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System Administration Guide: Resource Management and Network Services

How to Set the Maximum Number of LWPs for Each Task in a Project

Type this entry in the /etc/project database to set the maximum number of LWPs in each task in project x-files to 3. 


x-files:100::root::task.max-lwps=(privileged,3,deny)

When superuser creates a new task in project x-files by joining it with newtask, superuser cannot create more than three LWPs while running in this task, as shown in the following annotated sample session.


# newtask -p x-files csh

# prctl -n task.max-lwps $$
688: csh
task.max-lwps
                            3 privileged deny
                   2147483647 system     deny
# id -p
uid=0(root) gid=1(other) projid=100(x-files)

# ps -o project,taskid -p $$
 PROJECT TASKID
 x-files   236

# csh        /* creates second LWP */

# csh        /* creates third LWP */

# csh        /* cannot create more LWPs */
Vfork failed

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