A test of the kernel scheduler. This uses varying amounts of threads and processes as shown in the progression below.
Topdown profile is dominated by frontend stalls with not many backend stalls. Retirement rate is consistent through different numbers of threads/processes.
AMD metrics show little floating point or L2 access.
elapsed 3103.839
on_cpu 0.881 # 14.10 / 16 cores
utime 2834.004
stime 40925.639
nvcsw 685247592 # 76.91%
nivcsw 205745161 # 23.09%
inblock 0 # 0.00/sec
onblock 15128 # 4.87/sec
cpu-clock 43755689957976 # 43755.690 seconds
task-clock 43759705281147 # 43759.705 seconds
page faults 689472 # 15.756/sec
context switches 890984992 # 20360.854/sec
cpu migrations 82144359 # 1877.169/sec
major page faults 46 # 0.001/sec
minor page faults 689426 # 15.755/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 23501436824532 # 203.654 branches per 1000 inst
branch misses 3032522200893 # 12.90% branch miss
conditional 10698516228519 # 92.709 conditional branches per 1000 inst
indirect 239505493842 # 2.075 indirect branches per 1000 inst
cpu-cycles 91347428654789 # 3.38 GHz
instructions 60895739342932 # 0.67 IPC low
slots 181699842904956 #
retiring 24675428706414 # 13.6% (15.3%)
-- ucode 217739037199 # 0.1%
-- fastpath 24457689669215 # 13.5%
frontend 105015576147955 # 57.8% (65.2%) high
-- latency 88990652940450 # 49.0%
-- bandwidth 16024923207505 # 8.8%
backend 30804556660061 # 17.0% (19.1%)
-- cpu 7074311060381 # 3.9%
-- memory 23730245599680 # 13.1%
speculation 515827690784 # 0.3% ( 0.3%) low
-- branch mispredict 515481404909 # 0.3%
-- pipeline restart 346285875 # 0.0%
smt-contention 20687259190202 # 11.4% ( 0.0%)
cpu-cycles 90504608662935 # 3.21 GHz
instructions 61341111308824 # 0.68 IPC low
instructions 20314482395291 # 35.427 l2 access per 1000 inst
l2 hit from l1 575062511723 # 16.81% l2 miss
l2 miss from l1 70863633140 #
l2 hit from l2 pf 94475719768 #
l3 hit from l2 pf 35652924877 #
l3 miss from l2 pf 14483398129 #
instructions 20307336146846 # 21.070 float per 1000 inst
float 512 103 # 0.000 AVX-512 per 1000 inst
float 256 498 # 0.000 AVX-256 per 1000 inst
float 128 427884882765 # 21.070 AVX-128 per 1000 inst
float MMX 0 # 0.000 MMX per 1000 inst
float scalar 0 # 0.000 scalar per 1000 inst
Intel metrics
elapsed 1286.246
on_cpu 0.786 # 12.58 / 16 cores
utime 1244.302
stime 14940.373
nvcsw 276770340 # 81.39%
nivcsw 63265868 # 18.61%
inblock 600 # 0.47/sec
onblock 3176 # 2.47/sec
cpu-clock 16176082544622 # 16176.083 seconds
task-clock 16179007940539 # 16179.008 seconds
page faults 431645 # 26.679/sec
context switches 340031467 # 21016.830/sec
cpu migrations 41546880 # 2567.950/sec
major page faults 48 # 0.003/sec
minor page faults 431597 # 26.676/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 9419060412929 # 164.638 branches per 1000 inst
branch misses 44100542658 # 0.47% branch miss
conditional 9419061039425 # 164.638 conditional branches per 1000 inst
indirect 2849081581423 # 49.800 indirect branches per 1000 inst
slots 93413724946706 #
retiring 39970625421293 # 42.8% (42.8%)
-- ucode 7326098617840 # 7.8%
-- fastpath 32644526803453 # 34.9%
frontend 40717041467788 # 43.6% (43.6%)
-- latency 18873031629963 # 20.2%
-- bandwidth 21844009837825 # 23.4%
backend 9785979087670 # 10.5% (10.5%) low
-- cpu 3709347493414 # 4.0%
-- memory 6076631594256 # 6.5%
speculation 2982448418427 # 3.2% ( 3.2%)
-- branch mispredict 2689553597192 # 2.9%
-- pipeline restart 292894821235 # 0.3%
smt-contention 0 # 0.0% ( 0.0%)
cpu-cycles 48091671451085 # 2.48 GHz
instructions 53251990904221 # 1.11 IPC
l2 access 909727906941 # 33.186 l2 access per 1000 inst
l2 miss 327415399029 # 35.99% l2 miss
Process overview gives 1291 as maximum number of active processes.
28052 processes
27628 hackbench_bin 163474.49 2273324.74
68 clinfo 17.20 5.65
38 vulkaninfo 0.76 1.52
6 php 0.18 0.41
6 glxinfo:gdrv0 0.09 0.10
6 glxinfo:gl0 0.09 0.10
6 clang 0.09 0.03
4 vulkani:disk$0 0.08 0.16
2 glxinfo 0.05 0.04
2 glxinfo:cs0 0.05 0.04
2 glxinfo:disk$0 0.05 0.04
2 glxinfo:sh0 0.05 0.04
2 glxinfo:shlo0 0.05 0.04
2 llvmpipe-0 0.04 0.08
2 llvmpipe-1 0.04 0.08
2 llvmpipe-10 0.04 0.08
2 llvmpipe-11 0.04 0.08
2 llvmpipe-12 0.04 0.08
2 llvmpipe-13 0.04 0.08
2 llvmpipe-14 0.04 0.08
2 llvmpipe-15 0.04 0.08
2 llvmpipe-2 0.04 0.08
2 llvmpipe-3 0.04 0.08
2 llvmpipe-4 0.04 0.08
2 llvmpipe-5 0.04 0.08
2 llvmpipe-6 0.04 0.08
2 llvmpipe-7 0.04 0.08
2 llvmpipe-8 0.04 0.08
2 llvmpipe-9 0.04 0.08
3 rocminfo 0.03 0.00
1 lspci 0.00 0.03
1 ps 0.00 0.01
102 sh 0.00 0.00
56 hackbench 0.00 0.00
13 gcc 0.00 0.00
8 gsettings 0.00 0.00
8 stat 0.00 0.00
8 systemd-detect- 0.00 0.00
6 llvm-link 0.00 0.00
5 gmain 0.00 0.00
5 phoronix-test-s 0.00 0.00
3 dconf worker 0.00 0.00
2 cc 0.00 0.00
2 lscpu 0.00 0.00
2 uname 0.00 0.00
2 which 0.00 0.00
2 xset 0.00 0.00
1 date 0.00 0.00
1 dirname 0.00 0.00
1 dmesg 0.00 0.00
1 dmidecode 0.00 0.00
1 grep 0.00 0.00
1 ifconfig 0.00 0.00
1 ip 0.00 0.00
1 lsmod 0.00 0.00
1 mktemp 0.00 0.00
1 qdbus 0.00 0.00
1 readlink 0.00 0.00
1 realpath 0.00 0.00
1 sed 0.00 0.00
1 sort 0.00 0.00
1 stty 0.00 0.00
1 systemctl 0.00 0.00
1 template.sh 0.00 0.00
1 wc 0.00 0.00
1 xrandr 0.00 0.00
0 processes running
1291 maximum processes
Computation structure is straightforward
2544825) hackbench cpu=7 start=6.59 finish=10.49
2544826) hackbench_bin cpu=8 start=6.60 finish=10.49
2544827) hackbench_bin cpu=3 start=6.60 finish=10.49
2544828) hackbench_bin cpu=6 start=6.60 finish=10.49
2544829) hackbench_bin cpu=0 start=6.60 finish=10.49
2544830) hackbench_bin cpu=12 start=6.60 finish=10.49
2544831) hackbench_bin cpu=13 start=6.60 finish=10.49
2544832) hackbench_bin cpu=4 start=6.60 finish=10.49
2544833) hackbench_bin cpu=9 start=6.60 finish=10.49
2544834) hackbench_bin cpu=5 start=6.60 finish=10.49
2544835) hackbench_bin cpu=8 start=6.60 finish=10.49
2544836) hackbench_bin cpu=14 start=6.60 finish=10.49
2544837) hackbench_bin cpu=15 start=6.60 finish=10.49
2544838) hackbench_bin cpu=12 start=6.60 finish=10.49
2544839) hackbench_bin cpu=0 start=6.60 finish=10.49
2544840) hackbench_bin cpu=4 start=6.60 finish=10.49
2544841) hackbench_bin cpu=6 start=6.60 finish=10.49
2544842) hackbench_bin cpu=1 start=6.60 finish=10.49
2544843) hackbench_bin cpu=11 start=6.60 finish=10.49
2544844) hackbench_bin cpu=5 start=6.60 finish=10.49
2544845) hackbench_bin cpu=12 start=6.60 finish=10.49
2544846) hackbench_bin cpu=8 start=6.60 finish=10.49
2544847) hackbench_bin cpu=7 start=6.60 finish=10.49
2544848) hackbench_bin cpu=13 start=6.60 finish=10.46
2544849) hackbench_bin cpu=2 start=6.60 finish=10.45
2544850) hackbench_bin cpu=5 start=6.60 finish=10.48
2544851) hackbench_bin cpu=2 start=6.60 finish=10.45
2544852) hackbench_bin cpu=10 start=6.60 finish=10.48
2544853) hackbench_bin cpu=8 start=6.60 finish=10.41
2544854) hackbench_bin cpu=14 start=6.60 finish=10.44
2544855) hackbench_bin cpu=11 start=6.60 finish=10.46
2544856) hackbench_bin cpu=8 start=6.60 finish=10.46
2544857) hackbench_bin cpu=7 start=6.60 finish=10.42
2544858) hackbench_bin cpu=11 start=6.60 finish=10.48
2544859) hackbench_bin cpu=0 start=6.60 finish=10.40
2544860) hackbench_bin cpu=8 start=6.60 finish=10.43
2544861) hackbench_bin cpu=14 start=6.60 finish=10.45
2544862) hackbench_bin cpu=0 start=6.60 finish=10.44
2544863) hackbench_bin cpu=12 start=6.60 finish=10.48
2544864) hackbench_bin cpu=7 start=6.60 finish=10.47
2544865) hackbench_bin cpu=9 start=6.60 finish=10.49
2544866) hackbench_bin cpu=1 start=6.60 finish=10.45