undefined | Better HN

0 pointshyc_symas2y ago0 comments

> Do you have benchmarks of lmdb when the working set is much larger than memory? I couldn't find any.

Where did you look? This is a sample using DB 5x and 50x larger than RAM http://www.lmdb.tech/bench/hyperdex/

There are plenty of other larger-than-RAM benchmarks there.

0 comments

Hm. That seems to be comparing against a 2013 era leveldb, which at the time also used mmap. (It's since switched the default for performance reasons)

It's also strange to me that there's no transition in performance when the data set size grows beyond cache.

j / k navigate · click thread line to collapse

0 pointshyc_symas2y ago0 comments

> Do you have benchmarks of lmdb when the working set is much larger than memory? I couldn't find any.

Where did you look? This is a sample using DB 5x and 50x larger than RAM http://www.lmdb.tech/bench/hyperdex/

There are plenty of other larger-than-RAM benchmarks there.

0 comments

ori_b2y ago

Hm. That seems to be comparing against a 2013 era leveldb, which at the time also used mmap. (It's since switched the default for performance reasons)

It's also strange to me that there's no transition in performance when the data set size grows beyond cache.

j / k navigate · click thread line to collapse