RocksDB issued more than 500 million storage system calls, most of which were pread64 system calls (91%).
Besides the pread64 system call, RocksDB also issued write, close, openat, and read system calls.
Moreover, the RocksDB application spawned 2 processes and 33 threads, and accessed more than 15,000 different file paths.

The majority of system calls issued by RocksDB were data-related (99.98%).

RocksDB issued more than 450 million storage system calls to regular files, most of which were pread64 system calls.

The system call with the highest average execution time was pread64, which took 0,27 milliseconds on average.
The openat system call was the second most expensive system call, with an average execution time of 0,18 milliseconds.
The average execution time of the write system call was 0,05 milliseconds.

The threads belonging to the db_bench process issued more than 15,000 file accesses.
Each background thread (rocksdb:high0 and rocksdb:lowX) issued about 5,000 file accesses.

The threads belonging to the db_bench process issued more than 90% of the requests to the top 25 files.
Morevoer, different files were accessed by different compaction threads (rocksdb:lowX).

RocksDB accesses a large number of distinct file paths over time.
The most accessed files over time are .sst files, which are the RocksDB database files.

When multiple background threads (rocksdb:high0 and rocksdb:lowX) submit I/O requests, the number of system calls of db_bench threads descreases.
On the other hand, when fewer background threads execute simultaneosly, the performance of db_bench threads improves.