configure hyperleveldb not to use mmap

[Ramnatthan Ala]

Hi,

I was wondering if there is a way to configure hyperleveldb not to use mmap but only use read/write syscalls to read and write data out of the store. Is this possible in hyperdex (installed from apt-get on ubuntu)? Or is this possible when I can build from sources? Has someone tried this configuration? Any help would be appreciated very much. Thanks much!

--Ram

[Robert Escriva]

HyperLevelDB does not have this configuration option. If you're willing
to build a modified version of the sources, you can disable mmap reads
by editing "util/env_posix.cc" and changing the MmapLimiter class to not
allow any mmaped-reads.

-Robert

[Ramnatthan Ala]

Thanks for the quick response Robert! I will take a look at that. Is it possible also to change mmap'd writes to use write syscalls?

[Robert Escriva]

Not with HyperLevelDB. Much of the concurrency comes from avoiding
these syscalls. You could easily do this with other leveldb variants,
and it'll be the same result as you'd get with HyperLevelDB.

-Robert

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[Ramnatthan Ala]

Sure. Thank you!