Test glibc's arena allocations in containers

This is a project with a simple multi-threaded C program exercising malloc. It's useful to empirially verifying glibc's malloc_arena_new calls.

Usage

First, build 32 bit and 64 bit containers:

$ ./build_docker.sh

Next, run the containers as follows:

$ sudo docker run -it --cap-add=SYS_PTRACE --rm jerboaa/arena-malloc:1-centos7-64bit | grep -E 'TOTAL|processors|Spawning'
This system has 8 processors configured and 8 processors available.
Spawning a total of 72 (> (8 * 8)) threads
$64 = "TOTAL memory_arena_new calls: 63" 

$ sudo docker run -it --cap-add=SYS_PTRACE --rm jerboaa/arena-malloc:1-centos7-32bit | grep -E 'TOTAL|processors|Spawning'
This system has 8 processors configured and 8 processors available.
Spawning a total of 24 (> (2 * 8)) threads
$16 = "TOTAL memory_arena_new calls: 15"

The expectation is that it should be bound above by 8 * # CPU cores on 64 bit and 2 * # CPU cores on 32 bit.

Running with CPU Quota

Assigning only ~2 CPU cores to the container:

$ sudo docker run -it --cpu-period="100000" --cpu-quota="200000" --cap-add=SYS_PTRACE --rm jerboaa/arena-malloc:1-centos7-64bit | grep -E 'TOTAL|processors|Spawning'