[Parca]測試 Polar Signals 開源 Parca (基於eBPF 的profiler)

前陣子發現在Github上有個open-source projects: Parca (包含Server & Agent )，扒文了一下，Parca是Solar Signals的一個開源項目。它是持續分析存儲、查詢引擎和一個基於eBPF 的profiler。其目的在通過系統地測量代碼性能將可觀察性空間提升到一個新的水平，使每個人都能夠優化他們的代碼。

Parca 旨在將持續分析技術帶給所有人；其打包了許多開箱即用的功能，包括收集、存儲和提供可用於長期查詢的profiles 的能力— 包括CPU 分析，以確定CPU 執行一段特定代碼所需的時間。相關資源如下:

[eBPF] The example of using BCC's trace.py script

If you want to use a container to run BCC's script, you can follow the instructions to build a Docker image and run it as a container.

Dockerfile

FROM ubuntu:18.04

RUN apt update && apt install -y lsb-core vim curl cscope cmake ctags file git locales bison flex iperf netperf android-tools-adb build-essential libedit-dev zlib1g-dev libelf-dev tree wget openjdk-8-jdk libgtk-3-dev iputils-ping
RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 4052245BD4284CDD
RUN echo "deb https://repo.iovisor.org/apt/$(lsb_release -cs) $(lsb_release -cs) main" > /etc/apt/sources.list.d/iovisor.list
RUN apt update && apt-get install -y bcc-tools libbcc-examples

Build a Docker image

sudo docker build -t bcc-ebpf .

Run the Docker image as a container 

sudo docker run -d --name bcc \
    --privileged \
    -v $(pwd):/bcc \
    -v /lib/modules:/lib/modules:ro \
    -v /usr/src:/usr/src:ro \
    -v /boot:/boot:ro \
    -v /sys/kernel/debug:/sys/kernel/debug \
    bcc-ebpf sleep 3600d

The examples of using BCC's trace.py
python trace.py 'r:bash:readline "%s", retval'
python trace.py 'u:/lib/x86_64-linux-gnu/libc-2.27.so:memory_sbrk_more "%u", arg1' -T

./trace.py 'python:_PyImport_LoadDynamicModule "name: %s path: %s" arg1, arg2' \
        'r:python:_PyImport_LoadDynamicModule "at 0x%x" retval'

./trace.py 'r:bash:readline "%s" retval'

./trace.py '/home/bgregg/functions:main.add "%d %d" arg1, arg2'

# List functions in the executable file
readelf -s test
objdump -t test
objdump -D test


Reference:
Linux eBPF/bcc uprobes
http://www.brendangregg.com/blog/2016-02-08/linux-ebpf-bcc-uprobes.html
Using user-space tracepoints with BPF

https://github.com/zoidbergwill/awesome-ebpf
https://lwn.net/Articles/753601/

[eBPF] An example of Userspace Tracing

#!/usr/bin/python

from __future__ import print_function
from bcc import BPF
from time import sleep

# load BPF program

b = BPF(text="""
#include <uapi/linux/ptrace.h>
struct key_t {
    char c[80];
};
BPF_HASH(counts, struct key_t);

int count(struct pt_regs *ctx) {
    if (!PT_REGS_PARM1(ctx))
        return 0;

    struct key_t key = {};
    u64 zero = 0, *val;
    bpf_probe_read(&key.c, sizeof(key.c), (void *)PT_REGS_PARM1(ctx));
    val = counts.lookup_or_init(&key, &zero);
    (*val)++;
    return 0;
};
""")

b.attach_uprobe(name="c", sym="strlen", fn_name="count")

# header
print("Tracing strlen()... Hit Ctrl-C to end.")

# sleep until Ctrl-C
try:
    sleep(99999999)
except KeyboardInterrupt:
    pass

# print output
print("%10s %s" % ("COUNT", "STRING"))
counts = b.get_table("counts")
for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
    print("%10d \"%s\"" % (v.value, k.c.encode('string-escape')))


Reference:
https://github.com/iovisor/bcc/blob/master/tools/bashreadline.py
https://github.com/iovisor/bcc/blob/master/tools/gethostlatency.py
https://github.com/iovisor/bcc/blob/master/tools/funccount.py
https://github.com/iovisor/bcc/blob/master/tools/memleak.py
https://github.com/iovisor/bcc/blob/master/tools/dbslower.py
https://github.com/iovisor/bcc/blob/master/tools/trace.py

Golang bcc/BPF Function Tracing
http://www.brendangregg.com/blog/2017-01-31/golang-bcc-bpf-function-tracing.html


Linux bcc/BPF Node.js USDT Tracing

//Search "attach_uprobe path:tools language:python" in github project:  iovisor/bcc 

https://github.com/iovisor/bcc/search?q=attach_uprobe+path%3Atools+language%3Apython&unscoped_q=attach_uprobe+path%3Atools+language%3Apython&type=Code

eBPF監控工具bcc系列七開發腳本
https://blog.csdn.net/weixin_33824363/article/details/89728890