Create hugepages_setting.sh

hugepages_setting.sh

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+#!/bin/bash
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this file. If not, see <http://www.gnu.org/licenses/>.
+##
+#
+# Script installation:
+#echo "cd /etc/bacula/scripts && git clone https://github.com/MykolaPerehinets/auditlinuxsystem.git"
+#
+# Script function:
+# Configuring HugePages for Oracle on Linux (x86-64). Linux bash script to compute values for the
+# recommended HugePages/HugeTLB configuration
+# https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/performance_tuning_guide/s-memory-transhuge
+# https://oracle-base.com/articles/linux/configuring-huge-pages-for-oracle-on-linux-64
+# https://www.cnblogs.com/zhangshengdong/p/11889148.html
+# Please use for this action root account!
+#
+# 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.
+#
+#
+# Script Submitted and Deployment in Production environments by:
+# Mykola Perehinets (mperehin)
+# Tel: +380 67 772 6910
+# Mailto: [email protected]
+#
+#######################################################################################################################
+# Script modified date
+Version=25012022
+#
+#######################################################################################################################
+#
+# 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'}`
+#
+# Start from 1 pages to be on the safe side and guarantee 1 free HugePage
+NUM_PG=1
+#
+# Cumulative number of pages required to handle the running shared memory segments
+for SEG_BYTES in `ipcs -m | awk {'print $5'} | grep "[0-9][0-9]*"`
+do
+   MIN_PG=`echo "$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
+#
+# Finish with results
+case $KERN in
+   '2.4') HUGETLB_POOL=`echo "$NUM_PG*$HPG_SZ/1024" | bc -q`;
+          echo "Recommended setting: vm.hugetlb_pool = $HUGETLB_POOL" ;;
+   '2.6' | '3.8' | '3.10' | '4.1' | '4.14' ) echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
+    *) echo "Unrecognized kernel version $KERN. Exiting." ;;
+esac
+#
+# End
+