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Pthread_create Error Cannot Allocate Memory

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you, helping each other. Join them; it only takes a minute: Sign up pthread_create fails w/ ENOMEM? up vote 0 down vote favorite I am seeing pthread_create() fail with rc=12 (ENOMEM), on a 64-bit RHEL machine with 4GB pthread_cancel of real memory. The 'top' command shows the process is using 1G of virtual memory when thread creation fails. I am able to create 16 joinable threads, but the 17th and subsequent calls fail with the ENOMEM error (which apparently means memory -or- some other resource is unavailable). Any thoughts on what's going wrong? c multithreading pthreads share|improve this question asked Aug 27 '10 at 0:38 Lance Purple 263 3 Really hard to say. It pthread_kill should be able to create more threads than that, especially on a 64-bit machine (is your program compiled with 64-bit pointers, though?) where address space fragmentation should be a non-issue. Could you strace -f the program and post an excerpt (a couple dozen lines before and after the system call, whatever it was, that actually returned ENOMEM should suffice), please? –zwol Aug 27 '10 at 0:42 Could be stack size. Are you explicitly setting it when you create the threads? –Dennis Miller Aug 27 '10 at 1:05 No, I am using the default stack size (ulimit -s says 10240k) code pthread_attr_t threadAttr; pthread_t threadID; pthread_attr_init(&threadAttr); pthread_attr_setdetachstate(&threadAttr, PTHREAD_CREATE_JOINABLE); pthread_attr_setscope(&threadAttr, PTHREAD_SCOPE_SYSTEM); int rc = pthread_create(&threadID, &threadAttr, (void*()(void))myTask, myParms); code –Lance Purple Aug 27 '10 at 2:38 pl. add your code & strace as requested by @Zack as an edit in your questions. –Kedar Aug 27 '10 at 4:35 add a comment| 2 Answers 2 active oldest votes up vote 0 down vote I've found this. Seems to be a system limitation, but I'm not completely sure. However, that site provides a workaround. share|improve this answer answered Aug 27 '10 at 11:25 jkramer 9,60143347 add a comment| up vote 0 down vote I ran the program under strace and saw the following: mmap(NULL, 10489856, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS|0x40, -1, 0) = -1 ENOMEM (Canno

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up pthread_create fails with ENOMEM on low http://stackoverflow.com/questions/3580571/pthread-create-fails-w-enomem free memory scenario up vote 3 down vote favorite 2 I have a SH4 board, here are the specs... uname -a Linux LINUX7109 2.6.23.17_stm23_A18B-HMP_7109-STSDK #1 PREEMPT Fri Aug 6 16:08:19 ART 2010 sh4 unknown and suppose I have eaten pretty much all the memory, and have only 9 MB left. free total used free shared buffers cached Mem: 48072 42276 5796 0 172 3264 -/+ buffers/cache: http://stackoverflow.com/questions/7167986/pthread-create-fails-with-enomem-on-low-free-memory-scenario 38840 9232 Swap: 0 0 0 Now, when I try to launch a single thread with default stack size (8 MB) the pthread_create fails with ENOMEM. If I strace my test code, I can see that the function that is failing is mmap: old_mmap(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory) However, when I set the stack size to a lower value using ulimit -s: ulimit -s 7500 I can now launch 10 threads. Each thread does not allocate anything, so it is only consuming the minimum overhead (aprox. 8 kb per thread, right?). So, my question is: Knowing that mmap doesnt actually consume the memory, Why is pthread_create() (or mmap) failing when memory available is below the thread stack size ? c linux pthreads share|improve this question edited Aug 23 '11 at 22:03 asked Aug 23 '11 at 21:47 Ezequiel Garcia 340112 add a comment| 4 Answers 4 active oldest votes up vote 6 down vote The VM setting /proc/sys/vm/overcommit_memory (aka. sysctl vm.overcommit_memory) controls whether Linux is willing to hand out more address space than the combined RAM+swap of the machine. (Of course, if you actually try to access that muc

Get Kubuntu Get Xubuntu Get Lubuntu Get UbuntuStudio Get Mythbuntu Get Edubuntu Get Ubuntu-GNOME Get UbuntuKylin Ubuntu https://ubuntuforums.org/showthread.php?t=2168398 Code of Conduct Ubuntu Wiki Community Wiki Other Support Launchpad http://forums.devshed.com/programming-42/pthread_create-failed-allocate-memory-442638.html Answers Ubuntu IRC Support AskUbuntu Official Documentation User Documentation Social Media Facebook Twitter Useful Links Distrowatch Bugs: Ubuntu PPAs: Ubuntu Web Upd8: Ubuntu OMG! Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community pthread_create error Ubuntu Specialised Support Development & Programming Programming Talk [SOLVED] pthread problem: can't successfully free memory allocated in a thread Having an Issue With Posting ? Do you want to help us debug the posting issues ? < is the place to report it, thanks ! Results 1 to 5 of 5 Thread: pthread problem: pthread_create error cannot can't successfully free memory allocated in a thread Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode August 17th, 2013 #1 mark allyn View Profile View Forum Posts Private Message Frothy Coffee! Join Date Aug 2012 Beans 185 pthread problem: can't successfully free memory allocated in a thread Hello everyone, I am trying to teach myself pthreads and have run into a problem freeing memory allocated in a thread. In the present instance I am passing a struct to the thread create call as the parameter. Here's the code: Code: #include #include #include typedef struct { int dat1; int dat2; } sdata; void * func (void * x); int main ( void ){ pthread_t threadID; sdata d1 sdata *e1; d1.dat1 = 1; d1.dat2 = 2; void * exit_status; pthread_create(&threadID, NULL, func, &d1); pthread_join(threadID, &exit_status); e1=(sdata *)exit_status; printf("Here's the modified struct first field: %d\n", e1->dat1); printf("And he

Search Username Password Remember Me? Register Lost Password? facebook google twitter rss Free Web Developer Tools Advanced Search  Forum Programming Languages C Programming Pthread_create failed : Cannot allocate memory why Thread: Pthread_create failed : Cannot allocate memory why Share This Thread  Tweet This + 1 this Post To Linkedin Subscribe to this Thread  Subscribe to This Thread May 4th, 2007,02:58 PM #1 No Profile Picture bkhote View Profile View Forum Posts  Registered User Devshed Newbie (0 - 499 posts)  Join Date Aug 2005 Posts 16 Rep Power 0 Pthread_create failed : Cannot allocate memory why I am doing a class assignment where a server listen to the socket and creates threads for each connection. This connection is closed on the client side immediatelly after a small interaction with the server and there are never more than 2 threads active at the same time. Do I have to close these connections from server side as well? How? After about 'accepting' about 253/258 connections like this, I get error "pthread_create: Cannot allocate memory" Also, accept returns monotonically increasing sockets for each accept. Thanks BK Faq Reply With Quote May 4th, 2007,03:18 PM #2 dwise1_aol View Profile View Forum Posts  Contributing User Devshed Supreme Being (6500+ posts)                Join Date Jan 2003 Location USA Posts 7,323 Rep Power 2225 How is the client closing the connection? By calling shutdown()? Or by just slamming it shut (very rude behavior)? I discuss the "graceful shutdown" briefly here: http://members.aol.com/DSC30574/sock....html#SHUTDOWN. The key is in understanding what it means when recv() returns zero. If your server threads are left hanging open because they can't handle the clients disconnecting, then you've got lots more than just two threads open. Faq Reply With Quote May 4th, 2007,03:26 PM #3 No Profile Picture bkhote View Profile View Forum Posts  Registered User Devshed Newbie (0 - 499 posts)  Join Date Aug 2

 

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Pthread create Error Codes p here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of million programmers just like you helping each other Join them it only takes a minute Sign up Why does pthread create return up vote down

pthread_create error enomem

Pthread create Error Enomem p here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of million programmers just like you helping each other Join them it only takes a minute Sign up pthread create fails w ENOMEM up vote down