要用 ghz CLI 打 Benchmark，可先參考 ghz CLI 的使用說明。
usage: ghz [] []
Flags:
-h, --help Show context-sensitive help (also try --help-long and --help-man).
--config= Path to the JSON or TOML config file that specifies all the test run settings.
--proto= The Protocol Buffer .proto file.
--protoset= The compiled protoset file. Alternative to proto. -proto takes precedence.
--call= A fully-qualified method name in 'package.Service/method' or 'package.Service.Method' format.
-i, --import-paths= Comma separated list of proto import paths. The current working directory and the directory of the protocol buffer file are automatically added to the import list.
--cacert= File containing trusted root certificates for verifying the server.
--cert= File containing client certificate (public key), to present to the server. Must also provide -key option.
--key= File containing client private key, to present to the server. Must also provide -cert option.
--cname= Server name override when validating TLS certificate - useful for self signed certs.
--skipTLS Skip TLS client verification of the server's certificate chain and host name.
--insecure Use plaintext and insecure connection.
--authority= Value to be used as the :authority pseudo-header. Only works if -insecure is used.
-c, --concurrency=50 Number of requests to run concurrently. Total number of requests cannot be smaller than the concurrency level. Default is 50.
-n, --total=200 Number of requests to run. Default is 200.
-q, --qps=0 Rate limit, in queries per second (QPS). Default is no rate limit.
-t, --timeout=20 Timeout for each request in seconds. Default is 20, use 0 for infinite.
-z, --duration=0 Duration of application to send requests. When duration is reached, application stops and exits. If duration is specified, n is ignored. Examples: -z 10s -z 3m.
-x, --max-duration=0 Maximum duration of application to send requests with n setting respected. If duration is reached before n requests are completed, application stops and exits.
Examples: -x 10s -x 3m.
--connections=1 Number of connections to use. Concurrency is distributed evenly among all the connections. Default is 1.
-d, --data= The call data as stringified JSON. If the value is '@' then the request contents are read from stdin.
-D, --data-file= File path for call data JSON file. Examples: /home/user/file.json or ./file.json.
-b, --binary The call data comes as serialized binary message or multiple count-prefixed messages read from stdin.
-B, --binary-file= File path for the call data as serialized binary message or multiple count-prefixed messages.
-m, --metadata= Request metadata as stringified JSON.
-M, --metadata-file= File path for call metadata JSON file. Examples: /home/user/metadata.json or ./metadata.json.
--stream-interval=0 Interval for stream requests between message sends.
--reflect-metadata= Reflect metadata as stringified JSON used only for reflection request.
-o, --output= Output path. If none provided stdout is used.
-O, --format= Output format. One of: summary, csv, json, pretty, html, influx-summary, influx-details. Default is summary.
--connect-timeout=10 Connection timeout in seconds for the initial connection dial. Default is 10.
--keepalive=0 Keepalive time in seconds. Only used if present and above 0.
--name= User specified name for the test.
--tags= JSON representation of user-defined string tags.
--cpus=8 Number of cpu cores to use.
-v, --version Show application version.
Args:
[] Host and port to test.
比較常用的有 –proto、–call、-d、-c、-n、–connections、-O、-o 這幾個參數。
像是要打一個 Benchmark 就會用 –proto 指定 proto 檔的位置、用 –call 指定要調用哪個 proto service、-d 指定 proto service 調用時所需要的資料、-c 指定 Benchmark 的 concurrent 數、-n 指定 Benchmark 要發送的數量，最後帶上 gRPC service 的 IP。
ghz –proto $protofile –call $protoservice -d ‘$protodata’ -c $concurrency -n $numbers –insecure $ip
運行的結果有點類似 Apache 的 ab，可看到處理時間的統計與分佈。
如果要設定 Benchmark 的 gRPC 連線數，可使用 –connections 指定。若不指定預設是使用一個 gRPC 連線，不論設多少的 Concurrent 都共用這條連線。
ghz –proto $protofile –call $protoserv ice -d ‘$protodata’ –connections $connections -c $concurrency -n $numbers –insecure $ip
除了直接 Console 顯示 Benchmark 的結果，ghz 也提供了輸出成報表檔的功能，支援輸出 json 、html、csv、… 等格式，可透過 -O 指定輸出的格式，並透過 -o 指定輸出檔案的位置。
ghz –proto $protofile –call $protoservice -d ‘$protodata’ -c $concurrency -n $numbers –insecure $ip -O html -o $outputfile
