linux配置大页内存

设置memlock的限制，更改/etc/security/limits.conf加入下面的行* soft memlock 1048576000* hard memlock 1048576000注意上面的数字是以K为单位的，可以让它的值稍微比系统的物理内存小就可以了检查memlock是否生效，要使用oracle的用户执行下面的操作，如果没有生效尝试重新登陆系统 $ ulimi

脑子进水养啥鱼？

4299人浏览 · 2016-11-10 20:21:58

脑子进水养啥鱼？ · 2016-11-10 20:21:58 发布

 
 设置memlock的限制，更改/etc/security/limits.conf加入下面的行
 * soft memlock 1048576000
 * hard memlock 1048576000
 注意上面的数字是以K为单位的，可以让它的值稍微比系统的物理内存小就可以了
 
 检查memlock是否生效，要使用oracle的用户执行下面的操作，如果没有生效尝试重新登陆系统 
 $ ulimit -l
 1048576000 
 
 如果使用11g数据库，确认参数MEMORY_TARGET和MEMORY_MAX_TARGET已经设为0
 
 $ touch hugepages_settings.sh   向里面写入脚本内容
 $ chmod +x hugepages_settings.sh
 
 启动数据库，并运行上述脚本来计算应该分配多少HugePage页面。例如：
 $ ./hugepages_settings.sh
 ...
 Recommended setting:vm.nr_hugepages = 155141
 
 更改/etc/sysctl.conf，把上一步得到的值指定给vm.nr_hugepages参数
 ...
 vm.nr_hugepages = 155141 （这个数设置过大可能导致操作系统重启起不来）
 ...
 
 重启数据库和OS
 
 验证HugePage是否已启用
 # grep Huge /proc/meminfo
 
  

 
 hugepages_settings.sh脚本内容如下：
  

 
 ******************************************************************************************************** 

 
 #!/bin/bash
 #
 # hugepages_settings.sh
 #
 # Linux bash script to compute values for the
 # recommended HugePages/HugeTLB configuration
 # on Oracle Linux
 #
 # Note: This script does calculation for all shared memory
 # segments available when the script is run, no matter it
 # is an Oracle RDBMS shared memory segment or not.
 #
 # This script is provided by Doc ID 401749.1 from My Oracle Support 
 # http://support.oracle.com
 
 
 # Welcome text
 echo "
 This script is provided by Doc ID 401749.1 from My Oracle Support 
 (http://support.oracle.com) where it is intended to compute values for 
 the recommended HugePages/HugeTLB configuration for the current shared 
 memory segments on Oracle Linux. Before proceeding with the execution please note following:
  * For ASM instance, it needs to configure ASMM instead of AMM.
  * The 'pga_aggregate_target' is outside the SGA and 
    you should accommodate this while calculating SGA size.
  * In case you changes the DB SGA size, 
    as the new SGA will not fit in the previous HugePages configuration, 
    it had better disable the whole HugePages, 
    start the DB with new SGA size and run the script again.
 And make sure that:
  * Oracle Database instance(s) are up and running
  * Oracle Database 11g Automatic Memory Management (AMM) is not setup 
    (See Doc ID 749851.1)
  * The shared memory segments can be listed by command:
      # ipcs -m
 
 
 
 
 Press Enter to proceed..."
 
 
 read
 
 
 # Check for the kernel version
 KERN=`uname -r | awk -F. '{ printf("%d.%d\n",$1,$2); }'`
 
 
 # Find out the HugePage size
 HPG_SZ=`grep Hugepagesize /proc/meminfo | awk '{print $2}'`
 if [ -z "$HPG_SZ" ];then
     echo "The hugepages may not be supported in the system where the script is being executed."
     exit 1
 fi
 
 
 # Initialize the counter
 NUM_PG=0
 
 
 # Cumulative number of pages required to handle the running shared memory segments
 for SEG_BYTES in `ipcs -m | cut -c44-300 | awk '{print $1}' | grep "[0-9][0-9]*"`
 do
     MIN_PG=`echo "$SEG_BYTES/($HPG_SZ*1024)" | bc -q`
     if [ $MIN_PG -gt 0 ]; then
         NUM_PG=`echo "$NUM_PG+$MIN_PG+1" | bc -q`
     fi
 done
 
 
 RES_BYTES=`echo "$NUM_PG * $HPG_SZ * 1024" | bc -q`
 
 
 # An SGA less than 100MB does not make sense
 # Bail out if that is the case
 if [ $RES_BYTES -lt 100000000 ]; then
     echo "***********"
     echo "** ERROR **"
     echo "***********"
     echo "Sorry! There are not enough total of shared memory segments allocated for 
 HugePages configuration. HugePages can only be used for shared memory segments 
 that you can list by command:
 
 
     # ipcs -m
 
 
 of a size that can match an Oracle Database SGA. Please make sure that:
  * Oracle Database instance is up and running 
  * Oracle Database 11g Automatic Memory Management (AMM) is not configured"
     exit 1
 fi
 
 
 # Finish with results
 case $KERN in
     '2.2') echo "Kernel version $KERN is not supported. Exiting." ;;
     '2.4') HUGETLB_POOL=`echo "$NUM_PG*$HPG_SZ/1024" | bc -q`;
            echo "Recommended setting: vm.hugetlb_pool = $HUGETLB_POOL" ;;
     '2.6') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
     '3.8') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
     '3.10') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
     '4.1') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
 esac
 
 
 # End
  

 
 **************************************************************************************************** 

 
 参考文档 

 
 HugePages on Oracle Linux 64-bit ( 
 文档 
  ID 361468.1) 

 
 Shell Script to Calculate Values Recommended Linux HugePages / HugeTLB Configuration ( 
 文档 
  ID 401749.1) 

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