这是AWS
Linux AMI EBS上的标准apache Web服务器.我们注意到高负载平均值(8)和iotop -a显示:
Total disK READ: 0.00 B/s | Total disK WRITE: 2.37 M/s TID PRIO USER disK READ disK WRITE SWAPIN IO> COMMAND 3730 be/4 root 0.00 B 0.00 B 0.00 % 91.98 % [kworker/u8:1] 774 be/3 root 0.00 B 1636.00 K 0.00 % 15.77 % [jbd2/xvda1-8] 3215 be/4 apache 0.00 B 40.39 M 0.00 % 0.88 % httpd 3270 be/4 apache 0.00 B 38.20 M 0.00 % 0.93 % httpd 2770 be/4 apache 0.00 B 46.86 M 0.00 % 0.71 % httpd
服务器没有交换,因为我们有足够的RAM可用.我已经看到这个问题与数据库服务器有关,但不仅仅是与Apache隔离.
有关如何进一步诊断和预防它的任何想法?
Samples: 114K of event 'cpu-clock',Event count (approx.): 28728500000 - 83.58% swapper [kernel.kallsyms] [k] xen_hypercall_sched_op ◆ + xen_hypercall_sched_op ▒ + default_idle ▒ + arch_cpu_idle ▒ - cpu_startup_entry ▒ 70.16% cpu_bringup_and_idle ▒ - 29.84% rest_init ▒ start_kernel ▒ x86_64_start_reservations ▒ xen_start_kernel ▒ + 1.73% httpd [kernel.kallsyms] [k] __d_lookup_rcu ▒ + 1.08% httpd [kernel.kallsyms] [k] xen_hypercall_xen_version ▒ + 0.38% httpd [vdso] [.] 0x0000000000000d7c ▒ + 0.36% httpd libPHP5.so [.] zend_hash_find ▒ + 0.33% httpd libPHP5.so [.] _zend_hash_add_or_update ▒ + 0.25% httpd libc-2.17.so [.] __memcpy_ssse3 ▒ + 0.24% httpd libPHP5.so [.] _zval_ptr_dtor ▒ + 0.24% httpd [kernel.kallsyms] [k] __audit_syscall_entry ▒ + 0.22% httpd [kernel.kallsyms] [k] pvclock_clocksource_read ▒