$ gcc -O -o ngrace ngrace.c
$ ./ngrace 5
ngrace: connect data: Device not configured      # association attempts
$ ./ngrace 300000          # single-producer control
NGRACE-DONE 300000 sends
$ netstat -m | head -2     # before/after identical: 7/146632 mbufs, 256/33296 clusters
# multi-producer cross-CPU flood could not be armed (ng_connect_data ENXIO on
# live named nodes in this environment); code-certain race documented