## Measuring time of operation...

4k3or3et
Posts: 136
Joined: Sat Nov 17, 2018 5:47 pm

### Measuring time of operation...

Hi guys

i have a little code like this:

Code: Select all

``````lower = 0
upper = 1000
print("Prime numbers between",lower,"and",upper,"are:")
for num in range(lower,upper + 1):
if num > 1:
for i in range(2,num):
if (num % i) == 0:
break
else:
print(num)``````
which lists prime numbers from 0 to 1000.

What i would like to achieve here is to have information as last line, after all prime number displayed how much time the entire operation took, with milisecons.

I am complete noob with all sort of programming.

Can anyone help me what should i add to my code?

Thank you.
Last edited by 4k3or3et on Thu Oct 31, 2019 7:26 pm, edited 3 times in total.

B.Goode
Posts: 10941
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

### Re: Measuring time of operation...

Does this have to be done by modifying your script?

Because there is a time command that can be used at a Linux shell prompt that will provide the same information.

See

Code: Select all

``man time``

neilgl
Posts: 2606
Joined: Sun Jan 26, 2014 8:36 pm
Location: Near Aston Martin factory

### Re: Measuring time of operation...

Maybe get the time in milliseconds at the start, get it again at the end, and subtract the two.

Code: Select all

``````import time
starttime = int(round(time.time() * 1000))
...
... stuff you want to time
...
endtime = int(round(time.time() * 1000))
print("elapsed time in milliseconds = ", endtime-starttime)
``````

4k3or3et
Posts: 136
Joined: Sat Nov 17, 2018 5:47 pm

### Re: Measuring time of operation...

neilgl wrote:
Thu Oct 31, 2019 7:50 pm
Maybe get the time in milliseconds at the start, get it again at the end, and subtract the two.

Code: Select all

``````import time
starttime = int(round(time.time() * 1000))
...
... stuff you want to time
...
endtime = int(round(time.time() * 1000))
print("elapsed time in milliseconds = ", endtime-starttime)
``````
Thank you for your reply. That would be it.

I just did not make myself clear. What i would like is to have the time in format how many hours, minutes, seconds and milisecond it takes. Any clues how to modify 'int(round(time.time() * 1000))' to achieve that?

Thanks again neilgl.

pcmanbob
Posts: 10495
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

### Re: Measuring time of operation...

This short bit of code will convert the number of seconds in to hours:minutes:seconds with the full number of decimal places for the seconds.

Code: Select all

``````
difference = 20469.50422811508179

seconds = difference
minutes = seconds // 60
hours = minutes // 60

print ("number of seconds",difference)

delay = "%02d:%02d:%.15g" % (hours, minutes % 60, seconds % 60)

print("converted to hours:minutes:seconds ",delay)
``````
was taken from a python3 program I wrote for another project hence the odd variable names.

produces the results

number of seconds 20469.50422811508
converted to hours: minutes:seconds 05:41:9.50422811508179

hope it helps

Edit ...

may be even better

Code: Select all

``````difference = 20469.50422811508179

seconds = difference
minutes = seconds // 60
hours = minutes // 60

milliseconds = ((seconds - int(seconds)) *1000)

print ("number of seconds",difference)

delay = "%02d:%02d:%02d:%03d" % (hours, minutes % 60, seconds % 60, milliseconds)

print("converted to hours:minutes:seconds:milliseconds ",delay)
``````
now produces

number of seconds 20469.50422811508
converted to hours:minutes:seconds:milliseconds 05:41:09:504
We want information… information… information........................no information no help
The use of crystal balls & mind reading are not supported

4k3or3et
Posts: 136
Joined: Sat Nov 17, 2018 5:47 pm

### Re: Measuring time of operation...

Thanks a lot.

So i managed to get the code like this:

Code: Select all

``````difference = 20469.50422811508179

seconds = difference
minutes = seconds // 60
hours = minutes // 60

milliseconds = ((seconds - int(seconds)) *1000)

print ("number of seconds",difference)

delay = "%02d:%02d:%02d:%03d" % (hours, minutes % 60, seconds % 60, milliseconds)

print("converted to hours:minutes:seconds:milliseconds ",delay)``````
The only problem now is that it always shows the remaining milliseconds as '000'

for example:

Code: Select all

``````elapsed time in milliseconds =  1846
converted to hours:minutes:seconds:milliseconds  00:00:01:000``````
Anyone see where is the bug?

B.Goode
Posts: 10941
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

### Re: Measuring time of operation...

Anyone see where is the bug?
Difficult to say, because the output does not seem to have come from that script.

4k3or3et
Posts: 136
Joined: Sat Nov 17, 2018 5:47 pm

### Re: Measuring time of operation...

B.Goode wrote:
Fri Nov 01, 2019 6:29 pm
Anyone see where is the bug?
Difficult to say, because the output does not seem to have come from that script.
Sorry about the mess.

So i clean up the code a little bit:

Code: Select all

``````import time
start = int(time.time() * 1000)

lower = 0
upper = 10000
print("Prime numbers between",lower,"and",upper,"are:")
for num in range(lower,upper + 1):
if num > 1:
for i in range(2,num):
if (num % i) == 0:
break
else:
print(num)

stop = int(time.time() * 1000)

difference = stop-start
milliseconds = difference
seconds = milliseconds // 1000
minutes = seconds // 60
hours = minutes // 60
milliseconds2 = (milliseconds - int(milliseconds))

time = "%02d:%02d:%02d:%03d" % (hours, minutes % 60, seconds % 60, milliseconds2)
print("milliseconds:", difference)
print("time:", time)

``````
output looks like this:

Code: Select all

``````Prime numbers between 0 and 10000 are:
2
3
5
7
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97
101
103
107
109
113
127
131
137
139
149
151
157
163
167
173
179
181
191
193
197
199
211
223
227
229
233
239
241
251
257
263
269
271
277
281
283
293
307
311
313
317
331
337
347
349
353
359
367
373
379
383
389
397
401
409
419
421
431
433
439
443
449
457
461
463
467
479
487
491
499
503
509
521
523
541
547
557
563
569
571
577
587
593
599
601
607
613
617
619
631
641
643
647
653
659
661
673
677
683
691
701
709
719
727
733
739
743
751
757
761
769
773
787
797
809
811
821
823
827
829
839
853
857
859
863
877
881
883
887
907
911
919
929
937
941
947
953
967
971
977
983
991
997
1009
1013
1019
1021
1031
1033
1039
1049
1051
1061
1063
1069
1087
1091
1093
1097
1103
1109
1117
1123
1129
1151
1153
1163
1171
1181
1187
1193
1201
1213
1217
1223
1229
1231
1237
1249
1259
1277
1279
1283
1289
1291
1297
1301
1303
1307
1319
1321
1327
1361
1367
1373
1381
1399
1409
1423
1427
1429
1433
1439
1447
1451
1453
1459
1471
1481
1483
1487
1489
1493
1499
1511
1523
1531
1543
1549
1553
1559
1567
1571
1579
1583
1597
1601
1607
1609
1613
1619
1621
1627
1637
1657
1663
1667
1669
1693
1697
1699
1709
1721
1723
1733
1741
1747
1753
1759
1777
1783
1787
1789
1801
1811
1823
1831
1847
1861
1867
1871
1873
1877
1879
1889
1901
1907
1913
1931
1933
1949
1951
1973
1979
1987
1993
1997
1999
2003
2011
2017
2027
2029
2039
2053
2063
2069
2081
2083
2087
2089
2099
2111
2113
2129
2131
2137
2141
2143
2153
2161
2179
2203
2207
2213
2221
2237
2239
2243
2251
2267
2269
2273
2281
2287
2293
2297
2309
2311
2333
2339
2341
2347
2351
2357
2371
2377
2381
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2389
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2399
2411
2417
2423
2437
2441
2447
2459
2467
2473
2477
2503
2521
2531
2539
2543
2549
2551
2557
2579
2591
2593
2609
2617
2621
2633
2647
2657
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2671
2677
2683
2687
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2707
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2767
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2879
2887
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2903
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2953
2957
2963
2969
2971
2999
3001
3011
3019
3023
3037
3041
3049
3061
3067
3079
3083
3089
3109
3119
3121
3137
3163
3167
3169
3181
3187
3191
3203
3209
3217
3221
3229
3251
3253
3257
3259
3271
3299
3301
3307
3313
3319
3323
3329
3331
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3347
3359
3361
3371
3373
3389
3391
3407
3413
3433
3449
3457
3461
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3467
3469
3491
3499
3511
3517
3527
3529
3533
3539
3541
3547
3557
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3571
3581
3583
3593
3607
3613
3617
3623
3631
3637
3643
3659
3671
3673
3677
3691
3697
3701
3709
3719
3727
3733
3739
3761
3767
3769
3779
3793
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3803
3821
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3847
3851
3853
3863
3877
3881
3889
3907
3911
3917
3919
3923
3929
3931
3943
3947
3967
3989
4001
4003
4007
4013
4019
4021
4027
4049
4051
4057
4073
4079
4091
4093
4099
4111
4127
4129
4133
4139
4153
4157
4159
4177
4201
4211
4217
4219
4229
4231
4241
4243
4253
4259
4261
4271
4273
4283
4289
4297
4327
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4349
4357
4363
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4391
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4409
4421
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4463
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4493
4507
4513
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4547
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4561
4567
4583
4591
4597
4603
4621
4637
4639
4643
4649
4651
4657
4663
4673
4679
4691
4703
4721
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4729
4733
4751
4759
4783
4787
4789
4793
4799
4801
4813
4817
4831
4861
4871
4877
4889
4903
4909
4919
4931
4933
4937
4943
4951
4957
4967
4969
4973
4987
4993
4999
5003
5009
5011
5021
5023
5039
5051
5059
5077
5081
5087
5099
5101
5107
5113
5119
5147
5153
5167
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5197
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5261
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5413
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5519
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5701
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5779
5783
5791
5801
5807
5813
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5843
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5857
5861
5867
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5879
5881
5897
5903
5923
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5953
5981
5987
6007
6011
6029
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6067
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6079
6089
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6101
6113
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6131
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6143
6151
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6203
6211
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6287
6299
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6359
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6421
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6803
6823
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6857
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6907
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6947
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6967
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6977
6983
6991
6997
7001
7013
7019
7027
7039
7043
7057
7069
7079
7103
7109
7121
7127
7129
7151
7159
7177
7187
7193
7207
7211
7213
7219
7229
7237
7243
7247
7253
7283
7297
7307
7309
7321
7331
7333
7349
7351
7369
7393
7411
7417
7433
7451
7457
7459
7477
7481
7487
7489
7499
7507
7517
7523
7529
7537
7541
7547
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7573
7577
7583
7589
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7603
7607
7621
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7643
7649
7669
7673
7681
7687
7691
7699
7703
7717
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7727
7741
7753
7757
7759
7789
7793
7817
7823
7829
7841
7853
7867
7873
7877
7879
7883
7901
7907
7919
7927
7933
7937
7949
7951
7963
7993
8009
8011
8017
8039
8053
8059
8069
8081
8087
8089
8093
8101
8111
8117
8123
8147
8161
8167
8171
8179
8191
8209
8219
8221
8231
8233
8237
8243
8263
8269
8273
8287
8291
8293
8297
8311
8317
8329
8353
8363
8369
8377
8387
8389
8419
8423
8429
8431
8443
8447
8461
8467
8501
8513
8521
8527
8537
8539
8543
8563
8573
8581
8597
8599
8609
8623
8627
8629
8641
8647
8663
8669
8677
8681
8689
8693
8699
8707
8713
8719
8731
8737
8741
8747
8753
8761
8779
8783
8803
8807
8819
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8831
8837
8839
8849
8861
8863
8867
8887
8893
8923
8929
8933
8941
8951
8963
8969
8971
8999
9001
9007
9011
9013
9029
9041
9043
9049
9059
9067
9091
9103
9109
9127
9133
9137
9151
9157
9161
9173
9181
9187
9199
9203
9209
9221
9227
9239
9241
9257
9277
9281
9283
9293
9311
9319
9323
9337
9341
9343
9349
9371
9377
9391
9397
9403
9413
9419
9421
9431
9433
9437
9439
9461
9463
9467
9473
9479
9491
9497
9511
9521
9533
9539
9547
9551
9587
9601
9613
9619
9623
9629
9631
9643
9649
9661
9677
9679
9689
9697
9719
9721
9733
9739
9743
9749
9767
9769
9781
9787
9791
9803
9811
9817
9829
9833
9839
9851
9857
9859
9871
9883
9887
9901
9907
9923
9929
9931
9941
9949
9967
9973
milliseconds: 1775
time: 00:00:01:000``````
as you can see it took 1775ms to complere the task. However human readable time shows only 1 second and 0 milliseconds, where correct time should be 00:00:01:775.

Hope that helps. Anyone can see the bug now?

B.Goode
Posts: 10941
Joined: Mon Sep 01, 2014 4:03 pm
Location: UK

### Re: Measuring time of operation...

Code: Select all

``milliseconds2 = (milliseconds - int(milliseconds))``
So substituting your values -

milliseconds2 = (1775 - int(1775)) = 0 !

So '0' is what gets printed, just as you asked...

billio
Posts: 71
Joined: Thu Dec 15, 2011 8:25 am
Contact: Website

### Re: Measuring time of operation...

Have you considered this in Python3 :

Code: Select all

``````import time
import math

start = time.perf_counter()
# wait a bit or something happens
end = time.perf_counter()

duration = end - start

fractions_of_a_second, seconds = math.modf(duration)
``````
then convert seconds to hours and minutes as you wish.

4k3or3et
Posts: 136
Joined: Sat Nov 17, 2018 5:47 pm

### Re: Measuring time of operation...

B.Goode wrote:
Fri Nov 01, 2019 8:27 pm

Code: Select all

``milliseconds2 = (milliseconds - int(milliseconds))``
So substituting your values -

milliseconds2 = (1775 - int(1775)) = 0 !

So '0' is what gets printed, just as you asked...
Of course! what a silly mistake.

Thanks guys for help!

Last thing i would like to achieve is to count how many prime number were found at given number range. Anybody knows what to use for that?

pcmanbob
Posts: 10495
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

### Re: Measuring time of operation...

So I have modified your code a bit so that it makes things easier to get the results you wanted.

Code: Select all

``````import time
start = time.time()

count = 0
lower = 0
upper = 10000
print("Prime numbers between",lower,"and",upper,"are:")
for num in range(lower,upper + 1):
if num > 1:
for i in range(2,num):
if (num % i) == 0:
break
else:
print(num)
count = count + 1

stop = time.time()

seconds = stop - start
minutes = seconds // 60
hours = minutes // 60

milliseconds = ((seconds - int(seconds)) *1000)

millisecondsT = seconds * 1000

time = "%02d:%02d:%02d:%03d" % (hours, minutes % 60, seconds % 60, milliseconds)
print("milliseconds:", millisecondsT)
print("time:", time)
print ("Number of prime numbers found ", count)
``````
which produces these results

pi@BusterPi:~ \$ python3 prime.py
Prime numbers between 0 and 10000 are:
2
3
5
7
11
13
17
.
.
.
.
9929
9931
9941
9949
9967
9973
milliseconds: 1834.233045578003
time: 00:00:01:834
Number of prime numbers found 1229

So the total milliseconds taken to run the program was 1834.233 ms, which equates to 1 s 834 ms ignoring the point 233 of a ms

and it found 1229 prime numbers.
We want information… information… information........................no information no help
The use of crystal balls & mind reading are not supported

4k3or3et
Posts: 136
Joined: Sat Nov 17, 2018 5:47 pm

### Re: Measuring time of operation...

pcmanbob wrote:
Sat Nov 02, 2019 12:05 am
So I have modified your code a bit so that it makes things easier to get the results you wanted.

Code: Select all

``````import time
start = time.time()

count = 0
lower = 0
upper = 10000
print("Prime numbers between",lower,"and",upper,"are:")
for num in range(lower,upper + 1):
if num > 1:
for i in range(2,num):
if (num % i) == 0:
break
else:
print(num)
count = count + 1

stop = time.time()

seconds = stop - start
minutes = seconds // 60
hours = minutes // 60

milliseconds = ((seconds - int(seconds)) *1000)

millisecondsT = seconds * 1000

time = "%02d:%02d:%02d:%03d" % (hours, minutes % 60, seconds % 60, milliseconds)
print("milliseconds:", millisecondsT)
print("time:", time)
print ("Number of prime numbers found ", count)
``````
which produces these results

pi@BusterPi:~ \$ python3 prime.py
Prime numbers between 0 and 10000 are:
2
3
5
7
11
13
17
.
.
.
.
9929
9931
9941
9949
9967
9973
milliseconds: 1834.233045578003
time: 00:00:01:834
Number of prime numbers found 1229

So the total milliseconds taken to run the program was 1834.233 ms, which equates to 1 s 834 ms ignoring the point 233 of a ms

and it found 1229 prime numbers.
Oh man! that is perfect!

Thanks a lot all of you for your help!

I really appreciate everyone's time here.