How many connections can postgresql-9 handle?

Question

PostgreSQL

Hello
When testing through pgbench, I noticed that the maximum number of connections that can be installed during the test is 1000:

/usr/pgsql-9.6/bin/pgbench -p 5432 -h localhost -c 900 -C -T 60 -P 1 -U dbuser

If the application rests on the connections to the database, how, in addition to pgbouncer, can I increase the number of connections to the database?
So far I see several options:
1) Use slave instances of the base
2) Try hadoop (although I have a rather superficial idea about it and is there an api for golang for it)
3) Use NOsql
What can you advise from your experience?

Answer 1

And how many cores do you have on a piece of iron to run 1000 requests in parallel? Is there at least a hundred CPU cores for this, so that only a dozen processes fight and interfere with each other for each core?
If you want to reduce latency - save already open connections.
If you want to increase throughput - reduce the number of active processes.
Much better than both. So yes, pgbouncer. Or at least a reasonable pool on the application.