Hello, We are using BerkeleyDB since a decade - but we are searching for something more lightweight. LMDB is what we are looking for ... ^^ The small code and the benchmark-results are very impressive! A question: We have a server with 4 GB RAM. One of the BerkeleyDB-files has about 20 GB.This particular database is a kind of archive - hardly read and hardly written (maybe once per minute). Is it possible to "mmap()" a 20 GB database into the RAM?

If yes, will the server start "swapping"?

Thanks a lot Markus

>>> Howard Chu <hyc(a)symas.com&gt; schrieb am 25.01.2014 um 19:07 in Nachricht <52E3FD6E.9070906(a)symas.com&gt;: > Markus Doppelbauer wrote: >> Hello, >> We are using BerkeleyDB since a decade - but we are searching for something >> more lightweight. LMDB is what we are looking for ... ^^ >> The small code and the benchmark-results are very impressive! >> A question: We have a server with 4 GB RAM. One of the BerkeleyDB-files has >> about 20 GB.This particular database is a kind of archive - hardly read and > hardly >> written (maybe once per minute). >> Is it possible to "mmap()" a 20 GB database into the RAM? > > Yes. > >> If yes, will the server >> start "swapping"? > > No. This is only true (AFAIK)

if the applications uses huge pages or memory

In general mmap files "swap" onto themselves, and you would not call it

Ulrich

>>> "Markus Doppelbauer" <doppelbauer(a)gmx.net&gt; schrieb am 25.01.2014 um >>> 16:04 in Nachricht <trinity-2ed9e021-7691-4933-90cc-5ecf9e3509d0-1390662285748@3capp-gmx-bs0 7>: > Hello, > > We are using BerkeleyDB since a decade - but we are searching for > something more lightweight. LMDB is what we are looking for ... ^^ ??? More lightweight? Last time I used Sleepycat DB, the extra size for the binary was about 1MB...