Difference: LHCComputingGrid (13 vs. 14)
Revision 142006-04-10 - AndrasLaszlo
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Getting access to LHC Computing Grid. One can find a brief introductory material at the RMKI's getting started page , where you can find information on how to get access to LCG. There are also simple examples on that page.
Some more practical information on running a typical job. | ||||||||
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The files are stored on Storage Elements on the LCG. Usually these have different physical file administration schemes. Therefore, a logical layer was built on top of them, which makes the file access uniform from the user point of view. To use this facility , use the environmental variable LCG_CATALOG_TYPE:
export LCG_CATALOG_TYPE=lfc(for bash), or | ||||||||
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| < < | setenv LCG_CATALOG_TYPE lfc (for tcsh). | |||||||
| > > | setenv LCG_CATALOG_TYPE lfc(for tcsh). | |||||||
The Logical File Name (lfn) is resolved by the Logical File Catalogue (lfc) server. You have to specify this:
export LFC_HOST=lfc-cms.cern.ch(for bash), or | ||||||||
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| < < | setenv LFC_HOST lfc-cms.cern.ch (for tcsh). | |||||||
| > > | setenv LFC_HOST lfc-cms.cern.ch(for tcsh). | |||||||
Now you can refer to files with their logical file names, which are site-independent. The logical file names have to be unique. A very convenient way to generate them is to imitate the UNIX type file naming scheme. With the command lfc-mkdir one can make logical directories, like | ||||||||
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| You can get the library files here: pstream.h, gstream.h, gstream.cc. Before you can use it you have to export the following environmental variables: | ||||||||
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| < < | export VO=your_vo(for bash), or setenv VO your_vo (for tcsh), and | |||||||
| > > | export VO=your_vo(for bash), or setenv VO your_vo(for tcsh), and | |||||||
export DEST=your_favourite_storage_element(for bash), or | ||||||||
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| < < | setenv DEST your_favourite_storage_element (for tcsh). | |||||||
| > > | setenv DEST your_favourite_storage_element(for tcsh). | |||||||
Setting the environmental variable TMPDIR is optional. This specifies the local (or AFS) directory, where the datafiles are staged out (therefore, it has to have large disk space!). E.g.: | ||||||||
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| < < | export TMPDIR=/tmp(for bash), or setenv TMPDIR /tmp (for tcsh). | |||||||
| > > | export TMPDIR=/tmp(for bash), or setenv TMPDIR /tmp(for tcsh). | |||||||
If not specified, the current working directory ($PWD) is used, as this is recommended for grid jobs (the working nodes have large disk spaces). | ||||||||
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