On Tue, Feb 13, 2018 at 2:41 AM, Matt Ackeret <matt...@apple.com> wrote:
> On Sun, 11 Feb 2018, Zhigang Song wrote:
>>Will vim copy all file content to memory when I open a file?
> No, that's why vim is fast opening gigantic files.

However, unlike sed, Vim is not a stream editor (i.e. an editor which
processes the file in sequence from beginning to end, writing the
output at the same time). Vim edits its file(s) in whatever sequence
the user moves the cursor, writes it only for :w :x or similar, and
for that it "prefers" to hold the whole file in memory, and it will do
so as long as each buffer is small in comparison to 'maxmem' and all
buffers combined in comparison to 'maxmemtot'. On my 64-bit system,
Vim sets both these options by default to 4021798 (a little under 4
GiB which would be 4194304 KiB, and exactly half the value on the
MemTotal line of /proc/meminfo). It doesn't use all that in practice
though: my big memory-gobbler is the browser, which I have to restart
every few days to reclaim some RAM.

Best regards,

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