Dav1d is an AV1 video decoder. The test profile decodes four test cases. Looks like the second is the most parallel and the others are more varied.
Topdown profile shows variation among the four workloads with backend stalls being the highest.
AMD metrics show moderate amount of floating point and L2 access. Backend memory stalls are almost a third.
elapsed 213.115
on_cpu 0.549 # 8.78 / 16 cores
utime 1805.063
stime 66.539
nvcsw 7292893 # 99.54%
nivcsw 33533 # 0.46%
inblock 8 # 0.04/sec
onblock 32120 # 150.72/sec
cpu-clock 1868875848465 # 1868.876 seconds
task-clock 1871235081315 # 1871.235 seconds
page faults 1296792 # 693.014/sec
context switches 7327292 # 3915.752/sec
cpu migrations 259220 # 138.529/sec
major page faults 114 # 0.061/sec
minor page faults 1296678 # 692.953/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 797429608804 # 91.153 branches per 1000 inst
branch misses 31051314265 # 3.89% branch miss
conditional 554521597992 # 63.387 conditional branches per 1000 inst
indirect 31801373582 # 3.635 indirect branches per 1000 inst
cpu-cycles 7341843796700 # 2.16 GHz
instructions 8777978628368 # 1.20 IPC
slots 14651540873352 #
retiring 3052095062857 # 20.8% (24.6%)
-- ucode 9469121995 # 0.1%
-- fastpath 3042625940862 # 20.8%
frontend 2509044102042 # 17.1% (20.2%)
-- latency 1787348551950 # 12.2%
-- bandwidth 721695550092 # 4.9%
backend 6416392439737 # 43.8% (51.8%)
-- cpu 1756022735988 # 12.0%
-- memory 4660369703749 # 31.8%
speculation 412129118255 # 2.8% ( 3.3%)
-- branch mispredict 400255856656 # 2.7%
-- pipeline restart 11873261599 # 0.1%
smt-contention 2260744776351 # 15.4% ( 0.0%)
cpu-cycles 7322460098899 # 2.16 GHz
instructions 8771050990318 # 1.20 IPC
instructions 2918023070070 # 42.342 l2 access per 1000 inst
l2 hit from l1 98802700440 # 20.41% l2 miss
l2 miss from l1 16287763107 #
l2 hit from l2 pf 15816267300 #
l3 hit from l2 pf 5099496907 #
l3 miss from l2 pf 3835063557 #
instructions 2907823574044 # 78.422 float per 1000 inst
float 512 71 # 0.000 AVX-512 per 1000 inst
float 256 780909299 # 0.269 AVX-256 per 1000 inst
float 128 227256236913 # 78.153 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 310.147
on_cpu 0.595 # 9.52 / 16 cores
utime 2887.159
stime 64.256
nvcsw 7951545 # 98.51%
nivcsw 120051 # 1.49%
inblock 1128 # 3.64/sec
onblock 21720 # 70.03/sec
cpu-clock 2944930192235 # 2944.930 seconds
task-clock 2947005189952 # 2947.005 seconds
page faults 1327781 # 450.553/sec
context switches 8072952 # 2739.375/sec
cpu migrations 462799 # 157.040/sec
major page faults 51 # 0.017/sec
minor page faults 1327730 # 450.535/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 953131786197 # 82.134 branches per 1000 inst
branch misses 36337085889 # 3.81% branch miss
conditional 953131806421 # 82.134 conditional branches per 1000 inst
indirect 291031404595 # 25.079 indirect branches per 1000 inst
slots 14767434767564 #
retiring 6255263054310 # 42.4% (42.4%)
-- ucode 555928141851 # 3.8%
-- fastpath 5699334912459 # 38.6%
frontend 3164173402768 # 21.4% (21.4%)
-- latency 1771171686807 # 12.0%
-- bandwidth 1393001715961 # 9.4%
backend 3663495894120 # 24.8% (24.8%)
-- cpu 1313061620123 # 8.9%
-- memory 2350434273997 # 15.9%
speculation 1538479772866 # 10.4% (10.4%) high
-- branch mispredict 1426065334132 # 9.7%
-- pipeline restart 112414438734 # 0.8%
smt-contention 0 # 0.0% ( 0.0%)
cpu-cycles 10440337596098 # 1.94 GHz
instructions 14928314665212 # 1.43 IPC
l2 access 244374955407 # 35.293 l2 access per 1000 inst
l2 miss 70966808581 # 29.04% l2 miss
Process overview shows dav1d and dav1d-worker as taking the most time.
570 processes
192 dav1d-worker 28840.16 673.60
24 dav1d 1802.51 42.24
68 clinfo 17.19 5.66
38 vulkaninfo 0.95 1.15
6 php 0.62 0.13
4 vulkani:disk$0 0.11 0.13
6 glxinfo:gdrv0 0.11 0.06
6 glxinfo:gl0 0.11 0.06
2 llvmpipe-0 0.06 0.07
2 llvmpipe-1 0.06 0.07
2 llvmpipe-10 0.06 0.07
2 llvmpipe-11 0.06 0.07
2 llvmpipe-12 0.06 0.07
2 llvmpipe-13 0.06 0.07
2 llvmpipe-14 0.06 0.07
2 llvmpipe-15 0.06 0.07
2 llvmpipe-2 0.06 0.07
2 llvmpipe-3 0.06 0.07
2 llvmpipe-4 0.06 0.07
2 llvmpipe-5 0.06 0.07
2 llvmpipe-6 0.06 0.07
2 llvmpipe-7 0.06 0.07
2 llvmpipe-8 0.06 0.07
2 llvmpipe-9 0.06 0.07
2 glxinfo 0.06 0.03
2 glxinfo:cs0 0.06 0.03
2 glxinfo:disk$0 0.06 0.03
2 glxinfo:sh0 0.06 0.03
2 glxinfo:shlo0 0.06 0.03
6 clang 0.05 0.07
3 rocminfo 0.03 0.00
1 lspci 0.00 0.02
1 ps 0.00 0.01
88 sh 0.00 0.00
13 gcc 0.00 0.00
12 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 phoronix-test-s 0.00 0.00
3 gmain 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 dconf worker 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
47 maximum processes
Computation blocks are regular
2637319) dav1d cpu=0 start=5.52 finish=18.44
2637320) dav1d cpu=2 start=5.52 finish=18.44
2637321) dav1d-worker cpu=4 start=5.53 finish=18.44
2637322) dav1d-worker cpu=10 start=5.53 finish=18.44
2637323) dav1d-worker cpu=2 start=5.53 finish=18.44
2637324) dav1d-worker cpu=5 start=5.53 finish=18.44
2637325) dav1d-worker cpu=8 start=5.53 finish=18.43
2637326) dav1d-worker cpu=12 start=5.53 finish=18.43
2637327) dav1d-worker cpu=11 start=5.53 finish=18.43
2637328) dav1d-worker cpu=9 start=5.53 finish=18.43
2637329) dav1d-worker cpu=6 start=5.53 finish=18.43
2637330) dav1d-worker cpu=3 start=5.53 finish=18.43
2637331) dav1d-worker cpu=1 start=5.53 finish=18.43
2637332) dav1d-worker cpu=15 start=5.53 finish=18.43
2637333) dav1d-worker cpu=0 start=5.54 finish=18.43
2637334) dav1d-worker cpu=14 start=5.54 finish=18.43
2637335) dav1d-worker cpu=15 start=5.54 finish=18.43
2637336) dav1d-worker cpu=13 start=5.54 finish=18.43