Commit Graph

13 Commits

Author SHA1 Message Date
Michael Eischer 19afad8a09 restore: support sparse restores also on windows 2022-09-24 21:39:39 +02:00
Michael Eischer a5ebd5de4b restorer: Fix race condition in partialFile.WriteAt
The restorer can issue multiple calls to WriteAt in parallel. This can
result in unexpected orderings of the Truncate and WriteAt calls and
sometimes too short restored files.
2022-09-24 21:39:39 +02:00
Michael Eischer 5b6a77058a Enable sparseness only conditionally
We can either preallocate storage for a file or sparsify it. This
detects a pack file as sparse if it contains an all zero block or
consists of only one block. As the file sparsification is just an
approximation, hide it behind a `--sparse` parameter.
2022-09-24 21:20:00 +02:00
greatroar 5d4568d393 Write sparse files in restorer
This writes files by using (*os.File).Truncate, which resolves to the
truncate system call on Unix.

Compared to the naive loop,

	for _, b := range p {
		if b != 0 {
			return false
		}
	}

the optimized allZero is about 10× faster:

name       old time/op    new time/op     delta
AllZero-8    1.09ms ± 1%     0.09ms ± 1%    -92.10%  (p=0.000 n=10+10)

name       old speed      new speed       delta
AllZero-8  3.84GB/s ± 1%  48.59GB/s ± 1%  +1166.51%  (p=0.000 n=10+10)
2022-09-24 21:18:48 +02:00
Michael Eischer f414db987d gofmt all files
Apparently the rules for comment formatting have changed with go 1.19.
2022-08-19 19:12:26 +02:00
Alexander Neumann 0858fbf6aa Add more error handling 2021-01-30 20:19:47 +01:00
greatroar 1e1a1f3078 Upgrade cespare/xxhash to 2.1.1 2020-10-05 17:25:39 +02:00
Michael Eischer 8cc9514879 restorer: pre-allocate files before loading chunks 2020-09-07 21:41:47 +02:00
Igor Fedorenko f17ffa0283 restorer: Allow writing target file blobs out of order
Much simpler implementation that guarantees each required pack
is downloaded only once (and hence does not need to manage
pack cache). Also improves large file restore performance.

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
2020-02-26 16:14:45 +01:00
Igor Fedorenko bf9a507148 Fix rare 'file already closed' during restore
Fixes #2183

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
2019-03-16 17:01:20 +01:00
Igor Fedorenko 9f3ca97ee8 restore: Chang fileInfo to use snapshot location instead of target path
* uses less memory as common prefix is only stored once
* stepping stone for simpler error callback api, which
  will allow further memory footprint reduction

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
2018-10-14 17:39:42 +02:00
Igor Fedorenko e010f3b884 restore: Fix small memory leak in filesWriter, add tests
Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
2018-10-14 17:39:42 +02:00
Igor Fedorenko 1869930d95 restore: New optimized multithreaded implementation
Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
2018-10-14 17:37:30 +02:00