After this change we never release blocks from memory (in practice it
never happened because the memory limits are never reached). Let the OS
take care of that.
---
On today's systems the 'maxmem' and 'maxmemtot' values are huge (4+ GB)
so the limits are never reached in practice, but Vim wastes a lot of
time checking if the limit was reached.
If the limit is reached Vim starts saving pieces of the swap file that were in
memory to the disk. Said in a different way: Vim implements its own
memory-paging mechanism. This is unnecessary and inefficient since the
operating system already has virtual memory and will swap to the disk if
programs start using too much memory.
This change does...
1. Reduce the number of config options and need for documentation.
2. Make the code more efficient as we don't have to keep track of memory
usage nor check if the memory limits were reached to start swapping
to disk every time we need memory for buffers.
3. Simplify the code. Once memfile.c is simple enough it could be
replaced by actual operating system memory mapping (mmap,
MemoryViewOfFile...). This change does not prevent Vim to recover
changes from swap files since the swapping code is never triggered
with the huge limits set by default.
> The option 'maxmem' ('mm') is used to set the maximum memory used for one
> buffer (in kilobytes). 'maxmemtot' is used to set the maximum memory used for
> all buffers (in kilobytes). The defaults depend on the system used. These
> are not hard limits, but tell Vim when to move text into a swap file. If you
> don't like Vim to swap to a file, set 'maxmem' and 'maxmemtot' to a very large
> value. The swap file will then only be used for recovery. If you don't want
> a swap file at all, set 'updatecount' to 0, or use the "-n" argument when
> starting Vim.
On today's systems these values are huge (4GB in my machine with 8GB of RAM
since it's set as half the available memory by default) so the limits are
never reached in practice, but Vim wastes a lot of time checking if the limit
was reached.
If the limit is reached Vim starts saving pieces of the swap file that were in
memory to the disk. Said in a different way: Vim implements its own memory
swapping mechanism. This is unnecessary and inefficient since the operating
system already virtualized the memory and will swap to the disk if programs
start using too much memory.
This change does...
1. Reduce the number of config options and need for documentation.
2. Make the code more efficient as we don't have to keep track of memory usage
nor check if the memory limits were reached to start swapping to disk every
time we need memory for buffers.
3. Simplify the code. Once `memfile.c` is simple enough it could be replaced by
actual operating system memory mapping (`mmap`, `MemoryViewOfFile`...).
This change does not prevent Vim to recover changes from swap files since the
swapping code is never triggered with the huge limits set by default.
Note about ~/.local/share/nvim/site used in one usr_\* file: this one talks
about user-local installation of third-party plugins, and
~/.local/share/nvim/site is the proper place for them. Most other files talk
about user own configuration and this is ~/.config.
This removes all instances of '{not in Vi}', '{Vi: ... }', etc.
We don't care about Vi compatibility, so all of these annotations are
useless in nvim. This also removed the syntax definitions for these
items.
In addition, remove instances of '{only when compiled with +feature}'
adjacent to instances of '{not in Vi}' and friends.
Helped-by: David Bürgin <676c7473@gmail.com>
Helped-by: Felipe Morales <hel.sheep@gmail.com>
closes#2535
Notes regarding the removal of specific items:
- Aztec C: only on the Amiga.
- mch_check_win(): doesn't exist anymore.
- Comment in ex_cmds.c: It seems the context for this comment was
removed, but the comment was inadvertantly left alone.
Closes https://github.com/neovim/docs/pull/26
Also added stubs for 'cryptmethod' and 'key', and placeholders for
explanation regarding removal of crypto functionality.
Vim runtime files based on 7.4.384 / hg changeset 7090d7f160f7
Excluding:
Amiga icons (*.info, icons/)
doc/hangulin.txt
tutor/
spell/
lang/ (only used for menu translations)
macros/maze/, macros/hanoi/, macros/life/, macros/urm/
These were used to test vi compatibility.
termcap
"Demonstration of a termcap file (for the Amiga and Archimedes)"
Helped-by: Rich Wareham <rjw57@cam.ac.uk>
Helped-by: John <john.schmidt.h@gmail.com>
Helped-by: Yann <yann@yann-salaun.com>
Helped-by: Christophe Badoit <c.badoit@lesiteimmo.com>
Helped-by: drasill <github@tof2k.com>
Helped-by: Tae Sandoval Murgan <taecilla@gmail.com>
Helped-by: Lowe Thiderman <lowe.thiderman@gmail.com>
