Apply some RocksDB documentation suggestions to reduce memory usage.

[ahamlat]

Apply some RocksDB documentation suggestions to reduce memory usage.

• Set format_version to 5
• set optimize_filters_for_memory to true
• Increase block size to 32K
• set cache_index_and_filter_blocks to true

There is almost 1,5 GiB difference in memory consumption between this version and version 22.4.2 on a 16 GB RAM VM after 1 day of syncing (the green line represents the metrics of this PR).

Sync time is equivalent between the two versions.

Disk usage, CPU consumption and the number of open file descriptors is quite similar for tho instances.

Signed-off-by: Ameziane H ameziane.hamlat@consensys.net

PR description

Fixed Issue(s)

Documentation

• I thought about documentation and added the doc-change-required label to this PR if
  updates are required.

Changelog

• I thought about the changelog and included a changelog update if required.

[garyschulte]

🚢