Hi,
On 2018-05-22 17:37:28 +0200, Dmitry Dolgov wrote: > Thanks for the patch. Out of curiosity I tried to play with it a bit. Thanks. > `pgbench -i -s 100` actually hang on my machine, because the > copy process ended up with waiting after `pg_uds_send_with_fd` > had Hm, that had worked at some point... > errno == EWOULDBLOCK || errno == EAGAIN > > as well as the checkpointer process. What do you mean with that latest sentence? > Looks like with the default > configuration and `max_wal_size=1GB` it writes more than reads to a > socket, and a buffer eventually becomes full. That's intended to then wake up the checkpointer immediately, so it can absorb the requests. So something isn't right yet. > I've increased SO_RCVBUF/SO_SNDBUF and `max_wal_size` independently to > check it, and in both cases the problem disappeared (but I assume only > for this particular scale). Is it something that was already > considered? It's considered. Tuning up those might help with performance, but shouldn't required from a correctness POV. Hm. Greetings, Andres Freund
