How to accelerate `make prog` run time

[Siris-Li]

When first run make prog, it will take a long time (about 6~7 mins) to finish synthesis, place&route, etc. I find out that during this process, only one CPU core is used, leaving other 7 cores idle. My question is can we add some parameters to let all CPUs run during make prog?
My working environment is VM Ubuntu 18.04, 10G RAM, 8 CPU cores.

[tcal-x]

Hi @limingxuan-pku , unfortunately there is no easy way to parallelize that I know of. To the best of my knowledge, the F4PGA / Symbiflow tools are all single-threaded. @mithro , is that correct?