### openEuler [root@ ~]$ sar -u ALL 1 Linux 5.10.0-60.18.0.50.oe2203.x86_64 (openEuler-2203) 01/06/2023 _x86_64_ (40 CPU) 10:22:28 AM CPU %usr %nice %sys %iowait %steal %irq %soft %guest %gnice %idle 10:22:29 AM all 64.58 0.00 12.20 0.00 0.00 1.20 5.54 0.00 0.00 16.48 10:22:30 AM all 64.62 0.00 12.40 0.00 0.00 1.15 5.51 0.00 0.00 16.33 10:22:31 AM all 64.83 0.00 12.19 0.00 0.00 1.25 5.40 0.00 0.00 16.34 10:22:32 AM all 64.86 0.00 12.14 0.00 0.00 1.20 5.61 0.00 0.00 16.19 10:22:33 AM all 65.25 0.00 12.26 0.00 0.00 1.09 5.55 0.00 0.00 15.85 10:22:34 AM all 65.36 0.00 12.01 0.00 0.00 1.38 5.51 0.00 0.00 15.75 10:22:35 AM all 64.99 0.00 12.60 0.00 0.00 1.07 5.67 0.00 0.00 15.67 10:22:36 AM all 65.26 0.00 12.30 0.00 0.00 1.15 5.59 0.00 0.00 15.70 10:22:37 AM all 64.92 0.00 12.35 0.00 0.00 1.37 5.63 0.00 0.00 15.73 10:22:38 AM all 65.09 0.00 12.48 0.00 0.00 1.18 5.60 0.00 0.00 15.65 10:22:39 AM all 65.48 0.00 12.17 0.00 0.00 1.15 5.51 0.00 0.00 15.69 10:22:40 AM all 65.27 0.00 12.05 0.00 0.00 1.20 5.78 0.00 0.00 15.69 10:22:41 AM all 65.14 0.00 12.29 0.00 0.00 1.25 5.48 0.00 0.00 15.84 10:22:42 AM all 65.24 0.00 12.09 0.00 0.00 1.28 5.73 0.00 0.00 15.67 ### Centos 6.6 [root@ ~]$ sar -u ALL 1 Linux 2.6.32-696.10.2.el6.x86_64 (Centos6_mysql_test) 01/06/2023 _x86_64_ (40 CPU) 10:23:31 AM CPU %usr %nice %sys %iowait %steal %irq %soft %guest %gnice %idle 10:23:32 AM all 63.10 0.00 6.14 0.03 0.00 0.00 3.59 0.00 0.00 27.14 10:23:33 AM all 63.39 0.00 6.33 0.00 0.00 0.00 3.60 0.00 0.00 26.68 10:23:34 AM all 63.09 0.00 6.16 0.00 0.00 0.00 3.49 0.00 0.00 27.27 10:23:35 AM all 63.51 0.00 6.32 0.00 0.00 0.00 3.70 0.00 0.00 26.47 10:23:36 AM all 62.68 0.00 6.18 0.00 0.00 0.00 3.45 0.00 0.00 27.70 10:23:37 AM all 63.30 0.00 6.05 0.00 0.00 0.00 3.43 0.00 0.00 27.22 10:23:38 AM all 63.37 0.00 6.51 0.03 0.00 0.00 3.56 0.00 0.00 26.54 10:23:39 AM all 64.20 0.00 5.91 0.00 0.00 0.03 3.49 0.00 0.00 26.38 10:23:40 AM all 63.46 0.00 6.19 0.00 0.00 0.00 3.58 0.00 0.00 26.77 10:23:41 AM all 63.70 0.00 5.97 0.03 0.00 0.00 3.52 0.00 0.00 26.79 10:23:42 AM all 63.47 0.00 6.07 0.00 0.00 0.00 3.47 0.00 0.00 26.99 10:23:43 AM all 63.49 0.00 6.55 0.00 0.00 0.00 3.55 0.00 0.00 26.41 10:23:44 AM all 63.73 0.00 5.90 0.00 0.00 0.00 3.52 0.00 0.00 26.85 10:23:45 AM all 63.18 0.00 6.31 0.03 0.00 0.00 3.50 0.00 0.00 26.99 10:23:46 AM all 62.90 0.00 6.50 0.00 0.00 0.00 3.67 0.00 0.00 26.94
如上数据，相同硬件配置下，用MySQL压测，CPU SYSTEM表现不太正常。
innodb_buffer_pool_size=214748364800（200GB） innodb_buffer_pool_instances=16 innodb_io_capacity=20000 sync_binlog = 0 innodb_flush_log_at_trx_commit = 2 innodb_flush_method = O_DIRECT innodb_read_io_threads=8 innodb_write_io_threads=8 innodb_page_cleaners=8 innodb_doublewrite innodb_use_native_aio `# MySQL 5.7.34` `# malloc = tcmalloc-2.6.3` `# sysbench 1.0.17` `# 48并发压测` `# DB 大小：200GB（32张表，每张表 1千万行）`
有人碰到过类似的情况吗？从perf火焰图里面，看不出有很大的差异。