The resource Module

(Unix only, Optional) The resource module is used to query or modify the system resource current settings limits. Example 12-10 shows how to use the module to query, and Example 12-11 shows how to modify resource limits.

Example 12-10. Using the resource Module to Query Current Settings

File: resource-example-1.py import resource print "usage stats", "=>", resource.getrusage(resource.RUSAGE_SELF) print "max cpu", "=>", resource.getrlimit(resource.RLIMIT_CPU) print "max data", "=>", resource.getrlimit(resource.RLIMIT_DATA) print "max processes", "=>", resource.getrlimit(resource.RLIMIT_NPROC) print "page size", "=>", resource.getpagesize() usage stats => (0.03, 0.02, 0, 0, 0, 0, 75, 168, 0, 0, 0, 0, 0, 0, 0, 0) max cpu => (2147483647, 2147483647) max data => (2147483647, 2147483647) max processes => (256, 256) page size => 4096

Example 12-11. Using the resource Module to Limit Resources

File: resource-example-2.py import resource resource.setrlimit(resource.RLIMIT_CPU, (0, 1)) # pretend we're busy for i in range(1000): for j in range(1000): for k in range(1000): pass CPU time limit exceeded