针对Oracle的Linux HugePages 配置

针对Oracle的Linux HugePages 配置

1.关于配置memlock

关于配置memlock详见MOS：​​​ulimit -l134217728

3.查看当前hugepagesize

[oracle@node02:/home/oracle]$ grep Hugepagesize /proc/meminfoHugepagesize: 2048 kB

4.查看hugepages值，在MOS上有一个脚本可以查看

​​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# Welcome textecho "This script is provided by Doc ID 401749.1 from My Oracle Support(where it is intended to compute values forthe recommended HugePages/HugeTLB configuration for the current sharedmemory 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 the overall 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 -mPress Enter to proceed..."read# Check for the kernel versionKERN=`uname -r | awk -F. '{ printf("%d.%d/n",$1,$2); }'`# Find out the HugePage sizeHPG_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 1fi# Initialize the counterNUM_PG=0# Cumulative number of pages required to handle the running shared memory segmentsfor 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+$MIN_PG+1" | bc -q` fidoneRES_BYTES=`echo "$NUM_PG * $HPG_SZ * 1024" | bc -q`# An SGA less than 100MB does not make sense# Bail out if that is the caseif [ $RES_BYTES -lt 100000000 ]; then echo "***********" echo "** ERROR **" echo "***********" echo "Sorry! There are not enough total of shared memory segments allocated forHugePages configuration. HugePages can only be used for shared memory segmentsthat you can list by command: # ipcs -mof 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 1fi# Finish with resultscase $KERN in '2.4') HUGETLB_POOL=`echo "$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" ;; '4.14') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;; '4.18') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;; '5.4') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;; *) echo "Kernel version $KERN is not supported by this script (yet). Exiting." ;;esac# End

5.执行脚本

执行命令chmod +x hugepages_settings.sh sh hugepages_setting.sh

[root@node01 oracle]# sh hugepages_settings.sh This script is provided by Doc ID 401749.1 from My Oracle Support(where it is intended to compute values forthe recommended HugePages/HugeTLB configuration for the current sharedmemory 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 the overall 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 -mPress Enter to proceed...Recommended setting: vm.nr_hugepages = 1205

修改/etc/sysctl.conf文件 vm.nr_hugepages=1205

6. 重启操作系统生效

7.验证hugepage

[root​​@node01​​​ ~]# grep HugePages_Total /proc/meminfo HugePages_Total: 1205

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