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