X264的时耗分析

测试环境：Intel Pentium4 3.00GHz  (双核cpu),开启超线程
内存:    DDR 1.00G
操作系统: Windows sever 2003 Enterprise Edition
分析软件: Intel(R) VTune(TM) Performance Analyzer 8.0(评估版lic)
编译软件: VC71+nasm0.98
Bus Speed: 800MHz
测试程序: X264 20060506 编码器

1、Debug版本
编码参数:
X264 -fps -o foreman.264 forman.cif 352x288
编码400frames,编码效率:23fps左右(libx264 debug版本),35fps(libx264 release版本)，提高了10fps以上，比较可观

2、
编码参数:
X264 -fps --no-asm -o foreman.264 forman.cif 352x288
--no-asm，Disable all CPU optimizations即未使用mmx,mmxext, sse,sse2,3dNow,3dnow ext,altivec等汇编指令优化。
编码400frames，编码效率2.67fps(libx264 debug版本),12.67fps(libx264 release版本),提高了10fps

Clockticks per Instructions Retired (CPI)表示该程序段的平均执行一条指令所需的时钟周期数,CPI越大表示该程序段调用的浮点数操作,乘法，除法，I/O处理，系统调用或文

件访问等代价昂贵的操作较多。
Instructions Retired events, 表示执行的指令数,越大表示该模块调用的较多.
Clockticks events 则表示该模块所消耗的时钟周期数,一般Clockticks events = Instructions Retired events * Clockticks per Instructions Retired (CPI),越大表示该模块消耗的时间越多,后面的Clockticks %则表示该模块的在所有程序中的时耗百分比.

这里有一点需要注意:(还是举例吧),例如要分析视频编码中去块滤波器算法/程序的时耗,并不是一个x264_frame_deblocking_filter函数的时间消耗就是所有x264编解码过程中的时间消耗,由于x264_frame_deblocking_filter调用deblck_edge,x264_clip3(该函数也被其他函数所调用)函数,而deblock_edge下又调用x264_deblock_v8_luma_mmxext, x264_deblock_h_luma_mmxext,x_264_deblock_h_chroma_mmxext, deblock_luma_intra_c, x264_deblock_v_chroma_mmxext（这些函数通过指针重定义的方式以适应于不同的硬件平台，比如Intel,AMD的CPU采用不同的指令系统，其实Mplayer,FFMPEG,T264等软件都采用类似的重定义方式,已达到一个软件使用与不同构架/平台，如arm,powerpc,x86等）等函数。那么这里如果统计去块滤波器的算法的时间消耗百分比，就需要将该函数及其所有调用的子函数的时间消耗都计算在内，x264_deblock_****都是唯一被deblock_edge调用，但对于x264_clip3，并不仅仅是去块滤波器部分调用，那么就只能部分计算在去块滤波器之内，至于部分是多少要根据个函数的调用次数，这里不确定。

相关x264时耗分析数据后面的表格。deblock占4.3%左右，quant+dequant占3.3%左右，DCT+IDCT占1.1%左右，主要是运动估计和运动补偿，ME中大量的sad/satd的计算，MC中的六阶滤波器tap_filter是主要时耗，具体我没有太细统计将近20%左右，x264中由于采用了算法优化，程序优化及mmx,sse,sse2等指令优化，将原本消耗较大的去块滤波器等都有了较大程度地优化。

这里再讨论一下程序性能优化技术，程序性能优化可以大致从3个部分考虑。
1、算法结构优化，实现同样的应用功能可采用多种不同的算法和方法，比如H.264种的运动估计全搜索和快速运动估计算法，实现的编码效率基本一致，但是处理时间可以节省10~20倍，所以需要选择高效的算法。还有递归算法非递归化，递归算法使得程序结构清晰，可读性高，但却需要执行大量的过程调用，堆栈保存等，运行效率低下。

2、编译优化，现在很多编译器都实现了较强的代码优化功能，多数编译器都基于数据流分析以实现别名分析（通过变量重命名来消除数据相关，提高流水线的执行效率），常数折叠，公共子表达式消除、冗余代码删除，循环逆转和循环展开等与体系结构无关的优化，例如GNU gcc就是个很好的编译工具。还有借用并行程序设计技术，进行相关性分析，并通过相应技术是程序具有更好的局部性以提高Cashe命中率。对于GCC中采用-O -O2 -O3 -O4等选项选择针对速度/面积等性能优化,另外debug版本由于程序中加入较多的debug参数,影响程序效率,上面x264的debug和release运行效率的对比可见一斑.编译优化属于静态优化，由编译器自动完成，但是编译器很难得到程序的语义信息，算法流程等信息。所以需要我们手工编程优化以最大程度提高程序运行效率

3、程序优化，包括a)使用inline函数，很多编译器支持inline关键字，减少函数调用开销却增加了代码量。b)针对程序运行平台，如x86(Intel)，Xscale，ARM，DSP等不同构架，可采用相应的汇编优化，将主要时耗部分/循环调用等，进行汇编指令优化MMX,SSE,WiMMX,ARM/Thumb指令,DSP汇编等，或者采用专用的库函数,如针对Intel CPU/Xscale构架的嵌入式系统（PXA255,PXA270等）可使用IPP/GPP库，提高程序效率。c)对于DSP系统，由于有多个并行处理单元，编译器会并行优化，所以需要尽量减少频繁小循环跳转，将循环展开，同时减少循环或内层循环也可以提高CPU的流线效率，尽量不断流。d)在Switch语句中根据发生频率排序case语句，编译器对于switch语句将生成if-else-if的嵌套代码，按概率排序可提高效率（FPGA/CPLD等逻辑器件中，采用VHDL语言描述的switch是生成多个逻辑器件，并且完全并行的）。e)减少函数调用参数. f)减少耗时的浮点数操作，除法操作等降低CPI

  Size Function Clockticks per Instructions Retired (CPI) Instructions Retired events Clockticks events Clockticks % Source File 4917 refine_subpel 3.050938338 1119000000 3414000000 6.582219909 f:/x264-060506/x264-060506/encoder/me.c 176 x264_mc_chroma_mmxext 1.463709677 2232000000 3267000000 6.298802707 　 21502 x264_me_search_ref 2.515923567 942000000 2370000000 4.569379374 f:/x264-060506/x264-060506/encoder/me.c 880 x264_pixel_satd_8x8_sse2 1.43551797 1419000000 2037000000 3.927352652 　 99 RTC_CheckStackVars 3.563157895 570000000 2031000000 3.915784603 　 3296 x264_pixel_satd_16x16_sse2 1.54047619 1260000000 1941000000 3.742263867 　 237 get_ref_mmx 1.725925926 810000000 1398000000 2.695355428 f:/x264-060506/x264-060506/common/i386/mc-c.c 1183 block_residual_write_cabac 3.15862069 435000000 1374000000 2.649083232 f:/x264-060506/x264-060506/encoder/cabac.c 6480 x264_macroblock_analyse 24.05555556 54000000 1299000000 2.504482619 f:/x264-060506/x264-060506/encoder/analyse.c 272 x264_pixel_satd_4x4_mmxext 1.229850746 1005000000 1236000000 2.383018104 　 80 x264_pixel_avg_w16_mmxext 2.096045198 531000000 1113000000 2.145873099 　 232 x264_mb_decimate_score 1.354085603 771000000 1044000000 2.012840534 f:/x264-060506/x264-060506/encoder/macroblock.c 64 x264_pixel_avg_w8_mmxext 1.756906077 543000000 954000000 1.839319799 　 2413 x264_frame_deblocking_filter 1.703910615 537000000 915000000 1.76412748 f:/x264-060506/x264-060506/common/frame.c 2491 x264_macroblock_cache_save 2.152173913 414000000 891000000 1.717855284 f:/x264-060506/x264-060506/common/macroblock.c 656 x264_center_filter_mmxext 1.211864407 708000000 858000000 1.654231014 　 146 quant_4x4 2.989247312 279000000 834000000 1.607958818 f:/x264-060506/x264-060506/encoder/macroblock.c 5930 x264_macroblock_cache_load 2.090225564 399000000 834000000 1.607958818 f:/x264-060506/x264-060506/common/macroblock.c 206 x264_cabac_encode_renorm 2.125984252 381000000 810000000 1.561686622 f:/x264-060506/x264-060506/common/cabac.c 83 array_non_zero_count 1.191964286 672000000 801000000 1.544334548 f:/x264-060506/x264-060506/encoder/macroblock.h 96 memset 9.464285714 84000000 795000000 1.532766499 F:/VS70Builds/3077/vc/crtbld/crt/src/intel/memset.asm 363 predict_16x16_p 1.095435685 723000000 792000000 1.526982474 f:/x264-060506/x264-060506/common/predict.c 184 x264_cabac_encode_decision 2.371428571 315000000 747000000 1.440222107 f:/x264-060506/x264-060506/common/cabac.c 37 _RTC_CheckEsp 1.707142857 420000000 717000000 1.382381861 　 3693 x264_macroblock_encode 2.890243902 246000000 711000000 1.370813812 f:/x264-060506/x264-060506/encoder/macroblock.c 47 x264_clip_uint8 1.317365269 501000000 660000000 1.272485395 f:/x264-060506/x264-060506/common/clip1.h 304 x264_quant_4x4_core15_mmx 1.674796748 369000000 618000000 1.191509052 　 2091 x264_mb_analyse_intra 1.844036697 327000000 603000000 1.162588929 f:/x264-060506/x264-060506/encoder/analyse.c 1680 x264_pixel_satd_8x16_sse2 1.144508671 519000000 594000000 1.145236856 　 1696 x264_pixel_satd_16x8_sse2 1.449612403 387000000 561000000 1.081612586 　 164 motion_compensation_chroma_mmxext 1.459677419 372000000 543000000 1.046908439 f:/x264-060506/x264-060506/common/mc.c 328 deblock_edge 1.594059406 303000000 483000000 0.931227948 f:/x264-060506/x264-060506/common/frame.c 363 predict_8x8c_p 1.453703704 324000000 471000000 0.90809185 f:/x264-060506/x264-060506/common/predict.c 176 x264_macroblock_cache_mv 1.662650602 249000000 414000000 0.798195384 f:/x264-060506/x264-060506/common/macroblock.h 71 x264_clip3 1.666666667 216000000 360000000 0.694082943 f:/x264-060506/x264-060506/common/common.h 121 x264_macroblock_cache_ref 2.333333333 153000000 357000000 0.688298918 f:/x264-060506/x264-060506/common/macroblock.h 272 x264_horizontal_filter_mmxext 1.216494845 291000000 354000000 0.682514894 　 1104 x264_pixel_sad_x4_16x16_sse2 4.423076923 78000000 345000000 0.66516282 　 480 x264_pixel_satd_8x4_sse2 1.430379747 237000000 339000000 0.653594771 　 496 x264_deblock_v8_luma_mmxext 1.066666667 315000000 336000000 0.647810747 　 432 x264_pixel_sad_x4_8x8_mmxext 1.671641791 201000000 336000000 0.647810747 　 288 x264_pixel_sad_16x16_sse2 4.608695652 69000000 318000000 0.6131066 　 910 x264_mb_predict_mv 2.363636364 132000000 312000000 0.601538551 f:/x264-060506/x264-060506/common/macroblock.c 106 bs_write1 2.666666667 117000000 312000000 0.601538551 f:/x264-060506/x264-060506/common/bs.h 224 x264_sub4x4_dct_mmx 1.16091954 261000000 303000000 0.584186477 　 211 scan_zigzag_4x4full 1.672727273 165000000 276000000 0.532130256 f:/x264-060506/x264-060506/encoder/macroblock.c 656 x264_deblock_h_luma_mmxext 3.214285714 84000000 270000000 0.520562207 　 227 predict_16x16_dc 2.378378378 111000000 264000000 0.508994158 f:/x264-060506/x264-060506/common/predict.c 496 x264_pixel_satd_4x8_mmxext 1.242857143 210000000 261000000 0.503210134 　 960 x264_pixel_ssd_16x16_sse2 4.315789474 57000000 246000000 0.474290011 　 33 abs 1.860465116 129000000 240000000 0.462721962 f:/vs70builds/3077/vc/crtbld/crt/src/abs.c 864 x264_pixel_sad_x3_16x16_sse2 3.391304348 69000000 234000000 0.451153913 　 962 x264_mb_analyse_inter_p8x8 1.948717949 117000000 228000000 0.439585864 f:/x264-060506/x264-060506/encoder/analyse.c 3064 x264_macroblock_write_cabac 2.62962963 81000000 213000000 0.410665741 f:/x264-060506/x264-060506/encoder/cabac.c 1209 x264_mb_encode_8x8_chroma 2.379310345 87000000 207000000 0.399097692 f:/x264-060506/x264-060506/encoder/macroblock.c 829 memcpy 11 18000000 198000000 0.381745619 F:/VS70Builds/3077/vc/crtbld/crt/src/intel/memcpy.asm 386 predict_8x8c_dc 2.52 75000000 189000000 0.364393545 f:/x264-060506/x264-060506/common/predict.c 202 bs_write 1.909090909 99000000 189000000 0.364393545 f:/x264-060506/x264-060506/common/bs.h 352 x264_pixel_sad_x3_8x8_mmxext 2.172413793 87000000 189000000 0.364393545 　 144 x264_pixel_sad_8x8_mmxext 2.384615385 78000000 186000000 0.358609521 　 156 predict_16x16_h 2 90000000 180000000 0.347041471 f:/x264-060506/x264-060506/common/predict.c 178 predict_16x16_v 2.52173913 69000000 174000000 0.335473422 f:/x264-060506/x264-060506/common/predict.c 128 x264_mc_copy_w16_mmx 9.666666667 18000000 174000000 0.335473422 　 405 x264_cabac_mb_mvd_cpn 2.192307692 78000000 171000000 0.329689398 f:/x264-060506/x264-060506/encoder/cabac.c 161 x264_cabac_putbit 1.4 120000000 168000000 0.323905373 f:/x264-060506/x264-060506/common/cabac.c 304 x264_dequant_4x4_mmx 2.545454545 66000000 168000000 0.323905373 　 592 x264_pixel_sad_x4_16x8_sse2 2.291666667 72000000 165000000 0.318121349 　 103 x264_median 2.6 60000000 156000000 0.300769275 f:/x264-060506/x264-060506/common/common.h 398 predict_4x4_ddl 1.5625 96000000 150000000 0.289201226 f:/x264-060506/x264-060506/common/predict.c 272 x264_add4x4_idct_mmx 1.139534884 129000000 147000000 0.283417202 　 418 x264_cabac_mb_cbp_luma 2.666666667 54000000 144000000 0.277633177 f:/x264-060506/x264-060506/encoder/cabac.c 414 predict_4x4_ddr 2.285714286 63000000 144000000 0.277633177 f:/x264-060506/x264-060506/common/predict.c 405 predict_4x4_vl 1.777777778 81000000 144000000 0.277633177 f:/x264-060506/x264-060506/common/predict.c 1455 x264_mb_predict_mv_ref16x16 3.692307692 39000000 144000000 0.277633177 f:/x264-060506/x264-060506/common/macroblock.c 1181 x264_mb_analyse_inter_p16x16 4.6 30000000 138000000 0.266065128 f:/x264-060506/x264-060506/encoder/analyse.c 176 x264_macroblock_cache_mvd 1.769230769 78000000 138000000 0.266065128 f:/x264-060506/x264-060506/common/macroblock.h 816 x264_pixel_sad_x4_8x16_mmxext 1.769230769 78000000 138000000 0.266065128 　 199 scan_zigzag_4x4 2.045454545 66000000 135000000 0.260281104 f:/x264-060506/x264-060506/encoder/macroblock.c 446 predict_4x4_mode_available 2.25 60000000 135000000 0.260281104 f:/x264-060506/x264-060506/encoder/analyse.c 1148 x264_mb_analyse_inter_p16x8 3.142857143 42000000 132000000 0.254497079 f:/x264-060506/x264-060506/encoder/analyse.c 1746 x264_mb_analyse_init 8.2 15000000 123000000 0.237145005 f:/x264-060506/x264-060506/encoder/analyse.c 511 x264_mb_analyse_intra_chroma 2.733333333 45000000 123000000 0.237145005 f:/x264-060506/x264-060506/encoder/analyse.c 425 predict_4x4_hd 1.28125 96000000 123000000 0.237145005 f:/x264-060506/x264-060506/common/predict.c 425 predict_4x4_vr 1.413793103 87000000 123000000 0.237145005 f:/x264-060506/x264-060506/common/predict.c 122 predict_8x8c_h 1.952380952 63000000 123000000 0.237145005 f:/x264-060506/x264-060506/common/predict.c 425 x264_mb_encode_i4x4 2.105263158 57000000 120000000 0.231360981 f:/x264-060506/x264-060506/encoder/macroblock.c 464 x264_pixel_sad_x3_16x8_sse2 5 24000000 120000000 0.231360981 　 672 x264_pixel_sad_x3_8x16_mmxext 2.666666667 45000000 120000000 0.231360981 　 297 predict_4x4_hu 1.772727273 66000000 117000000 0.225576956 f:/x264-060506/x264-060506/common/predict.c 120 predict_8x8c_v 3.083333333 36000000 111000000 0.214008907 f:/x264-060506/x264-060506/common/predict.c 464 x264_deblock_h_chroma_mmxext 1.166666667 90000000 105000000 0.202440858 　 240 x264_pixel_sad_8x16_mmxext 1.888888889 54000000 102000000 0.196656834 　 1104 x264_mb_analyse_inter_p8x16 3 33000000 99000000 0.190872809 f:/x264-060506/x264-060506/encoder/analyse.c 176 x264_pixel_sad_16x8_sse2 3.666666667 27000000 99000000 0.190872809 　 194 x264_cabac_encode_bypass 1.192307692 78000000 93000000 0.17930476 f:/x264-060506/x264-060506/common/cabac.c 836 x264_cabac_mb_cbf_ctxidxinc 1.875 48000000 90000000 0.173520736 f:/x264-060506/x264-060506/encoder/cabac.c 80 x264_mc_copy_w8_mmx 3 30000000 90000000 0.173520736 　 1385 x264_slice_write 4.833333333 18000000 87000000 0.167736711 f:/x264-060506/x264-060506/encoder/encoder.c 680 deblock_luma_intra_c 2.153846154 39000000 84000000 0.161952687 f:/x264-060506/x264-060506/common/frame.c 503 x264_mb_mc_0xywh 1.857142857 42000000 78000000 0.150384638 f:/x264-060506/x264-060506/common/macroblock.c 134 predict_4x4_dc 5 15000000 75000000 0.144600613 f:/x264-060506/x264-060506/common/predict.c 577 x264_mb_predict_mv_16x16 2.5 30000000 75000000 0.144600613 f:/x264-060506/x264-060506/common/macroblock.c 324 plane_expand_border 6.25 12000000 75000000 0.144600613 f:/x264-060506/x264-060506/common/frame.c 272 x264_deblock_v_chroma_mmxext 1.642857143 42000000 69000000 0.133032564 　 123 x264_sub8x8_dct_mmx 1.111111111 54000000 60000000 0.11568049 f:/x264-060506/x264-060506/common/i386/dct-c.c 1359 x264_macroblock_probe_skip 2.714285714 21000000 57000000 0.109896466 f:/x264-060506/x264-060506/encoder/macroblock.c 305 x264_cabac_mb_mvd 3.4 15000000 51000000 0.098328417 f:/x264-060506/x264-060506/encoder/cabac.c 1880 x264_analyse_update_cache 4 12000000 48000000 0.092544392 f:/x264-060506/x264-060506/encoder/analyse.c 64 array_non_zero 4.666666667 9000000 42000000 0.080976343 f:/x264-060506/x264-060506/encoder/macroblock.h 271 x264_mb_dequant_2x2_dc 3.5 12000000 42000000 0.080976343 f:/x264-060506/x264-060506/common/quant.c 266 mc_luma_mmx 2.166666667 18000000 39000000 0.075192319 f:/x264-060506/x264-060506/common/i386/mc-c.c 199 dct2x2dc 3.25 12000000 39000000 0.075192319 f:/x264-060506/x264-060506/common/dct.c 149 quant_2x2_dc 1 33000000 33000000 0.06362427 f:/x264-060506/x264-060506/encoder/macroblock.c 320 x264_cabac_mb_cbp_chroma 2.75 12000000 33000000 0.06362427 f:/x264-060506/x264-060506/encoder/cabac.c 61 _alloca_probe 　 0 33000000 0.06362427 F:/VS70Builds/3077/vc/crtbld/crt/src/intel/chkstk.asm 38 x264_me_search 2.5 12000000 30000000 0.057840245 f:/x264-060506/x264-060506/encoder/analyse.c 145 x264_mb_predict_intra4x4_mode 1 30000000 30000000 0.057840245 f:/x264-060506/x264-060506/common/macroblock.c 194 x264_mb_predict_mv_pskip 　 0 30000000 0.057840245 f:/x264-060506/x264-060506/common/macroblock.c 279 x264_nal_encode 2 15000000 30000000 0.057840245 f:/x264-060506/x264-060506/common/common.c 172 x264_cabac_mb_skip 3 9000000 27000000 0.052056221 f:/x264-060506/x264-060506/encoder/cabac.c 59 predict_4x4_v 4.5 6000000 27000000 0.052056221 f:/x264-060506/x264-060506/common/predict.c 1253 x264_mb_mc 3 9000000 27000000 0.052056221 f:/x264-060506/x264-060506/common/macroblock.c 74 x264_deblock_v_luma_mmxext 1.125 24000000 27000000 0.052056221 f:/x264-060506/x264-060506/common/frame.c 227 predict_8x8chroma_mode_available 4 6000000 24000000 0.046272196 f:/x264-060506/x264-060506/encoder/analyse.c 47 bs_size_te 　 0 24000000 0.046272196 f:/x264-060506/x264-060506/common/bs.h 1131 x264_cabac_mb_type 1 21000000 21000000 0.040488172 f:/x264-060506/x264-060506/encoder/cabac.c 80 predict_4x4_h 3.5 6000000 21000000 0.040488172 f:/x264-060506/x264-060506/common/predict.c 17 x264_ratecontrol_qp 　 0 18000000 0.034704147 f:/x264-060506/x264-060506/encoder/ratecontrol.c 55 scan_zigzag_2x2_dc 2 9000000 18000000 0.034704147 f:/x264-060506/x264-060506/encoder/macroblock.c 115 x264_macroblock_encode_skip 2 9000000 18000000 0.034704147 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发表于 @ 2006年10月15日 22:10:00|评论(1)|编辑