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Change min mmap size from 1MB to 32KB.

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This commit adjusts the minimum mmap size from 1MB to 32KB. The
previous limit was arbitrary and causes wasted space for very small
databases.

Thanks to @mcuadros for submitting the original pull request:

  https://github.com/boltdb/bolt/pull/351
This commit is contained in:
Ben Johnson 2015-05-18 10:37:47 -06:00
parent 75e094b84f
commit a450f843ee
1 changed files with 2 additions and 2 deletions
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4
db.go
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@ -256,8 +256,8 @@ func (db *DB) munmap() error {
// of the database. The minimum size is 1MB and doubles until it reaches 1GB.
// Returns an error if the new mmap size is greater than the max allowed.
func (db *DB) mmapSize(size int) (int, error) {
// Double the size from 1MB until 1GB.
for i := uint(20); i <= 30; i++ {
// Double the size from 32KB until 1GB.
for i := uint(15); i <= 30; i++ {
if size <= 1<<i {
return 1 << i, nil
}