As Thomas rightly pointed about the feasibility of benchmarking. You may still compare performance of queries on both Exadata as well as PostgreSQL. IMO, it may not be on par, but it must be acceptable.
In the contemporary world, 60TB isn't really a huge database. So, I hardly think you should find any performance issues on PostgreSQL.
We are planning to migrate Oracle exadata database to postgresql and db size ranges from 1 tb to 60 TB.
Will the PG support this with the performance matching to that of exadata applince?
If anyone could point me in the right direction where i xan get the benchmarking done for these two databases either on prime or any cloud would be great.