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vere: increase LMDB mapsize to 1TB on macOS, linux

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Many ships have been observed bumping up against the existing mapsize
limits.  This results in a Vere crash via LMDB, which necessitates
compiling a new binary with a higher mapsize if one wants to relaunch.

There doesn't seem to be any serious penalty to setting this
somewhere in the terabyte range, though. [1]  In cases where the mapsize
exceeds the size of the disk, I infer from the LMDB docs that the
database may simply be permitted to grow until it runs up against the
disk limitations, which feels acceptable.

I've tested this on macOS and Linux and the binary runs without issue,
despite the mapsize being set far in excess of the disks I'm running on.

[1]: https://lmdb.readthedocs.io/en/release/
This commit is contained in:
Jared Tobin 2020-06-13 10:08:12 +04:00
parent 9241ab2ef5
commit 6e0cd4ef1a
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1 changed files with 5 additions and 8 deletions
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13
pkg/urbit/vere/lmdb.c
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@ -41,15 +41,12 @@ MDB_env* u3_lmdb_init(const char* log_path)
return 0;
}
// TODO: Start with forty gigabytes on macOS and sixty otherwise for the
// maximum event log size. We'll need to do something more sophisticated for
// real in the long term, though.
// Arbitrarily choosing 1TB as a "large enough" mapsize per the LMDB docs:
//
#ifdef U3_OS_osx
const size_t lmdb_mapsize = 42949672960;
#else
const size_t lmdb_mapsize = 64424509440;;
#endif
// "[..] on 64-bit there is no penalty for making this huge (say 1TB)."
//
const size_t lmdb_mapsize = 1099511627776;
ret_w = mdb_env_set_mapsize(env, lmdb_mapsize);
if (ret_w != 0) {
u3l_log("lmdb: failed to set database size: %s\n", mdb_strerror(ret_w));