- Is use of the ARC cache algorithm still risky in Open Source due to the IBM patent? #lazytwitter #patents #ip
I think that both ZFS and Postgres have variants of ARC that are believed to be non-infringing.
AFAIK, yes, still potentially a risk. In our experiments (Postgres), ARC is only a marginal win over other techniques
Plus it requires a global lock over the buffer pool, so a modified clock-based scheme was actually more scalable