openSUSE Programming December 2004

programming@lists.opensuse.org

22 participants
17 discussions

Re: [suse-programming-e] openlook/xview problems in 9.2
by Mark Gray 31 Dec '04

31 Dec '04

Wybo Dekker <wybo(a)servalys.nl> writes: > Hi, > > I have installed all of openlook (xview) > But any precompiled binaries (such as /usr/openwin/bin/cmdtool) > as well as my own developments using xview, when are executed say: > > bin>cmdtool > XView warning: Cannot load font '-b&h-lucida-medium-r-*-*-*-120-*-*-*-*-*-*' (Font package) > XView warning: Cannot load font '-b&h-lucida-medium-r-normal-sans-*-120-*-*-*-*-*-*' (Font package) > XView error: Cannot open connection to window server: :0.0 (Server package) > > which is fatal. > I had no problems with SuSE-9.0 You probably need to install the correct font package: xorg-x11-fonts-75dpi-6.8.1-15 contained in either: suse/i586/xorg-x11-fonts-75dpi-6.8.1-15.i586.rpm suse/x86_64/xorg-x11-fonts-75dpi-6.8.1-15.x86_64.rpm (I say probably, because that might not be all that is wrong, but it is a start :-)

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openlook/xview problems in 9.2
by Wybo Dekker 31 Dec '04

31 Dec '04

Hi, I have installed all of openlook (xview) But any precompiled binaries (such as /usr/openwin/bin/cmdtool) as well as my own developments using xview, when are executed say: bin>cmdtool XView warning: Cannot load font '-b&h-lucida-medium-r-*-*-*-120-*-*-*-*-*-*' (Font package) XView warning: Cannot load font '-b&h-lucida-medium-r-normal-sans-*-120-*-*-*-*-*-*' (Font package) XView error: Cannot open connection to window server: :0.0 (Server package) which is fatal. I had no problems with SuSE-9.0 -- Wybo

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Re: [suse-programming-e] STL memory pools
by Mark Gray 24 Dec '04

24 Dec '04

Davi de Castro Reis <davicastro(a)terra.com.br> writes: > Hi guys, > > Does anyone know how to release all the memory allocated by STL? > Just let me say why I want to do this. The software I am working on uses > STL a lot in its first phase. I allocate nearly a 1GB of memory in a lot > of different STL containers. What kind of containers and how big are the objects in them? > In the second phase of the software, I clear() all these container and > start a custom algorithm that also uses a lot of memory. But the STL > memory pool is holding quite a lot of memory, and I run out of memory in > the middle of the algorithm. What kind of memory allocation do you use in the second phase? > If I run the two phases of the software in different binaries, > everything is ok and my algorithm fits in memory. There are no leaks > that I am aware of in the software (I've already made a lot of valgrind > checks). > I do not want to use -D__USE_MALLOC or GLIBCPP_FORCE_NEW=1, since I do > want the performance of the STL memory pool. I just want to release this > pool during one of the phases of my software. The pool is only used for nodes smaller than 128 bytes, and as you have noticed there is no public/documented/legal way to release memory from the pool. Therefore if you, for example, are using a list, map, or set with small nodes your only choice is to write your own custom allocator. Copying the pool allocator template from: /usr/include/g++/bits/stl_alloc.h and adding a member function to deallocate the pool to your version might be an acceptable solution. Before you get that far, are you sure that your memory is coming from the pool? If you are using vectors for instance, you probably are allocating much larger blocks and totally bypassing the pool. If so, then you might want to know about the "swap trick" (Item 17 in Scott Meyers' "Effective STL"): vector<Stuff> big_vector; ... ... // use big_vector ... vector<Stuff>().swap(big_vector); // clear big_vector and // minimize its capacity because clear() does not decrease the capacity of a vector or deallocate any memory. Since you are apparently already deep enough into your problem to have found the "pool" I really hesitate to suggest this, but I just finished reading "Effective STL" so I couldn't keep my mouth shut :-)

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STL memory pools
by Davi de Castro Reis 24 Dec '04

24 Dec '04

Hi guys, Does anyone know how to release all the memory allocated by STL? Just let me say why I want to do this. The software I am working on uses STL a lot in its first phase. I allocate nearly a 1GB of memory in a lot of different STL containers. In the second phase of the software, I clear() all these container and start a custom algorithm that also uses a lot of memory. But the STL memory pool is holding quite a lot of memory, and I run out of memory in the middle of the algorithm. If I run the two phases of the software in different binaries, everything is ok and my algorithm fits in memory. There are no leaks that I am aware of in the software (I've already made a lot of valgrind checks). I do not want to use -D__USE_MALLOC or GLIBCPP_FORCE_NEW=1, since I do want the performance of the STL memory pool. I just want to release this pool during one of the phases of my software. Thanks in advance, Davi de Castro Reis

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pthread differences
by Simon Nattrass 23 Dec '04

23 Dec '04

On SLES 64 there are two versions of the library libpthread.a - /usr/lib64/libpthread.a & /usr/lib64/nptl/libpthread.a. What's the difference? I'm guessing the later maybe implements the Native POSIX Thread Library while the former uses what? ? (LinuxThreads?, Next Generation POSIX Threads?). Rgds, Simon

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Re: [suse-programming-e] Directory Handling -- New to C++
by Mark Gray 22 Dec '04

22 Dec '04

<linuxdev(a)sptc.net> writes: > Hello, > I am trying to write a program in C++ and I need to check to see if a > directory exists, if not create it, move a file and verify that all works > well. How do I go about this in Linux? To check if a directory exists: extern "C" { #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> } #include <iostream> using namespace std; struct stat dir_stat; int main(int argc, char* argv[]) { stat(argv[1], &dir_stat); if (S_ISDIR(dir_stat.st_mode)) { cout << argv[1] << " is a directory" << endl; } else { cout << argv[1] << " is a NOT directory" << endl; } } markgray@soyo:/ARK/BOOKS/Efficient_c++> g++ -Wall dircheck.cpp markgray@soyo:/ARK/BOOKS/Efficient_c++> ./a.out /tmp /tmp is a directory markgray@soyo:/ARK/BOOKS/Efficient_c++> ./a.out dircheck.cpp dircheck.cpp is a NOT directory markgray@soyo:/ARK/BOOKS/Efficient_c++> ./a.out no_such_thing no_such_thing is a NOT directory markgray@soyo:/ARK/BOOKS/Efficient_c++> See man 2 stat. (You will be advised of course to check out the other macros described in the man page). To create a directory, see man 2 mkdir. To move a file, see man 2 rename. Hope this helps. [snip]

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Directory Handling -- New to C++
by linuxdev＠sptc.net 21 Dec '04

21 Dec '04

Hello, I am trying to write a program in C++ and I need to check to see if a directory exists, if not create it, move a file and verify that all works well. How do I go about this in Linux? This is a slightly better description: I am reading a running a program and passing a filename of a binary file as a command line argument. In this file I extract information that will be stored in a database, and then the file will be moved to a certain directory for usage by another application. Where I put the file depends on information I get from the DB. The base directory will be the same but subdirectories will be different. Therefore, I must check to see if the directory and file exists, if not I create the directory and then move the file from the location specified by the command line arguments to the new location. Any help will be appreciated. Again, please make it simple. I am still a bit ignorant in the C++ world (especially in Linux). Using SuSE 9.1 Pro, gcc-3.3.3-41 Thanks, DC

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need info about Evolution 2.0.1
by Srivatsa Krishnaswamy 17 Dec '04

17 Dec '04

Hi, I am running Suse 9.2. I am trying to install the Ximian connector 2.1.1 for Ximian Evolution 2.0.1 but after untar, when I run a ./configure, I get the error given below. Can you tell me from where I can get the Evolution development libraries. ################################################################################ riazrahaman:/home/riazrahaman/temp/ximian-connector-2.1.1 # ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking Evolution version... configure: error: Evolution development libraries not installed ################################################################################ regards, Srivatsa Krishnaswamy -- Srivatsa Krishnaswamy <vatsak(a)hp.com> HP

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Top CPU and Mem Jobs?
by Patrick B. O'Brien 15 Dec '04

15 Dec '04

How can I send my top CPU and Memory user jobs to an outfile? TIA.

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PS1 in color, what about a hostname too?
by Patrick B. O'Brien 14 Dec '04

14 Dec '04

This PS1 is cool, but I have several SuSe Boxes. I'd like my PS1 to include my hostname too, any help? TIA! #v+ PROMPT_COMMAND='PS1=`if test "$UID" = 0 ; then \ echo "\[\033[33;40m\]\u:\`pwd -P\` #\[\033[0m\] " ; \ else \ echo "\[\033[32;40m\]\u:\`pwd -P\` $\[\033[0m\] " ; \ fi `' #v-

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openSUSE Programming December 2004