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Diffstat (limited to 'results/scraper/box64/2511')
| -rw-r--r-- | results/scraper/box64/2511 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/results/scraper/box64/2511 b/results/scraper/box64/2511 new file mode 100644 index 000000000..e085fefc2 --- /dev/null +++ b/results/scraper/box64/2511 @@ -0,0 +1,55 @@ +Clarification on the Usage and Purpose of the `dynamap` Red-Black Tree in Box64 +While examining Box64's memory management system, particularly the usage of `rbtree`, I observed unusual behavior involving the `dynamap` tree. By running Box64 combined with Wine64 on a Windows 64-bit chess game, I noticed that the `dynamap` tree significantly outnumbers other trees in node count. However, despite the high node usage, nodes from `dynamap` were rarely (if ever) actively accessed during execution (`rb_get`, `rb_get_64`, `rb_get_end`, `rb_get_end_64`, `rb_get_right` or `rb_get_left` calls). + + + +Additionally, I collected detailed statistics on node creation and usage: +A total of 54,306 rbtree nodes were created during execution. +Only 17,886 nodes were released before the process terminated. + +Among the released nodes, the breakdown of unused nodes (i.e., created but never accessed) is as follows: +1. `blockstree`: 0 unused nodes +2. `db_sizes`: 52 unused nodes +3. `dynamap`: 16,697 unused nodes (100% of released `dynamap` nodes were unused) +4. `envmap`: 1 unused node +5. `mapallmem`: 158 unused nodes +6. `mapmem`: 105 unused nodes +7. `memprot`: 873 unused nodes +8. `rbt_dynmem`: 0 unused nodes + +To further verify this observation, I experimentally disabled the usage of dynamap within the Box64 codebase and repeated my tests. Surprisingly, the system functioned perfectly without noticeable issues. +```c +int rb_set_64(rbtree_t *tree, uintptr_t start, uintptr_t end, uint64_t data) { + if(!strcmp(“dynamap”, tree->name)) + return 0; + //--skip--// +} +``` + + + +Given these observations, I seek clarification on the following points: + +1. **Intended Purpose**: What was the initial purpose behind implementing the `dynamap` tree within Box64's memory management system? + +2. **Node Utilization**: Why does `dynamap` contain so many nodes if these nodes are rarely (or never) accessed during regular operations? + +3. **Impact of Removal**: Considering that disabling `dynamap` had no observable negative impact in my tests, could removing or optimizing `dynamap` improve memory efficiency or overall performance? + + +Experimental Environment: +1. Box64 Version: v0.3.5 d3d3fa25 on apr 7 +2. Wine64 Version: wine-9.22 +3. Host System: Raspberry Pi 400 running `Linux Debian 6.12.3-arm64 #1 SMP Debian 6.12.3-1 (2024-12-07) aarch64 GNU/Linux` +4. Game Tested: [chess](https://win7games.com/) +5. Build Configuration: +```shell +cmake \ + -G Ninja \ + -D RPI4ARM64=1 -D ARM_DYNAREC=ON \ + -D CMAKE_BUILD_TYPE=RelWithDebInfo \ + -D CMAKE_C_COMPILER=aarch64-none-linux-gnu-gcc \ + .. +ninja +``` + |