Difference: MassSe (11 vs. 12)
Revision 122010-05-07 - AndrasLaszlo
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Mass file handling on the Grid (the GSTREAM library) | ||||||||
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| > > | Installation | |||||||
Note: The GSTREAM library is installed on the KFKI AFS . Look at that page for instructions on activation. | ||||||||
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| > > | To install it to your computer, download GSTREAM, then say:
tar -xzf gstream.tar.gz cd gstream ./configure [--prefix=some_installation_path] make make install | |||||||
The GSTREAM library for read/write C++ streams to Storage ElementsAs one does generally not want to always stage out the data files from SE-s onto a local disk by hand, and then process it, it is recommended to have read/write streams. The C++ library GSTREAM implements such a library. (gstream, igstream, ogstream stream classes, like the usual C++ STL fstream, ifstream, ofstream file input/output stream classes; the letter 'g' standing for 'grid'.) It does nothing else, but treats the file as a normal file, unless its name begins with the string /grid/. In this case, it stages out the datafile in question onto a local (or AFS) area, and then treats the local file as a normal file. Sooner or later this solution has to be replaced with a GFAL based C++ library. | ||||||||
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| int main(int argc, char *argv[]) { | ||||||||
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| > > | // Set debug and checksum levels for verifying what is happening (default: 0, i.e. don't check). gstream_debug(1); gstream_checksum(1); | |||||||
| // Open the datafile for reading. igstream igfile("/grid/cms/alaszlo/some_datafile.dat"); // Extract data from your datafile with 'igstream::operator>>' or with 'igstream::read(char*, int)'. | ||||||||
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| The wrapper scripts may be improved in the future. We thank to Kálmán Kővári for this toolkit. There are also other useful scripts in the package. Please have a look a them. | ||||||||
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| < < | Also the scripts gexists.sh, gput.sh, grep.sh, gget.sh, gdel.sh may be helpful to manipulate single files. | |||||||
| > > | Also the scripts gexists.sh, gput.sh, grep.sh, gget.sh, gdel.sh, gcheck.sh may be helpful to manipulate single files. | |||||||
| -- AndrasLaszlo - 10 Jul 2009 | ||||||||
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View topic | History: r13 < r12 < r11 < r10 | More topic actions...
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