设备环境：物理机 CPU：E5-2680V4@2.4G 14核心28线程； RAM：2*16GB = 32GB；GPU：Tesla P4
BUG现象：
1、表面看人脸识别很慢
2、经过跟踪，发现是imagesrv服务，实际只有两个线程在工作（实际占用CPU），其它线程都不工作（不占用CPU）。由此出现的问题是，日志中出现大量的cropping超时告警。而GPU的人脸识别在等待imagesrv的图象处理结果，因此表面看是人脸识别慢。具体见 案例。
[11 15:39:11.858] [warning] [4323] [PERF]Slow request, req id:32a9813a4d0a0b73, method:com.trim.imagesrv.cropping, cost:50016
[11 15:39:20.399] [warning] [4322] [PERF]Slow request, req id:f00c5bea7ec3ac78, method:com.trim.imagesrv.cropping, cost:30945
[11 15:45:58.031] [warning] [4322] [PERF]Slow request, req id:0fb7dedce57ea189, method:com.trim.imagesrv.cropping, cost:15721
[11 16:44:20.730] [warning] [213442] [PERF]Slow request, req id:bf5dc8e64ca5b1d5, method:com.trim.imagesrv.cropping, cost:45240
[13 10:21:33.712] [warning] [31414] [PERF]Slow request, req id:b2ac8c080a3f43a4, method:com.trim.imagesrv.cropping, cost:2754
[13 10:21:42.473] [warning] [31413] [PERF]Slow request, req id:d4fb24ec2e2d364d, method:com.trim.imagesrv.cropping, cost:3878
[13 10:21:49.568] [warning] [31413] [PERF]Slow request, req id:52d82f68b1505430, method:com.trim.imagesrv.cropping, cost:3977
[13 10:22:03.712] [warning] [31414] [PERF]Slow request, req id:df8c92bc8a893d16, method:com.trim.imagesrv.cropping, cost:1071
[13 10:22:42.483] [warning] [31414] [PERF]Slow request, req id:845acc6871da820f, method:com.trim.imagesrv.cropping, cost:1534
[13 10:22:56.043] [warning] [31414] [PERF]Slow request, req id:b2227ebfeaaf31de, method:com.trim.imagesrv.cropping, cost:1833
[13 10:23:10.427] [warning] [31413] [PERF]Slow request, req id:98154ce0917fff76, method:com.trim.imagesrv.cropping, cost:1212
[13 10:23:30.939] [warning] [31414] [PERF]Slow request, req id:53ef033414cbe91c, method:com.trim.imagesrv.cropping, cost:1482
[13 10:24:15.184] [warning] [31413] [PERF]Slow request, req id:8e64f517bec92410, method:com.trim.imagesrv.cropping, cost:2770
[13 10:25:34.923] [warning] [31413] [PERF]Slow request, req id:84a1894850ce0b14, method:com.trim.imagesrv.cropping, cost:2051
[13 10:26:12.968] [warning] [31414] [PERF]Slow request, req id:633a9910aaf2f61c, method:com.trim.imagesrv.cropping, cost:1946
[13 10:26:50.849] [warning] [31413] [PERF]Slow request, req id:c6a4da7c284ca0ce, method:com.trim.imagesrv.cropping, cost:2923
[13 10:27:14.130] [warning] [31414] [PERF]Slow request, req id:090bcd043251833d, method:com.trim.imagesrv.cropping, cost:1322
[13 10:27:29.953] [warning] [31414] [PERF]Slow request, req id:33311795fa0c3deb, method:com.trim.imagesrv.cropping, cost:3035
[13 10:27:43.208] [warning] [31413] [PERF]Slow request, req id:ca512f86fafddecb, method:com.trim.imagesrv.cropping, cost:1195
出现频率：对有多个人脸的图片，须经过cropping操作。因此该问题是必现。作为对比在1700X+1070ti上出现的概率很小，因为1700X的单核性能远高于E5 2680的单核性能。
优化改进建议：
1、（代价小）增大imagesrv的实际处理线程数，根据CPU的核心数/线程数进行调整；或者imagesrv支持多进程运行（目前不支持）；两者有配置参数进行配置更好。
特别是对单核性能较差的多核CPU（如E5服务器CPU）更应增大线程数量，充分利用其多核能力；当然如果能针对这类服务器CPU进行进一步优化（比如比较大的cache等）更好，但可能投入产出没有直接增大线程数更好。
2、比较好的解决办法：直接调用GPU的能力来进行cropping等图象操作。
2026-3-13 15:19:01
