Commit 49f826b1 authored by Kirill Smelkov's avatar Kirill Smelkov

wendelin.core v2.0.alpha1

parent ff8bd199
Wendelin.core change history
============================
2.0.alpha1 (2021-11-16)
-----------------------
This is a major pre-release that reduces wendelin.core RAM consumption
dramatically:
The project switches to be mainly using kernel virtual memory manager.
Bigfiles are now primarily accessed with plain OS-level mmap to files from
synthetic WCFS filesystem. This makes bigfile's cache (now it is the kernel's
pagecache) to be shared in between several processes.
In addition a custom coherency protocol is provided, which allows clients,
that want to receive isolation guarantee ("I" from ACID), to still use the shared
cache and at the same time get bigfile view isolated from other's changes.
By default wendelin.core python client continues to provide full ACID semantics as
before.
In addition to being significantly more efficient, WCFS also fixes
data-corruption bugs that were discovered__ in how Wendelin.core 1 handles
invalidations on BTree topology change.
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/8c32c9f6
Please see wcfs.go__ for description of the new filesystem.
__ https://lab.nexedi.com/nexedi/wendelin.core/blob/master/wcfs/wcfs.go
Major steps: 1__, 2__, 3__, 4__, 5__, 6__, 7__, 8__, 9__, 10__, 11__, 12__,
13__, 14__, 15__, 16__, 17__, 18__, 19__, 20__, 21__.
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/2c152d41?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/e3f2ee2d?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/0e829874?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/a8595565?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/b87edcfe?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/1f2cd49d?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/27df5a3b?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/80153aa5?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/2ab4be93?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/f980471f?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/4430de41?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/6f0cdaff?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/10f7153a?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/fae045cc?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/23362204?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/ceadfcc7?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/1dba3a9a?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/1f866c00?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/e11edc70?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/986cf86e?expanded=1
__ https://lab.nexedi.com/nexedi/wendelin.core/commit/c5e18c74?expanded=1
0.13 (2019-06-18)
-----------------
......
......@@ -81,13 +81,17 @@ limitations and things that need to be improved:
Thus
- we are currently working on improved wendelin.core design and implementation,
which will use kernel virtual memory manager (instead of one implemented__ in__
which uses kernel virtual memory manager (complemented by one implemented__ in__
userspace__) with arrays backend presented to kernel via FUSE as virtual
filesystem implemented in Go.
As of 2021 November `this filesystem`__ reached its alpha state and is staged
to be tried for real.
__ https://lab.nexedi.com/nexedi/wendelin.core/blob/master/include/wendelin/bigfile/virtmem.h
__ https://lab.nexedi.com/nexedi/wendelin.core/blob/master/bigfile/virtmem.c
__ https://lab.nexedi.com/nexedi/wendelin.core/blob/master/bigfile/pagefault.c
__ https://lab.nexedi.com/nexedi/wendelin.core/blob/master/wcfs/wcfs.go
In parallel we will also:
......
......@@ -290,7 +290,7 @@ libwcfs_h = [
setup(
name = 'wendelin.core',
version = '0.13',
version = '2.0.alpha1',
description = 'Out-of-core NumPy arrays',
long_description = '%s\n----\n\n%s' % (
readfile('README.rst'), readfile('CHANGELOG.rst')),
......
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