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doku:memory [2014/08/12 10:07] – [ad 2. parallel environment with fewer processes per node] irdoku:memory [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
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 ==== ad 3. increased virtual memory ==== ==== ad 3. increased virtual memory ====
  
-Some programs allocate more memory than they use. This was especially true in old FORTRAN 77 programs, which had to decide at compile time how much memory will be used. These programs are allowed to allocate 50% more memory than available by '''#$ -l overcommit_mem=true''' in the job script. Unfortunately it might happen that the whole node crashes, reboots and leaves the queuing system, so please use this option wisely!+Some programs allocate more memory than they use. This was especially true in old FORTRAN 77 programs, which had to decide at compile time how much memory will be used. These programs are allowed to allocate 50% more memory than available by ''#$ -l overcommit_mem=true'' in the job script. Unfortunately it might happen that the whole node crashes, reboots and leaves the queuing system, so please use this option wisely!
  
 ==== ad 4. swap space (still experimental) ==== ==== ad 4. swap space (still experimental) ====
  
 A novel feature of the VSC-2 is remote swap space (implemented using 'SCSI RDMA Protocol', SRP), which is used by specifying '''#$ -l swapsize_GB=32''' or a multiple of 32. Each node of a job gets the same amount of swap space. A novel feature of the VSC-2 is remote swap space (implemented using 'SCSI RDMA Protocol', SRP), which is used by specifying '''#$ -l swapsize_GB=32''' or a multiple of 32. Each node of a job gets the same amount of swap space.
  • doku/memory.1407838047.txt.gz
  • Last modified: 2014/08/12 10:07
  • by ir