Shell Script to Calculate Values Recommended Linux HugePages and HugeTLB Configuration (文档 ID 401749.1).docx

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APPLIES TO:

Linux OS - Version Oracle Linux 4.4 to Oracle Linux 6.6 [Release

OL4U4 to OL6U6]

Oracle Database - Enterprise Edition

Generic Linux

PURPOSE

This script is intended to compute values for the recommended

HugePages/HugeTLB con*guration for the current shared memory

segments.

It 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.

For general information about HugePages / HugeTLB, please

see

Note 361323.1

REQUIREMENTS



Oracle Database instance(s) are up and running



Oracle Database 11g Automatic Memory Management (AMM)

is not setup (See

Note 749851.1

)



The shared memory segments can be listed by command

"ipcs -m"

CONFIGURING

1. Create a text *le named hugepages_settings.sh

2. Copy the contents below in the *le

3. Run:

$ chmod +x hugepages_settings.sh

INSTRUCTIONS

1. Be sure that all applications that are meant to use

HugePage / HugeTLB are running at the time the script is to

be run. This includes the Oracle RDBMS instances and ASM

instances in addition to other applications.

2. Be sure that you have /bin and /usr/bin in $PATH

3. Run:

$ ./hugepages_settings.sh

CAUTION

This sample code is provided for educational purposes only, and is

not supported by Oracle Support. It has been tested internally,

however, we do not guarantee that it will work for you. Ensure that

you run it in your test environment before using.

SCRIPT

#!/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 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. Before proceeding with the execution

please note following:

* For ASM instance, it needs to configure ASMM instead

of AMM.

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