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147e8a02e3
The game held 23.9 to 24.4 GB of commit in three sessions on an RTX 5090 at 3840x2160, flat over the session, on a machine whose commit stood at 66 of 73 GB with it. A machine that cannot give it that much pages, drops textures or loses the device, and its log said nothing about memory until then. mem_start_note reads the system's commit when a game starts and writes one warning line when what is free, plus what the process already holds, is below mem_need_mb (24576 by default, 0 for no warning). The menu has no place for a start-up notice (its only toasts are the co-op page's), so the line is in the log alone. tests/mem_need_check.py checks the rule and, through --probe-memneed, the answer and the warning line with the machine's own commit. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
26 lines
1.6 KiB
C
26 lines
1.6 KiB
C
// Whether the machine has the memory the game needs, asked once at the start (memory.c mem_start_note). Own header so
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// tests/mem_need_check.c checks it alone.
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//
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// What counts is commit: memory the system has promised to programs, out of RAM plus page file (on Linux the tightest
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// of the limits platform.h plat_commit_info reads). An allocation fails when the commit in use reaches the limit,
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// however much RAM is free, and on Windows the video driver charges the game's video memory to it too. Measured in
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// play (RTX 5090, 3840x2160, three sessions of 19,000 to 50,000 frames on 2026-11-11): this process held 23,910 to
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// 24,429 MB of commit, flat over the session, and the system stood at 65,777 to 65,914 of 73,154 MB with the other
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// programs' 41,500 MB. A machine that cannot give the game that much pages, drops textures to make room (vk_texture.c
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// commit_is_low) or loses the device.
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#pragma once
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// NX2NAVI_MEM_NEED_MB's default: the commit the game took in the sessions above, as 24 GiB.
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#define MEM_NEED_DEFAULT_MB 24576.0
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// The commit in MB the game can still get: what is free, and what this process already holds of its need.
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static inline double mem_need_room(double proc_mb, double used_mb, double limit_mb) {
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return limit_mb - used_mb + (proc_mb > 0 ? proc_mb : 0);
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}
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// 1 when the game's need does not fit. need_mb 0 or less: not asked. A limit below 0 is an unknown one: not short.
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static inline int mem_need_short(double proc_mb, double used_mb, double limit_mb, double need_mb) {
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if (need_mb <= 0 || limit_mb < 0) return 0;
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return mem_need_room(proc_mb, used_mb, limit_mb) < need_mb;
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}
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