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ircd::db: Improve fd limit range in db opts.

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This commit is contained in:
Jason Volk 2019-10-10 13:19:46 -07:00
parent 5c2ce1f20c
commit ec6c3bbc0f
1 changed files with 5 additions and 3 deletions
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8
ircd/db.cc
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@ -1091,9 +1091,11 @@ try
// MUST be 0 or std::threads are spawned in rocksdb.
opts->max_file_opening_threads = 0;
// TODO: We should hint rocksdb with a harder value so it doesn't
// potentially eat up all our fd's.
opts->max_open_files = ircd::info::rlimit_nofile / 2;
// limit maxfdto prevent too many small files degrading read perf; too low is
// bad for write perf.
opts->max_open_files = ircd::info::rlimit_nofile?
std::min(ircd::info::rlimit_nofile, 256UL): // limit when rlimit supported
256UL; // default when rlimit not supported.
// TODO: Check if these values can be increased; RocksDB may keep
// thread_local state preventing values > 1.