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* Quadruple the Berkeley DB locking limits to get rid of out of memory

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errors while running `nix-store --verify'.
This commit is contained in:
Eelco Dolstra 2004-08-31 10:50:08 +00:00
parent fe122c5a15
commit c25f2883b1
1 changed files with 21 additions and 2 deletions
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21
src/libstore/db.cc
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@ -165,11 +165,30 @@ void Database::open(const string & path)
DbEnv * env = 0; /* !!! close on error */ DbEnv * env = 0; /* !!! close on error */
env = new DbEnv(0); env = new DbEnv(0);
/* Smaller log files. */
env->set_lg_bsize(32 * 1024); /* default */ env->set_lg_bsize(32 * 1024); /* default */
env->set_lg_max(256 * 1024); /* must be > 4 * lg_bsize */ env->set_lg_max(256 * 1024); /* must be > 4 * lg_bsize */
env->set_lk_detect(DB_LOCK_DEFAULT);
/* Write the log, but don't sync. This protects transactions
against application crashes, but if the system crashes,
some transactions may be undone. An acceptable risk, I
think. */
env->set_flags(DB_TXN_WRITE_NOSYNC | DB_LOG_AUTOREMOVE, 1); env->set_flags(DB_TXN_WRITE_NOSYNC | DB_LOG_AUTOREMOVE, 1);
/* Increase the locking limits. If you ever get `Dbc::get:
Cannot allocate memory' or similar, especially while
running `nix-store --verify', just increase the following
number, then run db_recover on the database to remove the
existing DB environment (since changes only take effect on
new environments). */
env->set_lk_max_locks(4000);
env->set_lk_max_lockers(4000);
env->set_lk_max_objects(4000);
env->set_lk_detect(DB_LOCK_DEFAULT);
/* Dangerous, probably, but from the docs it *seems* that BDB
shouldn't sync when DB_TXN_WRITE_NOSYNC is used, but it
still fsync()s sometimes. */
db_env_set_func_fsync(my_fsync); db_env_set_func_fsync(my_fsync);