adds docker-compose examples for python, ruby and go

Author: petethepig

examples/README.md

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+# Examples
+
+These are example projects we set up with pyroscope for you to try out. You'll need `docker` + `docker-compose` to run them:
+
+```shell
+cd golang
+docker-compose up --build
+```
+
+These are very simple projects where the application is basically one `while true` loop and inside that loop it calls a slow function and a fast function. Slow function takes about 80% of the time and the fast one takes about 20%.

examples/golang/Dockerfile

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+FROM golang:1.15.6
+
+WORKDIR /go/src/app
+
+COPY main.go ./main.go
+
+RUN go get -d ./
+RUN go build -o main .
+CMD ["./main"]

examples/golang/docker-compose.yml

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+---
+version: "3.9"
+services:
+  pyroscope:
+    image: "pyroscope/pyroscope:latest"
+    ports:
+      - "8080:8080"
+    command:
+      - "server"
+  app:
+    build: .

examples/golang/main

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+package main
+
+import (
+	"log"
+
+	"github.com/pyroscope-io/pyroscope/pkg/agent/profiler"
+)
+
+func work(n int) {
+	for i := 0; i < n; i++ {
+
+	}
+}
+
+func fastFunction() {
+	work(2000)
+}
+
+func slowFunction() {
+	work(8000)
+}
+
+func main() {
+	profiler.Start(profiler.Config{
+		ApplicationName: "simple.golang.app",
+		ServerAddress:   "http://pyroscope:8080", // this will run inside docker-compose, hence `pyroscope` for hostname
+	})
+
+	log.Println("test")
+	for {
+		fastFunction()
+		slowFunction()
+	}
+}

examples/golang/main.go

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+FROM python:3
+
+WORKDIR /usr/src/app
+
+COPY --from=pyroscope/pyroscope:latest /usr/bin/pyroscope /usr/bin/pyroscope
+COPY main.py ./main.py
+
+ENV PYROSCOPE_APPLICATION_NAME=simple.python.app
+ENV PYROSCOPE_SERVER_ADDRESS=http://pyroscope:8080/
+CMD ["pyroscope", "exec", "python", "main.py"]

examples/python/Dockerfile

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+---
+version: "3.9"
+services:
+  pyroscope:
+    image: "pyroscope/pyroscope:latest"
+    ports:
+      - "8080:8080"
+    command:
+      - "server"
+  app:
+    build: .
+    cap_add:
+      - SYS_PTRACE

examples/python/docker-compose.yml

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+def work(n):
+  i = 0
+  while i < n:
+    i += 1
+
+def fast_function():
+  work(20000)
+
+def slow_function():
+  work(80000)
+
+if __name__ == "__main__":
+  while True:
+    fast_function()
+    slow_function()

examples/python/main.py

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+FROM ruby:2.7.1
+
+WORKDIR /usr/src/app
+
+COPY --from=pyroscope/pyroscope:latest /usr/bin/pyroscope /usr/bin/pyroscope
+COPY main.rb ./main.rb
+
+ENV PYROSCOPE_APPLICATION_NAME=simple.ruby.app
+ENV PYROSCOPE_SERVER_ADDRESS=http://pyroscope:8080/
+CMD ["pyroscope", "exec", "ruby", "main.rb"]

examples/ruby/Dockerfile

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+---
+version: "3.9"
+services:
+  pyroscope:
+    image: "pyroscope/pyroscope:latest"
+    ports:
+      - "8080:8080"
+    command:
+      - "server"
+  app:
+    build: .
+    cap_add:
+      - SYS_PTRACE