I wonder if your bird (or other program) is leaking memory. Here's my bird receiving v4 and v6 near-full table and doing some filtering:

bird> show route table global_v4 count
806364 of 806364 routes for 806364 networks in table global_v4
bird> show route table global_v6 count
89509 of 89509 routes for 89509 networks in table global_v6

This is a 1G RAM VPS, bird virtual memory usage is <400M.

# free -wh
              total        used        free      shared     buffers       cache   available
Mem:          987Mi       612Mi       181Mi        11Mi        36Mi       156Mi       226Mi
Swap:         4.0Gi       190Mi       3.8Gi

On Mon, Sep 7, 2020, at 08:45, Mehdi Rukmawan wrote:
> Hello,
>
> Is anyone here know, how much RAM needed for BIRD to receive all full
> routes Internet table?
>
> My bird consumes around 20G of RAM for just 1 full routes 800k
>
>                       total        used        free      shared 
> buff/cache   available
> Mem:            31G         20G        9.4G        1.2M        1.6G     
>     27G
>
> Is this as expected ? or we can fine-tuning Bird ?