ec151037af
Add benchmark to measure the throughput and latency of the bpf_loop
call.
Testing this on my dev machine on 1 thread, the data is as follows:
nr_loops: 10
bpf_loop - throughput: 198.519 ± 0.155 M ops/s, latency: 5.037 ns/op
nr_loops: 100
bpf_loop - throughput: 247.448 ± 0.305 M ops/s, latency: 4.041 ns/op
nr_loops: 500
bpf_loop - throughput: 260.839 ± 0.380 M ops/s, latency: 3.834 ns/op
nr_loops: 1000
bpf_loop - throughput: 262.806 ± 0.629 M ops/s, latency: 3.805 ns/op
nr_loops: 5000
bpf_loop - throughput: 264.211 ± 1.508 M ops/s, latency: 3.785 ns/op
nr_loops: 10000
bpf_loop - throughput: 265.366 ± 3.054 M ops/s, latency: 3.768 ns/op
nr_loops: 50000
bpf_loop - throughput: 235.986 ± 20.205 M ops/s, latency: 4.238 ns/op
nr_loops: 100000
bpf_loop - throughput: 264.482 ± 0.279 M ops/s, latency: 3.781 ns/op
nr_loops: 500000
bpf_loop - throughput: 309.773 ± 87.713 M ops/s, latency: 3.228 ns/op
nr_loops: 1000000
bpf_loop - throughput: 262.818 ± 4.143 M ops/s, latency: 3.805 ns/op
>From this data, we can see that the latency per loop decreases as the
number of loops increases. On this particular machine, each loop had an
overhead of about ~4 ns, and we were able to run ~250 million loops
per second.
Signed-off-by: Joanne Koong <joannekoong@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211130030622.4131246-5-joannekoong@fb.com
75 lines
1.4 KiB
Bash
75 lines
1.4 KiB
Bash
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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RUN_BENCH="sudo ./bench -w3 -d10 -a"
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function header()
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{
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local len=${#1}
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printf "\n%s\n" "$1"
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for i in $(seq 1 $len); do printf '='; done
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printf '\n'
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}
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function subtitle()
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{
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local len=${#1}
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printf "\t%s\n" "$1"
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}
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function hits()
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{
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echo "$*" | sed -E "s/.*hits\s+([0-9]+\.[0-9]+ ± [0-9]+\.[0-9]+M\/s).*/\1/"
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}
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function drops()
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{
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echo "$*" | sed -E "s/.*drops\s+([0-9]+\.[0-9]+ ± [0-9]+\.[0-9]+M\/s).*/\1/"
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}
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function percentage()
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{
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echo "$*" | sed -E "s/.*Percentage\s=\s+([0-9]+\.[0-9]+).*/\1/"
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}
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function ops()
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{
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echo -n "throughput: "
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echo -n "$*" | sed -E "s/.*throughput\s+([0-9]+\.[0-9]+ ± [0-9]+\.[0-9]+\sM\sops\/s).*/\1/"
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echo -n -e ", latency: "
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echo "$*" | sed -E "s/.*latency\s+([0-9]+\.[0-9]+\sns\/op).*/\1/"
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}
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function total()
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{
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echo "$*" | sed -E "s/.*total operations\s+([0-9]+\.[0-9]+ ± [0-9]+\.[0-9]+M\/s).*/\1/"
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}
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function summarize()
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{
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bench="$1"
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summary=$(echo $2 | tail -n1)
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printf "%-20s %s (drops %s)\n" "$bench" "$(hits $summary)" "$(drops $summary)"
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}
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function summarize_percentage()
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{
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bench="$1"
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summary=$(echo $2 | tail -n1)
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printf "%-20s %s%%\n" "$bench" "$(percentage $summary)"
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}
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function summarize_ops()
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{
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bench="$1"
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summary=$(echo $2 | tail -n1)
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printf "%-20s %s\n" "$bench" "$(ops $summary)"
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}
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function summarize_total()
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{
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bench="$1"
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summary=$(echo $2 | tail -n1)
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printf "%-20s %s\n" "$bench" "$(total $summary)"
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}
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