company-desktop
56c89c5fa4
diag: 拆分"写临时文件"与"acisIn"计时,判定内存读取不值得做
修完回写后开图期仍有 1733 次临时文件写入,需要判断"改内存读取"能省多少。
在 RegionAcisInDwgInFields 与 CoreTools::StringToRegion 两个重载里,把
"写临时文件+关闭"和"AcDbBody::acisIn"拆成独立计时(RegIn.write / RegIn.acisIn /
Str2Reg.write / Str2Reg.acisIn)。
实测(big1.dwg,93 s 开图,1733 次未命中):
RegIn.write 374 次 70.5 ms 189 us
RegIn.acisIn 374 次 1422.0 ms 3.80 ms
Str2Reg.write 1359 次 267.7 ms 197 us
Str2Reg.acisIn 1359 次 5999.5 ms 4.41 ms
结论:写文件合计 338 ms,只占 9.6 s 恢复耗时的 3.5%;杀软扫描已在 write 的 190 us 里
(Defender 在关闭时扫)。即使完全省掉文件往返,上限也只有 0.3~0.5 s(开图的 0.4%)。
而 AcDbBody::acisIn 在 R19~R26 只有文件名重载,真要内存解析只能改存盘格式走
acdbModelerRestoreEntityFromDwgFiler(即暂缓的 Phase 3)。因此不做。
剩余 7.4 s 是纯解析(1733 次 × 4.3 ms),只能靠减少次数;text 通道 1560 个唯一文本
是真实不同的截面,命中率已接近上限。继续提速应转向 Parasolid 绘制那条线。
数据与结论已写入 pipe-section-region-performance-plan.md。
本次只加诊断计时(Debug + AEC_PERF_COUNTER=1 才生效),不改任何业务行为。
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