This adds MmapFlags to DB.Options in case we need syscall.MAP_POPULATE
flag in Linux 2.6.23+ to do the sequential read-ahead, as discussed in [1].
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[1]: https://github.com/coreos/etcd/issues/3786
Only grow the database size when the high watermark increases.
We also grows the database size a little bit aggressively to
save a few ftruncates.
I have tested this on various environments. The performance impact
is ignorable with 16MB over allocation. Without over allocation,
the performance might decrease 100% when each Tx.Commit needs a new
page on a very slow disk (seek time dominates the total write).
This commit advises the mmapped data file to use MADV_RANDOM to avoid
readahead. This can provide a performance boost to Bolt databases that
are larger than memory by avoiding unnecessary disk i/o.
This commit adds the DB.NoGrowSync flag to optionally revert mmap()
calls to how they were implemented before the ext3/ext4 fix. When
NoGrowSync is true, remapping the data file will not force the file
system to resize it immediately. This works for non-ext3/4 file
systems.
The default value of NoGrowSync is false so it is still safe for
ext3/ext4 file systems by default.
See also: https://github.com/boltdb/bolt/issues/284
This commit fixes an issue with ext3/ext4 filesystems where metadata file size is not synced
when resizing a file. It also resizes the entire resize instead of updating the size during
individual page writes.
Thanks to @tv42 for the fix.
Rather than having the build setup such that it will only work on the
specifically defined operating systems, this commit modifies it to use
more liberal !windows,!plan9 build tag for the unix specific bits.
This means bolt will compile on more Operating Systems such as OpenBSD,
FreeBSD, and NetBSD.
See boltdb/bolt#257 for discussion.
This commit changes Open() to provide an additional Options argument. The options
argument currently only has a Timeout which will cause the Open() to return
ErrTimeout if a file lock cannot be obtained in time.
Fixes#207.
Ben Johnson
Gyu-Ho Lee
Xiang Li
Ken Sedgwick
sasha-s
Dave Collins