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• Is there a memory efficient and fast way to load big json files in python?

  - by user210481

  I have some json files with 500MB. If I use the "trivial" json.load to load its content all at once, it will consume a lot of memory. Is there a way to read partially the file? If it was a text, line delimited file, I would be able to iterate over the lines. I am looking for analogy to it. Any suggestions? Thanks

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• symlink files newer than X age, then later remove symlink once file ages?

  - by bleomycin

  Hello everyone, i have a large number of files/folders coming in each day that are being sorted automatically to a wide variety of folders. I'm looking for a way to automatically find these files/folders and create symlinks to them all within an "incoming" folder. Searching for file age should be sufficient for finding the files, however searching for age and owner would be ideal. Then once the files/folders being linked to reach a certain age, say 5 days, remove the symlinks to them automatically from the "incoming" folder. Is this possible to do with a simple shell or python script that can be run with cron? Thanks!

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• Software to cd (change directories) into .jar/.ear files?

  - by Segphault

  Is there any software/script that will allow me to cd (change directories) into .jar/.ear/.zip files and edit the contents of the files it contains? I'm working on a large EJB project (yuck), and I frequently find myself in situations like the following: something.ear/ |-- something.jar/ | `-- fileINeedToEdit.xml I work primarily via the command line (Mac/Linux), so I find myself decompressing the files with jar -xvf, editing the file I need to edit, and then recompressing with jar -cvf. Obviously, this becomes a major headache after the first few times. I'd like to be able to treat the compressed files as directories, and simply cd (or some alternate command) to the file I want to edit. Does anyone know how I can accomplish this?

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• What's the memory overhead for a single windows threads?

  - by DayOne

  Is it 1 Mb of stack per thread? Or is that just CLR threads? I want to know the memory over head of native windows threads (c++) and CLR threads as view via Task Manager. Thanks

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• Do null SQLite Data fields take up extra memory?

  - by CSharperWithJava

  I'm using the built in sqlite library on the Android platform. I'm considering adding several general purpose fields that users will be able to use for their own custom applications, but these fields will be blank most of the time. My question is, how much overhead will these blank fields add to my database? Do null fields even take up per record memory in sqlite? If so, how much? I don't quite understand the inner workings of a sqlite database.

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• Joomla modules file structure to store jquery core and some image files.

  - by Joe

  I'm a newbie to joomla. I'm trying to create a joomla module which uses some jquery actions and some image files. Can anyone suggest me a best method to place the jquery-core and jquery plugin files inside the module. I also wants to add some image files with my module.

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• Silverlight, MSBuild, VS and some shared files. How?

  - by asgerhallas

  I have a VS project used for my .NET WCF host with some simple DTOs in it. I then have another project targeted for Silverlight with links to the files from the .NET-project. What's the best way automate the build, so that all files from the .NET project are automatically built to a Silverlight assembly too? I have tried the following in the Silverlight-library project: <Compile Include="..\KSLog.Core.Services.Shared\**\*.cs" Exclude="..\KSLog.Core.Services.Shared\Properties\AssemblyInfo.cs"></Compile> But when I do a build or a rebuild of the solution new files in the .NET project are not automatically added to the Silverlight project, and if I have deleted files in the .NET project, I get a compile error, saying the file is not found in the Silverlight project. Can I make it automatically update it self in some way? Or am I doing it all wrong?

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• C#. Where struct methods code kept in memory?

  - by maxima120

  It is somewhat known where .NET keeps value types in memory (mostly in stack but could be in heap in certain circumstances etc)... My question is - where is the code of the struct? If I have say 16 byte of data fields in the struct and a massive computation method in it - I am presuming that 16 byte will be copied in stack and the method code is stored somewhere else and is shared for all instances of the struct. Are these presumptions correct?

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• What to do if I hate C++ header files?

  - by BlaXpirit

  I was always confused about header files. They are so strange: you include .h file which doesn't include .cpp but .cpp are somehow compiled too. NOTE: I UNDERSTAND EVERYTHING ABOUT THE HEADERS, PLEASE DON'T TELL ME I'M STUPID OR SHOULD USE OTHER LANGUAGE Recently I joined a team project, and of course, both .h and .cpp are used. I understand that this is very important, but I can't live with copy-pasting every function declaration in each of multiple classes we have. How do I handle the 2-file convention efficiently? Are there any tools to help with that, or automatically change one file that looks like example below to .h and .cpp? (specifically for MS VC++ 2010) class A { ... Type f(Type a,Type b) { //implementation here, not in another file! } ... }; Type f(Type a) { //implementation here } ...

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• Which VCS is efficient for storing small changes to big text files?

  - by MiguelM

  A government agency publishes a text file with thousands of records. The entire file is about 60MB. Every day the file has about 60 new or changed records. We need to validate some info against that file, and for auditing purposes, we may need to recover the file as it was in certain date. I thought I could use a VCS to store the file using git, but I understand git stores the entire text file gzipped, so the 60BM file will still need about 30MB to store everyday version. I wonder if one of the free VCS stores only diff/patch files.

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• How to cache *any* object type to memory/disk in java?

  - by Blankman

  Is there a generic way to cache any type of object (be in a java class, or a word document etc.) to memory or disk? Is simply serializing the object, and retaining the file extension (if it has one) enough to rebuild the object?

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• Any way to reserve but not commit memory in linux?

  - by Eloff

  Windows has VirtualAlloc, which allows you to reserve a contiguous region of address space, but not actually use any physical memory. Later when you want to use it (or part of it) you call VirtualAlloc again to commit the region of previously reserved pages. This is actually really useful, but I want to eventually port my application to linux - so I don't want to use it if I can't port it later. Does linux have a way to do this?

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• What are the best tools to help work with large ant files.

  - by klfox

  I just started working at a company that has a very large ant build file that imports lots of other large/small ant files. Needless to say it's giving me a headache trying to figure out what is going on. What are the best tools out there for: Getting some kind of concise answer on what is happening Visualizing the various targets Seeing performance on tasks Can be multiple tools. Any other tips/suggestions? I tagged this as java since I don't have the reputation to create an ant tag.

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• should I put the jar dependancies on the shared repo or just the source files ?

  - by ashy_32bit

  We have a Scala project with few source files (in Scala and Java) and quite some dependencies in various binary formats (jar and DLL). I'm wondering what should go into our shared git repo. Only the source files (developers have to download or somehow resolve the dependencies themselves) or the both the source files and the dependencies? I may add that dependencies are all third parties and available for download for free.

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• How to test obtaining a list of files within a directory using RSpec?

  - by John Topley

  I'm pretty new to the world of RSpec. I'm writing a RubyGem that deals with a list of files within a specified directory and any sub-directories. Specifically, it will use Find.find and append the files to an Array for later output. I'd like to write a spec to test this behaviour but don't really know where to start in terms of faking a directory of files and stubbing Find.find etc. This is what little I have so far: it "should return a list of files within the specified directory" do end Any help much appreciated!

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• Best memory settings for eclipse 4.2 (STS 3.1) on Windows 7 64 bit?

  - by jorrebor

  I apoligize in advance if this question is indeed too subjective as SO warns me. My workstation has 8 gb of ram and runs windows 7 64 bit. I use the Spring tool Suite (3.1) but as soon as i am starting to open and modify the spring config (.xml) files, STS becomes incredibly slow. I already tried switching off "build automatically" and to increase memory settings but no luck. How should i change my .ini ? this is what i have set now: -vm C:/Program Files/Java/jdk1.7.0_07/bin/javaw.exe -startup plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20120522-1813 -product org.springsource.sts.ide --launcher.defaultAction openFile --launcher.XXMaxPermSize 4096M -vmargs -Dosgi.requiredJavaVersion=1.5 -Xms512m -Xmx2048m -XX:MaxPermSize=512m My collageu running the same project in IntelliJ, has no problems. Thank you!

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• Is there an in memory database that supports the DATE function?

  - by Chris J

  Hi, I am doing some unit testing for a DAO that works with postgresql. Some of the SQL queries that my DAO uses involve the DATE function. Is there an in-memory database that supports functions similar to the ones that postgresql does? Currently I am looking for support for the DATE function however, I obviously can see myself using other functions in the future.

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• should I put the jar dependancies on the sahred repo or just the source files ?

  - by ashy_32bit

  We have a Scala project with few source files (in Scala and Java) and quite some dependencies in various binary formats (jar and DLL). I'm wondering what should go into our shared git repo. Only the source files (developers have to download or somehow resolve the dependencies themselves) or the both the source files and the dependencies? I may add that dependencies are all third parties and available for download for free.

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• Why isn't the pathspec magic :(exclude) excluding the files I specify from git log's output?

  - by Jubobs

  This is a follow-up to Ignore files in git log -p and is also related to Making 'git log' ignore changes for certain paths. I'm using Git 1.9.2. I'm trying to use the pathspec magic :(exclude) to specify that some patches should not be shown in the output of git log -p. However, patches that I want to exclude still show up in the output. Here is minimal working example that reproduces the situation: cd ~/Desktop mkdir test_exclude cd test_exclude git init mkdir testdir echo "my first cpp file" >testdir/test1.cpp echo "my first xml file" >testdir/test2.xml git add testdir/ git commit -m "added two test files" Now I want to show all patches in my history expect those corresponding to XML files in the testdir folder. Therefore, following VonC's answer, I run git log --patch -- . ":(exclude)testdir/*.xml" but the patch for my testdir/test2.xml file still shows up in the output: commit 37767da1ad4ad5a5c902dfa0c9b95351e8a3b0d9 Author: xxxxxxxxxxxxxxxxxxxxxxxxx Date: Mon Aug 18 12:23:56 2014 +0100 added two test files diff --git a/testdir/test1.cpp b/testdir/test1.cpp new file mode 100644 index 0000000..3a721aa --- /dev/null +++ b/testdir/test1.cpp @@ -0,0 +1 @@ +my first cpp file diff --git a/testdir/test2.xml b/testdir/test2.xml new file mode 100644 index 0000000..8b7ce86 --- /dev/null +++ b/testdir/test2.xml @@ -0,0 +1 @@ +my first xml file What am I doing wrong? What should I do to tell git log -p not to show the patch associated with all XML files in my testdir folder?

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• How much information do pdb files contain? (C# / .NET)

  - by Silver Dragon

  Is is wise to redistribute the pdb files along with a commercial application? Occasionally, I'm using the stack trace to get a more detailed error reporting logs from the deployed applications; can this functionality be achieved without relying to those files? Also, how much hints of the original source code does these files contain? Would it be easier to reverse-engineer my application using it?

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• Linux How to print all the files with the same prefix after searching for them?

  - by Alyx

  I need to search through a directory which contains many sub directories, each which contain files. The files read as follows question1234_01, where 1234 are random digits and the suffix _01 is the number of messages that contain the prefix, meaning they are apart of the same continuing thread. find . -name 'quest*' | cut -d_ -f1 | awk '{print $1}' | uniq -c | sort -n example output: 1 quest1234 10 quest1523 This searches for all the files then sorts them in order. What I want to do is print all the files which end up having the most occurrences, in my example the one with 10 matches. So it should only output quest1523_01 - 11

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• How can I open several files at once in Vim?

  - by Ethan

  Is there a way to open all the files in a directory from within Vim? So a :command that would say in effect "Open all the files under /some/path into buffers". Ideally, it would be great to open all the files under a dir recursively.

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• How to copy files from folder tree dropping all the folders with Robocopy?

  - by roman m

  I have the following folder structure: FolderA --Folder1 --Folder2 --Folder3 ... --Folder99 Folders 1 through 99 have files in them. All I want to do is to copy ALL THE FILES into ONE FOLDER, basically do a FolderA copy, and wipe out Folders 1-99 keeping all the files. I'd like to do it with Robocopy from cmd.exe if possible (Windows Server 2008)

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• NSDecimalNumber leaks memory if not used with AutoRelease pool?

  - by bioffe

  NSString* str = [[NSString alloc] initWithString:@"0.05"]; NSDecimalNumber* num = [[NSDecimalNumber alloc] initWithString:str]; NSLog(@" %@", num); [str release]; [num release]; leaks memory *** __NSAutoreleaseNoPool(): Object 0x707990 of class NSCFString autoreleased with no pool in place - just leaking Can someone suggest a workaround ?

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• Why use binary files to stack up different versions on DMSs?

  - by edgarator

  I've used both Liferay and Alfresco trying to use them as the Document Management System for an intranet. I noticed the following: They use the file system and the database to store files They use a GUID to name the file on the filesystem and that GUID is used as an Id in the database. The GUID-named file is a binary file The GUID-named binary file stores all versions for a given file The path for the file in the DMS doesn't match the one in the file system The URL makes reference to the GUID when a certain file is requested What I want to know is why is this, and what would be the best way of doing it. Like how to would you create the binary file (zip?), and what parts would you keep in the binary file and what parts would you store in the database (meta-data, path?). I'm assuming some of the benefits of doing it like this. As having the same URL for a file, regardless of its current document path. And having only one file even if the file has changed names over time.

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