When using mongostat with sleep interval set to 0, mongostat ends up never sleeping and prints a bunch of garbage data. Seems like it's never giving up control of its thread to the serverThread() threads so that they can gather data.
./mongostat 0 connected to: 127.0.0.1 insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn set repl time localhost -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.06g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 8 m101 PRI 20:39:39 localhost -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.06g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 8 m101 PRI 20:39:39 localhost:27017 no data localhost:27018 no data localhost:27019 no data localhost -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.06g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 8 m101 PRI 20:39:39 localhost:27017 no data localhost:27018 no data localhost:27019 no data localhost -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.06g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 8 m101 PRI 20:39:39 localhost:27017 no data localhost:27018 no data localhost:27019 no data localhost -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.06g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 9 m101 PRI 20:39:39 localhost:27017 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.06g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 9 m101 PRI 20:39:39 localhost:27018 no data localhost:27019 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648|-2147483648 -2147483648 -2147483648|-2147483648 -2147483648 288m 3.05g 6m -2147483648 local:nan% 0 0|0 0|0 -2147483648g -2147483648g 3 m101 SEC 20:39:39