grpc¶
Generate requests for a gRPC service and and collect latency and error-related metrics.
Usage example¶
In this experiment, the grpc
task generates call requests for a gRPC service hosted at hello.default:50051
, defined in the protobuf file located at grpc.protoURL
, with a gRPC method named helloworld.Greeter.SayHello
. Metrics collected by this task are used by the assess
task to validate SLOs.
iter8 k launch \
--set "tasks={grpc,assess}" \
--set grpc.host="hello.default:50051" \
--set grpc.call="helloworld.Greeter.SayHello" \
--set grpc.protoURL="https://raw.githubusercontent.com/grpc/grpc-go/master/examples/helloworld/helloworld/helloworld.proto" \
--set assess.SLOs.upper.grpc/error-rate=0 \
--set assess.SLOs.upper.grpc/latency/p'97\.5'=800 \
--set runner=job
Parameters¶
Any field in the Config
struct of the ghz
runner package can be used as a parameter in this task. The JSON tags of the struct fields directly correspond to the names of the parameters of this task. In the usage example, the parameters host
and call
correspond to the Call
and Host
fields respectively in the Config
struct.
In addition, the following fields are defined by this task.
Name | Type | Description |
---|---|---|
protoURL | string (URL) | URL where the protobuf file that defines the gRPC service is located. |
dataURL | string (URL) | URL where JSON data to be used in call requests is located. |
binaryDataURL | string (URL) | URL where binary data to be used in call requests is located. |
metadataURL | string (URL) | URL where the JSON metadata data to be used in call requests is located. |
Metrics¶
This task creates a built-in provider named grpc
. The following metrics are collected by this task:
grpc/request-count
: total number of requests sentgrpc/error-count
: number of error responsesgrpc/error-rate
: fraction of error responses
The following latency metrics are also supported by this task.
grpc/latency/mean
: mean latencygrpc/latency/stddev
: standard deviation of latencygrpc/latency/min
: min latencygrpc/latency/max
: max latencygrpc/latency/pX
: Xth percentile latency, for any X in the range 0.0 to 100.0
All latency metrics have msec
units.