feat(bigtable): loadtest support app profile

[stephennancekivell]

Hi, I found using an app profile greatly improved my 99th performance. So it would be nice to support it profiles in loadtest.

Can be used like this.

./loadtest -project $PROJECT -instance $INSTANCE
2022/04/11 17:06:02 -creds flag unset, will use gcloud credential
2022/04/11 17:06:03 Dialing connections...
2022/04/11 17:06:03 Setting up scratch table...
2022/04/11 17:06:47 Starting load test... (run for 5s)
2022/04/11 17:06:58 Reads (2036 ok / 2036 tries):
min:             3.55575ms
median:          5.755416ms
max:             7.140176875s
95th percentile: 1.187244416s
99th percentile: 6.039376264s
2022/04/11 17:06:58 Writes (2060 ok / 2060 tries):
min:             3.952833ms
median:          6.225167ms
max:             7.369702958s
95th percentile: 1.47177056s
99th percentile: 5.784249186s
➜  bigtable git:(main) ✗ ./loadtest -project $PROJECT -instance $INSTANCE -app_profile syd
2022/04/11 17:07:05 -creds flag unset, will use gcloud credential
2022/04/11 17:07:06 Dialing connections...
2022/04/11 17:07:06 Setting up scratch table...
2022/04/11 17:08:36 Starting load test... (run for 5s)
2022/04/11 17:08:41 Reads (18951 ok / 18951 tries):
min:             3.921583ms
median:          10.810541ms
max:             315.866792ms
95th percentile: 22.642271ms
99th percentile: 40.233812ms
2022/04/11 17:08:41 Writes (18686 ok / 18686 tries):
min:             4.494417ms
median:          11.303666ms
max:             328.434125ms
95th percentile: 22.95579ms
99th percentile: 41.21401ms

[codyoss]

Hey @stephennancekivell would you please mind opening up a corresponding issue for discussion about adding this feature. Thanks.

[stephennancekivell]

Hi @codyoss, sure thing. #5883