make single threaded to avoid semaphores in inner loop
make single threaded to avoid semaphores in inner loop

cambridgehackers/connectal,csail-csg/connectal,hanw/connectal,8l/connectal,chenm001/connectal,hanw/connectal,8l/connectal,csail-csg/connectal,hanw/connectal,chenm001/connectal,csail-csg/connectal,cambridgehackers/connectal,8l/connectal,chenm001/connectal,csail-csg/connectal,cambridgehackers/connectal,8l/connectal,8l/connectal,chenm001/connectal,cambridgehackers/connectal,chenm001/connectal,csail-csg/connectal,hanw/connectal,hanw/connectal,cambridgehackers/connectal