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Allow setting cache size based on memory percentage (#184) 

The problem:

1. For the most people imlib2's default 4MiB is unreasonably low;

2. Hardcoding cache size to ~256MiB has performance benefits and doesn't
   increase RAM usage too much on relatively modern systems;

3. But we can't do that, because that would be detrimental to low spec systems
   that (apparently) not (?) building nsxiv from source, as been discussed
   #171

Solution:

Calculate cache size based on total memory.

Default is set as 3%, which means:
* ~245MiB for 8GiB
* ~30MiB for 1GiB
* and so on

CACHE_SIZE_LIMIT (256MiB by default) sets the highest possible value. And in
case we cannot determine the total memory (e.g since _SC_PHYS_PAGES isn't
POSIX) use CACHE_SIZE_FALLBACK (32MiB by default) instead.

Co-authored-by: NRK <nrk@disroot.org>
This commit is contained in:
MahouShoujoMivutilde 2022-01-01 11:55:59 +03:00 committed by GitHub
parent 1a691d42f6
commit e777adf985
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 26 additions and 5 deletions
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11
config.def.h
View File

@ -62,11 +62,14 @@ static const bool ANTI_ALIAS = true;
*/
static const bool ALPHA_LAYER = false;
/* cache size for imlib2, in bytes. For backwards compatibility reasons, the
* size is kept at 4MiB. For most users, it is advised to pick a value close to
* or above 128MiB for better image (re)loading performance.
/* percentage of memory to use for imlib2's cache size.
* 3 means use 3% of total memory which is about 245MiB on 8GiB machine.
* 0 or less means disable cache.
* 100 means use all available memory (but not above CACHE_SIZE_LIMIT).
*/
static const int CACHE_SIZE = 4 * 1024 * 1024; /* 4MiB */
static const int CACHE_SIZE_MEM_PERCENTAGE = 3; /* use 3% of total memory for cache */
static const int CACHE_SIZE_LIMIT = 256 * 1024 * 1024; /* but not above 256MiB */
static const int CACHE_SIZE_FALLBACK = 32 * 1024 * 1024; /* fallback to 32MiB if we can't determine total memory */
#endif
#ifdef _THUMBS_CONFIG

20
image.c
View File

@ -46,12 +46,30 @@ enum { DEF_WEBP_DELAY = 75 };
#define ZOOM_MIN (zoom_levels[0] / 100)
#define ZOOM_MAX (zoom_levels[ARRLEN(zoom_levels)-1] / 100)
static int calc_cache_size(void)
{
int cache;
long pages, page_size;
if (CACHE_SIZE_MEM_PERCENTAGE <= 0)
return 0;
pages = sysconf(_SC_PHYS_PAGES);
page_size = sysconf(_SC_PAGE_SIZE);
if (pages < 0 || page_size < 0)
return CACHE_SIZE_FALLBACK;
cache = (pages/100) * CACHE_SIZE_MEM_PERCENTAGE;
cache *= page_size;
return MIN(cache, CACHE_SIZE_LIMIT);
}
void img_init(img_t *img, win_t *win)
{
imlib_context_set_display(win->env.dpy);
imlib_context_set_visual(win->env.vis);
imlib_context_set_colormap(win->env.cmap);
imlib_set_cache_size(CACHE_SIZE);
imlib_set_cache_size(calc_cache_size());
img->im = NULL;
img->win = win;