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Inference Load Modes

Inference Load Modes#

Perf Analyzer has several modes for generating inference request load for a model.

Concurrency Mode#

In concurrency mode, Perf Analyzer attempts to send inference requests to the server such that N requests are always outstanding during profiling. For example, when using --concurrency-range=4, Perf Analyzer will to attempt to have 4 outgoing inference requests at all times during profiling.

Periodic Concurrency Mode#

In periodic concurrency mode, Perf Analyzer will periodically launch a new set of inference requests until the total number of inference requests that has been launched since the beginning reaches N requests.

For example, when using --periodic-concurrency-range 10:100:30, Perf Analyzer will start with 10 concurrent requests and for every step, it will launch 30 new inference requests until the total number of requests launched since the beginning reaches 100. Additionally, the user can also specify when to launch the new requests by specifying --request-period M. This will set Perf Analyzer to launch a new set of requests whenever all of the latest set of launched concurrent requests received M number of responses back from the server.

The user can also specify custom parameters to the model using --request-parameter <name:value:type> option. For instance, passing --request-parameter max_tokens:256:uint will set an additional parameter max_tokens of type int to 256 as part of the request.

perf_analyzer -m <model_name> -i grpc --async --streaming \
    --profile-export-file profile.json \
    --periodic-concurrency-range 10:100:30 \
    --request-period 10 \
    --request-parameter max_tokens:256:int

Note

The periodic concurrency mode is currently supported only by gRPC protocol and with decoupled models. Additionally, the user must also specify a file where Perf Analyzer could dump all the profiled data using --profile-export-file.

Request Rate Mode#

In request rate mode, Perf Analyzer attempts to send N inference requests per second to the server during profiling. For example, when using --request-rate-range=20, Perf Analyzer will attempt to send 20 requests per second during profiling.

Custom Interval Mode#

In custom interval mode, Perf Analyzer attempts to send inference requests according to intervals (between requests, looping if necessary) provided by the user in the form of a text file with one time interval (in microseconds) per line. For example, when using --request-intervals=my_intervals.txt, where my_intervals.txt contains:

100000
200000
500000

Perf Analyzer will attempt to send requests at the following times: 0.1s, 0.3s, 0.8s, 0.9s, 1.1s, 1.6s, and so on, during profiling.

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