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ITS#7725 add nordahead envflag

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This commit is contained in:
Howard Chu 2013-10-12 16:25:33 -07:00
parent 1d81f01b13
commit 80d8c56afd
2 changed files with 10 additions and 1 deletions
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10
doc/man/man5/slapd-mdb.5
View File

@ -54,7 +54,7 @@ A separate directory must be specified for each database.
The default is
.BR LOCALSTATEDIR/openldap\-data .
.TP
\fBenvflags \fR{\fBnosync\fR,\fBnometasync\fR,\fBwritemap\fR,\fBmapasync\fR}
\fBenvflags \fR{\fBnosync\fR,\fBnometasync\fR,\fBwritemap\fR,\fBmapasync\fR,\fBnordahead\fR}
Specify flags for finer-grained control of the LMDB library's operation.
.RS
.TP
@ -94,6 +94,14 @@ has not been set. It also has no effect if
.I nosync
is set.
.RE
.RS
.TP
.B nordahead
Turn off file readahead. Usually the OS performs readahead on every read
request. This usually boosts read performance but can be harmful to
random access read performance if the system's memory is full and the DB
is larger than RAM. This option is not implemented on Windows.
.RE
.TP
\fBindex \fR{\fI<attrlist>\fR|\fBdefault\fR} [\fBpres\fR,\fBeq\fR,\fBapprox\fR,\fBsub\fR,\fI<special>\fR]

1
servers/slapd/back-mdb/config.c
View File

@ -104,6 +104,7 @@ static slap_verbmasks mdb_envflags[] = {
{ BER_BVC("nometasync"), MDB_NOMETASYNC },
{ BER_BVC("writemap"), MDB_WRITEMAP },
{ BER_BVC("mapasync"), MDB_MAPASYNC },
{ BER_BVC("nordahead"), MDB_NORDAHEAD },
{ BER_BVNULL, 0 }
};