Question

ENV：

1，php 5.5

2，mongodb 2.4.6 with replSet（一个主要和五个次要）

3，pecl-mongo 1.5.4

4，带有readPreference的php数据库配置：

array(
    'database'  => 'mydatabase',
    'server'    =>  'mongodb://mongo1:27017,mongo2:27017,mongo3:27017,mongo4:27017,mongo5:27017,mongo6:27017/?readPreference=secondary',
    'options'   => array('replicaSet' => 'myreplica'),
    'profiling' => FALSE,
),

5，mongostats：

mognodb primary (mongostats):   5000-20000 command      10-50 update 
mongodb secondary (mongostats): 1000-1800  command  1000-4000 query

我发现主节点负载很高然后我发现很多系统调用（克隆）与strace -c -p 如何减少系统调用（克隆）？

# strace -c -p 3004

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 53.80    0.020932           6      3687           clone
 13.80    0.005368           1      7374           getsockopt
 13.15    0.005116           1      7374           setsockopt
  7.90    0.003072           1      3688           select
  6.13    0.002385           1      3687           getrlimit
  5.23    0.002033           1      3687           accept
  0.00    0.000000           0       111           mmap
  0.00    0.000000           0       111           mprotect
  0.00    0.000000           0        14         6 futex
------ ----------- ----------- --------- --------- ----------------
100.00    0.038906                 29733         6 total

如何减少MongoDB主系统调用（克隆）？

0 个答案: