DM42 and DM41X: Timing Programs
How Long Does it Take?
There is a convenient way of timing programs on the Swiss Micros DM42 and DM41X. This is accomplished by the TIME function. The TIME function returns the time, initially shown in HH:MM:SS format. HH represents hours, MM represents minutes, and SS represents seconds. The time is stored internally in HH.MMSS format.
We will also use the HMS- function. The HMS- subtracts two time values in HH.MMSS format.
A format that time the performance of an algorithm:
TIME
STO ## (store in any variable desired)
...
[main code here]
…
TIME
RCL ## (recall time stored in the beginning)
HMS-
“TIME=” (shows the time using a message, optional)
ARCL ST X
AVIEW
RTN
The elapsed time is in HH.MMSS format.
One word of caution, I would not use this method if you plan to run the test and midnight (12:00 AM or 0:00 hours) comes in between execution.
Example Code
Here is an example program that measure long a loop takes. In the example, the loop requires to display the x and y values for the function:
y = 2/5 × ln((x + 1)^2 ÷ 5) for x = 0 to 25.
Swiss Micros DM41X Code
01 LBL ^T TIMETST
02 0.025
03 STO 00
04 TIME
05 STO 01
06 LBL 00
07 RCL 00
08 INT
09 ^T X=
10 ARCL X
11 AVIEW
12 PSE
13 XEQ 01
14 ^T Y=
15 ARCL X
16 AVIEW
17 PSE
18 ISG 00
19 GTO 00
20 TIME
21 RCL 01
22 HMS-
23 ^T TIME=
24 ARCL X
25 AVIEW
26 RTN
27 LBL 01
28 1
29 +
30 X↑2
31 5
32 /
33 LN
34 2
35 *
36 5
37 /
38 RTN
Swiss Micros DM42 Code
00 {75-byte Prgm}
01 LBL “TIMETST”
02 0.025
03 STO 00
04 TIME
05 STO 01
06 LBL 00
07 RCL 00
08 IP
09 “X=”
10 ARCL ST X
11 AVIEW
12 PSE
13 XEQ 01
14 “Y=”
15 ARCL ST X
16 AVIEW
17 PSE
18 ISG 00
19 GTO 00
20 TIME
21 RCL 01
22 HMS-
23 “TIME=”
24 ARCL ST X
25 AVIEW
26 RTN
27 LBL 01
28 1
29 +
30 X↑2
31 5
32 ÷
33 LN
34 2
35 ×
36 5
37 ÷
38 RTN
The results that I have:
DM41X (SN 00843): 0.0049 (49 seconds)
DM42 (SN 03911): 0.0053 (53 seconds)
For reference, here are the values (rounded to 4 digits):
X |
Y |
0 |
-0.6438 |
1 |
-0.0893 |
2 |
0.2351 |
3 |
0.4653 |
4 |
0.6438 |
5 |
0.7896 |
6 |
0.9130 |
7 |
1.0198 |
8 |
1.1140 |
9 |
1.1983 |
10 |
1.2745 |
11 |
1.3442 |
12 |
1.4082 |
13 |
1.4675 |
14 |
1.5227 |
15 |
1.5743 |
16 |
1.6228 |
17 |
1.6685 |
18 |
1.7118 |
19 |
1.7528 |
20 |
1.7918 |
21 |
1.8291 |
22 |
1.8646 |
23 |
1.8987 |
24 |
1.9313 |
25 |
1.9627 |
I hope you find this helpful. Take care and until next time,
Eddie
All original content copyright, © 2011-2024. Edward Shore. Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited. This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.
