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Introduction to BPF Performance Tools - Mars Cheng
tags:
COSCUP2020
入門
TR214
歡迎來到 https://hackmd.io/@coscup/2020 共筆
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Who am I
What is BPF
extend BPF
trace-cmd -> kernel -> trace.dat
post-processing -> result
bpf progs-> kernel -> reult1(caculated by step 2)
perffomance is the currency of computing
MIT 6.172
bpf is programmable
Tools for BPF performance
type:identifier1 讀多少 bytes 的次數
bpftrace -e 'profile:hz:49 /comm == "wc_nvive" / {@[ustack] = count();}'
舉例 1
producer - Consumer Problem
Dessign Decisions
Naive Producer-Consumer Solution
分析
Off-CPU analysis
Producer 的 wait 不真正影響時間
consumer
舉例2
How to use bpf
Off cpu queue empty 改進方法