f1-micro bursting machine types allow instances to use additional physical CPU for short periods of time. If your instance requires more CPU than originally allocated, it can take advantage of the additional physical CPU instance. Burst instances are temporary and are only possible periodically:
Machine name |
Virtual CPUs |
Memory (GB) |
Max number of persistent disks (PD) |
Max total PD size (TB) |
f1-micro |
0.2 |
0.60 |
4 (16 in Beta) |
3 |
g1-small |
0.5 |
1.70 |
4 (16 in Beta) |
3 |