{"id":76370,"date":"2026-02-22T10:41:33","date_gmt":"2026-02-22T02:41:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76370.html"},"modified":"2026-02-22T10:41:33","modified_gmt":"2026-02-22T02:41:33","slug":"android-cpu-%e4%bd%bf%e7%94%a8%e7%8e%87%e9%87%87%e9%9b%86%ef%bc%9a-proc-stat-%e8%ae%a1%e7%ae%97%e5%85%ac%e5%bc%8f%e4%b8%8e%e5%ae%8c%e6%95%b4%e6%96%b9%e6%a1%88%ef%bc%88%e9%99%84%e5%ae%9e%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76370.html","title":{"rendered":"Android CPU \u4f7f\u7528\u7387\u91c7\u96c6\uff1a\/proc\/stat \u8ba1\u7b97\u516c\u5f0f\u4e0e\u5b8c\u6574\u65b9\u6848\uff08\u9644\u5b9e\u4f8b\uff09"},"content":{"rendered":"

\u505a Android \u6027\u80fd\u6d4b\u8bd5，CPU \u4f7f\u7528\u7387\u662f\u6700\u57fa\u7840\u7684\u6307\u6807\u3002\u4f46\u5f88\u591a\u4eba\u53ea\u4f1a\u7528 top \u770b\u4e00\u773c，\u5bf9\u80cc\u540e\u7684\u6570\u636e\u6e90\u548c\u8ba1\u7b97\u903b\u8f91\u5e76\u4e0d\u6e05\u695a\u3002 \u672c\u7bc7\u4ece\u6982\u5ff5\u8bb2\u8d77，\u5148\u7ed9\u516c\u5f0f\u3001\u518d\u770b\u6570\u636e\u6e90\u3001\u6700\u540e\u7528\u771f\u5b9e\u6570\u636e\u8d70\u4e00\u904d\u5b8c\u6574\u8ba1\u7b97\u3002<\/p>\n

\n

\u4e00\u3001CPU \u4f7f\u7528\u7387\u5230\u5e95\u5728\u5ea6\u91cf\u4ec0\u4e48<\/h3>\n

\u5148\u660e\u786e\u4e00\u4e2a\u6982\u5ff5：CPU \u4f7f\u7528\u7387\u8861\u91cf\u7684\u662f"\u65f6\u95f4\u7247\u7684\u5206\u914d\u6bd4\u4f8b"，\u4e0d\u662f"\u7b97\u529b\u7684\u6d88\u8017\u6bd4\u4f8b"\u3002<\/p>\n

Linux \u5185\u6838\u7528\u4e00\u4e2a\u53eb tick \u7684\u65f6\u95f4\u7247\u6765\u8c03\u5ea6\u4efb\u52a1\u3002\u6bcf\u4e2a tick \u5927\u7ea6 4~10 \u6beb\u79d2（\u53d6\u51b3\u4e8e\u5185\u6838\u914d\u7f6e CONFIG_HZ）\u3002\u6bcf\u4e2a tick \u7ed3\u675f\u65f6，\u5185\u6838\u8bb0\u5f55\u8fd9\u4e2a tick \u88ab\u5206\u914d\u5230\u4e86\u54ea\u4e2a\u72b6\u6001：\u7528\u6237\u6001\u3001\u5185\u6838\u6001\u3001\u7a7a\u95f2\u3001\u7b49\u5f85 IO\u2026\u2026<\/p>\n

\u4e00\u53e5\u8bdd\u5b9a\u4e49：<\/p>\n

CPU \u4f7f\u7528\u7387 = \u4e00\u6bb5\u65f6\u95f4\u5185，\u975e\u7a7a\u95f2 tick \u5360\u603b tick \u7684\u6bd4\u4f8b<\/p>\n

\n

\u4e8c\u3001\u6838\u5fc3\u516c\u5f0f（\u5148\u770b\u7ed3\u8bba）<\/h3>\n

CPU \u7edf\u8ba1\u6570\u636e\u90fd\u662f\u4ece\u5f00\u673a\u5f00\u59cb\u7684\u7d2f\u79ef\u503c，\u6240\u4ee5\u5fc5\u987b\u91c7\u4e24\u6b21\u3001\u53d6\u5dee\u503c\u624d\u80fd\u7b97\u51fa\u4e00\u6bb5\u65f6\u95f4\u5185\u7684\u4f7f\u7528\u7387\u3002<\/p>\n

2.1 \u6574\u673a CPU \u4f7f\u7528\u7387<\/h4>\n

\u7b2c 1 \u6b21\u91c7\u6837 \u2192 total\u2081, idle\u2081
\n \u7b49\u5f85 N \u79d2
\n\u7b2c 2 \u6b21\u91c7\u6837 \u2192 total\u2082, idle\u2082<\/p>\n

\u0394total = total\u2082 \u2212 total\u2081 \u2190 \u8fd9\u6bb5\u65f6\u95f4\u6240\u6709\u6838\u5fc3\u603b\u5171\u4ea7\u751f\u4e86\u591a\u5c11 tick
\n\u0394idle = idle\u2082 \u2212 idle\u2081 \u2190 \u5176\u4e2d\u6709\u591a\u5c11 tick \u662f\u7a7a\u95f2\u7684<\/p>\n

\u6574\u673a CPU% = (\u0394total \u2212 \u0394idle) \/ \u0394total \u00d7 100<\/p>\n

\u5176\u4e2d：<\/p>\n\n\u53d8\u91cf\u542b\u4e49\u600e\u4e48\u5f97\u5230<\/tr>\n\n\n\n
total<\/td>\n\u6240\u6709\u72b6\u6001 tick \u4e4b\u548c<\/td>\nuser + nice + system + idle + iowait + irq + softirq + steal<\/td>\n<\/tr>\n
idle<\/td>\n\u7a7a\u95f2 tick<\/td>\n\/proc\/stat \u7b2c\u4e00\u884c\u7684\u7b2c 4 \u4e2a\u6570\u503c\u5b57\u6bb5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2.2 \u8fdb\u7a0b CPU \u4f7f\u7528\u7387<\/h4>\n

\u7b2c 1 \u6b21\u91c7\u6837 \u2192 process_time\u2081（\u540c\u65f6\u91c7\u6574\u673a total\u2081）
\n \u7b49\u5f85 N \u79d2
\n\u7b2c 2 \u6b21\u91c7\u6837 \u2192 process_time\u2082（\u540c\u65f6\u91c7\u6574\u673a total\u2082）<\/p>\n

\u0394process = process_time\u2082 \u2212 process_time\u2081 \u2190 \u8fdb\u7a0b\u81ea\u5df1\u6d88\u8017\u7684 tick \u589e\u91cf
\n\u0394total = total\u2082 \u2212 total\u2081 \u2190 \u6574\u673a\u603b tick \u589e\u91cf（\u540c\u4e0a）<\/p>\n

\u8fdb\u7a0b CPU% = \u0394process \/ \u0394total \u00d7 100<\/p>\n

\u5176\u4e2d：<\/p>\n\n\u53d8\u91cf\u542b\u4e49\u600e\u4e48\u5f97\u5230<\/tr>\n\n\n\n
process_time<\/td>\n\u8fdb\u7a0b\u7d2f\u79ef\u7684 CPU tick<\/td>\nutime + stime + cutime + cstime<\/td>\n<\/tr>\n
\u0394total<\/td>\n\u6574\u673a\u603b tick \u589e\u91cf<\/td>\n\u548c\u6574\u673a\u516c\u5f0f\u7528\u540c\u4e00\u4e2a\u5206\u6bcd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5173\u952e\u70b9：\u8fdb\u7a0b CPU% \u7684\u5206\u6bcd\u662f\u6574\u673a\u7684 \u0394total，\u4e0d\u662f\u8fdb\u7a0b\u81ea\u5df1\u7684\u6570\u636e\u3002<\/p>\n

\u542b\u4e49\u662f"\u8fd9\u4e2a\u8fdb\u7a0b\u5728\u6240\u6709 CPU \u8d44\u6e90\u4e2d\u5360\u4e86\u591a\u5c11\u6bd4\u4f8b"\u30024 \u6838\u8bbe\u5907\u4e0a，\u5355\u7ebf\u7a0b\u8fdb\u7a0b\u6700\u9ad8\u7ea6 25%，4 \u7ebf\u7a0b\u8dd1\u6ee1\u63a5\u8fd1 100%\u3002<\/p>\n

2.3 \u516c\u5f0f\u5c0f\u7ed3<\/h4>\n

\u6574\u673a CPU% = (\u0394total \u2212 \u0394idle) \/ \u0394total \u00d7 100<\/p>\n

\u8fdb\u7a0b CPU% = \u0394process \/ \u0394total \u00d7 100<\/p>\n

\u5c31\u8fd9\u4e24\u4e2a\u516c\u5f0f，\u6240\u6709 CPU \u91c7\u96c6\u5de5\u5177（top\u3001dumpsys cpuinfo\u3001\u5404\u79cd APM SDK）\u5e95\u5c42\u90fd\u662f\u8fd9\u4e2a\u903b\u8f91\u3002<\/p>\n

\n

\u4e09\u3001\u6570\u636e\u6e90：\u6570\u636e\u4ece\u54ea\u6765<\/h3>\n

3.1 \u6574\u673a\u6570\u636e：\/proc\/stat \u7b2c\u4e00\u884c<\/h4>\n

Linux \u5185\u6838\u63d0\u4f9b\u7684 CPU \u7edf\u8ba1\u63a5\u53e3，\u6240\u6709 Android \u8bbe\u5907\u90fd\u6709\u3002\u8bfb\u53d6\u540e\u7b2c\u4e00\u884c\u683c\u5f0f\u5982\u4e0b：<\/p>\n

cpu 10132153 290696 3084719 46828483 16683 0 25195 0 0 0<\/p>\n

\u8df3\u8fc7\u5f00\u5934\u7684 cpu，\u540e\u9762 8 \u4e2a\u6570\u503c\u4f9d\u6b21\u662f：<\/p>\n\n\u4f4d\u7f6e\u540d\u79f0\u542b\u4e49<\/tr>\n\n\n\n\n\n\n\n\n\n
1<\/td>\nuser<\/td>\n\u7528\u6237\u6001\u65f6\u95f4（App \u4ee3\u7801\u6267\u884c）<\/td>\n<\/tr>\n
2<\/td>\nnice<\/td>\n\u4f4e\u4f18\u5148\u7ea7\u7528\u6237\u6001\u65f6\u95f4<\/td>\n<\/tr>\n
3<\/td>\nsystem<\/td>\n\u5185\u6838\u6001\u65f6\u95f4（\u7cfb\u7edf\u8c03\u7528\u3001\u9a71\u52a8）<\/td>\n<\/tr>\n
4<\/td>\nidle<\/td>\n\u7a7a\u95f2\u65f6\u95f4（CPU \u5728\u53d1\u5446）<\/td>\n<\/tr>\n
5<\/td>\niowait<\/td>\n\u7b49\u5f85 IO \u7684\u7a7a\u95f2\u65f6\u95f4（\u7b49\u78c1\u76d8\/\u7f51\u7edc）<\/td>\n<\/tr>\n
6<\/td>\nirq<\/td>\n\u786c\u4e2d\u65ad\u5904\u7406\u65f6\u95f4<\/td>\n<\/tr>\n
7<\/td>\nsoftirq<\/td>\n\u8f6f\u4e2d\u65ad\u5904\u7406\u65f6\u95f4<\/td>\n<\/tr>\n
8<\/td>\nsteal<\/td>\n\u865a\u62df\u5316\u88ab\u5077\u8d70\u7684\u65f6\u95f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

total = \u4e0a\u9762 8 \u4e2a\u5b57\u6bb5\u5168\u90e8\u76f8\u52a0\u3002<\/p>\n

3.2 \u6c47\u603b\u884c vs \u5404\u6838：\u7528\u54ea\u4e00\u884c<\/h4>\n

\/proc\/stat \u7684\u5b8c\u6574\u8f93\u51fa\u4e2d，\u7b2c\u4e00\u884c\u4e0b\u9762\u8fd8\u6709\u6bcf\u4e2a\u6838\u5fc3\u7684\u5355\u72ec\u6570\u636e：<\/p>\n

cpu 10132153 290696 3084719 46828483 16683 0 25195 0 0 0 \u2190 \u6c47\u603b\u884c（\u6211\u4eec\u7528\u8fd9\u884c）
\ncpu0 2503274 72633 771347 11709498 4180 0 6313 0 0 0 \u2190 \u6838\u5fc3 0
\ncpu1 2522508 73222 770877 11707883 4115 0 6239 0 0 0 \u2190 \u6838\u5fc3 1
\ncpu2 2505698 72460 771276 11706498 4198 0 6312 0 0 0 \u2190 \u6838\u5fc3 2
\ncpu3 2514673 72381 771219 11704604 4190 0 6331 0 0 0 \u2190 \u6838\u5fc3 3<\/p>\n

\u6c47\u603b\u884c = \u6240\u6709\u5728\u7ebf\u6838\u5fc3\u7684\u7d2f\u52a0\u3002\u4ee5 idle \u5b57\u6bb5\u9a8c\u8bc1：<\/p>\n

cpu0.idle + cpu1.idle + cpu2.idle + cpu3.idle
\n= 11709498 + 11707883 + 11706498 + 11704604
\n= 46828483
\n= \u6c47\u603b\u884c\u7684 idle \u2713<\/p>\n

\u6240\u4ee5：<\/p>\n\n\u95ee\u9898\u7b54\u6848<\/tr>\n\n\n\n\n\n
\u9700\u8981\u81ea\u5df1\u52a0\u5404\u6838\u6570\u636e\u5417？<\/td>\n\u4e0d\u9700\u8981，\u5185\u6838\u5df2\u7ecf\u5e2e\u6211\u4eec\u52a0\u597d\u4e86<\/td>\n<\/tr>\n
\u76f4\u63a5\u7528\u6c47\u603b\u884c\u5c31\u884c？<\/td>\n\u662f\u7684，\u53ea\u53d6\u7b2c\u4e00\u884c cpu<\/td>\n<\/tr>\n
\u5173\u6838\u4e86\u600e\u4e48\u529e？<\/td>\n\u5173\u6389\u7684\u6838\u4e0d\u51fa\u73b0\u5728\u8f93\u51fa\u4e2d，\u6c47\u603b\u884c\u53ea\u542b\u5728\u7ebf\u6838<\/td>\n<\/tr>\n
4 \u6838 total \u6bcf\u79d2\u589e\u52a0\u591a\u5c11？<\/td>\n\u7ea6 4 \u00d7 HZ（HZ=100 \u65f6\u7ea6 400 tick\/\u79d2）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3.3 \u8fdb\u7a0b\u6570\u636e：\/proc\/{pid}\/stat<\/h4>\n

\u8bfb\u53d6\u76ee\u6807\u8fdb\u7a0b\u7684 stat \u6587\u4ef6，\u8f93\u51fa\u662f\u4e00\u884c\u5f88\u957f\u7684\u6570\u636e：<\/p>\n

12345 (com.example.app) S 1 12345 12345 0 -1 … 5000 1200 0 0 …<\/p>\n

\u6211\u4eec\u5173\u5fc3\u7684\u662f\u7b2c 14~17 \u4e2a\u5b57\u6bb5（\u4ece 1 \u5f00\u59cb\u8ba1\u6570）：<\/p>\n\n\u5b57\u6bb5\u53f7\u540d\u79f0\u542b\u4e49<\/tr>\n\n\n\n\n\n
14<\/td>\nutime<\/td>\n\u8fdb\u7a0b\u5728\u7528\u6237\u6001\u6d88\u8017\u7684 tick<\/td>\n<\/tr>\n
15<\/td>\nstime<\/td>\n\u8fdb\u7a0b\u5728\u5185\u6838\u6001\u6d88\u8017\u7684 tick<\/td>\n<\/tr>\n
16<\/td>\ncutime<\/td>\n\u5df2\u9000\u51fa\u5b50\u8fdb\u7a0b\u7684\u7528\u6237\u6001 tick（\u7d2f\u79ef）<\/td>\n<\/tr>\n
17<\/td>\ncstime<\/td>\n\u5df2\u9000\u51fa\u5b50\u8fdb\u7a0b\u7684\u5185\u6838\u6001 tick（\u7d2f\u79ef）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

process_time = utime + stime + cutime + cstime<\/p>\n

\n

\u56db\u3001\u5b8c\u6574\u8ba1\u7b97\u5b9e\u4f8b<\/h3>\n

\u7528\u4e00\u7ec4\u771f\u5b9e\u683c\u5f0f\u7684\u6570\u636e，\u4ece\u5934\u5230\u5c3e\u8d70\u4e00\u904d\u3002<\/p>\n

4.1 \u7b2c 1 \u6b21\u91c7\u6837<\/h4>\n

\u8bfb \/proc\/stat \u7b2c\u4e00\u884c：<\/p>\n

cpu 10132153 290696 3084719 46828483 16683 0 25195 0 0 0<\/p>\n

\u89e3\u6790：<\/p>\n

user=10132153 nice=290696 system=3084719 idle=46828483
\niowait=16683 irq=0 softirq=25195 steal=0<\/p>\n

total\u2081 = 10132153 + 290696 + 3084719 + 46828483 + 16683 + 0 + 25195 + 0
\n = 60,377,929<\/p>\n

idle\u2081 = 46,828,483<\/p>\n

\u540c\u65f6\u8bfb\u8fdb\u7a0b \/proc\/{pid}\/stat：<\/p>\n

utime=5000 stime=1200 cutime=0 cstime=0<\/p>\n

process_time\u2081 = 5000 + 1200 + 0 + 0 = 6,200<\/p>\n

4.2 \u7b49\u5f85 10 \u79d2，\u7b2c 2 \u6b21\u91c7\u6837<\/h4>\n

\u8bfb \/proc\/stat \u7b2c\u4e00\u884c：<\/p>\n

cpu 10132953 290720 3085019 46832083 16690 0 25210 0 0 0<\/p>\n

\u89e3\u6790：<\/p>\n

total\u2082 = 10132953 + 290720 + 3085019 + 46832083 + 16690 + 0 + 25210 + 0
\n = 60,382,675<\/p>\n

idle\u2082 = 46,832,083<\/p>\n

\u540c\u65f6\u8bfb\u8fdb\u7a0b \/proc\/{pid}\/stat：<\/p>\n

utime=5350 stime=1280 cutime=0 cstime=0<\/p>\n

process_time\u2082 = 5350 + 1280 + 0 + 0 = 6,630<\/p>\n

4.3 \u7b97\u5dee\u503c<\/h4>\n\n\u5b57\u6bb5\u7b2c 1 \u6b21\u7b2c 2 \u6b21\u5dee\u503c（\u0394）<\/tr>\n\n\n\n\n\n\n\n\n\n\n
user<\/td>\n10,132,153<\/td>\n10,132,953<\/td>\n800<\/td>\n<\/tr>\n
nice<\/td>\n290,696<\/td>\n290,720<\/td>\n24<\/td>\n<\/tr>\n
system<\/td>\n3,084,719<\/td>\n3,085,019<\/td>\n300<\/td>\n<\/tr>\n
idle<\/td>\n46,828,483<\/td>\n46,832,083<\/td>\n3,600<\/td>\n<\/tr>\n
iowait<\/td>\n16,683<\/td>\n16,690<\/td>\n7<\/td>\n<\/tr>\n
irq<\/td>\n0<\/td>\n0<\/td>\n0<\/td>\n<\/tr>\n
softirq<\/td>\n25,195<\/td>\n25,210<\/td>\n15<\/td>\n<\/tr>\n
steal<\/td>\n0<\/td>\n0<\/td>\n0<\/td>\n<\/tr>\n
total<\/td>\n60,377,929<\/td>\n60,382,675<\/td>\n4,746<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e3a\u4ec0\u4e48 10 \u79d2\u4ea7\u751f\u4e86 4746 \u4e2a tick？\u56e0\u4e3a 4 \u6838\u8bbe\u5907，\u6bcf\u4e2a\u6838\u6bcf\u79d2\u7ea6\u4ea7\u751f HZ \u4e2a tick（HZ\u2248100~120），4 \u00d7 ~119 \u00d7 10 \u2248 4746\u3002<\/p>\n

4.4 \u4ee3\u5165\u516c\u5f0f<\/h4>\n

\u6574\u673a CPU%：<\/p>\n

\u0394total = 4,746
\n\u0394idle = 3,600<\/p>\n

\u6574\u673a CPU% = (\u0394total \u2212 \u0394idle) \/ \u0394total \u00d7 100
\n = (4746 \u2212 3600) \/ 4746 \u00d7 100
\n = 1146 \/ 4746 \u00d7 100
\n \u2248 24.1%<\/p>\n

\u2192 \u8fc7\u53bb 10 \u79d2，4 \u4e2a\u6838\u5fc3\u603b\u5171\u6709 24.1% \u5728\u5e72\u6d3b，75.9% \u5728\u7a7a\u95f2\u3002<\/p>\n

\u7ec6\u5206\u4e00\u4e0b\u5404\u72b6\u6001\u5360\u6bd4：<\/p>\n

user \u5360\u6bd4 = 800 \/ 4746 \u00d7 100 = 16.9% \u2190 \u7528\u6237\u6001（App \u4ee3\u7801）
\nsystem \u5360\u6bd4 = 300 \/ 4746 \u00d7 100 = 6.3% \u2190 \u5185\u6838\u6001（\u7cfb\u7edf\u8c03\u7528）
\niowait \u5360\u6bd4 = 7 \/ 4746 \u00d7 100 = 0.1% \u2190 \u7b49 IO（\u51e0\u4e4e\u6ca1\u6709）
\nnice \u5360\u6bd4 = 24 \/ 4746 \u00d7 100 = 0.5%
\nsoftirq\u5360\u6bd4 = 15 \/ 4746 \u00d7 100 = 0.3%<\/p>\n

\u8fdb\u7a0b CPU%：<\/p>\n

\u0394process = 6630 \u2212 6200 = 430<\/p>\n

\u8fdb\u7a0b CPU% = \u0394process \/ \u0394total \u00d7 100
\n = 430 \/ 4746 \u00d7 100
\n \u2248 9.1%<\/p>\n

\u2192 \u8fd9\u4e2a\u8fdb\u7a0b\u5728\u8fc7\u53bb 10 \u79d2，\u6d88\u8017\u4e86\u6574\u673a CPU \u8d44\u6e90\u7684 9.1%\u3002<\/p>\n

4.5 \u4e00\u5f20\u56fe\u770b\u5168\u8c8c<\/h4>\n

\u0394total = 4,746 tick（10 \u79d2 \u00d7 4 \u6838）
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 \u2502
\n\u2502 \u250c\u2500\u2500 user = 800 \u2500\u2510 \u2502
\n\u2502 \u251c\u2500\u2500 nice = 24 \u2502 \u2502
\n\u2502 \u251c\u2500\u2500 system = 300 \u251c\u2500 \u5fd9\u788c = 1,146 (24.1%) \u2502
\n\u2502 \u251c\u2500\u2500 iowait = 7 \u2502 \u2502
\n\u2502 \u251c\u2500\u2500 softirq = 15 \u2502 \u2502
\n\u2502 \u251c\u2500\u2500 irq = 0 \u2518 \u2502
\n\u2502 \u2502 \u2502
\n\u2502 \u2514\u2500\u2500 idle = 3,600 \u2500\u2500 \u7a7a\u95f2 (75.9%) \u2502
\n\u2502 \u2502
\n\u2502 \u5176\u4e2d\u8fdb\u7a0b com.example.app \u6d88\u8017 430 tick = 9.1% \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

\n

\u4e94\u3001\u5e38\u89c1\u91c7\u96c6\u65b9\u5f0f\u5bf9\u6bd4<\/h3>\n

\u9664\u4e86\u76f4\u63a5\u8bfb \/proc\/stat，\u8fd8\u6709\u51e0\u79cd\u5e38\u89c1\u65b9\u5f0f，\u5b83\u4eec\u5e95\u5c42\u90fd\u5728\u7528\u540c\u6837\u7684\u516c\u5f0f：<\/p>\n\n\u7ef4\u5ea6\u76f4\u63a5\u8bfb \/proc\/stattop -n 1dumpsys cpuinfo<\/tr>\n\n\n\n\n\n\n\n\n
\u5e95\u5c42\u539f\u7406<\/td>\n\u5c31\u662f\u539f\u59cb\u6570\u636e\u6e90<\/td>\n\u5185\u90e8\u8bfb \/proc\/stat \u5e2e\u4f60\u7b97<\/td>\n\u901a\u8fc7 Binder \u5411 system_server \u53d6<\/td>\n<\/tr>\n
\u6570\u636e\u7cbe\u5ea6<\/td>\n\u6700\u9ad8（\u539f\u59cb tick）<\/td>\n\u4e2d（top \u81ea\u5df1\u7b97\u7684）<\/td>\n\u4f4e（\u7cfb\u7edf\u7edf\u8ba1\u7a97\u53e3\u4e0d\u7cbe\u786e）<\/td>\n<\/tr>\n
\u91c7\u96c6\u5f00\u9500<\/td>\n\u6700\u4f4e（2~3ms）<\/td>\n\u4e2d（50~200ms）<\/td>\n\u6700\u9ad8（100~500ms）<\/td>\n<\/tr>\n
\u9700\u8981\u81ea\u5df1\u7b97<\/td>\n\u662f<\/td>\n\u5426<\/td>\n\u5426<\/td>\n<\/tr>\n
\u8f93\u51fa\u683c\u5f0f\u7a33\u5b9a<\/td>\n\u662f（\u5185\u6838\u6807\u51c6\u683c\u5f0f）<\/td>\n\u5dee（\u5404\u7248\u672c\u4e0d\u540c）<\/td>\n\u4e2d<\/td>\n<\/tr>\n
\u9002\u5408\u9ad8\u9891\u91c7\u96c6<\/td>\n\u662f<\/td>\n\u4e0d\u63a8\u8350<\/td>\n\u5426<\/td>\n<\/tr>\n
\u9002\u5408\u624b\u52a8\u770b\u4e00\u773c<\/td>\n\u5426（\u539f\u59cb\u6570\u5b57）<\/td>\n\u662f<\/td>\n\u662f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5efa\u8bae：\u5199\u91c7\u96c6\u5de5\u5177 \u2192 \u76f4\u63a5\u8bfb \/proc\/stat；\u624b\u52a8\u5feb\u901f\u770b \u2192 \u7528 top \u6216 dumpsys cpuinfo\u3002<\/p>\n

\n

\u516d\u3001\u91c7\u96c6\u95f4\u9694\u4e0e\u7cbe\u5ea6<\/h3>\n

6.1 \u95f4\u9694\u9009\u62e9<\/h4>\n\n\u95f4\u9694\u9002\u7528\u573a\u666f\u6ce8\u610f\u4e8b\u9879<\/tr>\n\n\n\n\n
1~2 \u79d2<\/td>\n\u77ed\u65f6\u95f4\u7cbe\u7ec6\u5206\u6790（\u542f\u52a8\u3001\u9875\u9762\u5207\u6362）<\/td>\nADB \u91c7\u96c6\u5f00\u9500\u5360\u6bd4\u9ad8，\u5efa\u8bae\u8bbe\u5907\u7aef\u811a\u672c<\/td>\n<\/tr>\n
5~10 \u79d2<\/td>\n\u957f\u65f6\u95f4\u538b\u6d4b（\u63a8\u8350）<\/td>\n\u5e73\u8861\u7cbe\u5ea6\u548c\u5f00\u9500<\/td>\n<\/tr>\n
30~60 \u79d2<\/td>\n\u7c97\u7c92\u5ea6\u76d1\u63a7<\/td>\n\u53ef\u80fd\u6f0f\u6389\u77ed\u6682\u7684 CPU \u98d9\u5347<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5e38\u7528\u9009\u62e9\u662f 10 \u79d2\u2014\u201424 \u5c0f\u65f6\u538b\u6d4b\u4ea7\u751f 8640 \u4e2a\u6570\u636e\u70b9，\u591f\u505a\u8d8b\u52bf\u5206\u6790，\u53c8\u4e0d\u4f1a\u5e72\u6270\u8bbe\u5907\u3002<\/p>\n

6.2 tick \u7cbe\u5ea6：CONFIG_HZ<\/h4>\n

\/proc\/stat \u91cc\u7684\u6570\u503c\u5355\u4f4d\u662f tick\u3002\u6bcf\u4e2a tick \u7684\u65f6\u957f\u53d6\u51b3\u4e8e\u5185\u6838\u7f16\u8bd1\u65f6\u7684 CONFIG_HZ：<\/p>\n\nCONFIG_HZ\u6bcf tick \u65f6\u957f\u5e38\u89c1\u5e73\u53f0<\/tr>\n\n\n\n\n\n
100<\/td>\n10ms<\/td>\n\u90e8\u5206\u65e7\u5185\u6838<\/td>\n<\/tr>\n
250<\/td>\n4ms<\/td>\nMTK \u5e73\u53f0\u5e38\u89c1<\/td>\n<\/tr>\n
300<\/td>\n3.3ms<\/td>\n\u90e8\u5206\u9ad8\u901a\u5e73\u53f0<\/td>\n<\/tr>\n
1000<\/td>\n1ms<\/td>\n\u670d\u52a1\u5668\/\u684c\u9762 Linux<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u53ef\u901a\u8fc7 adb shell getconf CLK_TCK \u67e5\u770b\u8bbe\u5907\u7684 HZ \u503c\u3002<\/p>\n

HZ=100 \u65f6，\u4e00\u4e2a\u8fd0\u884c\u4e86 5ms \u7684\u77ed\u4efb\u52a1\u53ef\u80fd\u4e0d\u4f1a\u88ab\u8bb0\u5f55（\u4e0d\u5230 1 tick）\u3002\u5bf9\u5927\u90e8\u5206\u6027\u80fd\u6d4b\u8bd5\u573a\u666f（\u95f4\u9694 \u2265 5 \u79d2），\u8fd9\u4e2a\u7cbe\u5ea6\u9650\u5236\u53ef\u4ee5\u5ffd\u7565\u3002<\/p>\n

\n

\u4e03\u3001\u5b8c\u6574\u91c7\u96c6\u6d41\u7a0b<\/h3>\n

\u628a\u524d\u9762\u7684\u5185\u5bb9\u4e32\u8d77\u6765，\u4e00\u6b21\u5b8c\u6574\u7684 CPU \u91c7\u96c6\u5206\u4e09\u6b65：<\/p>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Step 1：\u7b2c 1 \u6b21\u91c7\u6837 \u2502
\n\u2502 \u2502
\n\u2502 \u00b7 \u8bfb \/proc\/stat \u2192 \u53d6\u7b2c\u4e00\u884c \u2502
\n\u2502 \u2192 \u89e3\u6790 8 \u4e2a\u5b57\u6bb5 \u2502
\n\u2502 \u2192 total\u2081 = 8 \u4e2a\u5b57\u6bb5\u4e4b\u548c \u2502
\n\u2502 \u2192 idle\u2081 = \u7b2c 4 \u4e2a\u5b57\u6bb5 \u2502
\n\u2502 \u2502
\n\u2502 \u00b7 \u8bfb \/proc\/{pid}\/stat \u2502
\n\u2502 \u2192 \u53d6\u7b2c 14~17 \u5b57\u6bb5 \u2502
\n\u2502 \u2192 process_time\u2081 = utime + stime + cutime + cstime \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2502
\n \u2502 \u7b49\u5f85 N \u79d2（\u63a8\u8350 10 \u79d2）
\n \u25bc
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Step 2：\u7b2c 2 \u6b21\u91c7\u6837（\u540c\u6837\u6b65\u9aa4） \u2502
\n\u2502 \u2502
\n\u2502 \u2192 total\u2082, idle\u2082, process_time\u2082 \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2502
\n \u25bc
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Step 3：\u4ee3\u5165\u516c\u5f0f \u2502
\n\u2502 \u2502
\n\u2502 \u0394total = total\u2082 \u2212 total\u2081 \u2502
\n\u2502 \u0394idle = idle\u2082 \u2212 idle\u2081 \u2502
\n\u2502 \u0394process = process_time\u2082 \u2212 process_time\u2081 \u2502
\n\u2502 \u2502
\n\u2502 \u6574\u673a CPU% = (\u0394total \u2212 \u0394idle) \/ \u0394total \u00d7 100 \u2502
\n\u2502 \u8fdb\u7a0b CPU% = \u0394process \/ \u0394total \u00d7 100 \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

\n

\u5c0f\u7ed3<\/h3>\n\n\u77e5\u8bc6\u70b9\u4e00\u53e5\u8bdd<\/tr>\n\n\n\n\n\n\n\n\n\n
CPU% \u7684\u672c\u8d28<\/td>\n\u975e\u7a7a\u95f2 tick \u5360\u603b tick \u7684\u6bd4\u4f8b<\/td>\n<\/tr>\n
\u6838\u5fc3\u516c\u5f0f<\/td>\n\u6574\u673a (\u0394total\u2212\u0394idle)\/\u0394total，\u8fdb\u7a0b \u0394process\/\u0394total<\/td>\n<\/tr>\n
\u6574\u673a\u6570\u636e\u6e90<\/td>\n\/proc\/stat \u7b2c\u4e00\u884c（\u6c47\u603b\u884c，\u4e0d\u9700\u8981\u624b\u52a8\u52a0\u5404\u6838）<\/td>\n<\/tr>\n
\u8fdb\u7a0b\u6570\u636e\u6e90<\/td>\n\/proc\/{pid}\/stat \u7b2c 14~17 \u5b57\u6bb5<\/td>\n<\/tr>\n
total \u600e\u4e48\u7b97<\/td>\n\u6c47\u603b\u884c 8 \u4e2a\u6570\u503c\u5b57\u6bb5\u5168\u90e8\u76f8\u52a0<\/td>\n<\/tr>\n
\u63a8\u8350\u91c7\u96c6\u65b9\u5f0f<\/td>\n\u76f4\u63a5\u8bfb \/proc\/stat，\u4e0d\u7528 top \/ dumpsys<\/td>\n<\/tr>\n
\u63a8\u8350\u91c7\u96c6\u95f4\u9694<\/td>\n10 \u79d2（\u957f\u65f6\u95f4\u538b\u6d4b）<\/td>\n<\/tr>\n
\u7cbe\u5ea6\u4e0a\u9650<\/td>\nCONFIG_HZ \u51b3\u5b9a，\u901a\u5e38 4~10ms<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u638c\u63e1\u4e86\u8fd9\u4e9b\u57fa\u7840，\u4f60\u5c31\u80fd\u770b\u61c2\u4efb\u4f55 CPU \u91c7\u96c6\u5de5\u5177\u7684\u539f\u7406\u4e86\u3002\u4e0b\u4e00\u7bc7\u6211\u4eec\u8bb2\u8fd9\u4e2a"\u7b80\u5355\u516c\u5f0f"\u91cc\u85cf\u7740\u7684 8 \u4e2a\u5751\u2014\u2014\u6bcf\u4e2a\u90fd\u53ef\u80fd\u8ba9\u4f60\u7684\u6570\u636e\u4e25\u91cd\u5931\u771f\u3002<\/p>\n

\u63d0\u793a：\u672c\u7bc7\u8bb2\u7684 CPU% \u8861\u91cf\u7684\u662f"\u65f6\u95f4\u7247\u5360\u6bd4"（Raw CPU%）\u3002\u8bbe\u5907\u964d\u9891\u65f6，\u540c\u6837\u7684 CPU% \u5bf9\u5e94\u7684\u5b9e\u9645\u7b97\u529b\u4f1a\u5927\u5e45\u7f29\u6c34\u3002\u8fd9\u4e2a\u95ee\u9898\u4ee5\u53ca\u5bf9\u5e94\u7684 Normalized CPU% \u65b9\u6848，\u4f1a\u5728\u7b2c 7 \u7bc7\u548c\u7b2c 8 \u7bc7\u5c55\u5f00\u3002<\/p>\n

\n

\u7cfb\u5217\u76ee\u5f55<\/p>\n

    \n
  • \u7b2c 1 \u7bc7：\u5185\u5b58\u6cc4\u6f0f\u81ea\u52a8\u68c0\u6d4b（\u4e0a）\u2014\u2014\u91c7\u96c6\u5c42\u8bbe\u8ba1<\/li>\n
  • \u7b2c 2 \u7bc7：\u5185\u5b58\u6cc4\u6f0f\u81ea\u52a8\u68c0\u6d4b（\u4e2d）\u2014\u2014\u68c0\u6d4b\u5c42\u8bbe\u8ba1<\/li>\n
  • \u7b2c 3 \u7bc7：\u5185\u5b58\u6cc4\u6f0f\u81ea\u52a8\u68c0\u6d4b（\u4e0b）\u2014\u2014\u54cd\u5e94\u5c42\u8bbe\u8ba1<\/li>\n
  • \u7b2c 4 \u7bc7：Android \u5185\u5b58\u91c7\u96c6\u907f\u5751\u6307\u5357<\/li>\n
  • \u7b2c 5 \u7bc7（\u672c\u7bc7）：Android CPU \u4f7f\u7528\u7387\u91c7\u96c6\u5165\u95e8<\/li>\n
  • \u7b2c 6 \u7bc7（\u4e0b\u4e00\u7bc7）：CPU \u91c7\u96c6\u7684 8 \u4e2a\u5751<\/li>\n
  • \u7b2c 7 \u7bc7：CPU \u964d\u9891\u4e86，\u4f60\u7684\u91c7\u96c6\u6570\u636e\u8fd8\u51c6\u5417？<\/li>\n
  • \u7b2c 8 \u7bc7：CPU \u5355\u6838\u5206\u6790\u4e0e\u5f52\u4e00\u5316\u65b9\u6848<\/li>\n<\/ul>\n
    \n

    \u6211\u662f\u6d4b\u8bd5\u5de5\u574a，\u4e13\u6ce8 Android \u7cfb\u7edf\u7ea7\u6027\u80fd\u5de5\u7a0b\u3002 \u5982\u679c\u4f60\u4e5f\u5728\u505a CPU \u76f8\u5173\u7684\u6027\u80fd\u6d4b\u8bd5，\u6b22\u8fce\u8bc4\u8bba\u533a\u4ea4\u6d41 👇 \u5173\u6ce8\u6211，\u540e\u7eed\u66f4\u65b0\u4e0d\u8ff7\u8def\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u505a Android \u6027\u80fd\u6d4b\u8bd5，CPU \u4f7f\u7528\u7387\u662f\u6700\u57fa\u7840\u7684\u6307\u6807\u3002\u4f46\u5f88\u591a\u4eba\u53ea\u4f1a\u7528 top \u770b\u4e00\u773c，\u5bf9\u80cc\u540e\u7684\u6570\u636e\u6e90\u548c\u8ba1\u7b97\u903b\u8f91\u5e76\u4e0d\u6e05\u695a\u3002 \u672c\u7bc7\u4ece\u6982\u5ff5\u8bb2\u8d77，\u5148\u7ed9\u516c\u5f0f\u3001\u518d\u770b\u6570\u636e\u6e90\u3001\u6700\u540e\u7528\u771f\u5b9e\u6570\u636e\u8d70\u4e00\u904d\u5b8c\u6574\u8ba1\u7b97\u3002 \u4e00\u3001CPU \u4f7f\u7528\u7387\u5230\u5e95\u5728\u5ea6\u91cf\u4ec0\u4e48
    \n\u5148\u660e\u786e\u4e00\u4e2a\u6982\u5ff5：CPU \u4f7f\u7528\u7387\u8861\u91cf\u7684\u662f\\”\u65f6\u95f4\u7247\u7684\u5206\u914d\u6bd4\u4f8b\\”，\u4e0d\u662f\\”\u7b97\u529b\u7684\u6d88\u8017\u6bd4\u4f8b\\”\u3002
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