orion需要首先配置hugepage，否则会出现下列错误。
[root@yyxxdb01 ~]# /opt/app/11.2.0/grid_home/bin/orion -run oltp -testname mytest
ORION: ORacle IO Numbers -- Version 11.2.0.4.0
************************ Large Pages Information *******************
Parameter use_large_pages = onlyPer process system memlock (soft) limit = 64 KB
Large Pages unused system wide = 0 (0 KB)
Large Pages configured system wide = 0 (0 KB)
Large Page size = 2048 KB
ERROR:
Failed to allocate shared global region with large pages, unix errno = 12.
Aborting the run of Orion. ORA-27137: unable to allocate Large Pages to create a shared memory segment
ACTION:
Total Orion I/O Buf Area size is 6144 KB. Prior to next instance restart:
1. Increase the number of unused large pages (page size 2048 KB)
to at least 3 (6144 KB) to allocate 100% Orion I/O Buf Area
with large pages.
2. Large pages are automatically locked into physical memory.
Increase the per process memlock (soft) limit to at least 8192 KB to lock
100% Orion I/O Buf Area's large pages into physical memory
*******************************************************************
Increase huge pages as suggested or set -hugenotneeded flag on command line
Failed to create shared memory of size 1051296 (orion_setup_shmem:skgmcreate)
Linux-x86_64 Error: 12: Cannot allocate memory
Additional information: 2097152
orion_parse_args: orion_setup_shmem failed
#!/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.# 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'}`# Start from 1 pages to be on the safe side and guarantee 1 free HugePageNUM_PG=1# Cumulative number of pages required to handle the running shared memorysegmentsfor SEG_BYTES in `ipcs -m | awk {'print $5'} | grep "[0-9][0-9]*"`doMIN_PG=`echo "$SEG_BYTES/($HPG_SZ*1024)" | bc -q`if [ $MIN_PG -gt 0 ]; thenNUM_PG=`echo "$NUM_PG+$MIN_PG+1" | bc -q`fidone# 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' | '3.8' | '4.1') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;*) echo "Unrecognizedkernel version $KERN. Exiting." ;;esac# End
$ chmod u+x hugepages_setting.sh
$ ./hugepages_setting.sh
在"/etc/sysctl.conf"文件里配置huagepages：
vm.nr_hugepages=306
Run the following command as the"root" user.
说明hugepages的配置可以用sysctl –p进行实时生效
# sysctl -p
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