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	XDS can be run in cluster mode using any command line job scheduling software such as Grid Engine, Condor, Torque/PBS, LSF, SLURM etc. We implemented Grid Engine. It is a distributed resource management system which monitors the CPU and memory usage of the available computing resources and schedules the job to the least used computer. Grid Engine was chosen due to its high scalability, cost effectiveness, ease of maintenance and high throughput. Grid Engine was developed by Sun Microsystems'^TM^' (Sun Grid Engine, SGE) and later acquired by Oracle'^TM^' and subsequently acquired by ~~UNIVA'^TM^'~~. The latest versions became closed source, but the older ones are open source supplied with many Linux distributions including Redhat/CentOS 6.x. There is also open source Open Grid Scheduler [[http://gridscheduler.sourceforge.net/]], Son of Gridengine [[https://arc.liv.ac.uk/trac/SGE ]]		XDS can be run in cluster mode using any command line job scheduling software such as Grid Engine, Condor, Torque/PBS, LSF, SLURM etc. We implemented Grid Engine. It is a distributed resource management system which monitors the CPU and memory usage of the available computing resources and schedules the job to the least used computer. Grid Engine was chosen due to its high scalability, cost effectiveness, ease of maintenance and high throughput. Grid Engine was developed by Sun Microsystems'^TM^' (Sun Grid Engine, SGE) and later acquired by Oracle'^TM^' and subsequently acquired by UNIVATM. The latest versions became closed source, but the older ones are open source supplied with many Linux distributions including Redhat/CentOS 6.x. There is also open source Open Grid Scheduler [[http://gridscheduler.sourceforge.net/]], Son of Gridengine [[https://arc.liv.ac.uk/trac/SGE ]]

	Grid Engine consists of a master node daemon named sgemaster which schedules jobs to execution nodes. On each execution node a daemon named sge_execd runs a job and sends a completion signal back to sgemaster. Jobs are submitted to sgemaster using command such as qsub or using DRMAA C, JAVA or IDL bindings from any applications want to run XDS.		Grid Engine consists of a master node daemon named sgemaster which schedules jobs to execution nodes. On each execution node a daemon named sge_execd runs a job and sends a completion signal back to sgemaster. Jobs are submitted to sgemaster using command such as qsub or using DRMAA C, JAVA or IDL bindings from any applications want to run XDS.