postgres needs sync_file_range

[woody01]

Hello. I'm trying banchmark docker postgres with gvisor by using pgbench. I execute the following commands:

docker pull postgres
docker run --runtime=runsc -p 5000:5432 postgres

then start benchmark:

pgbench -i -p 5000 -U postgres -h localhost -d postgres # (invokes initialization mode)
pgbench -p 5000 -U postgres -h localhost -d postgres # (default test, 1 client, 10 transactions)

this test completes successfully, but if I increase the number of transactions and clients:

pgbench -c 2 -t 500 -p 5000 -U postgres -h localhost -d postgres  # (2 clients and 500 transactions)

test hangs (just stop), apparently waiting for a response from the database.
postgres spam message: WARNING: could not flush dirty data: Function not implemented
Attach logs and docker info
runsc.log.20180709-154037.490428.create.log
runsc.log.20180709-154037.494581.gofer.log
runsc.log.20180709-154037.507678.state.log
runsc.log.20180709-154037.512384.start.log
runsc.log.20180709-154037.652205.state.log
docker_info.txt

$ uname -a
Linux test_host 4.15.0-24-generic #26~16.04.1-Ubuntu SMP Fri Jun 15 14:35:08 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

postgres docker without using gvisor easy completes this test. Any idea what might be wrong?
Thanks in advance

[fvoznika]

Thanks for the detailed report, Postgres is calling sync_file_range which is not implemented yet.

[fvoznika]

Resolved by 2ef122d