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• Switch from Microsofts STL to STLport

  - by Laserallan

  Hi! I'm using quite much STL in performance critical C++ code under windows. One possible "cheap" way to get some extra performance would be to change to a faster STL library. According to this post STLport is faster and uses less memory, however it's a few years old. Has anyone made this change recently and what were your results?

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• foreach loop a java creation?

  - by abson

  Why was this loop introduced in java?Is it a java creation? What is its purpose(increases memory/cpu utilisation efficiency)?

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• spymemcached (Java Memcached Client)

  - by Java Guy

  Is there a way to collect the memcached stats using this API (spymemcached)? I know there are tools like cacti to collect information on Memcached Server. But I would like to collect, say, memory usage by each item I have put into the server--the total no. of items in the same category, etc... more importantly, the bytes used by individual pieces.

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• Read and write directly from and to compressed files in C

  - by victor

  Hi, in Java I think it is possible to cruise through jar files like they were not compressed. Is there some similar (and portable) thing in C/C++ ? I would like to import binary data into memory from a large (zipped or similar) file without decompressing to disk first and afterwards writing to disk in a compressed way. Maybe some trick with shell pipes and the zip utility?

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• C#: BackgroundWorker cloning resources?

  - by Dav

  The problem I've been struggling with this partiular problem for two days now and just run out of ideas. A little... background: we have a WinForms app that needs to access a database, construct a list of related in-memory objects from that data, and then display on a DataGridView. Important point is that we first populate an app-wide cache (List), and then create a mirror of the cache local to the form on which the DGV lives (using List constructor param). Because fetching the data takes a good few seconds (DB sits on a LAN server) to load, we decided to use a BackgroundWorker, and only refresh the DGV once the data is loaded. However, it seems that doing the loading via a BGW results in some memory leak... or an error on my part. When loaded using a blocking method call, the app consumes about 30MB of RAM; with a BGW this jumps to 80MB! While it may not seem as much anyway, our clients are not too happy about it. Relevant code Form private void MyForm_Load(object sender, EventArgs e) { MyRepository.Instance.FinishedEvent += RefreshCache; } private void RefreshCache(object sender, EventArgs e) { dgvProducts.DataSource = new List<MyDataObj>(MyRepository.Products); } Repository private static List<MyDataObj> Products { get; set; } public event EventHandler ProductsLoaded; public void GetProductsSync() { List<MyDataObj> p; using (MyL2SDb db = new MyL2SDb(MyConfig.ConnectionString)) { p = db.PRODUCTS .Select(p => new MyDataObj {Id = p.ID, Description = p.DESCR}) .ToList(); } Products = p; // tell the form to refresh UI if (ProductsLoaded != null) ProductsLoaded(this, null); } public void GetProductsAsync() { using (BackgroundWorker myWorker = new BackgroundWorker()) { myWorker.DoWork += delegate { List<MyDataObj> p; using (MyL2SDb db = new MyL2SDb(MyConfig.ConnectionString)) { p = db.PRODUCTS .Select(p => new MyDataObj {Id = p.ID, Description = p.DESCR}) .ToList(); } Products = p; }; // tell the form to refresh UI when finished myWorker.RunWorkerCompleted += GetProductsCompleted; myWorker.RunWorkerAsync(); } } private void GetProductsCompleted(object sender, RunWorkerCompletedEventArgs e) { if (ProductsLoaded != null) ProductsLoaded(this, null); } End! GetProductsSync or GetProductsAsync are called on the main thread, not shown above. Could it be that the GarbageCollector just gets lost with two threads? Or is it the task manager that shows incorrect values? Will be greateful for any responses, suggestions, criticism.

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• How to change the coordinate origin in Flash's stage with Actionscript?

  - by Petruza

  I think I did this before but can't find the code. Flash as many other graphical frameworks use the top-left corner as the coordinate origin (0,0) because it's how the underlying memory model is by convention. But it would be really simpler for my calculations if the origin was in the center of the stage, because all the game revolves around the center and uses a lot of trigonometry, angles, etc. Is there some built-in method like Stage::setOrigin( uint, uint ); or something like that?

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• Shut down windows service based on load

  - by JP

  Hello, I was wondering if there are any free / open source solutions that will start and stop a windows service based on load? I have some pubsub subscriber services that do background work which is not critical. Ideally i would like tot be able to automate things so that these services could start if memory/cpu/disk i/o was under a certain threshold and stop gracefully if that threshold was met. Do you know of any solutions? Thanks JP

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• pagesize and its ratio to 4096

  - by osgx

  Hello Are there systems, where minimal page of memory (pagesize) has a size not divisible by 2, or by 1024, 4096? Can it be 3000 or 3500? Will any posix program break, if pagesize will be not divisible by 1024?

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• recommendation for java VM running on embedded system

  - by pierr

  Hi, We are trying to support Java enviroment on our embedded platform (700MHZ MIPS74K, 128-256M memory).After reading this article and googling a bit, I come up with the shorted list: Sun Java SE for embedded Kaffe Jbed Perc HP Chai VM PhoneME I was quite new to Java and its Runtime enviroment. Your suggestion is greatly appreciated.

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• Sysadmin 101: How can I figure out why my server crashes and monitor performance?

  - by bflora

  I have a Drupal-powered site that seems to have neverending performance problems. It was butt-slow about 5 months ago. I brought in some guys who installed nginx for anonymous visitors, ajaxified a few queries so they wouldn't fire during page load, and helped me find a few bottlenecks in the code. For about a month, the site was significantly faster, though not "fast" by any stretch of the word. Meanwhile, I'm now shelling out $400/month to Slicehost to host a site that gets less than 5,000/uniques a day. Yes, you read that right. Go Drupal. Recently the site started crashing again and is slow again. I can't afford to hire people to come in, study my code from top to bottom, and make changes that may or may not help anymore. And I can't afford to throw more hardware at the problem. So I need to figure out what the problem is myself. Questions: When apache crashes, is it possible to find out what caused it to crash? There has to be a way, right? If so, how can I do this? Is there software I can use that will tell me which process caused my server to die? (e.g. "Apache crashed because someone visited page X." or "Apache crashed because you were importing too many RSS items from feed X.") There's got to be a way to learn this, right? What's a good, noob-friendly way to monitor my current apache performance? My developer friends tell me to "just use Top, dude," but Top shows me a bunch of numbers without any context. I have no clue what qualifies as a bad number or a good number in Top, or which processes are relevant and which aren't. Are there any noob-friendly server monitoring tools out there? Ideally, I could have a page that would give me a color-coded indicator about how apache is performing and then show me a list of processes or pages that are sucking right now. This way, I could know when performance is bad and then what's causing it to be so bad. Why does PHP memory matter? My apparently has a 30MB memory foot print. Will it run faster if I bring that number down? Thanks for any advice. I spent a year or so trying to boost my advertising income so I could hire a contractor to solve my performance woes. I didn't want to have to learn all this sysadmin voodoo. I'm now resigned to the fact that might not have a choice.

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• Loading Accessory callout view for mkannotationview

  - by Zap

  I have a map annotation view that contains a rightcallout button which loads an accessory view which is a UIViewController class. I am using resuable annotations, but am wondering how I can pass updated information to my UIViewController class. Let's say I have 2 string values which map to 2 UILabels on my view. How can I update those values after the initial accessory view has already been loaded into memory as a resusable view? Any help would be appreciated.

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• "Access 2002 vs SQL Server 200*" as DB for sharepoint

  - by Jake

  I work with a team that has a sharepoint site currently runnning and its lists are linked to an access DB. My question is really on the investment level, what would be the reasons to upgrade DB to sharepoint if only a few 100 users access this site. Is there a real benefit to replacing the DB with a version of SQL Server, escpecially if about to replace Access 2002 with 2007 some day. I know SQL Server can handle more memory and traffic for more users, but I'm looking for more reasons than that if there are any.

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• In Mac OS X, what's the role of /usr/lib/dyld?

  - by diciu

  How is a binary executed? I'm guessing /usr/lib/dyld loads shared libraries into the binary's memory space and then jumps to whatever the program counter points to under LC_UNIXTHREAD. But who and how executes dyld?

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• Rendering GDI components to a buffer or d3d texture

  - by Tim

  Hi, I'm trying to redirect the output of a GDI application to a buffer, preferably a d3d texture but I'll settle for a system memory buffer that I can then copy to a d3d texture. Specifically, I'm trying to get Google Chrome to render into a d3d buffer to be displayed in a d3d application. Are there any foolproof ways to do this or am I opening the mother of all worm-cans? Thanks, Tim.

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• Subroutine & GoTo design

  - by sub

  I have a strange question concerning subroutines: As I'm creating a minimal language and I don't want to add high-level loops like while or for I was planning on just adding gotos to keep it Turing-Complete. Now I thought, eww - gotos - I wouldn't want to program in that language if I had to use gotos so often. So I thought about adding subroutines instead. I see the difference as the following: gotos Go to (captain obvious) a previously defined point and continue executing the program from there. Leads to hardly understandable and buggy code, I think that's a fact. subroutines Similiar: You define their starting point somewhere, as you call them the program jumps there - but the subroutine can go back to the point it was called from with return. Okay. Why didn't I just add the more function-like, nice looking subroutines? Because: In order to make return work if I call subroutines from within subroutines from within other subroutines, I'd have to use a stack containing the point where the currently running subroutine came from at top. That would then mean that I would, if I create loops using the subroutines, end up with an extremely memory-eating, overflowing stack with return locations. Not good. Don't think of my subroutines as functions. They are just gotos that return to the point they were called from, they don't actually give back values like the return x; statement in nearly all today's languages. Now to my actual questions: How can I solve the above problem with the stack overflow on loops with subroutines? Do I have to add a separate goto language construct without the return option? Assembler doesn't have loops but as I have seen myJumpPoint:, jnz, jz, retn. That means to me that there must also be a stack containing all the return locations. Am I right with that? What about long running loops then? Don't they overflow the stack/eat memory then? Am I getting the retn symbol in assembler totally wrong? If yes, please explain it to me.

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• atomic operation cost

  - by osgx

  Hello What is the cost of the atomic operation? How much cycles does it consume? Will it pause other processors on SMP or NUMA, or will it block memory accesses? Will it flush reorder buffer in out-of-order CPU? What effects will be on the cache? Thanks.

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• How to load a binary file(.bin) of size 6 MB in a varbinary(MAX) column of SQL Server 2005 database

  - by Feroz Khan

  How to load a binary file(.bin) of size 6 MB in a varbinary(MAX) column of SQL Server 2005 database using ADO in vc++ application. This is the code I am using to load the file which I used to load a .bmp file BOOL CSaveView::PutECGInDB(CString strFilePath, FieldPtr pFileData) { //Open File CFile fileImage; CFileStatus fileStatus; fileImage.Open(strFilePath,CFile::modeRead); fileImage.GetStatus(fileStatus); //Alocating memory for data ULONG nBytes = (ULONG)fileStatus.m_size; HGLOBAL hGlobal = GlobalAlloc(GPTR,nBytes); LPVOID lpData = GlobalLock(hGlobal); //Putting data into file fileImage.Read(lpData,nBytes); HRESULT hr; _variant_t varChunk; long lngOffset = 0; UCHAR chData; SAFEARRAY FAR *psa = NULL; SAFEARRAYBOUND rgsabound[1]; try { //Create a safe array to store the BYTES rgsabound[0].lLbound = 0; rgsabound[0].cElements = nBytes; psa = SafeArrayCreate(VT_UI1,1,rgsabound); while(lngOffset<(long)nBytes) { chData = ((UCHAR*)lpData)[lngOffset]; hr = SafeArrayPutElement(psa,&lngOffset,&chData); if(hr != S_OK) { return false; } lngOffset++; } lngOffset = 0; //Assign the safe array to a varient varChunk.vt = VT_ARRAY|VT_UI1; varChunk.parray = psa; hr = pFileData-AppendChunk(varChunk); if(hr != S_OK) { return false; } } catch(_com_error &e) { //get info from _com_error _bstr_t bstrSource(e.Source()); _bstr_t bstrDescription(e.Description()); _bstr_t bstrErrorMessage(e.ErrorMessage()); _bstr_t bstrErrorCode(e.Error()); TRACE("Exception thrown for classes generated by #import"); TRACE("\tCode= %08lx\n",(LPCSTR)bstrErrorCode); TRACE("\tCode Meaning = %s\n",(LPCSTR)bstrErrorMessage); TRACE("\tSource = %s\n",(LPCSTR)bstrSource); TRACE("\tDescription = %s\n",(LPCSTR)bstrDescription); } catch(...) { TRACE("Unhandle Exception"); } //Free Memory GlobalUnlock(lpData); return true; } But when I read the same file using Getchunk funcion it gives me all 0,s but the size of the file I get is same as the one uploaded. Your help will be highly appreciated. Thanks in advance.

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• What are shared by multi threads in the same process?

  - by skydoor

  I found that each thread still has its own registers. Also has its own stack, but other threads can read and write the stack memory. My questions, what are shared by the multi threads in the same process? What I can imagine is 1) address space of the process; 2) stack, register; 3) variables Can any body elaborate it and add more?

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• How to enable attachment using Apache File upload

  - by Stardust

  I am using Apache commons File upload API to Store the file from JSP to servlets in temp directory, but I don't know what should I do next to send the email as an attachment using javamail API. How can I retrieve those files which is written in temp directory using Apache Fileupload API to send them as attachment to mail Server. How will writing those files either to memory or disk will help me?

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• See images in SSMS?

  - by Vaccano

  I was browsing around and found this blog post: http://erikej.blogspot.com/2010/04/version-3-of-exportsqlce-now-available.html (It is for a great add in if you user SQL Server CE.) On that post I saw an screen shot of SSMS with images in the results. How is this done? I have images in my database (PNG files that are serialized via memory stream), but I just see numbers when I select the image column.

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• How do I start WebDevServer from a .sln file without opening Visual Studio 2008

  - by -providerscriptmaster

  Is there a way to start WebDevServer (Visual Web Development Server) by passing in the .sln file without actually opening Visual Studio 2008? I am a JavaScript developer and I work in a client project and I want to save the memory overhead consumed by VS and give it to multiple browsers for cross-browser testing. I am hesitant with setting up IIS (Visual Web Dev server is SO LIGHT-WEIGHT being Cassini). Please advice. Thanks!

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• Reading Resource Files from my own APK in Android Native Environment

  - by Kyle

  I'm porting to Android. My existing project has a ton of resource files that I'm porting into my Android project. I have them all in /res/raw/, and I would like to access those resources in my native library with functions such as fopen() and such. Can this be done, or do I have to go through JNI for this as well? I would really prefer not to, for ease of porting and possible speed and memory reasons.

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• Total stack sizes of threads in one process

  - by David

  I use pthreads_attr_getthreadsizes() to get default stack size of one thread, 8MB on my machine. But when I create 8 threads and allocate a very large stack size to them, say hundreds of MB, the program crash. So, I guess, shall ("Number of threads" x "stack size of per thread") shall less than a value(virtual memory size)?

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• flex 4: does remove element also destorys the element?!

  - by ufk

  Hiya. I dynamically add and remove elements form VGroups. When I create an element and then append it to a VGroup and then remove it from that VGroup, does it destroy the element completely? if not, how can I destroy the element so it won't take space in memory. thanks!

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• valgrind on server process

  - by Pigol

  hi i am new to valgrind. I know how to run valgrind on executable files from command line. But how do you run valgrind on server processes like apache/myqld/traffic server etc .. I want to run valgrind on traffic server (http://incubator.apache.org/projects/trafficserver.html) to detect some memory leaks taking place in the plugin I have written. Any suggestions ? thanks, pigol

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