A tool for measuring the throughput and response time of an arbitrary function (typically, a network request). A benchmark library written in Go.
If you look around the Web, many benchmarks focus on the able to measure a variety of metrics from a single function (e.g. an HTTP server).
knock is interested in obtaining two metrics - throughput and response time - from an arbitrary function.
Usage:
knock [OPTIONS]
Help Options:
-h, --help= Show this help message
Application Options:
-c, --clients=CLIENTS the number of individual load elements (0)
-d, --duration=SECONDS the number of seconds to run this benchmark (0)
-v, --verbose
-p= additional properties ({})
--version display version information (false)
--client-stats whether or not to track individual client statistics (false)
-r, --runtime-profile=STR Go runtime profiles (e.g. cpu, memory, block, threadcount, or behavior-specifc) ({})export KNOCK_URL=-p mongodb.url:mongodb://localhost:27017
export KNOCK_EXP_CONF=-p mongodb.run:writes -p mongodb.writeConcern:w=1 -p mongodb.doc_length:512
export KNOCK_REPORT_FILE=results/writes-512b-c4-w1.tsv
knock -c4 -d15 -v $KNOCK_URL $KNOCK_EXP_CONF > $KNOCK_REPORT_FILEAlthough you can run knock directly from the command-line, it's currently easier to schedule an entire test plan from a script. See the Ruby files in the /scripts folder for examples.
I wasn't able to find a MongoDB benchmarking tool that was able to examine the behavior of atomic increments under varying Write Concerns, so I wrote the tool myself in a way that is constrained enough (i.e. only 2 metrics) to be plausibly extensible.