Hi
I performed some load tests over an immudb database and I didn't get good scores, therefore I decided to ask for guidance related to the database settings / immudb service settings, in case of heavy load.

Testing environment:
test machine
CPU - Intel® Core™ i7-10750H CPU @ 2.60GHz × 12
MEM - 32,0 GiB
SSD disk
immudb (v 1.3.2) - docker container running locally, on test machine
immuclient (v 1.3.2) - used in a golang application running locally, on test machine

Test scenario is:
Step1 - create some entries (
- create client + open session
- prepare 10 key-values
- insert key-values using ExecAll (precondition key must not exist)
)
Step2 - update entries created in Step1 (
- create client + open session
- prepare new values for the 10 keys
- update keys using ExecAll (precondition key must exist))
)
Step3 - get entries created in Step2(
- create client + open session
- retrieve key-values using GetAll
)

Test Results:

• Serial running, 1 process that cycle (Step1 -> Step2 -> Step3) 1000 times.
  In this case the runtime is acceptable, example:
  - create client + open session = 50 - 62 milliseconds
  - ExecAll = 10 - 13 milliseconds
  - GetAll = 5 - 10 milliseconds

• Concurrent running, 100 process that cycle (Step1 -> Step2 -> Step3) 1000 times.
  In this case the runtime is not so good, example:
  - create client + open session = 600 - 800 milliseconds
  - ExecAll = 6500 - 9000 milliseconds
  - GetAll = 100 - 150 milliseconds

So, it is very clear that in a concurrent environment MY immudb doesn't respond as expected.

I had a look over your mentions and over your code :
https://github.com/codenotary/immudb#performance-figures
https://github.com/codenotary/immudb/tree/master/tools/testing/stress_tool_test_kv
https://github.com/codenotary/immudb-tools/tree/main/stresstest
and, it seems there are various database parameters/configs that could be changed in order to improve the performance:
maxConcurrency (30 <-> 100)
maxIOConcurrency (1 <-> 100)
indexSettings.cleanupPercentage (0.1 <-> 10)
.... so on
I have run tests with various database parameters values (many combinations) but, unfortunately, I didn't obtain any improvement.

Please, could you provide some guidance for database settings/configs in order to obtain a better performance (heavy inserts) ?
I am pretty sure, in my case, the indexing process should be configured with care too.

Thank you very much.