Hello,
Sometimes user want to measure the server's IO performance during some troubleshooting *without* the access to postgresql server. Is there any good way to measure it in such sistuation? Measuring it with SELECT .. FROM t WHERE xxx, both shared_buffer in PG and file system buffer bothers. pg_read_binary_file is better, but file system cache still there. should we expose a direct-io option for pg_read_binary_file? -- Best Regards Andy Fan
