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Eiger: Difference between revisions
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== General aspects == | == General aspects == | ||
# The framecache of XDS uses memory to save on I/O; it saves a frame in RAM after reading it for the first time. By default, each XDS (or mcolspot/mintegrate) job stores NUMBER_OF_IMAGES_IN_CACHE=DELPHI/OSCILLATION_RANGE images in memory which corresponds to one DELPHI-sized batch of data. This requires (number of pixels)*(number of jobs)*4 Bytes per frame which amounts to 72 MB in case of the Eiger 16M when running with MAXIMUM_NUBER_OF_JOBS=1. (If DELPHI=20 and OSCILLATION_RANGE=0.05 your computer thus has to have at least 400*72MB = 29GB of memory for each job!). If memory allocation fails, the fallback is to the old behaviour of reading each frame three times (instead of once). | # The framecache of XDS uses memory to save on I/O; it saves a frame in RAM after reading it for the first time. By default, each XDS (or mcolspot/mintegrate) job stores NUMBER_OF_IMAGES_IN_CACHE=DELPHI/OSCILLATION_RANGE images in memory which corresponds to one DELPHI-sized batch of data. This requires (number of pixels)*(number of jobs)*4 Bytes per frame which amounts to 72 MB in case of the Eiger 16M when running with MAXIMUM_NUBER_OF_JOBS=1. (If DELPHI=20 and OSCILLATION_RANGE=0.05 your computer thus has to have at least 400*72MB = 29GB of memory for each job!). If memory allocation fails, the fallback is to the old behaviour of reading each frame three times (instead of once). | ||
# Dectris provides the ''Neggia'' library ([https://github.com/dectris/neggia source],[https://www.dectris.com/support/downloads/sign-in binary]) for native reading of HDF5 files, which can be loaded into XDS at runtime using the <code>[[LIB]]=</code> [http:// | # Dectris provides the ''Neggia'' library ([https://github.com/dectris/neggia source],[https://www.dectris.com/support/downloads/sign-in binary]) for native reading of HDF5 files, which can be loaded into XDS at runtime using the <code>[[LIB]]=</code> [http://xds.mpimf-heidelberg.mpg.de/html_doc/xds_parameters.html#LIB= keyword]. With this library (which can also be found at ftp://turn5.biologie.uni-konstanz.de/pub/linux_bin for Linux, and at ftp://turn5.biologie.uni-konstanz.de/pub/mac_bin for MacOS), no conversion to CBF or otherwise is necessary. It is therefore just as fast and efficient to read HDF5 files as any other file format. At Diamond Light Source, a different HDF5 format was developed, and this requires the [https://github.com/DiamondLightSource/durin/releases/latest ''Durin'' plugin]. The latter can also read the HDF5 files written by the Dectris software. | ||
A suitable [[XDS.INP]] may have been written by the data collection (beamline) software. Latest [[generate_XDS.INP]] (<code>generate_XDS.INP xxx_master.h5</code>) or the [[Eiger#Script_for_generating_XDS.INP_from_master.h5|XDS_from_H5.py script]] can be used if XDS.INP is not available. | A suitable [[XDS.INP]] may have been written by the data collection (beamline) software. Latest [[generate_XDS.INP]] (<code>generate_XDS.INP xxx_master.h5</code>) or the [[Eiger#Script_for_generating_XDS.INP_from_master.h5|XDS_from_H5.py script]] can be used if XDS.INP is not available. | ||
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Deviating from the Xeon benchmark setup, BACKGROUND_RANGE was set to a more realistic value of 1 50 (instead of 1 9). | Deviating from the Xeon benchmark setup, BACKGROUND_RANGE was set to a more realistic value of 1 50 (instead of 1 9). | ||
Using the Dectris library that makes use of the <code>[[LIB]]=</code> [http:// | Using the Dectris library that makes use of the <code>[[LIB]]=</code> [http://xds.mpimf-heidelberg.mpg.de/html_doc/xds_parameters.html#LIB= option] of XDS: | ||
INIT: elapsed wall-clock time 30.4 sec | INIT: elapsed wall-clock time 30.4 sec | ||
COLSPOT: elapsed wall-clock time 40.7 sec | COLSPOT: elapsed wall-clock time 40.7 sec | ||