Always Free
提高永久免费的 2 个 x64 (2C1G) 虚拟机和 1个 ARM64 (4C24G)。
从 2023年1月底开始，Oracle 修改了使用条款，7天内始终空闲的免费虚拟机可能被回收。
https://docs.oracle.com/en-us/iaas/Content/FreeTier/freetier_topic-Always_Free_Resources.htm
Idle Always Free compute instances may be reclaimed by Oracle. Oracle will deem virtual machine and bare metal compute instances as idle if, during a 7-day period, the following are true:
- CPU utilization for the 95th percentile is less than 10%
- Network utilization is less than 10%
- Memory utilization is less than 10% (applies to A1 shapes only)(A1 = ARM)
保活
http://www.devin.com/lookbusy/
# ARM 机保活： 只要使用 10% 以上内存即可。
lookbusy -m 3072M -c 0
# x64 机保活：至少 5% 时间 CPU 利用率 >= 10%。
lookbusy -r curve -c 0-20 -m 0