CreateThread overhead

[jj2007]

The old i7 is clocked at 4 gig.

Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
152 µs  for #1/1
182 µs  for #2/2
420 µs  for #3/3
444 µs  for #4/4
464 µs  for #5/5
489 µs  for #6/6
512 µs  for #7/7
551 µs  for #8/8
571 µs  for #9/9
591 µs  for #10/10
620 µs  for #11/11
649 µs  for #12/12
666 µs  for #13/13
684 µs  for #14/14
705 µs  for #15/15
736 µs  for #16/28  <---- first "outlier"

So far the most "stable" result (2nd for quarantined's AMD), in the sense of launching order == finishing order

[hutch--]

Something you will find is that not all cores in a processor run at the same speed. Both with the old 6 core i7 AND the 12 core Xeon, the core speeds and loadings show some cores faster than others. I use to get the same variation with an earlier 4 core 4770k so its probably a variable factor with multi-core processors.

[quarantined]

My initial CreateThread is always above 1000 µs, on Win7-64. I wonder if Win10 has become better, or if it's cpu related

For your info, all the tests I have run here are on Windows 7, 32 bit. Hope this info is useful

[jj2007]

My initial CreateThread is always above 1000 µs, on Win7-64. I wonder if Win10 has become better, or if it's cpu related

For your info, all the tests I have run here are on Windows 7, 32 bit. Hope this info is useful

It is, it is, thanks

In theory, it could be related to Wow64, the thin layer that lets 32-bit executables access the 64-bit kernel stuff. However, some other members have posted very short CreateThread times, so I doubt that is the reason

[HSE]

Code: [Select]

AMD A6-3500 APU with Radeon(tm) HD Graphics
195 µs  for #1/1
233 µs  for #2/2
516 µs  for #3/3
551 µs  for #4/4
785 µs  for #5/7
869 µs  for #6/6
902 µs  for #7/11
1063 µs for #8/12
1286 µs for #9/8
1395 µs for #10/9
1507 µs for #11/10
1622 µs for #12/5
1682 µs for #13/13
1713 µs for #14/23
1838 µs for #15/15
1925 µs for #16/16
1973 µs for #17/27
2027 µs for #18/28
2090 µs for #19/19
2109 µs for #20/29
2195 µs for #21/21
2247 µs for #22/22
2300 µs for #23/30
2316 µs for #24/32
2400 µs for #25/14
2461 µs for #26/24
2513 µs for #27/25
2581 µs for #28/26
2628 µs for #29/37
2685 µs for #30/17
2777 µs for #31/18
2869 µs for #32/20
2934 µs for #33/31
3063 µs for #34/33
3142 µs for #35/34
3160 µs for #36/35
3278 µs for #37/36
3369 µs for #38/38
3426 µs for #39/39
3633 µs for #40/40This machine have 3 cores and allow 6 subprocess.

[TimoVJL]

Windows 10 x64
https://www.amd.com/en/products/apu/amd-ryzen-5-3400g

Code: [Select]

AMD Ryzen 5 3400G with Radeon Vega Graphics   
327 µs for #1/1
386 µs for #2/2
454 µs for #3/3
492 µs for #4/4
591 µs for #5/6
672 µs for #6/7
698 µs for #7/8
743 µs for #8/5
791 µs for #9/9
895 µs for #10/11
995 µs for #11/12
1046 µs for #12/13
1093 µs for #13/10
1121 µs for #14/16
1168 µs for #15/15
1242 µs for #16/14
1295 µs for #17/17
1349 µs for #18/18
1402 µs for #19/19
1505 µs for #20/20
1661 µs for #21/21
1708 µs for #22/22
1757 µs for #23/23
1804 µs for #24/24
1841 µs for #25/25
1912 µs for #26/26
2006 µs for #27/27
2045 µs for #28/28
2105 µs for #29/29
2157 µs for #30/30
2219 µs for #31/31
2254 µs for #32/32
2317 µs for #33/33
2370 µs for #34/34
2467 µs for #35/35
2550 µs for #36/36
2592 µs for #37/37
2637 µs for #38/38
2701 µs for #39/39
2797 µs for #40/40


[mikeburr]

heres mine ... bit surprised how quick it is
Intel(R) Xeon(R) CPU           X5670  @ 2.93GHz
125 µs   for #1/1
159 µs   for #2/2
193 µs   for #3/3
217 µs   for #4/4
255 µs   for #5/5
431 µs   for #6/6
467 µs   for #7/7
487 µs   for #8/8
504 µs   for #9/11
526 µs   for #10/10
550 µs   for #11/9
577 µs   for #12/12
623 µs   for #13/13
717 µs   for #14/14
785 µs   for #15/15
794 µs   for #16/16
826 µs   for #17/17
847 µs   for #18/18
890 µs   for #19/19
938 µs   for #20/20
974 µs   for #21/21
1008 µs   for #22/22
1034 µs   for #23/23
1078 µs   for #24/24
1115 µs   for #25/25
1155 µs   for #26/26
1214 µs   for #27/27
1259 µs   for #28/28
1298 µs   for #29/29
1340 µs   for #30/30
1360 µs   for #31/31
1388 µs   for #32/32
1438 µs   for #33/33
1468 µs   for #34/34
1506 µs   for #35/35
1552 µs   for #36/36
1589 µs   for #37/37
1608 µs   for #38/38
1654 µs   for #39/39
1676 µs   for #40/40

[LiaoMi]

Code: [Select]

Intel(R) Core(TM) i7-4810MQ CPU @ 2.80GHz
47 µs for creating the thread
thread resumed after 385 µs     for #1
thread resumed after 9 µs       for #2
thread resumed after 7 µs       for #3
thread resumed after 7 µs       for #4
thread resumed after 6 µs       for #5
thread resumed after 7 µs       for #6
thread resumed after 6 µs       for #7
thread resumed after 10 µs      for #8
thread resumed after 4 µs       for #9
thread resumed after 3 µs       for #10
thread resumed after 9 µs       for #11
thread resumed after 4 µs       for #12
thread resumed after 6 µs       for #13
thread resumed after 5 µs       for #14
thread resumed after 9 µs       for #15
thread resumed after 8 µs       for #16
thread resumed after 5 µs       for #17
thread resumed after 8 µs       for #18
thread resumed after 8 µs       for #19
thread resumed after 9 µs       for #20
thread resumed after 9 µs       for #21
thread resumed after 11 µs      for #22
thread resumed after 10 µs      for #23
thread resumed after 8 µs       for #24
thread resumed after 10 µs      for #25
thread resumed after 12 µs      for #26
thread resumed after 14 µs      for #27
thread resumed after 12 µs      for #28
thread resumed after 9 µs       for #29
thread resumed after 17 µs      for #30
thread resumed after 9 µs       for #31
--- hit any key ---


Code: [Select]

Intel(R) Core(TM) i7-4810MQ CPU @ 2.80GHz
163 µs  for #1/1
218 µs  for #2/2
439 µs  for #3/3
506 µs  for #4/5
545 µs  for #5/18
584 µs  for #6/19
632 µs  for #7/20
669 µs  for #8/8
708 µs  for #9/9
766 µs  for #10/10
796 µs  for #11/26
861 µs  for #12/12
888 µs  for #13/13
968 µs  for #14/14
1033 µs for #15/33
1137 µs for #16/4
1169 µs for #17/16
1216 µs for #18/17
1275 µs for #19/6
1378 µs for #20/7
1450 µs for #21/21
1518 µs for #22/22
1590 µs for #23/23
1673 µs for #24/24
1736 µs for #25/25
1791 µs for #26/27
1894 µs for #27/28
1957 µs for #28/29
1988 µs for #29/30
2066 µs for #30/31
2147 µs for #31/15
2190 µs for #32/34
2266 µs for #33/35
2296 µs for #34/36
2324 µs for #35/37
2353 µs for #36/38
2407 µs for #37/39
2450 µs for #38/40
2598 µs for #39/11
2730 µs for #40/32



[jj2007]

Code: [Select]

Intel(R) Core(TM) i7-4810MQ CPU @ 2.80GHz
47 µs for creating the thread
thread resumed after 385 µs     for #1
thread resumed after 9 µs       for #2
thread resumed after 7 µs       for #3
thread resumed after 7 µs       for #4
thread resumed after 6 µs       for #5
thread resumed after 7 µs       for #6
thread resumed after 6 µs       for #7

Wow, that's a fast machine

[Gunther]

Jochen,

sorry, I had simply overlooked your request for the test. Here is my result:

Intel(R) Core(TM) i7-7820X CPU @ 3.60GHz
353 µs   for #1/1
452 µs   for #2/10
554 µs   for #3/3
681 µs   for #4/21
782 µs   for #5/7
871 µs   for #6/27
969 µs   for #7/8
1044 µs   for #8/35
1131 µs   for #9/39
1222 µs   for #10/11
1459 µs   for #11/12
1577 µs   for #12/14
1694 µs   for #13/15
1787 µs   for #14/16
1870 µs   for #15/17
1972 µs   for #16/18
2060 µs   for #17/4
2150 µs   for #18/20
2239 µs   for #19/22
2334 µs   for #20/24
2449 µs   for #21/26
2531 µs   for #22/28
2568 µs   for #23/29
2753 µs   for #24/32
2837 µs   for #25/34
2968 µs   for #26/36
3000 µs   for #27/37
3104 µs   for #28/38
3184 µs   for #29/2
3304 µs   for #30/13
3506 µs   for #31/19
3558 µs   for #32/5
3668 µs   for #33/23
3754 µs   for #34/25
3842 µs   for #35/6
3949 µs   for #36/30
4040 µs   for #37/33
4124 µs   for #38/9
4542 µs   for #40/31
4310 µs   for #39/40

Gunther

[jj2007]

Jochen,

sorry, I had simply overlooked your request for the test. Here is my result:
...
Gunther

No problem, I got already many more answers than I expected. The purpose was simply to check if splitting a short task in many threads makes any sense... and it depends, obviously

[TimoVJL]

I wait to see how Zen 3 / Ryzen 7 perform.
Would be nice to know testing Windows OS too.

A one of my test PC AMD Ryzen 5 3400G with Radeon Vega Graphics runs normally 2.7 GHz and is cabable to 3.7 GHz
so results varies a lot.

Code: [Select]

AMD Ryzen 5 3400G with Radeon Vega Graphics   
179 µs for #1/1
221 µs for #2/2
262 µs for #3/5
308 µs for #4/3
342 µs for #5/4
386 µs for #6/6
455 µs for #7/7
505 µs for #8/8
544 µs for #9/11
573 µs for #10/10
622 µs for #11/9
650 µs for #12/15
752 µs for #13/12
781 µs for #14/13
816 µs for #15/14
843 µs for #16/22
906 µs for #17/16
947 µs for #18/17
973 µs for #19/18
1002 µs for #20/19
1025 µs for #21/20
1055 µs for #22/26
1149 µs for #23/23
1202 µs for #24/24
1239 µs for #25/25
1284 µs for #26/28
1347 µs for #27/27
1405 µs for #28/21
1455 µs for #29/29
1492 µs for #30/30
1556 µs for #31/31
1610 µs for #32/32
1670 µs for #33/33
1714 µs for #34/34
1754 µs for #35/35
1786 µs for #36/36
1839 µs for #37/37
1874 µs for #38/38
1959 µs for #39/39
2023 µs for #40/40


[Gunther]

Jochen,

No problem, I got already many more answers than I expected. The purpose was simply to check if splitting a short task in many threads makes any sense... and it depends, obviously

oh yes, it really depends on a lot of factors. And we are talking about fixed coupling (multiple threads or processes on the same machine). In a cluster (loose coupling), things look quite different again.

Gunther