Apache benchmark has six different workloads with increasing numbers of concurrent requests also shown with more concurrent processes. The overall time spent in interrupts is higher than other workloads, otherwise CPU cores are kept busy.
Topdown metrics show a lot of time in frontend stalls. A constant and low retirement rate.
AMD topdown metrics with on cpu about 4 cores worth and a lot of context switches. Not much floating point.
elapsed 1509.346
on_cpu 0.220 # 3.52 / 16 cores
utime 573.840
stime 4744.594
nvcsw 44951008 # 45.34%
nivcsw 54184990 # 54.66%
inblock 0 # 0.00/sec
onblock 29792 # 19.74/sec
cpu-clock 19676541323775 # 19676.541 seconds
task-clock 19719318674895 # 19719.319 seconds
page faults 284461013 # 14425.499/sec
context switches 454358925 # 23041.310/sec
cpu migrations 115592313 # 5861.882/sec
major page faults 942757 # 47.809/sec
minor page faults 283518256 # 14377.690/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 6758295849529 # 211.749 branches per 1000 inst
branch misses 799095641827 # 11.82% branch miss
conditional 3637789008753 # 113.978 conditional branches per 1000 inst
indirect 147995495873 # 4.637 indirect branches per 1000 inst
cpu-cycles 77915946609317 # 3.23 GHz
instructions 32290962771129 # 0.41 IPC
slots 154254506163852 #
retiring 12893918613334 # 8.4% ( 9.0%)
-- ucode 83973017436 # 0.1%
-- fastpath 12809945595898 # 8.3%
frontend 100257449117427 # 65.0% (70.3%)
-- latency 82212142241388 # 53.3%
-- bandwidth 18045306876039 # 11.7%
backend 28359866429194 # 18.4% (19.9%)
-- cpu 4582663552209 # 3.0%
-- memory 23777202876985 # 15.4%
speculation 1132261153110 # 0.7% ( 0.8%)
-- branch mispredict 1128091469818 # 0.7%
-- pipeline restart 4169683292 # 0.0%
smt-contention 11597513599477 # 7.5% ( 0.0%)
cpu-cycles 77816961127337 # 3.22 GHz
instructions 32506652562355 # 0.42 IPC
instructions 10709521517503 # 169.776 l2 access per 1000 inst
l2 hit from l1 1489725697344 # 30.94% l2 miss
l2 miss from l1 361201826450 #
l2 hit from l2 pf 127168999107 #
l3 hit from l2 pf 148824282710 #
l3 miss from l2 pf 52496129210 #
instructions 10712155474180 # 11.051 float per 1000 inst
float 512 99 # 0.000 AVX-512 per 1000 inst
float 256 540 # 0.000 AVX-256 per 1000 inst
float 128 118385183778 # 11.051 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 1791.168
on_cpu 0.224 # 3.59 / 16 cores
utime 678.312
stime 5748.159
nvcsw 88888704 # 59.64%
nivcsw 60148521 # 40.36%
inblock 96 # 0.05/sec
onblock 18616 # 10.39/sec
cpu-clock 23302759563125 # 23302.760 seconds
task-clock 23352428926479 # 23352.429 seconds
page faults 348216383 # 14911.356/sec
context switches 557678073 # 23880.945/sec
cpu migrations 199654149 # 8549.610/sec
major page faults 1369530 # 58.646/sec
minor page faults 346846853 # 14852.710/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 6831132246467 # 182.969 branches per 1000 inst
branch misses 75286038756 # 1.10% branch miss
conditional 6831132375619 # 182.969 conditional branches per 1000 inst
indirect 1731845496944 # 46.387 indirect branches per 1000 inst
slots 94143096190466 #
retiring 20164455696645 # 21.4% (21.4%)
-- ucode 3374369293277 # 3.6%
-- fastpath 16790086403368 # 17.8%
frontend 39152021412138 # 41.6% (41.6%)
-- latency 27001499422697 # 28.7%
-- bandwidth 12150521989441 # 12.9%
backend 31775642691837 # 33.8% (33.8%)
-- cpu 8124393282042 # 8.6%
-- memory 23651249409795 # 25.1%
speculation 3892549696503 # 4.1% ( 4.1%)
-- branch mispredict 3486065436745 # 3.7%
-- pipeline restart 406484259758 # 0.4%
smt-contention 0 # 0.0% ( 0.0%)
cpu-cycles 62935596128790 # 2.61 GHz
instructions 37441908212762 # 0.59 IPC
l2 access 2517537664684 # 137.746 l2 access per 1000 inst
l2 miss 848413614451 # 33.70% l2 miss
Process overview shows we have (and reuse) httpd processes and wrk processes.
3286 processes
2594 httpd 83589.41 302478.62
258 wrk 10120.92 81770.17
68 clinfo 20.51 5.98
38 vulkaninfo 1.33 1.33
6 glxinfo:gdrv0 0.17 0.07
4 vulkani:disk$0 0.14 0.14
6 php 0.10 0.28
2 glxinfo 0.09 0.03
2 glxinfo:cs0 0.08 0.03
2 glxinfo:disk$0 0.08 0.03
2 glxinfo:sh0 0.08 0.03
2 glxinfo:shlo0 0.08 0.03
2 llvmpipe-0 0.07 0.07
2 llvmpipe-1 0.07 0.07
2 llvmpipe-10 0.07 0.07
2 llvmpipe-11 0.07 0.07
2 llvmpipe-12 0.07 0.07
2 llvmpipe-13 0.07 0.07
2 llvmpipe-14 0.07 0.07
2 llvmpipe-15 0.07 0.07
2 llvmpipe-2 0.07 0.07
2 llvmpipe-3 0.07 0.07
2 llvmpipe-4 0.07 0.07
2 llvmpipe-5 0.07 0.07
2 llvmpipe-6 0.07 0.07
2 llvmpipe-7 0.07 0.07
2 llvmpipe-8 0.07 0.07
2 llvmpipe-9 0.07 0.07
6 clang 0.05 0.07
3 rocminfo 0.03 0.00
1 lspci 0.01 0.02
102 sh 0.00 0.00
24 apachectl 0.00 0.00
18 apache 0.00 0.00
13 gcc 0.00 0.00
12 bash 0.00 0.00
12 sleep 0.00 0.00
9 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
6 rm 0.00 0.00
5 phoronix-test-s 0.00 0.00
4 gmain 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 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
461 maximum processes