usdsop cannot create a new process while running adadmin

Issue:- While trying to compile apps schema using adadmin we are getting below error after selecting number of parallel process:-
"aiosp2() Error: failure in usdspn()Contents of error buffer are:"usdsop cannot create a new process
Cause: usdsop encountered an error creating a new process.
[Reason].Action: Check that your system had enough resources to start a new process. Contact your system administrator to obtain more resou (RE"

Troubleshooting:- At first instance its seems to be clear case of memory limitation on the server. This issue was occuring for every tool invloving multiple worker.
We tried running adadmin using less number of worker and that worked, this confirmed issue on the OS memory on server.

Resolution:- Asked our OS admin to enlarge the swap space to 1.5 times the current size and it resolved the issue.

RCA:- System was almost out of swap space and increasing swap was only option to move further. You can check swap using vmstat, top or swap -l command.