Hamsterdb as local cache

[BigJoe RawenGroup]

Hi all

Have any user experience with high hamsterdb load?

The local db around 50-100gb.
Read load around 50.000-120.000 per sec, and write around 20.000.
I dont using transactions but using recovery.
Inmem cache aroung 1gb.

Regards Joe

[Christoph Rupp]

Hi Joe,

those numbers are your requirement? You can simulate that load quite easily with ham_bench (tools/ham_bench).

First create a database. You did not describe your keys and your records; the default key size is 16, the default record size is 1024. You can change that (including the key type) as described here: https://github.com/cruppstahl/hamsterdb/wiki/Evaluating-and-Benchmarking

this inserts 50 GBs:
./ham_bench --stop-bytes=5000000000 --use-recovery --cache=1000000000

now say you want to open that file and perform 1 mio additional read/write operations, 50% read and 50% write:

./ham_bench --open --use-recovery --find-pct=50 --cache=1000000000

On my machine (a commodity system, but with an SSD) loading the database has on avg 65k ops/sec.

The second command has 260k inserts/sec and 100k find/sec.

Best regards
Christoph

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