with no issue, but the Gotomeeting one refuses to install. SCE lists it as pending and AD just attempts to install it, gives up, and never tries again. When I tried running it by double-clicking its icon, it told me "needs to run with elevated privs." I don't see how I can get AD or SCE to run it with these higher privs. I can run it by using an elevated command prompt and running msiexec from there. The MSI is the one labeled "GoToMeeting MSI Installer (ZIP)" from here: http://support.citrixonline.com/GoToMeeting/search?search=msi Any ideas? I run an environment where the users are non-admins and would love to be able to upgrade this centrally.

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• Identifier is undefined

  - by hawk

  I wrote the following code in C++ using VS2012 Express. void ac_search( uint num_patterns, uint pattern_length, const char *patterns, uint num_records, uint record_length, const char *records, int *matches, Node* trie) { // Irrelevant code omitted. } vector<int> ac_benchmark_search( uint num_patterns, uint pattern_length, const char *patterns, uint num_records, uint record_length, const char *records, double &time) { // Prepare the container for the results vector<int> matches(num_records * num_patterns); Trie T; Node* trie = T.addWord(records, num_records, record_length); // error line ac_search(num_patterns, pattern_length, patterns, num_records, record_length, records, matches.data(), trie); // Irrelevant code omitted. return matches; } I get the error identifier "ac_search" is undefined at the function invoking line. I am a bit confused here. because the function ac_search is declared as a global (not inside any container). Why can't I call it at this place? Am I missing something? Update I tried ignore irrelevant code and then included it gradually and found that everything is fine until I include the outer loop of ac_search I get the aforementioned error. here is updated code of the function ac_search: void ac_cpu_string_search(uint num_patterns, uint pattern_length, const char *patterns, uint num_records, uint record_length, const char *records, int *matches, Node* trie) { // Loop over all records //for (uint record_number = 0; record_number < num_records; ++record_number) //{ // // Loop over all patterns for (uint pattern_number = 0; pattern_number < num_patterns; ++pattern_number) { // Execute string search const char *ptr_record = &records[record_number * record_length]; const char *ptr_match = std::strstr(ptr_record, &patterns[pattern_number * pattern_length]); // If pattern was found, then calculate offset, otherwise result is -1 if (ptr_match) { matches[record_number * num_patterns + pattern_number] = static_cast<int>(std::distance(ptr_record, ptr_match)); } else { matches[record_number * num_patterns + pattern_number] = -1; } // } //} } Update 2 I think the error has something to do with the function addWord which belongs to the class Trie. When I commented out this function, I did not get the error anymore. Node* Trie::addWord(const char *records, uint num_records, uint record_length) { // Loop over all records for (uint record_number = 0; record_number < num_records; ++record_number) { const char *ptr_record = &records[record_number * record_length]; string s = ptr_record; Node* current = root; if ( s.length() == 0 ) { current->setWordMarker(); // an empty word return; } for ( int i = 0; i < s.length(); i++ ) { Node* child = current->findChild(s[i]); if ( child != NULL ) { current = child; } else { Node* tmp = new Node(); tmp->setContent(s[i]); current->appendChild(tmp); current = tmp; } if ( i == s.length() - 1 ) current->setWordMarker(); } return current; } void ac_search( uint num_patterns, uint pattern_length, const char *patterns, uint num_records, uint record_length, const char *records, int *matches, Node* trie) { // Irrelevant code omitted. } vector<int> ac_benchmark_search( uint num_patterns, uint pattern_length, const char *patterns, uint num_records, uint record_length, const char *records, double &time) { // Prepare the container for the results vector<int> matches(num_records * num_patterns); Trie T; Node* trie = T.addWord(records, num_records, record_length); // error line ac_search(num_patterns, pattern_length, patterns, num_records, record_length, records, matches.data(), trie); // Irrelevant code omitted. return matches; }

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• Mac OS X: How to change word separator characters?

  - by avetis.kazarian

  Depending on your system, the word separator characters change the way you can select/delete a word (e.g. by double clicking on it or using a key combination with your keyboard). The fact is that I hate the default behavior of OSX. For example: Take the following line of code: obj.attr1.innerAttr. If my cursor is at the end of the line and I press alt + backspace, it will delete everything and not just innerAttr. I only found some apps (like iTerm) which let you change the word separator characters. Is there a way to change it for the whole system?

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• Installing Office 2010 through group policy without an msi

  - by Ri Caragol

  I have been breaking my head for several days now trying to install Microsoft office 2010 through group policy. Unfortunately Microsoft decided it would be fun to release office without an MSI and so I either Need to create an msi for it or Need to install it through a logon script that would run the setup.exe from a network location. Any advise would be greatlly appreciated. I tried to create a script but even though I double click it and it runs properly, it does not seem to kick in when users log in or when the machine is turned on. Also is there an easy way to create an msi?

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• Very weird C file-handling anomaly

  - by KáGé

  Hello, I got a very weird issue that I cant figure out in my school project, which is the simulation of a simple filesystem in a human-readable textfile. Unfortunately I don't yet have enough time to translate the comments in my code or make it less gibberish, so if you are bothered by that, you don't have to help, I understand. See the code HERE. Now in drive.h, at line 574 is this part: i = getline(); #ifdef DEBUG printf("Free space in all found at %d.\n\n", i); if(drive.disk != NULL){ printf("Disk OK\n\n"); } #endif //write in data state = seekline(i); Before this it finds place for the allocation database entry in the ALL sector (see the "image files" in the mounts folder, this issue was tested on mount_30.efs-dbf), then gets the line with i = getline() fine (getline is in lglobal.h, line 39), but after that any file manipulation (in this case seekline's fseek, but if I comment that out, then the first fprintf after that) crashes the program straight away. I think the file gets somehow corrupted (though the Disk OK message appears) but can't figure out how. I've tried putting i = getline(); into comment, but it didn't make any difference. I've also tried asking at local programming forums but they didn't really help either. The last few lines of the output before it crashes: Dir written. (drive.h line 562) Seekline entered: 268 (called at drive.h line 564) Getline entered. (called at drive.h line 574) Line got: 268. Free space in all found at 268. (drive.h line 576) Seekline entered: 268 (called at drive.h line 582, note that this exact call was run successfully less than 20 lines back. This one should set the pointer to the beginning of the line it is currently in) After this it crashes. Does anyone has any idea of what causes this and how could I fix it? Thank you.

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• Time values not saving in Airport Base Station MAC Timed Access List

  - by Boiler Bill

  I have an airport base station model A1354. I am attempting to setup MAC Timed Access so a laptop can only connect between 5:00AM and 11:00pm through the Airport Utility version 5.5.2 (552.11). My AEBS is running firmware version 7.5.2 When I try to enter the time values by double clicking over the time and entering 05:00 AM and 11:00PM the time values don't stay as soon as it looses focus. Instead they become what is in the following screenshot, and the laptop looses connectivity as soon as I update the base station. I also tried entering the values in military time with the same result. Any base station power users out there that know how I can get the time values to "stick"?

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• How to choose light version of database system

  - by adopilot

  I am starting one POS (Point of sale) project. Targeting system is going to be written in C# .NET 2 WinForms and as main database server We are going to use MS-SQL Server. As we have a lot of POS devices in chain for one store I will love to have backend local data base system on each POS device. Scenario are following: When main server goes down!! POS application should continue working "off-line" with local database, until connection to main server come up again. Now I am in dilemma which local database is going to be most adoptable for me. Here is some notes for helping me point me in right direction: To be Light "My POS devices art usually old and suffering with performances" To be Free "I have a lot of devices and I do not wont additional cost beside main SQL serer" One day Ill love to try all that port on Mono and Linux OS. Here is what I've researched so far: Simple XML "Light but I am afraid of performance, My main table of items is average of 10K records" SQL-Express "I am afraid that my POS devices is poor with hardware for SQLExpress, and also hard to install on each device and configure" Less known Advantage Database Server have free distribution of offline ADT system. DBF with extended Library,"Respect for good old DBFs but that era is behind Me with clipper and DBFs" MS Access Sqlite "Mostly like for now, but I am afraid how it is going to pair with MS SQL do they have same Data types". I know that in this SO is a lot of subjective data, but at least can someone recommended some others lite database system, or things that I shod most take attention before I choice database.

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• Are document-oriented databases any more suitable than relational ones for persisting objects?

  - by Owen Fraser-Green

  In terms of database usage, the last decade was the age of the ORM with hundreds competing to persist our object graphs in plain old-fashioned RMDBS. Now we seem to be witnessing the coming of age of document-oriented databases. These databases are highly optimized for schema-free documents but are also very attractive for their ability to scale out and query a cluster in parallel. Document-oriented databases also hold a couple of advantages over RDBMS's for persisting data models in object-oriented designs. As the tables are schema-free, one can store objects belonging to different classes in an inheritance hierarchy side-by-side. Also, as the domain model changes, so long as the code can cope with getting back objects from an old version of the domain classes, one can avoid having to migrate the whole database at every change. On the other hand, the performance benefits of document-oriented databases mainly appear to come about when storing deeper documents. In object-oriented terms, classes which are composed of other classes, for example, a blog post and its comments. In most of the examples of this I can come up with though, such as the blog one, the gain in read access would appear to be offset by the penalty in having to write the whole blog post "document" every time a new comment is added. It looks to me as though document-oriented databases can bring significant benefits to object-oriented systems if one takes extreme care to organize the objects in deep graphs optimized for the way the data will be read and written but this means knowing the use cases up front. In the real world, we often don't know until we actually have a live implementation we can profile. So is the case of relational vs. document-oriented databases one of swings and roundabouts? I'm interested in people's opinions and advice, in particular if anyone has built any significant applications on a document-oriented database.

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• Will disabling NAT on my wireless router cause a performance hit on my DSL router?

  - by user117313

  I have a Thomson TG508v2 router/modem and a brand new AirPort Extreme connected to it. At first, I set the AirPort Extreme to "share a public IP", which enables DHCP/NAT. Everything works great but I was having the Double NAT error. So I set the AirPort Extreme as bridge mode, which disables DHCP/NAT and let my crappy modem handle my internal network IPs. Will this cause any performance hit in my network? I'm worried because I'll outsource this job from AirPort Extreme (premium hardware) to the crappy modem. Before you suggest, I tried setting my modem as a bridge and configuring PPPoE on the AirPort Extreme, however it wouldn't connect to the internet, so I just dismissed leaving the modem as bridge.

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• Eclipse: open file in external editor only temporarily

  - by user54690

  Using Eclipse, I can open a Java source file with an external editor by right-clicking on the file name (in the Package Explorer) and selecting Open With ... - emacsclient. I'm very glad to be able to do that. However, I only want to do that sometimes, not every time. Now, when I double-click on that same file name, I always automatically get the file opened in emacsclient. This is particularly annoying when I use the Open Type dialog to find a file, because in that case it's not possible to right-click and choose the default Eclipse editor. Is there a way to make Eclipse forget that I previously opened a particular file with emacsclient, so that it can go back to the default behavior of using the regular Eclipse editor?

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