LSF Version 7.3 - Administering Platform LSF

Tuning UNIX for Large Clusters
614 Administering Platform LSF
◆ Load update intervals are scaled automatically
The following graph shows the improvement in LIM startup after the LSF
performance enhancements:
Tuning UNIX for Large Clusters
The following hardware and software specifications are requirements for a large
cluster that supports 5,000 hosts and 100,000 jobs at any one time.
In this section
◆ Hardware recommendation on page 614
◆ Software requirement on page 614
Hardware recommendation
LSF master host:
◆ 4 processors, one each for:
❖ mbatchd
❖ mbschd
❖ lim
❖ Operating system
◆ 10 GB Ram
Software requirement
To meet the performance requirements of a large cluster, increase the file descriptor
limit of the operating system.
The file descriptor limit of most operating systems used to be fixed, with a limit of
1024 open files. Some operating systems, such as Linux and AIX, have removed this
limit, allowing you to increase the number of file descriptors.
Y axis: # of hosts
x axis: Time in seconds