The value of max user processes is only 1024 on all pbsnodes.
ulimit -u 1024
Threads count as processes in *unix, so it is not possible to create more than 1024 pthreads, which is such a low limit on such powerful hardware.
A four core VM on other pulbic cloud
ulimit -u 95180
Thanks for posting in Intel communities.
Since this is a duplicate thread of https://community.intel.com/t5/Intel-DevCloud/max-user-processes-inside-jobs-too-low/m-p/1390522#M48... , we will no longer monitor this thread. We will continue addressing this issue in the other thread.