Enabling Subprogram Inlining

Question

Hi,
In an attempt to test Subprogram Inlining in Oracle 11g (11.2.0.1.0 64-bit on Linux), I executed the code below:
SQL> show parameter PLSQL_OPTIMIZE_LEVEL
NAME                                 TYPE        VALUE
plsql_optimize_level                 integer     2
SET SERVEROUTPUT ON
DECLARE
v_num PLS_INTEGER := 1;
v_result PLS_INTEGER;
-- Following are used for elapsed time calculation
v_start_time NUMBER;
v_end_time NUMBER;
-- Define simple function to test PRAGMA INLINE
FUNCTION test_inline_pragma
  (in_num1 IN PLS_INTEGER, in_num2 IN PLS_INTEGER)
RETURN PLS_INTEGER
IS
BEGIN
  RETURN (in_num1 + in_num2);
END test_inline_pragma;
BEGIN
-- Test function with INLINE PRAGMA enabled
v_start_time := DBMS_UTILITY.GET_TIME;
FOR i in 1..10000000 LOOP
  PRAGMA INLINE (test_inline_pragma, 'YES');
  v_result := test_inline_pragma (1, i);
END LOOP;
v_end_time := DBMS_UTILITY.GET_TIME;
DBMS_OUTPUT.PUT_LINE ('Elapsed time when PRAGMA INLINE enabled: '||
(v_end_time-v_start_time));
-- Test function with PRAGMA INLINE disabled
v_start_time := DBMS_UTILITY.GET_TIME;
FOR i in 1..10000000 LOOP
  PRAGMA INLINE (test_inline_pragma, 'NO');
  v_result := test_inline_pragma (1, i);
END LOOP;
v_end_time := DBMS_UTILITY.GET_TIME;
DBMS_OUTPUT.PUT_LINE ('Elapsed time when INLINE PRAGMA disabled: '||
(v_end_time-v_start_time));
END;
-- output of the code above:
Elapsed time when PRAGMA INLINE enabled: 46
Elapsed time when INLINE PRAGMA disabled: 147
PL/SQL procedure successfully completed.Obviously enabling Subprogram Inlining provided enhacement in executing the subprogram in loop, despite the simplicity of the called function.
Now my question is: Does the example show that I have to enable Subprogram Inlining before calling any subprogram all the way in any PL/SQL code?
Note: The example taken from the book: Oracle PL/SQL by Example 4th Ed by BENJAMIN ROSENZWEIG and ELENA RAKHIMOV

Answer 1

A simple way to do that would be to use a systemd timer unit, named '/etc/systemd/system/tvheadend.timer':
[Unit]
Description=Delaying tvheadend start
[Timer]
OnStartupSec=20
AccuracySec=5
Then:
# cp /usr/lib/systemd/system/tvheadend.service /etc/systemd/system
# cd /etc/systemd/system
# vim tvheadend.service
# diff /usr/lib/systemd/system/tvheadend.service tvheadend.service
14c14
< WantedBy=multi-user.target
> #WantedBy=multi-user.target
Edit: The above part is superfluous, sorry, see the next posts
Finally:
# systemctl disable tvheadend.service
# systemctl add-wants multi-user.target tvheadend.timer
# systemctl daemon-reload
This timer will start the 'tvheadend.service' 20 seconds (+~5 seconds) after systemd start time.
To my opinion, this is the easiest way to do that (no udev rule to write with the systemd device unit features which is much more complicated).
Last edited by berbae (2015-04-28 15:13:47)