Programming :: Why The Thread Stack Size Cannot Be Changed When Calling In A Dynamic Library
Jan 5, 2011
Why the thread stack size can not be changed after calling pthread_attr_setstacksize & pthread_create in a dynamic library? Detail: I write a file thread_factory.c and plan to build it and produce a dynamic library (libthread_factory.so) In the thread_factory.c , there is a routine
[Code]....
And after this, there is application, it will call fct_thread_create(STACK_SIZE_256KB), and then call pthread_attr_getstacksize(), but the stack size return always be a fixed value 0xa01000. (I tried this on Fedora12) But if I build the application source code with the file thread_factory.c directly, the stack size return is right as my expect. I checked the source code of glibc about the routine pthread_create() as below:
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Jan 23, 2011
I seem to only be able to set my stack size on my linux server to 15000. If I increase it to 20000 I get a Segmentation Fault. how I can get the linux OS to increase the stack size? Code: threadRet |= pthread_attr_setstacksize( &m_ThreadAttributes, 15000 );
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Jul 26, 2010
i have an application that launches several pthreads, i know that the default size used by Linux is 8Mb for each pthread. However i would like to optimize the total memory usage by my application by decreasing the default stack size of each pthread to the needed resources. My questions:
- Are there any rules to set the pthread stack size.
- How to compute the memory needed by each thread.
- Is the malloc call inside a thread counted from the stack size of the same pthread?
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Feb 5, 2010
Desperate to reduce RAM usage of my tiny VPS running Ubuntu 9.04 and Apache2.2.11, here I saw that:
On Linux, each child process will use 8MB of memory by default. This is probably unnecessary. You can decrease the overall memory used by Apache by setting ThreadStackSize used by Apache by setting ThreadStackSize to 1MB in.
So I tried to give the suggestion a try. But when I append:
ThreadStackSize 1000000
in my /etc/apache2/httpd.conf <IfModule mpm_prefork_module> directive, and restarted apache, it failed with this message:
Invalid command 'ThreadStackSize', perhaps misspelled or defined by a module not included in the server configuration
So I figured out that the relevant modules are neither enabled nor available on apache2. Now I am wondering whether there is a way to decrease the ThreadStackSize without the need to compile apache from source? If not, what should I do?
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Aug 26, 2010
I am trying to find the dyanmic heap size and stack size of a running process in rhel5.5 and rhel6.I read that the 23rd parameter in the file /proc/pid/stat gives the heap size.Can you elaborate more on this.Also is there any other way to do this?
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Sep 22, 2010
When I set the stack base address of the child thread using the POSIX library function "pthread_attr_setstackaddr()", I am unable to access the memory contents of its parent. The data-structures that are created on the HEAP of its parent using malloc() are either getting destroyed or unaccessible when moving to the context of the child thread. These data-structures are being passed as an argument to the child thread.Even if I make these variables global then also it is not working.pthread_attr_setstacksize(tattr, ...);stackbase = (void *) malloc(...);pthread_attr_setstackaddr(tattr, stackbase);But when I create the child thread without setting its stack base address using that pthread_attr_setstackaddr(), then it is able to access the parent's memory contents.
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May 1, 2011
Why is it in Linux that there is a stack size set by default? And why is it so small? (My system is set to 8192 kbytes.) And why is there a default limit on the stack size when the max memory and virtual memory size are, by default, unlimited? (Aren't they both fed from the same place ultimately?)
Reason I ask: I want to use recursive functions in my programming a lot more. Problem is, if the language (or implementation) doesn't happen to support tail-call recursion, then I can be pretty well certain that the first huge problem that gets thrown at my function is going to kill my program because the stack size limit is going to be quickly reached. Obviously, I can change the stack size limit for my own computers, but it doesn't feel so great knowing that most of the people who copy and execute my code will have probably have overlooked this. Anyway, does anyone know: is this small default stack size limit just one of those historical artifacts, or is there some technical reason for it?
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Nov 18, 2009
How can we convert a dynamic library (filename.so) to a static library (filename.a) using gnu gcc . Can we get a static library form a dynamic library . I saw a few post in which the conversion form a static library to a dynamic library is mentioned but, unfortunately, not the other way.
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Jul 6, 2011
This is my first post. I am unable to call some of the fftw3 library functions in a very simple fortran code. The code is as follows (the filename is trial.f):
Code:
program trial
implicit none
[code]...
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Dec 25, 2010
I am going to use "pthread_setaffinity_np" to bind a thread to a specific core. My application has two threads. I have used mutex to assign a specific id to each thread and then bind that thread to a core different from another core. but it seems that the os assigns both thread to one core.What should I do to bind each thread to a specific core?
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Nov 22, 2010
I have installed oci8 from the remi repo and can not get it to work.I have been trying all day but still end up with the same error in my apache error log when I start httpd.If anyone can suggest something more I can try or where I should look next that would be nice.In the mean time I am going to build a VM and try from a fresh install and see what happens.
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Apr 17, 2011
Can anyone tell me that how to get information about stack, allocated by kernel to a running process? for this ,is there any api function,any system call is available in ubuntu 8.04 ?
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Jul 23, 2011
I keep getting mails with this warning on my 11.04 server
Code: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626/mysql.so' - /usr/lib/php5/20090626/mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0
apparently everything is working as it should and I don't know how to get rid of this warning
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Mar 4, 2011
I recently upgraded to php 5.2 using the testing repository. All went well except for one extension.
root@clibweb2 ~]# php -v
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules//usr/lib64/php/modules/http.so' - /usr/lib64/php/modules//usr/lib64/php/modules/http.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP 5.2.10 (cli) (built: Nov 13 2009 11:44:05)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies
[root@clibweb2 ~]#
I tried:
[root@clibweb2 ~]# ln -s /usr/lib64/php /usr/lib/php
Adding the complete path to php.ini
And using PECL
I still get the error.
Output of
getinfo.sh (general) is at [URL]
The Package specific is at [URL]
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Dec 6, 2010
How do we find the size of a stack when a process is running?
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Dec 30, 2009
I have a new VPS running.But PHP doesn't work well. The error message I get from /var/log/http/error.log is code...
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Nov 8, 2010
After upgrading to FC14, things went south for some of the websites etc I run. I have the following snmp related packages installed:
php-snmp-5.3.3-1.fc14.i686
net-snmp-devel-5.5-21.fc14.i686
net-snmp-libs-5.5-21.fc14.i686
net-snmp-utils-5.5-21.fc14.i686
net-snmp-5.5-21.fc14.i686
On a number of sites I use PHP's snmpget() function, but now on all these I just get this error: PHP Warning: PHP Startup: Unable to load dynamic library '/etc/php.d/snmp.so' - libnetsnmp.so.15: cannot open shared object file: No such file or directory in Unknown on line 0 PHP Fatal error: Call to undefined function snmpget()
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Jan 19, 2010
fedora 12 with php 5.3.1 + apache is installed on the server
I needed a FFMPEG + MENCODER + FFMPEG-PHP setup , so I have installed all of the necessary libraries/codecs along with ffmpeg , mencoder and ffmpeg-php
I've added ffmpeg-php (ffmpeg.so) module to php.ini and restarted httpd
But ffmpeg was not showing up in phpinfo() so I grepped : php -i | grep ffmpeg
for some clues and got this warning
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/ffmpeg.so' - /usr/lib/php/modules/ffmpeg.so: undefined symbol: php_gd_gdImageSetPixel in Unknown on line 0
That error explains why ffmpeg is not loading
Obviously something to do with GD library , so I've researched on the net , and found that some users suggest loading the GD module before FFMPEG module.
I gave it a try and added this at the end of php.ini:
Code: [gd]
;loading gd
extension=gd.so
[ffmpeg]
;loading ffmpeg
extension=ffmpeg.so ...but still same error when greping phpinfo()
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May 29, 2009
I am trying to use a shared bzip2 library in a program I'm writing. For the life of me I can't figure out the correct gcc switch to link it in. I've tried pkg-config, but i don't know the name of the .pc file. Is there any rule for these things?
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Aug 20, 2011
few days ago i installed the newest opensuse 11.4 32bit system and all is working really fine.except when starting apache or doing a php -v on the CLI i receive the following error ->
php -v
PHP Warning: PHP Startup: Unable to load dynamic library
'/usr/lib/php5/extensions/intl.so' - /usr/lib/php5/extensions/intl.so:
undefined symbol: grapheme_extract_count_iter in Unknown on line 0
i know this bug has been reported earlier and i found quite a few results in google.i even found one result where the problem was fixed and updated in an additional opensuse repository -> Additional package repositories - openSUSE the repository with the fix is the following -> Index of /repositories/server:/php/openSUSE_11.4 so ... i added this repository via YAST to the repositories in my system without any problems but whenever i do a system update via YAST i don't receive new fixes and patches from the newly added repository!
if i directly browse to the /i586 folder in the repository i see all the PHP updates with version 5.3.7 and the latest updates were done 19 aug 2011 Index of /repositories/server:/php/openSUSE_11.4/i586 but my system still has PHP version 5.3.5 installed and somehow doesn't want to update from the newly added repository for the apache php modules so ... i just double checked and the repository is enabled in YAST ... but I still don't receive updates from there i would like to update to the new apache php modules, to get rid of that php '/usr/lib/php5/extensions/intl.so' warning, but somehow that doesn't seem to work
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May 14, 2010
i'm getting messages like these in my bash console
Code: STACK size: 98222 [0x7f665dbe4e00 0x7f665db25090] and i'm not quite sure what they mean, so far it looks it's related to the shell stack limit set by ulimit, however i've tried to change it (increasing it) however this message still persists.
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Apr 7, 2009
I'm reading about shared, static, and dynamic libraries. What is SDL? Is it static, shared, or dynamic?
I always thought a library would be a lot of .h and .cpp files compiled separately into .o files and then if you compiled your own program you could use the -l parameter to link the library and it was all compiled together. Now I'm not so sure.
I don't even see any SDL .cpp files in my system anywhere. All I have are lots of SDL .h files in /usr/include/SDL and I don't really understand the code in them.
I'm making a wild guess here: SDL is a shared library. SDL itself is NOT compiled into my program, therefore SDL must be on any system my program tries to run on. When I compile and link SDL all it needs is the header files to know what SDL function and objects it can use. And then on every system it uses an already compiled SDL shared library thingy somewhere.
So... where is that part of SDL? All I can find are header files.
I'm thinking the advantage of shared libraries is that someone could say update SDL on their own system and take advantage of the new features without having to download new executables with the new version of SDL compiled into them for every program that uses SDL.
So if I'm making an editor and a game engine and they both use a lot of the same .cpp and .h files that I wrote and I'm tired of updating one and then the other and I need to turn them into a library, then a shared library might be kind of a silly solution. I could just make a static library. Right? Because it's not SDL. Nobody else is ever going to use this library.
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Oct 22, 2010
After upgrading my server from 10.04 to 10.10 I keep getting the following php error, "PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626+lfs/syck.so' - /usr/lib/php5/20090626+lfs/syck.so: cannot open shared object file: No such file or directory in Unknown on line 0"
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Sep 28, 2010
A simple TCP based chat server could allow users to use any TCP client (telnet, for example) to communicate with each other. For this question you should consider a single process, single thread server that can support exactly 2 clients at once, the server simply forwards whatever is sent from one client to the other (in both directions). Your server must not insist on any specific ordering of messages as soon as something is sent from one client it is immediately forwarded to the other client. As soon as either client terminates the connection the server can exit
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Sep 6, 2010
I need to call some other functions in "int init_module(void)" and module. So I need a stack. How can I setup a stack (1kB) for my module in C?
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Mar 1, 2011
If I issue the following and the process doesn't quit, is there a way to view what it's doing with the SIGTERM signal on the stack? Is this done via the pstack command?kill -s SIGTERM <PID>
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Nov 4, 2010
i have just modify tcp.c file in/usr/src/linux/net/ ipv4 location.Now should i compile the complete kernel?if not then how to compile that net/ipv4 package or etc.
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May 19, 2010
Whenerver I try to log on to our Windows 2008 R2 server via rdesktop, the window stays at the same small size. I can neither enlarge the window at the borders nor maximize it. Alt+Ctrl+Enter simply gives me the same window-content on the full screen with the rest simply grey.
Is that normal behaviour for rdesktop? Is there an alternative?
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Apr 10, 2010
What is the realmode interrupt return on the stack. Is it pop AX pop CS or vice versa?
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May 18, 2011
We have a 32bit Gui application created using C++. We ported the application from Solaris to Linux. Issue we are facing is the size of the library and executable is very large in LINUX compared to Solaris. Red Hat Enterprise Linux 5.4 is the Linux version we using. Please find a sample dynamic library created. We would like to know the following behavior of LINUX is normal or not. Consider we created two files test1.cc and test2.cc. Both having a single line of code.
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