diag: 量 X3dPart 几何存盘的真实体积与序列化成本
问题：上一轮判定"3D 缓存存盘对管道不做"时，顺带给 X3dPart（Rebuild 占开图 18~22%）估了个"体积 +10~40 MB、存盘 +1.5~4 s"——这是估算，没有实测，结论可能 把这条路误杀了。本次补上测量。 改动：AecDbX3dPart::EnsureCreated 里加一个探针（AEC_X3D_SIZEPROBE=1 才生效， Release 零开销）：每个 part 重建后对它的 m_pSolid 做一次 AcDbBody::acisOut 到临时文件，记录 SAT 字节数与耗时，然后删文件；每 100 个 part 把汇总写 %TEMP%\aec_x3d_probe.txt。同时记录同一次 Rebuild 的耗时用于对比。 big1.dwg 实测（AutoCAD 2020 / R230 Debug，开图 95 s）： - 有几何的 part：1200（1248 个里 48 个 Hide/空，无 solid） - SAT 总字节 3.56 MB，平均 2968 B/part，最大 36086 B - acisOut 平均 0.799 ms/part；Rebuild 平均 15.3 ms/part（本次合计 20.4 s） - 重建 / 序列化 = 19.1 倍 据此（都取保守侧）： - DWG 体积增量 ≤ 3.4 MB（8.2 -> ~11.6 MB，+42%）——DWG 里存的是二进制 SAB， 通常比 SAT 文本更小； - 每次存盘多花 ≤ 0.96 s（1200 x 0.8 ms），且二进制写比转文本便宜、不落盘； - 开图预计省 15~18 s（重建 18~20 s，恢复按 acisOut 同量级估 1~2 s）。 结论修正：X3dPart 这条"几何存盘"是值得做的，之前的体积/耗时估算高估了 3~10 倍。 配套说明写进 3d-cache-dwg-verdict.md §7。
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@@ -20,6 +20,138 @@ static const Adesk::UInt16 kMagenta = 6;
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static const Adesk::UInt16 kWhite = 7;
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static const Adesk::UInt16 kColorByLayer = 256;
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// ===========================================================================
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// 试点探针（AEC_X3D_SIZEPROBE=1 才生效，Release 零开销）
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//
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// 目的：量清楚"把一个 part 的 m_pSolid 存进 DWG"到底要多大、多贵。
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// - acisOut 出来的 SAT 文本字节数：二进制 SAB 一般比它小，所以这是体积**上界**；
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// - acisOut 的耗时：二进制写只要格式化更少，所以这是"序列化一次"的耗时**上界**；
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// - 顺带对比同一次 Rebuild 的耗时，算出"恢复 vs 重建"的比值。
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// 汇总写 %TEMP%\aec_x3d_probe.txt（每 100 个 part 刷新一次）。
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// ===========================================================================
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namespace
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{
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struct X3dProbeStat
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{
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X3dProbeStat() : n(0), bytes(0), maxBytes(0), outUs(0), rebuildUs(0) {}
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long long n;
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long long bytes;
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long long maxBytes;
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long long outUs;
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long long rebuildUs;
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};
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X3dProbeStat& ProbeStat() { static X3dProbeStat s; return s; }
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bool ProbeEnabled()
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{
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static int s_nOn = -1;
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if (s_nOn < 0)
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{
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const char* psz = ::getenv("AEC_X3D_SIZEPROBE");
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s_nOn = (psz != NULL && psz[0] != '\0' && psz[0] != '0') ? 1 : 0;
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}
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return s_nOn == 1;
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}
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long long ProbeQpc()
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{
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LARGE_INTEGER li;
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::QueryPerformanceCounter(&li);
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return (long long)li.QuadPart;
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}
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long long ProbeQpcFreq()
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{
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static long long s_f = 0;
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if (s_f == 0)
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{
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LARGE_INTEGER li;
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if (!::QueryPerformanceFrequency(&li) || li.QuadPart == 0) s_f = 1;
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else s_f = (long long)li.QuadPart;
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}
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return s_f;
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}
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void ProbeDump()
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{
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TCHAR szTmp[MAX_PATH + 1];
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::memset(szTmp, 0, sizeof(szTmp));
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if (::GetTempPath(MAX_PATH, szTmp) == 0)
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return;
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TCHAR szFile[MAX_PATH + 1];
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::_stprintf_s(szFile, MAX_PATH, _T("%saec_x3d_probe.txt"), szTmp);
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FILE* fp = NULL;
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if (_tfopen_s(&fp, szFile, _T("w")) != 0 || fp == NULL)
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return;
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const X3dProbeStat& s = ProbeStat();
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fprintf(fp, "---- X3dPart geometry size probe ----\n");
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fprintf(fp, "parts measured : %lld\n", s.n);
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fprintf(fp, "total SAT bytes : %lld (%.1f MB)\n", s.bytes, (double)s.bytes / 1048576.0);
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if (s.n > 0)
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{
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fprintf(fp, "avg SAT bytes/part : %lld\n", s.bytes / s.n);
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fprintf(fp, "max SAT bytes/part : %lld\n", s.maxBytes);
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fprintf(fp, "avg acisOut per part: %.3f ms\n", (double)s.outUs / (double)s.n / 1000.0);
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fprintf(fp, "avg Rebuild per part: %.3f ms\n", (double)s.rebuildUs / (double)s.n / 1000.0);
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if (s.outUs > 0)
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fprintf(fp, "rebuild / acisOut : %.1f x\n", (double)s.rebuildUs / (double)s.outUs);
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}
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fclose(fp);
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}
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// 对一个 solid 量 SAT 字节数 + acisOut 耗时
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void ProbeOneSolid(AcDb3dSolid* pSolid, long long nRebuildUs)
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{
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if (!ProbeEnabled())
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return;
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X3dProbeStat& s = ProbeStat();
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++s.n;
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s.rebuildUs += nRebuildUs;
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if (pSolid != NULL)
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{
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TCHAR szTmp[MAX_PATH + 1];
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::memset(szTmp, 0, sizeof(szTmp));
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if (::GetTempPath(MAX_PATH, szTmp) != 0)
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{
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TCHAR szFile[MAX_PATH + 1];
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::_stprintf_s(szFile, MAX_PATH, _T("%saec_x3d_probe_%lu.sat"),
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szTmp, (unsigned long)::GetCurrentProcessId());
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AcDbVoidPtrArray arSolids;
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arSolids.append(pSolid);
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const long long t0 = ProbeQpc();
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Acad::ErrorStatus es = AcDbBody::acisOut(szFile, arSolids);
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const long long t1 = ProbeQpc();
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s.outUs += (t1 - t0) * 1000000LL / ProbeQpcFreq();
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if (es == Acad::eOk)
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{
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WIN32_FILE_ATTRIBUTE_DATA fad;
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::memset(&fad, 0, sizeof(fad));
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if (::GetFileAttributesEx(szFile, GetFileExInfoStandard, &fad))
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{
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const long long nSize =
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((long long)fad.nFileSizeHigh << 32) | (long long)fad.nFileSizeLow;
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s.bytes += nSize;
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if (nSize > s.maxBytes)
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s.maxBytes = nSize;
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}
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::DeleteFile(szFile);
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}
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}
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}
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if (s.n % 100 == 0)
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ProbeDump();
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}
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}
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static void FreeBuffer(int n,AcDbVoidPtrArray& arEntPtrs)
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{
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AcDbEntity* pEnt = NULL;
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@@ -960,7 +1092,11 @@ bool AecDbX3dPart::EnsureCreated() const
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SectionPerf::NoteEnsure("X3dPart", this, true);
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//试点计时：X3dPart 重建总耗时（用来看"几何存盘"这套机制的天花板在哪）
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SectionPerf::Scope perfScope("X3dPart::Rebuild");
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const bool bProbe = ProbeEnabled();
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const long long nProbeT0 = bProbe ? ProbeQpc() : 0;
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const bool bOk = const_cast<AecDbX3dPart*>(this)->Rebuild();
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if (bProbe)
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ProbeOneSolid(m_pSolid, (ProbeQpc() - nProbeT0) * 1000000LL / ProbeQpcFreq());
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SectionPerf::NoteEnsure(m_pSolid != NULL ? "X3dPart.rebuild_ok" : "X3dPart.rebuild_null", this, false);
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if (m_pSolid == NULL)
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{
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