Video encoding using the Google libvpx library. There are four workloads, two for each of two speed levels and then for 4K and 1080p decoding. Looks like variable numbers of processes though one per physical core.
Topdown profil has slight differences in workloads, though fairly high retirement rate with backend stalls being the largest limiter.
AMD metrics show floating point code with some memory bound stalls. There are few branches, though still branch misprediction.
elapsed 623.409
on_cpu 0.311 # 4.97 / 16 cores
utime 3048.837
stime 48.411
nvcsw 3637285 # 99.86%
nivcsw 5119 # 0.14%
inblock 0 # 0.00/sec
onblock 15512 # 24.88/sec
cpu-clock 3089203964534 # 3089.204 seconds
task-clock 3091077405978 # 3091.077 seconds
page faults 2123880 # 687.100/sec
context switches 3645325 # 1179.306/sec
cpu migrations 3420 # 1.106/sec
major page faults 2 # 0.001/sec
minor page faults 2123878 # 687.100/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 1721188727239 # 52.252 branches per 1000 inst
branch misses 26850172244 # 1.56% branch miss
conditional 1385965910144 # 42.075 conditional branches per 1000 inst
indirect 56654184709 # 1.720 indirect branches per 1000 inst
cpu-cycles 12148882895870 # 1.24 GHz
instructions 32948907414886 # 2.71 IPC
slots 24279285092832 #
retiring 11013916606615 # 45.4% (45.6%)
-- ucode 20225750600 # 0.1%
-- fastpath 10993690856015 # 45.3%
frontend 3545739782724 # 14.6% (14.7%)
-- latency 1451506674132 # 6.0%
-- bandwidth 2094233108592 # 8.6%
backend 8701349022251 # 35.8% (36.0%)
-- cpu 3205982477495 # 13.2%
-- memory 5495366544756 # 22.6%
speculation 891925444057 # 3.7% ( 3.7%)
-- branch mispredict 844250791145 # 3.5%
-- pipeline restart 47674652912 # 0.2%
smt-contention 126338239440 # 0.5% ( 0.0%)
cpu-cycles 12134150872890 # 1.24 GHz
instructions 32940470679251 # 2.71 IPC
instructions 10979290279131 # 40.403 l2 access per 1000 inst
l2 hit from l1 383961375679 # 16.06% l2 miss
l2 miss from l1 52653668633 #
l2 hit from l2 pf 41052024947 #
l3 hit from l2 pf 14381078758 #
l3 miss from l2 pf 4198549610 #
instructions 10981114496824 # 243.225 float per 1000 inst
float 512 58 # 0.000 AVX-512 per 1000 inst
float 256 514 # 0.000 AVX-256 per 1000 inst
float 128 2670880984964 # 243.225 AVX-128 per 1000 inst
float MMX 0 # 0.000 MMX per 1000 inst
float scalar 2469 # 0.000 scalar per 1000 inst
instructions 2686249 #
opcache 993457 # 369.831 opcache per 1000 inst
opcache miss 533742 # 53.7% opcache miss rate
l1 dTLB miss 6511 # 2.424 L1 dTLB per 1000 inst
l2 dTLB miss 1193 # 0.444 L2 dTLB per 1000 inst
instructions 2738555 #
icache 1323391 # 483.244 icache per 1000 inst
icache miss 110104 # 8.3% icache miss rate
l1 iTLB miss 6 # 0.002 L1 iTLB per 1000 inst
l2 iTLB miss 0 # 0.000 L2 iTLB per 1000 inst
tlb flush 19 # 0.007 TLB flush per 1000 inst
Intel metrics show L2 cache as most active stalls for memory
elapsed 1393.848
on_cpu 0.320 # 5.12 / 16 cores
utime 7051.575
stime 81.121
nvcsw 5955297 # 98.67%
nivcsw 80192 # 1.33%
inblock 20984032 # 15054.75/sec
onblock 5464 # 3.92/sec
cpu-clock 7093046110780 # 7093.046 seconds
task-clock 7096878999736 # 7096.879 seconds
page faults 2495483 # 351.631/sec
context switches 6042276 # 851.399/sec
cpu migrations 163180 # 22.993/sec
major page faults 2861 # 0.403/sec
minor page faults 2492622 # 351.228/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 2459209749628 # 50.743 branches per 1000 inst
branch misses 44820326405 # 1.82% branch miss
conditional 2459209765468 # 50.743 conditional branches per 1000 inst
indirect 620204202405 # 12.797 indirect branches per 1000 inst
slots 49219054467146 #
retiring 23760356174046 # 48.3% (48.3%)
-- ucode 1008550311918 # 2.0%
-- fastpath 22751805862128 # 46.2%
frontend 6378237707292 # 13.0% (13.0%)
-- latency 3046542845679 # 6.2%
-- bandwidth 3331694861613 # 6.8%
backend 16273030130206 # 33.1% (33.1%)
-- cpu 9088240401088 # 18.5%
-- memory 7184789729118 # 14.6%
speculation 3130243686700 # 6.4% ( 6.4%)
-- branch mispredict 2944870071324 # 6.0%
-- pipeline restart 185373615376 # 0.4%
smt-contention 0 # 0.0% ( 0.0%)
cpu-cycles 16282458738408 # 1.01 GHz
instructions 44439229330649 # 2.73 IPC
l2 access 902938123881 # 39.431 l2 access per 1000 inst
l2 miss 264018120167 # 29.24% l2 miss
cpu-cycles 8391353786130 # 21.0% memory latency
load stalls 1601500730217 # 0.0% l1 bound
l1 miss 1707146006108 # 12.4% l2 bound
l2 miss 668404285722 # 4.3% l3 bound
l3 miss 305217164369 # 3.6% dram bound
store_stalls 158271209456 # 1.9% store bound
Process overview shows vpxenc as the primary process
450 processes
96 vpxenc 23832.39 254.91
68 clinfo 17.20 5.33
38 vulkaninfo 1.14 1.14
4 vulkani:disk$0 0.12 0.12
6 glxinfo:gdrv0 0.10 0.04
6 glxinfo:gl0 0.10 0.04
6 clang 0.10 0.01
6 php 0.07 0.17
2 llvmpipe-0 0.06 0.06
2 llvmpipe-1 0.06 0.06
2 llvmpipe-10 0.06 0.06
2 llvmpipe-11 0.06 0.06
2 llvmpipe-12 0.06 0.06
2 llvmpipe-13 0.06 0.06
2 llvmpipe-14 0.06 0.06
2 llvmpipe-15 0.06 0.06
2 llvmpipe-2 0.06 0.06
2 llvmpipe-3 0.06 0.06
2 llvmpipe-4 0.06 0.06
2 llvmpipe-5 0.06 0.06
2 llvmpipe-6 0.06 0.06
2 llvmpipe-7 0.06 0.06
2 llvmpipe-8 0.06 0.06
2 llvmpipe-9 0.06 0.06
2 glxinfo 0.06 0.02
2 glxinfo:cs0 0.06 0.02
2 glxinfo:disk$0 0.06 0.02
2 glxinfo:sh0 0.06 0.02
2 glxinfo:shlo0 0.06 0.02
3 rocminfo 0.03 0.00
1 lspci 0.00 0.02
88 sh 0.00 0.00
13 gcc 0.00 0.00
13 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
2 cc 0.00 0.00
2 gmain 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 ps 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 structure is straightforward.
333831) vpxenc cpu=11 start=6.65 finish=91.46
333832) vpxenc cpu=11 start=6.66 finish=91.46
333833) vpxenc cpu=2 start=7.15 finish=91.41
333834) vpxenc cpu=12 start=7.15 finish=91.41
333835) vpxenc cpu=7 start=7.16 finish=91.41
333836) vpxenc cpu=1 start=7.16 finish=91.41
333837) vpxenc cpu=5 start=7.16 finish=91.41
333838) vpxenc cpu=6 start=7.16 finish=91.41
333839) vpxenc cpu=0 start=7.17 finish=91.41