Standard operation, ZooKeeper in standalone mode. Low results are due to poor IO and synchronous.

Connecting to localhost:2181 
Connected in 32 ms, handle is 0 
Testing latencies on server localhost:2181 using syncronous calls 
created     100 permanent znodes  in   3240 ms (32.400360 ms/op 30.863854/sec) 
set         100           znodes  in   3140 ms (31.401310 ms/op 31.845805/sec) 
get         100           znodes  in     12 ms (0.120490 ms/op 8299.471674/sec) 
deleted     100 permanent znodes  in   3097 ms (30.978870 ms/op 32.280067/sec) 
created     100 ephemeral znodes  in   3150 ms (31.501360 ms/op 31.744661/sec) 
watched     100           znodes  in      8 ms (0.088539 ms/op 11294.442051/sec) 
deleted     100 ephemeral znodes  in   3201 ms (32.013500 ms/op 31.236822/sec) 
notif       100           watches in   1001 ms (10.010650 ms/op 99.893612/sec) 


With ZooKeeper running using libeatmydata (ie. FSyncs are no-ops).

Connecting to localhost:2181 
Connected in 4 ms, handle is 0 
Testing latencies on server localhost:2181 using syncronous calls 
created   10000 permanent znodes  in   1730 ms (0.173066 ms/op 5778.139387/sec) 
set       10000           znodes  in   1109 ms (0.110961 ms/op 9012.159302/sec) 
get       10000           znodes  in    744 ms (0.074433 ms/op 13434.958406/sec) 
deleted   10000 permanent znodes  in    979 ms (0.097926 ms/op 10211.773024/sec) 
created   10000 ephemeral znodes  in   1141 ms (0.114157 ms/op 8759.879735/sec) 
watched   10000           znodes  in    758 ms (0.075869 ms/op 13180.645025/sec) 
deleted   10000 ephemeral znodes  in   1225 ms (0.122575 ms/op 8158.297626/sec) 
notif     10000           watches in   1001 ms (0.100108 ms/op 9989.199395/sec)