garenchan

#!/usr/bin/env bpftrace

#include <linux/sched.h>

BEGIN
{
    printf("Trace new processes via exec() syscalls. Hit Ctrl-C to end.\n");
}

tracepoint:syscalls:sys_enter_exec*

garenchan

// 打印traceback
// src/runtime/traceback.go
func traceback2() {
	// Everything throw does should be recursively nosplit so it
	// can be called even when it's unsafe to grow the stack.
	pc := getcallerpc()
	sp := getcallersp()
	gp := getg()

	traceback(pc, sp, 0, gp)

garenchan

增大open-files

Ubuntu默认的open files为1024, 可以通过ulimit -n来查看;

在高并发场景下, 网络服务打开的文件描述符可能会超过这个限制, 那么我们需要来增大这个值

临时性增大

执行如下命令, 会增大open files值, 但是重启后会被恢复

garenchan

#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
#

#kernel.domainname = example.com

# Uncomment the following to stop low-level messages on console
#kernel.printk = 3 4 1 3