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• Using memory mapping in C for reading binary

  - by user1320912

  I am trying to read data from a binary file and process it.It is a very large file so I thought I would use memory mapping. I am trying to use memory mapping so I can read the file byte by byte. I am getting a few compiler errors while doing this. I am doing this on a linux platform #include <unistd.h> #include <sys/types.h> #include <sys/mman.h> int fd; char *data; fd = open("data.bin", O_RDONLY); pagesize = 4000; data = mmap((caddr_t)0, pagesize, PROT_READ, MAP_SHARED, fd, pagesize); The errors i get are : caddr not initialized, R_RDONLY not initialized, mmap has too few arguments. Could someone help me out ?

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• Silverlight 4.0 Memory Stream to XPS

  - by xscape

  Is there a way to convert memory stream to .xps?

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• Memory allocation for const in C#

  - by n0vic3c0d3r

  How is memory allocated when I use: public class MyClass { public const string myEVENT = "Event"; //Other code }

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• Memory leak in chrome.extension.sendRequest()

  - by jprim

  Chrome Version : 9.0.597.19 (Build 68937) beta & current stable I have simplified my code as far as possible. I ended up with the attached extension: content.js (content script run on every site): setInterval(function() { chrome.extension.sendRequest({ }, function(response) { //Do nothing }); }, 1); background.js (background page script): chrome.extension.onRequest.addListener(function(request, sender, sendResponse) { sendResponse({ }); }); When you install this extension, you can observe it eating up memory extremely fast (I got 90MB in 1 min with 9 tabs opened). You can speed up the process by opening more tabs. Of course, the extension I am actually developing does not send requests every millisecond, but only every 3 seconds. This just slows it down, though. A user who has run it in the background for a long time with many tabs opened has reported 100MB of memory usage, and I can reproduce it to a less extreme extent, too.

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• How to safely operate on parameters in threads, using C++ & Pthreads?

  - by ChrisCphDK

  Hi. I'm having some trouble with a program using pthreads, where occassional crashes occur, that could be related to how the threads operate on data So I have some basic questions about how to program using threads, and memory layout: Assume that a public class function performs some operations on some strings, and returns the result as a string. The prototype of the function could be like this: std::string SomeClass::somefunc(const std::string &strOne, const std::string &strTwo) { //Error checking of strings have been omitted std::string result = strOne.substr(0,5) + strTwo.substr(0,5); return result; } Is it correct to assume that strings, being dynamic, are stored on the heap, but that a reference to the string is allocated on the stack at runtime? Stack: [Some mem addr] pointer address to where the string is on the heap Heap: [Some mem addr] memory allocated for the initial string which may grow or shrink To make the function thread safe, the function is extended with the following mutex (which is declared as private in the "SomeClass") locking: std::string SomeClass::somefunc(const std::string &strOne, const std::string &strTwo) { pthread_mutex_lock(&someclasslock); //Error checking of strings have been omitted std::string result = strOne.substr(0,5) + strTwo.substr(0,5); pthread_mutex_unlock(&someclasslock); return result; } Is this a safe way of locking down the operations being done on the strings (all three), or could a thread be stopped by the scheduler in the following cases, which I'd assume would mess up the intended logic: a. Right after the function is called, and the parameters: strOne & strTwo have been set in the two reference pointers that the function has on the stack, the scheduler takes away processing time for the thread and lets a new thread in, which overwrites the reference pointers to the function, which then again gets stopped by the scheduler, letting the first thread back in? b. Can the same occur with the "result" string: the first string builds the result, unlocks the mutex, but before returning the scheduler lets in another thread which performs all of it's work, overwriting the result etc. Or are the reference parameters / result string being pushed onto the stack while another thread is doing performing it's task? Is the safe / correct way of doing this in threads, and "returning" a result, to pass a reference to a string that will be filled with the result instead: void SomeClass::somefunc(const std::string &strOne, const std::string &strTwo, std::string result) { pthread_mutex_lock(&someclasslock); //Error checking of strings have been omitted result = strOne.substr(0,5) + strTwo.substr(0,5); pthread_mutex_unlock(&someclasslock); } The intended logic is that several objects of the "SomeClass" class creates new threads and passes objects of themselves as parameters, and then calls the function: "someFunc": int SomeClass::startNewThread() { pthread_attr_t attr; pthread_t pThreadID; if(pthread_attr_init(&attr) != 0) return -1; if(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) return -2; if(pthread_create(&pThreadID, &attr, proxyThreadFunc, this) != 0) return -3; if(pthread_attr_destroy(&attr) != 0) return -4; return 0; } void* proxyThreadFunc(void* someClassObjPtr) { return static_cast<SomeClass*> (someClassObjPtr)->somefunc("long string","long string"); } Sorry for the long description. But I hope the questions and intended purpose is clear, if not let me know and I'll elaborate. Best regards. Chris

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• memcpy() safety on adjacent memory regions

  - by JaredC

  I recently asked a question on using volatile and was directed to read some very informative articles from Intel and others discussing memory barriers and their uses. After reading these articles I have become quite paranoid though. I have a 64-bit machine. Is it safe to memcpy into adjacent, non-overlapping regions of memory from multiple threads? For example, say I have a buffer: char buff[10]; Is it always safe for one thread to memcpy into the first 5 bytes while a second thread copies into the last 5 bytes? My gut reaction (and some simple tests) indicate that this is completely safe, but I have been unable to find documentation anywhere that can completely convince me.

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• Mathematica & J/Link: Memory Constraints?

  - by D-Bug

  I am doing a computing-intensive benchmark using Mathematica and its J/Link Java interface. The benchmark grinds to a halt if a memory footprint of about 320 MB is reached, since this seems to be the limit and the garbage collector needs more and more time and will eventually fail. The Mathematica function ReinstallJava takes the argument command line. I tried to do ReinstallJava[CommandLine -> "java -Xmx2000m ..."] but Mathematica seems to ignore the -Xmx option completely. How can I set the -Xmx memory option for my java program? Where does the limit of 320 MB come from? Any help would be greatly appreciated.

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• zeroing out memory

  - by robUK

  Hello, gcc 4.4.4 c89 I am just wondering what most c programmers do when they want to zero out memory. For example I have a buffer of 1024 bytes. Sometimes I do this: char buffer[1024] = {0}; Which will zero all bytes. However, should I declare like this and use memset? char buffer[1024]; . . memset(buffer, 0, sizeof(buffer); Is there any real reason you have to zero the memory? What is the worst that can happen by not doing it? Many thanks for any suggestions,

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• malloc unable to assign memory + doesnt warn

  - by sraddhaj

  char *str=NULL; strsave(s,str,n+1); printf("%s",str-n); when I gdb debug this code I find that the str value is 0x0 which is null and also that my code is not catching this failed memory allocation , it doesnt execute str==NULL perror code ...Any idea void strsave(char *s,char *str,int n) { str=(char *)malloc(sizeof(char)* n); if(str==NULL) perror("failed to allocate memory"); while(*s) { *str++=*s++; } *str='\0'; }

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• Memory allocation in Java [closed]

  - by hari

  Explain the memory allocation in Java for a written program.

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• In-memory data structure that supports boolean querying

  - by sanity

  I need to store data in memory where I map one or more key strings to an object, as follows: "green", "blue" -> object1 "red", "yellow" -> object2 I need to be able to efficiently receive a list of objects, where the strings match some boolean criteria, such as: ("red" OR "green") AND NOT "blue" I'm working in Java, so the ideal solution would be an off-the-shelf Java library. I am, however, willing to implement something from scratch if necessary. Anyone have any ideas? I'd rather avoid the overhead of an in-memory database if possible, I'm hoping for something comparable in speed to a HashMap (or at least the same order of magnitude).

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• memory access violation error - 0xC0000005

  - by nobody

  I got memory access violation error sometimes.... but I don't know where the error comes from... So I reviewed the code and I found some strange code... delete m_p1; A *a = new A(); a->b = *c; m_p1 = a; --> strange code. I think it's a little strange line.... can i use the m_p1 after delete the m_p1? It can make some memory access error??

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• About memory and delete object in c++

  - by barssala

  I will give some examples and explain. First, I declare some object like CString* param = new CString[100] And when I declare this one, my memory would increase a little bit because it's some implemented string. Then I store this object in some list of CString just like List<CString> myList = new List<CString>; // new list of CString myList.add(param); This is my question: I wanna know, when I delete myList, my param isn't deleted, right? And memory in param still exists. Do I misunderstand?

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• memory leak in Zend_Db_Table_Row?

  - by Vincenzo

  This is the code I have: <?php $start = memory_get_usage(); $table = new Zend_Db_Table('user'); for ($i = 0; $i < 5; $i++) { $row = $table->createRow(); $row->name = 'Test ' . $i; $row->save(); unset($row); echo (memory_get_usage() - $start) . "\n"; } This is what I see: 90664 93384 96056 98728 101400 Isn't it a memory leak? When I have 500 objects to insert into DB in one script I'm getting memory overflow. Can anyone help?

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• dynamic memory allocation [closed]

  - by gcc

  i wanna write a program that creates (allocating memory) and manipulates (adding elements and increasing memory etc.) integer arrays dynamically according to given input sequences. input sequence which starts with the maximum number of arrays, includes integers to be put into arrays and some one letter characters which are commands to carry out some tasks (activating next array, deleting an array etc). also, i wanna create *c_arrays which is the address of the array whose elements are the actual capacities (How many integer slots are already allocated for an array?) of arrays how should i organize(set up) the algorithm?

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• removing image tag from memory

  - by Chapsterj

  I have seen some code to check if a background image on a div is loaded. What they are doing is adding a img tag to memory but storing it in a variable and using that to see if the image is loaded with the load event. My question is does the $img tag stay in memory and how would I be able to remove that tag when the load event has been called. var $div = $('div'), bg = $div.css('background-image'); if (bg) { var src = bg.replace(/(^url\()|(\)$|[\"\'])/g, ''), $img = $('<img>').attr('src', src).on('load', function() { // do something, maybe: $div.fadeIn(); }); } }); I got this code above from this post

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• memory management question -- releasing an object which has to be returned

  - by ulag

  Hi, I have an NSMutableArray called playlist. This is in a method called getAllPlaylists. The code is something like this: -(NSMutableArray *)getAllPlaylists { //playlist is an instance variable playlist = [[NSMutableArray alloc] init]; //memory leak here . . //some code here which populates the playlist array [playlist addObject: object1]; . . return playlist; } The array allocation step of playlist is causing a memory leak. In such a scenario where can i release this array? Or can i avoid allocation n initialization of playlist here by doing something else?

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• Win 7 running slowly with low CPU usage and memory

  - by guywhoneedsahand

  I have a relatively new (under 2 yrs old) windows 7 machine. It has 9GB of RAM, and an i7 core CPU (930 @ 2.8GHz w/ 8 CPUs). After about 8 months since a clean install, I noticed my computer was running slowly. I figure it was fragmentation etc, and I did a complete wipe & clean reinstall. However, my problems are somehow persisting. The computer is running painfully slowly (but in leaps and bounds - sometimes it will work fine for 3 hrs, then suddenly freeze up just from clicking the start button). The 'freezes' happen randomly - not during any especially intensive computing. I initially thought something might be eating through my CPU and/or Memory, but Task Manager indicates that neither the CPU or Memory spike. In fact, even during serious lag, CPU usage remains at less than 5% and Memory at ~ 1.5GB. It's beyond me why a fresh install on a powerful machine is performing so poorly... and it certainly is frustrating! What could be causing the poor performance, and what can I do to fix it?

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• Windows Terminal Server: occasional memory violation for applications

  - by syneticon-dj

  On a virtualized (ESXi 4.1) Windows Server 2008 SP2 32-bit machine which is used as a terminal server, I occasionally (approximately 1-3 event log entries a day) see applications fail with an 0xc0000005 error - apparently a memory access violation. The problem seems quite random and only badly reproducable - applications may run for hours, fail with 0xc0000005 and restart quite fine or just throw the access violation at startup and start flawlessly at the second attempt. The names of executables, modules and offset addresses vary, although a single executable tends to fail with same modules and the same memory offset addresses (like "OUTLOOK.EXE" repeatedly failing on module "olmapi32.dll" with the offset "0x00044b7a") - even across multiple user's logons and with several days passing without a single failure inbetween. The offset addresses seem to change across reboots, however. Only selective executables seem affected by the problem, although I may simply not be seeing a sufficient number of application runs from the other ones. I first suspected a possible problem with the physical machine's RAM, but ruled this out as a rather unlikely cause - the memory comes with ECC and I've already moved the virtual machine across several times, without any perceptable change. I've seen that DEP was enabled in "OptOut" mode on this machine: C:\Users\administrator>wmic OS Get DataExecutionPrevention_SupportPolicy DataExecutionPrevention_SupportPolicy 3 and tried changing the policy to OptIn via startup options: bcdedit.exe /set {current} nx OptIn but have yet to see any effect - I also would expect Outlook 12 or Adobe Reader 9 (both affected applications) to play well with DEP. Any other ideas why the apps may be failing?

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• Can’t connect to SQL Server 2008 - looks like Shared Memory problem

  - by user38556

  I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest). I have tried restarting the SQL Server service, by the way, and also tried to get someone to log onto the machine with an admin account to restart the SQL Server service. Still no luck.

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• Apache process consuming all memory on the server

  - by jemmille

  I have an apache process that suddenly appears on a particular server. When it shows up it starts consuming memory at a very rapid rate, then moves on to all the swap. In all it consumes about 11GB (including swap) of memory and the server eventually becomes unresponsive. The load on the server is under 1 at all other times. The process runs as nobody and I am having a hard time tracking down the source. If i run an strace on the process and all it did was continuously dump out mprotect over and over again If i run lsof -p <pid>, I get this, but only sometimes: httpd 19229 nobody 152u IPv4 175050 crawl-66-249-67-216.googlebot.com:62336 (CLOSE_WAIT) httpd 19229 nobody 153u IPv4 179104 crawl-66-249-71-167.googlebot.com:58012 (ESTABLISHED) As long as I catch it, I can kill the process and the server almost immediately stabilizes. I have on site on the server that is getting a few thousand hits a a day that I think might be the source, but I still can't find the exact reason. Also, this is a cPanel server and I have upcp'd the server, rebuilt apache with easy apache, and rebuilt httpd.conf. It is not spawing any related processes, meaning I can find any php, mysql, cgi, etc. processes that relate to this process. It's just a loner process that balloons fast and consumes ever last MB of memory. This is on a XenServer 5.6 based VM. No other servers in the cluster are having this issue.

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• Massive Memory Leaks?

  - by Mads

  Hi, I seem to have huge memory leaks, which are confusing me. I'm running fusion 3.1 / Windows 7 on Snow Leopard. It's a clean install with all upgrades applied. I've given fusion 8GB on a 14GB machine. I've installed VS2008 & Eclipse in Windows 7. Nothing unusual. Inside Task Manager in Windows 7, my memory footprint stays reasonable, at <2GB. But in OSX, Activity Monitor shows the footprint of vmware-vmx to be much larger. It starts at 2 GB, which seems fine, but whenever I'm actually doing anything in Windows, vmware-vmx's footprint grows at a few MB per second. After 20 mins or so it's using ~10GB and everything grinds to a halt. Throughout this, Task Manager still says I'm only using 2GB. And whatever I do in windows seems to increase vmware-vmx's memory footprint. Even closing down an application seems to make it go up. So is this par for the course in fusion? I was previously using parallels 3 / Vista under Leopard, and it worked fine. I'd assumed my new fusion config would work better, but this makes it completely unusable. (And apparently I can't even ask tech support unless I buy a support package...) Any advice much appreciated. Thanks

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• How to Set up MySQL Server to utilize more memory

  - by Cyril Gupta

  Hi there, I have MySQL setup on Windows along with Plesk. The version is 5.0.45 Community. The databases I have on the server are MyISAM as well as InnoDb, but predominantly innodb. I had 8G memory on my server, but MySQL isn't going up more than 1.3G and tweaking the settings isn't helping. I tried to increase the memory allocation for innodb_buffer_pool_size, it works if I set it up to 1G, but if I set 2G, or above the server doesn't come back online! I want mySQL to use at least 5-6 Gigs of the memory I have for performance, but I can't get this to work. Can anyone please help? My mysql config file is below (there are 2 mysqld sections... when i used MySQL workbench it created another one!) [MySQLD] port=3306 basedir=C:\\Program Files (x86)\\Parallels\\Plesk\\Databases\\MySQL datadir=C:\\Program Files (x86)\\Parallels\\Plesk\\Databases\\MySQL\\Data default-character-set=latin1 default-storage-engine=INNODB query_cache_size=128M table_cache=1024 tmp_table_size=32M thread_cache=32 myisam_max_sort_file_size=100G myisam_max_extra_sort_file_size=100G myisam_sort_buffer_size=2M key_buffer_size=32M read_buffer_size=16M read_rnd_buffer_size=2M sort_buffer_size=8M innodb_additional_mem_pool_size=24M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=10M innodb_buffer_pool_size=1G innodb_log_file_size=10M innodb_thread_concurrency=8 max_connections=700 key_buffer=48M max_allowed_packet=5M sort_buffer=2M net_buffer_length=4K old_passwords=1 wait_timeout=20 connect_timeout=60 [client] port=3306 [mysqld] query_cache_min_res_unit = 4096 innodb_additional_mem_pool_size = 1048576 innodb_buffer_pool_size = 1G query_cache_limit = 1048576 key_buffer_size = 8388608 sort_buffer_size = 2097144 query_cache_type = 1 query_cache_size = 312M log-slow-queries connect_timeout = 5 wait_timeout = 20 thread_cache_size = 15 read_buffer_size = 131072 table_cache = 64

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• Glassfish v3 failure when startup. "Cannot allocate memory "

  - by Shisoft

  It is clear in this Question Fail to start Glassfish 3.1: java.io.IOException: error=12, Cannot allocate memory But in my case,I have a 512M memory Ubuntu 10.04 vps.It seems that I don't need to change any configure.But when start the server,I got this exception VM failed to start: java.io.IOException: Cannot run program "/usr/lib/jvm/java-6-sun-1.6.0.22/bin/java" (in directory "/home/glassfish/glassfish/domains/domain1/config"): java.io.IOException: error=12, Cannot allocate memory So,I set <jvm-options>-Xmx512</jvm-options> to <jvm-options>-Xmx400</jvm-options> The exception remains.What did I do something wrong? result of free -m total used free shared buffers cached Mem: 512 43 468 0 0 0 -/+ buffers/cache: 43 468 Swap: 0 0 0 result of cat /proc/user_beancounters Version: 2.5 uid resource held maxheld barrier limit failcnt 146049: kmemsize 2670652 5385253 51200000 51200000 0 lockedpages 0 8 2048 2048 0 privvmpages 11134 134522 131200 262200 4 shmpages 648 1352 128000 128000 0 dummy 0 0 0 0 0 numproc 12 73 500 500 0 physpages 6519 28162 0 200000000 0 vmguarpages 0 0 512000 512000 0 oomguarpages 6527 28169 512000 512000 0 numtcpsock 4 14 4096 4096 0 numflock 0 5 2048 2048 0 numpty 1 2 32 32 0 numsiginfo 0 3 1024 1024 0 tcpsndbuf 159600 265744 20480000 20480000 0 tcprcvbuf 65536 3590352 20480000 20480000 0 othersockbuf 44232 90640 20480000 20480000 0 dgramrcvbuf 0 12848 10240000 10240000 0 numothersock 22 31 2048 2048 0 dcachesize 0 0 10240000 10240000 0 numfile 1002 1474 50000 50000 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 numiptent 24 24 2048 2048 0 Thanks

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• Apache memory allocation error message

  - by la_f0ka

  I'm trying to set up a medium sized Drupal 7 website on my miniserver but I keep getting a 500 error message. This is what I found in Apache's error log: [Wed Sep 12 15:02:04 2012] [notice] SSL FIPS mode disabled [Wed Sep 12 15:02:04 2012] [warn] No JkShmFile defined in httpd.conf. Using default /usr/local/apache/logs/jk-runtime-status [Wed Sep 12 15:02:04 2012] [notice] Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/1.0.0-fips mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_jk/1.2.35 configured -- resuming normal operations [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] /usr/bin/php: error while loading shared libraries: libkrb5support.so.0: failed to map segment from shared object: Cannot allocate memory [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] Premature end of script headers: index.php [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] /usr/bin/php: error while loading shared libraries: libkrb5support.so.0: failed to map segment from shared object: Cannot allocate memory [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] Premature end of script headers: index.php [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] File does not exist: /home/brighton/public_html/favicon.ico [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] /usr/bin/php: error while loading shared libraries: libkrb5support.so.0: failed to map segment from shared object: Cannot allocate memory [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] Premature end of script headers: index.php I contacted support and they just told me I should just upgrade my package (right not I have a 512Mb account), but I am not sure if I'm buying it... even if I'm trying to access a file which only contains phpinfo(); I still get the 500. Any help would be much appreciated, and if there's need of any other information please let me know and I'll update the question. I compiled apache with tomcat because I intend to use Solr... not sure if this is relevant or not.

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