Reboot all VM, set NUM_WORKLOADS = 1 in Control.config, everthing seems good. Please have a look.
[root@client1 SPECvirt]# tail -50 primectrl.out
0,0,2018-07-04 09:58:53:329,98754,7.1,98694,3.4,197226,8.6,293946,1.75
0,0,2018-07-04 09:59:03:330,98869,7.1,98807,3.4,197431,8.6,294264,1.75
0,0,2018-07-04 09:59:13:328,98976,7.1,98926,3.4,197645,8.6,294558,1.75
0,0,2018-07-04 09:59:23:329,99086,7.1,99043,3.4,197857,8.6,294868,1.75
0,0,2018-07-04 09:59:33:328,99203,7.1,99157,3.4,198083,8.6,295189,1.75
0,0,2018-07-04 09:59:43:329,99319,7.1,99289,3.4,198332,8.6,295509,1.75
0,0,2018-07-04 09:59:53:328,99449,7.1,99412,3.4,198557,8.6,295843,1.75
0,0,2018-07-04 10:00:03:328,99566,7.1,99527,3.4,198836,8.6,296299,1.75
0,0,2018-07-04 10:00:13:327,99717,7.1,99683,3.4,199150,8.6,296746,1.75
0,0,2018-07-04 10:00:23:327,99869,7.1,99849,3.4,199498,8.6,297209,1.75
0,0,2018-07-04 10:00:33:329,100037,7.1,100026,3.4,199800,8.6,297660,1.75
0,0,2018-07-04 10:00:43:328,100288,7.1,100255,3.4,200283,8.6,298545,1.75
0,0,2018-07-04 10:00:53:328,100555,7.1,100563,3.4,200918,8.6,299471,1.75
0,0,2018-07-04 10:01:03:328,100864,7.0,100916,3.4,201557,8.6,300378,1.75
0,0,2018-07-04 10:01:13:328,101210,7.0,101267,3.4,202254,8.6,301319,1.75
0,0,2018-07-04 10:01:23:328,101566,7.0,101645,3.4,202920,8.6,302171,1.75
0,0,2018-07-04 10:01:33:328,101863,7.0,101956,3.4,203552,8.6,303007,1.75
0,0,2018-07-04 10:01:43:328,102196,7.0,102294,3.4,204166,8.6,303828,1.75
0,0,2018-07-04 10:01:53:328,102533,7.0,102610,3.4,204813,8.6,304635,1.75
0,0,2018-07-04 10:02:03:328,102855,7.0,102910,3.4,205447,8.5,305431,1.75
0,0,2018-07-04 10:02:13:328,103136,7.0,103207,3.4,206023,8.5,306180,1.75
0,0,2018-07-04 10:02:23:329,103425,6.9,103483,3.3,206595,8.5,306944,1.75
0,0,2018-07-04 10:02:33:329,103727,6.9,103758,3.3,207213,8.5,307745,1.75
0,0,2018-07-04 10:02:43:328,103973,6.9,104017,3.3,207731,8.5,308340,1.75
0,0,2018-07-04 10:02:53:328,104217,6.9,104262,3.3,208206,8.5,308972,1.75
[root@dbserver ~]# cat /tmp/pollme.out
Creating RMI listener using RMI Registry port 8001
dbserver/192.168.1.178:8001 ready...
dbserver: 1530707072081
[root@appserver ~]# cat /tmp/pollme.out
Creating RMI listener using RMI Registry port 8001
appserver/192.168.1.151:8001 ready...
2018-07-04 08:24:31:825 contacting host 'specdb'...
appserver: 1530707071873
specdb: 1530707072081