Felix,
I was able to run this test today. I have access to a 56 CPU machine that mostly isn't doing anything. Here is the CPU info:
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 56
On-line CPU(s) list: 0-55
Thread(s) per core: 2
Core(s) per socket: 14
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 79
Model name: Intel(R) Xeon(R) CPU E5-2660 v4 @ 2.00GHz
Stepping: 1
CPU MHz: 1200.703
CPU max MHz: 3200.0000
CPU min MHz: 1200.0000
BogoMIPS: 3999.82
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 35840K
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb cat_l3 cdp_l3 invpcid_single intel_pt spec_ctrl ibpb_support tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm rdt_a rdseed adx smap xsaveopt cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts
Since it has 56 CPUs I extended the test program to use 40 goroutines instead of 10 for a broader sample size.
I built the program with Go 1.14.4:
Here are the results for builtin pprof:
(pprof) top40
Showing nodes accounting for 2.12mins, 99.82% of 2.13mins total
Dropped 10 nodes (cum <= 0.01mins)
flat flat% sum% cum cum%
0.11mins 5.37% 5.37% 0.11mins 5.37% main.f32
0.10mins 4.51% 9.88% 0.10mins 4.51% main.f5
0.09mins 4.23% 14.11% 0.09mins 4.23% main.f37
0.09mins 4.20% 18.31% 0.09mins 4.20% main.f10
0.09mins 4.00% 22.32% 0.09mins 4.00% main.f9
0.08mins 3.88% 26.19% 0.08mins 3.88% main.f26
0.08mins 3.60% 29.79% 0.08mins 3.61% main.f35
0.07mins 3.13% 32.92% 0.07mins 3.13% main.f11
0.07mins 3.10% 36.02% 0.07mins 3.10% main.f40
0.07mins 3.06% 39.09% 0.07mins 3.06% main.f27
0.06mins 3.01% 42.09% 0.06mins 3.01% main.f16
0.06mins 2.98% 45.08% 0.06mins 2.98% main.f17
0.06mins 2.94% 48.01% 0.06mins 2.94% main.f6
0.06mins 2.84% 50.86% 0.06mins 2.84% main.f22
0.06mins 2.80% 53.65% 0.06mins 2.80% main.f20
0.06mins 2.77% 56.43% 0.06mins 2.77% main.f2
0.06mins 2.76% 59.18% 0.06mins 2.76% main.f8
0.06mins 2.71% 61.89% 0.06mins 2.71% main.f28
0.05mins 2.54% 64.43% 0.05mins 2.55% main.f19
0.05mins 2.47% 66.90% 0.05mins 2.48% main.f4
0.05mins 2.24% 69.14% 0.05mins 2.24% main.f7
0.05mins 2.21% 71.35% 0.05mins 2.21% main.f24
0.05mins 2.15% 73.50% 0.05mins 2.15% main.f36
0.04mins 2.11% 75.61% 0.04mins 2.11% main.f38
0.04mins 2.03% 77.64% 0.04mins 2.03% main.f30
0.04mins 1.98% 79.62% 0.04mins 2.00% main.f34
0.04mins 1.97% 81.59% 0.04mins 1.98% main.f12
0.04mins 1.94% 83.54% 0.04mins 1.96% main.f39
0.04mins 1.86% 85.40% 0.04mins 1.86% main.f33
0.04mins 1.83% 87.22% 0.04mins 1.83% main.f31
0.04mins 1.78% 89.00% 0.04mins 1.79% main.f13
0.04mins 1.65% 90.66% 0.04mins 1.67% main.f14
0.03mins 1.60% 92.25% 0.03mins 1.60% main.f18
0.03mins 1.26% 93.51% 0.03mins 1.27% main.f1
0.03mins 1.24% 94.75% 0.03mins 1.25% main.f23
0.02mins 1.13% 95.88% 0.02mins 1.14% main.f3
0.02mins 1.11% 96.99% 0.02mins 1.12% main.f29
0.02mins 1.08% 98.07% 0.02mins 1.08% main.f21
0.02mins 0.89% 98.96% 0.02mins 0.89% main.f25
0.02mins 0.86% 99.82% 0.02mins 0.86% main.f15
Here are the results for fgprof v0.9.0:
(pprof) top50
Showing nodes accounting for 272.74s, 100% of 272.76s total
Dropped 9 nodes (cum <= 1.36s)
flat flat% sum% cum cum%
266.08s 97.55% 97.55% 266.08s 97.55% runtime.asyncPreempt2
6.66s 2.44% 100% 6.66s 2.44% runtime.gopark
0 0% 100% 6.66s 2.44% main.f1
0 0% 100% 6.66s 2.44% main.f10
0 0% 100% 6.66s 2.44% main.f11
0 0% 100% 6.64s 2.43% main.f12
0 0% 100% 6.66s 2.44% main.f13
0 0% 100% 6.66s 2.44% main.f14
0 0% 100% 6.66s 2.44% main.f15
0 0% 100% 6.66s 2.44% main.f16
0 0% 100% 6.66s 2.44% main.f17
0 0% 100% 6.65s 2.44% main.f18
0 0% 100% 6.66s 2.44% main.f19
0 0% 100% 6.65s 2.44% main.f2
0 0% 100% 6.64s 2.43% main.f20
0 0% 100% 6.65s 2.44% main.f21
0 0% 100% 6.66s 2.44% main.f22
0 0% 100% 6.64s 2.43% main.f23
0 0% 100% 6.66s 2.44% main.f24
0 0% 100% 6.66s 2.44% main.f25
0 0% 100% 6.66s 2.44% main.f26
0 0% 100% 6.66s 2.44% main.f27
0 0% 100% 6.65s 2.44% main.f28
0 0% 100% 6.64s 2.43% main.f29
0 0% 100% 6.66s 2.44% main.f3
0 0% 100% 6.66s 2.44% main.f30
0 0% 100% 6.66s 2.44% main.f31
0 0% 100% 6.66s 2.44% main.f32
0 0% 100% 6.66s 2.44% main.f33
0 0% 100% 6.62s 2.43% main.f34
0 0% 100% 6.66s 2.44% main.f35
0 0% 100% 6.66s 2.44% main.f36
0 0% 100% 6.66s 2.44% main.f37
0 0% 100% 6.66s 2.44% main.f38
0 0% 100% 6.66s 2.44% main.f39
0 0% 100% 6.66s 2.44% main.f4
0 0% 100% 6.66s 2.44% main.f40
0 0% 100% 6.66s 2.44% main.f5
0 0% 100% 6.66s 2.44% main.f6
0 0% 100% 6.66s 2.44% main.f7
0 0% 100% 6.66s 2.44% main.f8
0 0% 100% 6.66s 2.44% main.f9
0 0% 100% 6.66s 2.44% main.main
0 0% 100% 6.66s 2.44% main.run
0 0% 100% 266.08s 97.55% runtime.asyncPreempt
0 0% 100% 6.66s 2.44% runtime.goparkunlock
0 0% 100% 6.66s 2.44% runtime.main
0 0% 100% 6.66s 2.44% runtime.semacquire1
0 0% 100% 6.66s 2.44% sync.(*WaitGroup).Wait
0 0% 100% 6.66s 2.44% sync.runtime_Semacquire
Hope that helps,
Chris