关于hugepage

#!/bin/bash## hugepages_settings.sh## Linux bash script to compute values for the# recommended HugePages/HugeTLB configuration## 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 textecho "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. 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 -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 for HugePages configuration. HugePages can only be used for shared memory segments that 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    '2.2') 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" ;;esac# End