0  in sub cpl===  2  in global
 my comp_id in sub cpl= 3
  sum of local ranks in cpl is  1
 I am cpl 0 (g=4), recv from land 2 (g=3)
 I am cpl 0, expect l2c(1)=100
 cpl 0 gets l2c(1)= 100
 
 0  in sub cpl===  2  in global
 my comp_id in sub cpl= 3
  sum of local ranks in cpl is  1
 I am cpl 0 (g=4), recv from land 2 (g=3)
 I am cpl 0, expect l2c(1)=100
 cpl 0 gets l2c(1)= 100