The "demo_MCORE_ballsSMC" with Multicore module has no acceleration effect
henry zhang
Radu Serban
I’m not exactly sure how you are measuring multicore performance. I suggest you run the benchmark test provided precisely for this in the Chrono distribution.
Make sure to enable ‘BUILD_BENCHMARKING’ during CMake configuration, rebuild, and run btest_MCORE_settling.
See below what I get running this benchmark test on my 2 machines.
--Radu
Windows 11 (Ryzen 9 5950X 16-core, 32GB RAM):
2026-01-25T17:12:22+01:00
Running E:\Build\chrono\bin\Release\btest_MCORE_settling.exe
Run on (32 X 3394 MHz CPU s)
CPU Caches:
L1 Data 32 KiB (x16)
L1 Instruction 32 KiB (x16)
L2 Unified 512 KiB (x16)
L3 Unified 32768 KiB (x2)
Simulated 48930 particles using 1 threads.
-------------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations UserCounters...
-------------------------------------------------------------------------------------------------
TEST_NAME/Settle/1/iterations:1/repeats:1/real_time 22294 ms 22141 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0286 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.85529k Step_Total=22.2913k Step_Update=18.4354k
Simulated 48930 particles using 2 threads.
TEST_NAME/Settle/2/iterations:1/repeats:1/real_time 13330 ms 13281 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0344 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.62218k Step_Total=13.3277k Step_Update=9.70482k
Simulated 48930 particles using 3 threads.
TEST_NAME/Settle/3/iterations:1/repeats:1/real_time 10563 ms 10500 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0311 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.59963k Step_Total=10.5611k Step_Update=6.96091k
Simulated 48930 particles using 4 threads.
TEST_NAME/Settle/4/iterations:1/repeats:1/real_time 9315 ms 9297 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0322 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.6188k Step_Total=9.3133k Step_Update=5.69388k
Simulated 48930 particles using 5 threads.
TEST_NAME/Settle/5/iterations:1/repeats:1/real_time 8534 ms 8516 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0367 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.60529k Step_Total=8.53153k Step_Update=4.92561k
Simulated 48930 particles using 6 threads.
TEST_NAME/Settle/6/iterations:1/repeats:1/real_time 7988 ms 7953 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0335 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.56171k Step_Total=7.98622k Step_Update=4.42387k
Simulated 48930 particles using 7 threads.
TEST_NAME/Settle/7/iterations:1/repeats:1/real_time 7581 ms 7547 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.03 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.52162k Step_Total=7.57929k Step_Update=4.05705k
Simulated 48930 particles using 8 threads.
TEST_NAME/Settle/8/iterations:1/repeats:1/real_time 7312 ms 7266 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0297 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.5103k Step_Total=7.30995k Step_Update=3.79902k
Simulated 48930 particles using 9 threads.
TEST_NAME/Settle/9/iterations:1/repeats:1/real_time 7013 ms 6984 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0335 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.74403k Step_Total=7.011k Step_Update=3.26647k
Simulated 48930 particles using 10 threads.
TEST_NAME/Settle/10/iterations:1/repeats:1/real_time 6784 ms 6750 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0414 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.93555k Step_Total=6.7829k Step_Update=2.8468k
Simulated 48930 particles using 11 threads.
TEST_NAME/Settle/11/iterations:1/repeats:1/real_time 6489 ms 6484 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0306 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.84956k Step_Total=6.4865k Step_Update=2.63633k
Simulated 48930 particles using 12 threads.
TEST_NAME/Settle/12/iterations:1/repeats:1/real_time 6347 ms 6344 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0255 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.80542k Step_Total=6.34536k Step_Update=2.53932k
Simulated 48930 particles using 13 threads.
TEST_NAME/Settle/13/iterations:1/repeats:1/real_time 6364 ms 6359 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0302 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.95381k Step_Total=6.36169k Step_Update=2.40734k
Simulated 48930 particles using 14 threads.
TEST_NAME/Settle/14/iterations:1/repeats:1/real_time 6339 ms 6312 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0297 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=3.96912k Step_Total=6.33732k Step_Update=2.36758k
Simulated 48930 particles using 15 threads.
TEST_NAME/Settle/15/iterations:1/repeats:1/real_time 7321 ms 7328 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.0282 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=4.26353k Step_Total=7.31823k Step_Update=3.05394k
Simulated 48930 particles using 16 threads.
TEST_NAME/Settle/16/iterations:1/repeats:1/real_time 7463 ms 7438 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.035 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=4.33763k Step_Total=7.46085k Step_Update=3.12245k
Ubuntu 24.04 (Ryzen 9 8945H5 16-core, 32GB RAM)
2026-01-25T17:11:25+01:00
Running ./btest_MCORE_settling
Run on (16 X 2216.31 MHz CPU s)
CPU Caches:
L1 Data 32 KiB (x8)
L1 Instruction 32 KiB (x8)
L2 Unified 1024 KiB (x8)
L3 Unified 16384 KiB (x1)
Load Average: 0.51, 2.75, 4.23
Simulated 49073 particles using 1 threads.
------------------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations UserCounters...
------------------------------------------------------------------------------------------------------
TEST_NAME/Settle/1/iterations:1/repeats:1/real_time 10710 ms 10706 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.085634 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.2904k Step_Total=10.7074k Step_Update=9.41615k
Simulated 49073 particles using 2 threads.
TEST_NAME/Settle/2/iterations:1/repeats:1/real_time 6057 ms 6055 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.07524 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.06143k Step_Total=6.05489k Step_Update=4.99256k
Simulated 49073 particles using 3 threads.
TEST_NAME/Settle/3/iterations:1/repeats:1/real_time 4951 ms 4949 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.055487 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.04459k Step_Total=4.94862k Step_Update=3.90306k
Simulated 49073 particles using 4 threads.
TEST_NAME/Settle/4/iterations:1/repeats:1/real_time 4371 ms 4371 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.06615 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=906.75 Step_Total=4.36818k Step_Update=3.46046k
Simulated 49073 particles using 5 threads.
TEST_NAME/Settle/5/iterations:1/repeats:1/real_time 3995 ms 3994 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.075298 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.01361k Step_Total=3.99224k Step_Update=2.97771k
Simulated 49073 particles using 6 threads.
TEST_NAME/Settle/6/iterations:1/repeats:1/real_time 3684 ms 3684 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.066199 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=901.109 Step_Total=3.68169k Step_Update=2.77968k
Simulated 49073 particles using 7 threads.
TEST_NAME/Settle/7/iterations:1/repeats:1/real_time 3528 ms 3528 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.076243 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.02457k Step_Total=3.52518k Step_Update=2.49969k
Simulated 49073 particles using 8 threads.
TEST_NAME/Settle/8/iterations:1/repeats:1/real_time 3373 ms 3373 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.070844 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.01938k Step_Total=3.37052k Step_Update=2.35017k
Simulated 49073 particles using 9 threads.
TEST_NAME/Settle/9/iterations:1/repeats:1/real_time 3690 ms 3687 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.126123 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=855.927 Step_Total=3.68635k Step_Update=2.82932k
Simulated 49073 particles using 10 threads.
TEST_NAME/Settle/10/iterations:1/repeats:1/real_time 3562 ms 3558 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.121574 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=858.595 Step_Total=3.55823k Step_Update=2.69864k
Simulated 49073 particles using 11 threads.
TEST_NAME/Settle/11/iterations:1/repeats:1/real_time 3599 ms 3596 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.127541 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.03347k Step_Total=3.59571k Step_Update=2.56116k
Simulated 49073 particles using 12 threads.
TEST_NAME/Settle/12/iterations:1/repeats:1/real_time 3632 ms 3630 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.130271 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.0425k Step_Total=3.62872k Step_Update=2.58515k
Simulated 49073 particles using 13 threads.
TEST_NAME/Settle/13/iterations:1/repeats:1/real_time 3474 ms 3474 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.10314 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=929.634 Step_Total=3.47033k Step_Update=2.5396k
Simulated 49073 particles using 14 threads.
TEST_NAME/Settle/14/iterations:1/repeats:1/real_time 3586 ms 3586 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.127894 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.06294k Step_Total=3.58277k Step_Update=2.51871k
Simulated 49073 particles using 15 threads.
TEST_NAME/Settle/15/iterations:1/repeats:1/real_time 3314 ms 3314 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.134358 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=921.601 Step_Total=3.31108k Step_Update=2.38844k
Simulated 49073 particles using 16 threads.
TEST_NAME/Settle/16/iterations:1/repeats:1/real_time 3388 ms 3387 ms 1 CD_Broad=0 CD_Narrow=0 CD_Total=0.120701 LS_Jacobian=0 LS_Setup=0 LS_Solve=0 Step Setup=0 Step_Advance=1.00086k Step_Total=3.38485k Step_Update=2.38288k
From: projec...@googlegroups.com <projec...@googlegroups.com>
On Behalf Of henry zhang
Sent: Thursday, January 15, 2026 11:29 AM
To: ProjectChrono <projec...@googlegroups.com>
Subject: [chrono] The "demo_MCORE_ballsSMC" with Multicore module has no acceleration effect
I increased the number of balls in "demo_MCORE_ballsSMC" project, and as the title said, the multi-core module has no acceleration effect.
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