21 Jan
2020
21 Jan
'20
4:36 a.m.
Hi,
Our application uses LMDB and sometimes we need to perform scan of old ("cold") data. The problem here is that this data can/will remove "hot" data from page-cache.
Ideally to prevent this from happening we'd like to somehow mark cursor as "streaming"/"non-temporal". But AFAICS there is no such feature currently.
We're experimenting with marking pages returned by cursor with madvise(MADV_DONTNEED) and this at least prevents RSS from growing. But maybe there are some downsides of this approach?
Thanks!
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