Sun Performance and Tuning: Java™ and the Internet, Second Edition

Customizing the Execution Environment

The execution environment is largely controlled by the shell. There is a command which can be used to constrain a program that is hogging too many resources. For csh the command is limit; for sh and ksh the command is ulimit. A default set of Solaris 2 resource limits is shown in Table 7-1.

Users can increase limits up to the hard system limit. The superuser can set higher limits. The limits on data size and stack size are 2 Gbytes on recent machines with the SPARC Reference MMU but are limited to 512 Mbytes and 256 Mbytes respectively by the sun4c MMU used in the SPARCstation 1 and 2 families of machines.

Table 7-1. Resource Limits

Resource Name	Soft User Limit	Hard System Limit
cputime	unlimited	unlimited ...