如何解决由php7造成的高负载

我们升级到php7（这只是服务器的变化），这是造成CPU的高负载。

仙人掌图

sar output 04:40:01 AM CPU %user %nice %system %iowait %steal %idle 04:50:01 AM all 2.85 0.00 2.13 0.01 0.00 95.01 04:50:01 AM 0 4.53 0.00 8.41 0.03 0.00 87.03 04:50:01 AM 1 24.64 0.00 3.93 0.01 0.00 71.43 04:50:01 AM 2 9.01 0.00 4.28 0.00 0.00 86.71 04:50:01 AM 3 3.89 0.00 2.23 0.00 0.00 93.87 04:50:01 AM 4 0.49 0.00 0.20 0.00 0.00 99.31 04:50:01 AM 5 0.38 0.00 0.79 0.00 0.00 98.83 04:50:01 AM 6 5.15 0.00 13.87 0.04 0.00 80.94 04:50:01 AM 7 1.18 0.00 5.05 0.00 0.00 93.76 04:50:01 AM 8 0.61 0.00 1.94 0.00 0.00 97.45 04:50:01 AM 9 0.37 0.00 1.33 0.00 0.00 98.30 04:50:01 AM 10 0.05 0.00 0.30 0.00 0.00 99.64 04:50:01 AM 11 0.11 0.00 0.03 0.00 0.00 99.85 04:50:01 AM 12 13.35 0.00 2.62 0.02 0.00 84.00 04:50:01 AM 13 0.98 0.00 0.24 0.00 0.00 98.78 04:50:01 AM 14 0.59 0.00 0.36 0.00 0.00 99.05 04:50:01 AM 15 0.24 0.00 0.13 0.00 0.00 99.63 04:50:01 AM 16 0.24 0.00 0.14 0.00 0.00 99.62 04:50:01 AM 17 0.03 0.00 0.03 0.00 0.00 99.94 04:50:01 AM 18 0.99 0.00 3.73 0.02 0.00 95.27 04:50:01 AM 19 0.37 0.00 0.54 0.00 0.00 99.09 04:50:01 AM 20 0.62 0.00 0.56 0.00 0.00 98.82 04:50:01 AM 21 0.24 0.00 0.28 0.00 0.00 99.48 04:50:01 AM 22 0.29 0.00 0.21 0.00 0.00 99.49 04:50:01 AM 23 0.07 0.00 0.07 0.00 0.00 99.87 04:50:01 AM CPU %user %nice %system %iowait %steal %idle 05:00:01 AM all 5.66 0.00 2.19 0.01 0.00 92.13 05:00:01 AM 0 7.73 0.00 7.75 0.05 0.00 84.47 05:00:01 AM 1 49.79 0.00 8.65 0.00 0.00 41.55 05:00:01 AM 2 25.74 0.00 5.77 0.00 0.00 68.50 05:00:01 AM 3 4.95 0.00 1.42 0.00 0.00 93.63 05:00:01 AM 4 1.89 0.00 1.69 0.00 0.00 96.42 05:00:01 AM 5 0.38 0.00 0.97 0.00 0.00 98.65 05:00:01 AM 6 9.79 0.00 3.96 0.10 0.00 86.15 05:00:01 AM 7 2.09 0.00 5.39 0.02 0.00 92.50 05:00:01 AM 8 0.31 0.00 0.24 0.01 0.00 99.44 05:00:01 AM 9 0.76 0.00 1.08 0.00 0.00 98.16 05:00:01 AM 10 0.02 0.00 0.13 0.01 0.00 99.84 05:00:01 AM 11 0.33 0.00 1.33 0.00 0.00 98.34 05:00:01 AM 12 25.21 0.00 3.81 0.02 0.00 70.96 05:00:01 AM 13 0.90 0.00 0.66 0.00 0.00 98.44 05:00:01 AM 14 0.67 0.00 0.76 0.05 0.00 98.52 05:00:01 AM 15 0.31 0.00 0.27 0.00 0.00 99.42 05:00:01 AM 16 0.28 0.00 0.26 0.00 0.00 99.46 05:00:01 AM 17 0.12 0.00 0.18 0.00 0.00 99.69 05:00:01 AM 18 1.24 0.00 5.03 0.04 0.00 93.69 05:00:01 AM 19 0.89 0.00 0.87 0.03 0.00 98.20 05:00:01 AM 20 1.74 0.00 1.23 0.00 0.00 97.02 05:00:01 AM 21 0.44 0.00 0.42 0.00 0.00 99.14 05:00:01 AM 22 0.38 0.00 0.45 0.00 0.00 99.17 05:00:01 AM 23 0.09 0.00 0.47 0.00 0.00 99.44 05:00:01 AM CPU %user %nice %system %iowait %steal %idle 05:10:01 AM all 6.16 0.00 1.64 0.02 0.00 92.18 05:10:01 AM 0 6.03 0.00 5.99 0.09 0.00 87.90 05:10:01 AM 1 48.29 0.00 7.89 0.00 0.00 43.81 05:10:01 AM 2 30.24 0.00 5.09 0.00 0.00 64.67 05:10:01 AM 3 9.02 0.00 1.20 0.00 0.00 89.77 05:10:01 AM 4 2.13 0.00 0.36 0.00 0.00 97.51 05:10:01 AM 5 0.54 0.00 0.16 0.00 0.00 99.30 05:10:01 AM 6 10.47 0.00 5.23 0.15 0.00 84.15 05:10:01 AM 7 1.90 0.00 1.13 0.02 0.00 96.95 05:10:01 AM 8 0.66 0.00 1.85 0.01 0.00 97.47 05:10:01 AM 9 0.26 0.00 0.13 0.00 0.00 99.61 05:10:01 AM 10 0.02 0.00 0.08 0.00 0.00 99.90 05:10:01 AM 11 0.01 0.00 0.08 0.00 0.00 99.92 05:10:01 AM 12 28.45 0.00 3.41 0.06 0.00 68.09 05:10:01 AM 13 1.60 0.00 0.73 0.00 0.00 97.67 05:10:01 AM 14 0.55 0.00 0.67 0.00 0.00 98.78 05:10:01 AM 15 0.66 0.00 0.24 0.00 0.00 99.09 05:10:01 AM 16 0.44 0.00 0.18 0.00 0.00 99.39 05:10:01 AM 17 0.19 0.00 0.12 0.00 0.00 99.69 05:10:01 AM 18 0.39 0.00 0.53 0.03 0.00 99.05 05:10:01 AM 19 2.51 0.00 1.42 0.00 0.00 96.07 05:10:01 AM 20 1.11 0.00 1.15 0.00 0.00 97.74 05:10:01 AM 21 1.99 0.00 1.25 0.00 0.00 96.76 05:10:01 AM 22 0.35 0.00 0.35 0.00 0.00 99.29 05:10:01 AM 23 0.22 0.00 0.34 0.01 0.00 99.44 05:10:01 AM CPU %user %nice %system %iowait %steal %idle 05:20:01 AM all 4.02 0.00 12.27 0.01 0.00 83.69 05:20:01 AM 0 7.35 0.00 18.25 0.02 0.00 74.38 05:20:01 AM 1 11.90 0.00 31.41 0.05 0.00 56.64 05:20:01 AM 2 6.57 0.00 25.74 0.00 0.00 67.68 05:20:01 AM 3 3.52 0.00 19.25 0.00 0.00 77.23 05:20:01 AM 4 2.58 0.00 16.29 0.00 0.00 81.14 05:20:01 AM 5 2.12 0.00 12.28 0.02 0.00 85.58 05:20:01 AM 6 12.51 0.00 25.54 0.06 0.00 61.88 05:20:01 AM 7 4.24 0.00 16.93 0.00 0.00 78.82 05:20:01 AM 8 3.75 0.00 8.85 0.01 0.00 87.40 05:20:01 AM 9 2.45 0.00 5.40 0.01 0.00 92.15 05:20:01 AM 10 2.79 0.00 4.57 0.00 0.00 92.64 05:20:01 AM 11 1.00 0.00 5.14 0.00 0.00 93.86 05:20:01 AM 12 5.14 0.00 19.32 0.02 0.00 75.52 05:20:01 AM 13 2.28 0.00 16.37 0.00 0.00 81.35 05:20:01 AM 14 1.26 0.00 11.01 0.00 0.00 87.73 05:20:01 AM 15 0.80 0.00 8.60 0.00 0.00 90.60 05:20:01 AM 16 0.93 0.00 5.01 0.00 0.00 94.06 05:20:01 AM 17 1.41 0.00 4.92 0.00 0.00 93.67 05:20:01 AM 18 6.21 0.00 12.08 0.04 0.00 81.67 05:20:01 AM 19 4.66 0.00 7.26 0.00 0.00 88.08 05:20:01 AM 20 0.70 0.00 4.83 0.00 0.00 94.47 05:20:01 AM 21 5.03 0.00 5.96 0.00 0.00 89.00 05:20:01 AM 22 7.01 0.00 5.47 0.00 0.00 87.52 05:20:01 AM 23 0.30 0.00 4.15 0.00 0.00 95.55 05:20:01 AM CPU %user %nice %system %iowait %steal %idle 05:30:01 AM all 4.34 0.00 11.07 0.01 0.00 84.58 05:30:01 AM 0 5.33 0.00 16.49 0.02 0.00 78.17 05:30:01 AM 1 17.19 0.00 33.85 0.03 0.00 48.93 05:30:01 AM 2 11.77 0.00 25.47 0.00 0.00 62.76 05:30:01 AM 3 5.08 0.00 21.68 0.00 0.00 73.23 05:30:01 AM 4 6.13 0.00 14.52 0.00 0.00 79.35 05:30:01 AM 5 2.06 0.00 11.81 0.00 0.00 86.13 05:30:01 AM 6 16.30 0.00 26.25 0.03 0.00 57.42 05:30:01 AM 7 3.80 0.00 17.13 0.01 0.00 79.06 05:30:01 AM 8 4.56 0.00 7.31 0.00 0.00 88.13 05:30:01 AM 9 0.11 0.00 2.77 0.01 0.00 97.11 05:30:01 AM 10 0.51 0.00 2.72 0.00 0.00 96.77 05:30:01 AM 11 4.69 0.00 2.10 0.00 0.00 93.21 05:30:01 AM 12 8.04 0.00 20.36 0.02 0.00 71.58 05:30:01 AM 13 1.30 0.00 12.20 0.00 0.00 86.50 05:30:01 AM 14 3.16 0.00 9.36 0.00 0.00 87.47 05:30:01 AM 15 0.51 0.00 4.93 0.01 0.00 94.55 05:30:01 AM 16 0.47 0.00 4.21 0.00 0.00 95.32 05:30:01 AM 17 0.43 0.00 3.02 0.00 0.00 96.55 05:30:01 AM 18 6.61 0.00 14.71 0.02 0.00 78.66 05:30:01 AM 19 3.60 0.00 6.18 0.00 0.00 90.22 05:30:01 AM 20 1.95 0.00 3.81 0.00 0.00 94.24 05:30:01 AM 21 0.46 0.00 2.55 0.00 0.00 96.99 05:30:01 AM 22 0.12 0.00 1.47 0.00 0.00 98.41 05:30:01 AM 23 0.13 0.00 0.88 0.00 0.00 98.99 05:30:01 AM CPU %user %nice %system %iowait %steal %idle 05:40:02 AM all 3.23 0.00 14.96 0.02 0.00 81.80 05:40:02 AM 0 5.70 0.00 21.45 0.18 0.00 72.67 05:40:02 AM 1 18.01 0.00 39.59 0.01 0.00 42.39 05:40:02 AM 2 9.73 0.00 33.71 0.01 0.00 56.55 05:40:02 AM 3 6.22 0.00 27.88 0.01 0.00 65.90 05:40:02 AM 4 2.83 0.00 20.78 0.00 0.00 76.39 05:40:02 AM 5 2.48 0.00 14.93 0.01 0.00 82.57 05:40:02 AM 6 5.30 0.00 35.07 0.05 0.00 59.57 05:40:02 AM 7 1.29 0.00 22.27 0.00 0.00 76.44 05:40:02 AM 8 0.77 0.00 9.50 0.00 0.00 89.73 05:40:02 AM 9 1.67 0.00 6.24 0.00 0.00 92.09 05:40:02 AM 10 0.88 0.00 4.54 0.00 0.00 94.59 05:40:02 AM 11 1.10 0.00 4.21 0.00 0.00 94.69 05:40:02 AM 12 9.25 0.00 26.51 0.01 0.00 64.23 05:40:02 AM 13 2.30 0.00 15.82 0.00 0.00 81.87 05:40:02 AM 14 1.31 0.00 11.75 0.00 0.00 86.94 05:40:02 AM 15 0.66 0.00 10.17 0.00 0.00 89.18 05:40:02 AM 16 1.17 0.00 5.83 0.00 0.00 93.01 05:40:02 AM 17 0.60 0.00 4.94 0.00 0.00 94.46 05:40:02 AM 18 2.62 0.00 20.10 0.12 0.00 77.16 05:40:02 AM 19 0.83 0.00 9.10 0.00 0.00 90.08 05:40:02 AM 20 0.75 0.00 5.42 0.00 0.00 93.82 05:40:02 AM 21 1.04 0.00 3.14 0.00 0.00 95.82 05:40:02 AM 22 0.28 0.00 2.73 0.00 0.00 96.99 05:40:02 AM 23 0.67 0.00 3.34 0.00 0.00 95.99 05:40:02 AM CPU %user %nice %system %iowait %steal %idle 05:50:01 AM all 2.28 0.00 11.49 0.04 0.00 86.19 05:50:01 AM 0 3.58 0.00 16.41 0.03 0.00 79.98 05:50:01 AM 1 14.45 0.00 32.73 0.01 0.00 52.82 05:50:01 AM 2 7.32 0.00 25.51 0.02 0.00 67.15 05:50:01 AM 3 3.46 0.00 20.23 0.00 0.00 76.31 05:50:01 AM 4 2.44 0.00 12.95 0.01 0.00 84.60 05:50:01 AM 5 1.33 0.00 12.12 0.00 0.00 86.55 05:50:01 AM 6 4.11 0.00 29.63 0.46 0.00 65.80 05:50:01 AM 7 1.67 0.00 14.28 0.06 0.00 83.99 05:50:01 AM 8 0.58 0.00 4.48 0.01 0.00 94.92 05:50:01 AM 9 0.24 0.00 4.33 0.02 0.00 95.41 05:50:01 AM 10 0.07 0.00 1.87 0.00 0.00 98.05 05:50:01 AM 11 0.08 0.00 1.36 0.00 0.00 98.55 05:50:01 AM 12 7.46 0.00 19.27 0.01 0.00 73.27 05:50:01 AM 13 1.08 0.00 13.72 0.00 0.00 85.20 05:50:01 AM 14 0.71 0.00 10.76 0.02 0.00 88.51 05:50:01 AM 15 0.66 0.00 7.16 0.01 0.00 92.17 05:50:01 AM 16 0.36 0.00 4.58 0.00 0.00 95.06 05:50:01 AM 17 0.49 0.00 3.64 0.00 0.00 95.87 05:50:01 AM 18 0.90 0.00 19.63 0.11 0.00 79.36 05:50:01 AM 19 0.76 0.00 6.19 0.03 0.00 93.02 05:50:01 AM 20 1.11 0.00 4.42 0.06 0.00 94.41 05:50:01 AM 21 0.74 0.00 3.29 0.02 0.00 95.95 05:50:01 AM 22 0.37 0.00 1.72 0.01 0.00 97.90 05:50:01 AM 23 0.78 0.00 5.67 0.04 0.00 93.50 05:50:01 AM CPU %user %nice %system %iowait %steal %idle 06:00:01 AM all 1.93 0.00 11.03 0.01 0.00 87.03 06:00:01 AM 0 3.39 0.00 17.41 0.02 0.00 79.18 06:00:01 AM 1 14.49 0.00 35.42 0.00 0.00 50.09 06:00:01 AM 2 5.96 0.00 27.15 0.00 0.00 66.89 06:00:01 AM 3 3.31 0.00 18.51 0.02 0.00 78.16 06:00:01 AM 4 1.45 0.00 11.41 0.00 0.00 87.15 06:00:01 AM 5 0.50 0.00 7.73 0.00 0.00 91.77 06:00:01 AM 6 2.20 0.00 35.46 0.04 0.00 62.30 06:00:01 AM 7 1.59 0.00 15.17 0.01 0.00 83.24 06:00:01 AM 8 0.23 0.00 3.56 0.01 0.00 96.21 06:00:01 AM 9 0.14 0.00 2.01 0.00 0.00 97.85 06:00:01 AM 10 0.13 0.00 1.37 0.00 0.00 98.51 06:00:01 AM 11 0.04 0.00 0.73 0.00 0.00 99.23 06:00:01 AM 12 7.45 0.00 22.89 0.01 0.00 69.66 06:00:01 AM 13 1.45 0.00 13.04 0.00 0.00 85.51 06:00:01 AM 14 0.82 0.00 8.06 0.00 0.00 91.12 06:00:01 AM 15 0.31 0.00 4.05 0.00 0.00 95.63 06:00:01 AM 16 0.29 0.00 2.70 0.00 0.00 97.02 06:00:01 AM 17 0.13 0.00 0.97 0.00 0.00 98.90 06:00:01 AM 18 1.15 0.00 21.66 0.08 0.00 77.10 06:00:01 AM 19 0.43 0.00 7.24 0.00 0.00 92.33 06:00:01 AM 20 0.39 0.00 4.84 0.00 0.00 94.77 06:00:01 AM 21 0.25 0.00 1.94 0.00 0.00 97.81 06:00:01 AM 22 0.15 0.00 0.64 0.00 0.00 99.21 06:00:01 AM 23 0.13 0.00 0.91 0.00 0.00 98.96 06:00:01 AM CPU %user %nice %system %iowait %steal %idle 06:10:01 AM all 2.78 0.00 18.12 0.01 0.00 79.09 06:10:01 AM 0 4.13 0.00 25.91 0.07 0.00 69.89 06:10:01 AM 1 14.89 0.00 41.23 0.01 0.00 43.88 06:10:01 AM 2 8.86 0.00 35.86 0.01 0.00 55.28 06:10:01 AM 3 4.97 0.00 31.55 0.00 0.00 63.48 06:10:01 AM 4 2.86 0.00 25.14 0.00 0.00 72.00 06:10:01 AM 5 2.20 0.00 19.33 0.00 0.00 78.48 06:10:01 AM 6 5.45 0.00 36.19 0.02 0.00 58.34 06:10:01 AM 7 1.96 0.00 26.27 0.04 0.00 71.72 06:10:01 AM 8 1.26 0.00 12.71 0.03 0.00 86.01 06:10:01 AM 9 0.67 0.00 9.15 0.01 0.00 90.18 06:10:01 AM 10 0.55 0.00 5.23 0.00 0.00 94.22 06:10:01 AM 11 0.74 0.00 5.65 0.00 0.00 93.61 06:10:01 AM 12 6.99 0.00 28.78 0.01 0.00 64.23 06:10:01 AM 13 1.61 0.00 19.93 0.00 0.00 78.46 06:10:01 AM 14 1.53 0.00 16.81 0.00 0.00 81.66 06:10:01 AM 15 1.30 0.00 13.27 0.00 0.00 85.43 06:10:01 AM 16 1.07 0.00 10.22 0.00 0.00 88.71 06:10:01 AM 17 0.93 0.00 8.63 0.00 0.00 90.44 06:10:01 AM 18 0.93 0.00 24.76 0.03 0.00 74.28 06:10:01 AM 19 0.90 0.00 13.35 0.01 0.00 85.74 06:10:01 AM 20 0.85 0.00 9.04 0.00 0.00 90.11 06:10:01 AM 21 1.00 0.00 6.38 0.02 0.00 92.60 06:10:01 AM 22 0.54 0.00 6.25 0.00 0.00 93.21 06:10:01 AM 23 0.46 0.00 3.31 0.01 0.00 96.23 

如果您注意到，上午5:20之后系统时间会增加。

• CentOS6框：yum删除Percona-Server-shared-51的依赖关系
• 如何使用bash脚本将variables从一个虚拟机传递给另一个虚拟机
• Centos 6需要密码才能启用网卡
• 在启动时挂载Google Compute持久性磁盘
• 删除生产系统上的内核debugging是否可以，如果它阻止升级？ KVM模板：/ boot没有足够的空间

 Strace output of php process % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 41.96 0.001331 3 438 poll 30.14 0.000956 2 548 munmap % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 52.21 0.001264 6 222 munmap 11.61 0.000281 1 247 poll % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 44.56 0.001159 5 225 munmap 37.99 0.000988 3 320 poll % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 100.00 0.000539 67 8 munmap 0.00 0.000000 0 119 write % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 51.37 0.001034 6 161 munmap 21.56 0.000434 1 293 poll 

如何解决由php7造成的高负载

更新1

1. 当系统上的总RAM很低（<32GB）时，不会发生此问题，但在具有较高RAM（256GB）的系统上出现此问题。
2. 重新启动PHP有时会修复这个问题几天。