A test of file-system calls for testing disk performance. There are six different configurations and I picked the second smallest one. It produces one result. An interesting diviion of how many runnable processes up to the “6” I provided. Also a high amount of I/O wait as expected.
System profile shows that frontend stalls predominate.
AMD metrics show a high frontend rate with a high opcache miss, not much floating point and medium L2 acces.
elapsed 2176.538
on_cpu 0.189 # 3.02 / 16 cores
utime 843.344
stime 5722.115
nvcsw 39343228 # 91.98%
nivcsw 3431889 # 8.02%
inblock 16 # 0.01/sec
onblock 1951980816 # 896828.18/sec
cpu-clock 6544199386258 # 6544.199 seconds
task-clock 6557405231180 # 6557.405 seconds
page faults 149116 # 22.740/sec
context switches 42785835 # 6524.812/sec
cpu migrations 246100 # 37.530/sec
major page faults 13 # 0.002/sec
minor page faults 149103 # 22.738/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 5369777313397 # 201.000 branches per 1000 inst
branch misses 498901061495 # 9.29% branch miss
conditional 2985957828338 # 111.770 conditional branches per 1000 inst
indirect 120006447001 # 4.492 indirect branches per 1000 inst
cpu-cycles 26885010670698 # 0.77 GHz
instructions 26691633015506 # 0.99 IPC
slots 53800271237178 #
retiring 9965806851258 # 18.5% (18.7%)
-- ucode 45841046628 # 0.1%
-- fastpath 9919965804630 # 18.4%
frontend 36762333555880 # 68.3% (68.9%) high
-- latency 30194936859138 # 56.1%
-- bandwidth 6567396696742 # 12.2%
backend 6261672572771 # 11.6% (11.7%) low
-- cpu 1445619174398 # 2.7%
-- memory 4816053398373 # 9.0%
speculation 368537694187 # 0.7% ( 0.7%) low
-- branch mispredict 368086932974 # 0.7%
-- pipeline restart 450761213 # 0.0%
smt-contention 441420103436 # 0.8% ( 0.0%)
cpu-cycles 26872006595681 # 0.77 GHz
instructions 26663335352982 # 0.99 IPC
instructions 8880068374203 # 63.906 l2 access per 1000 inst
l2 hit from l1 507717865287 # 12.11% l2 miss
l2 miss from l1 44342179500 #
l2 hit from l2 pf 35398150037 #
l3 hit from l2 pf 11069911894 #
l3 miss from l2 pf 13300450922 #
instructions 8889672813205 # 23.840 float per 1000 inst
float 512 60 # 0.000 AVX-512 per 1000 inst
float 256 404 # 0.000 AVX-256 per 1000 inst
float 128 211927312478 # 23.840 AVX-128 per 1000 inst
float MMX 0 # 0.000 MMX per 1000 inst
float scalar 0 # 0.000 scalar per 1000 inst
instructions 26623999186545 #
opcache 8116073436265 # 304.841 opcache per 1000 inst
opcache miss 4676200238691 # 57.6% opcache miss rate
l1 dTLB miss 47731066114 # 1.793 L1 dTLB per 1000 inst
l2 dTLB miss 1783025545 # 0.067 L2 dTLB per 1000 inst
instructions 26698545195061 #
icache 10188477109326 # 381.612 icache per 1000 inst
icache miss 1097498334140 # 10.8% icache miss rate
l1 iTLB miss 1220522879 # 0.046 L1 iTLB per 1000 inst
l2 iTLB miss 0 # 0.000 L2 iTLB per 1000 inst
tlb flush 59672 # 0.000 TLB flush per 1000 inst
Intel metrics
elapsed 2177.876
on_cpu 0.048 # 0.77 / 16 cores
utime 325.393
stime 1352.528
nvcsw 5320085 # 92.93%
nivcsw 404512 # 7.07%
inblock 1056 # 0.48/sec
onblock 273288160 # 125483.80/sec
cpu-clock 1631494311265 # 1631.494 seconds
task-clock 1639148551423 # 1639.149 seconds
page faults 139350 # 85.014/sec
context switches 5735488 # 3499.065/sec
cpu migrations 872210 # 532.112/sec
major page faults 2 # 0.001/sec
minor page faults 139347 # 85.012/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 587123993695 # 175.735 branches per 1000 inst
branch misses 4102810713 # 0.70% branch miss
conditional 587124006175 # 175.735 conditional branches per 1000 inst
indirect 66106187961 # 19.787 indirect branches per 1000 inst
slots 8690665163174 #
retiring 2837400948150 # 32.6% (32.6%)
-- ucode 338512018229 # 3.9%
-- fastpath 2498888929921 # 28.8%
frontend 2763739105775 # 31.8% (31.8%)
-- latency 1232575523042 # 14.2%
-- bandwidth 1531163582733 # 17.6%
backend 2728568799830 # 31.4% (31.4%)
-- cpu 999833389376 # 11.5%
-- memory 1728735410454 # 19.9%
speculation 269154958294 # 3.1% ( 3.1%)
-- branch mispredict 217893008638 # 2.5%
-- pipeline restart 51261949656 # 0.6%
smt-contention 0 # 0.0% ( 0.0%)
cpu-cycles 1917863811967 # 0.05 GHz
instructions 3664555557015 # 1.91 IPC
l2 access 153603328933 # 53.640 l2 access per 1000 inst
l2 miss 30185565429 # 19.65% l2 miss
cpu-cycles 1484726815764 # 25.0% memory latency
load stalls 344343365955 # 5.6% l1 bound
l1 miss 261227496127 # 7.8% l2 bound
l2 miss 144992619062 # 5.7% l3 bound
l3 miss 60295458648 # 4.1% dram bound
store_stalls 27032209086 # 1.8% store bound
Process profile
374 processes
24 dbench 848.15 5644.25
68 clinfo 16.53 6.65
38 vulkaninfo 1.52 0.95
6 php 0.21 0.12
4 vulkani:disk$0 0.16 0.10
6 glxinfo:gdrv0 0.12 0.04
6 glxinfo:gl0 0.12 0.04
2 llvmpipe-0 0.08 0.05
2 llvmpipe-1 0.08 0.05
2 llvmpipe-10 0.08 0.05
2 llvmpipe-11 0.08 0.05
2 llvmpipe-12 0.08 0.05
2 llvmpipe-13 0.08 0.05
2 llvmpipe-14 0.08 0.05
2 llvmpipe-15 0.08 0.05
2 llvmpipe-2 0.08 0.05
2 llvmpipe-3 0.08 0.05
2 llvmpipe-4 0.08 0.05
2 llvmpipe-5 0.08 0.05
2 llvmpipe-6 0.08 0.05
2 llvmpipe-7 0.08 0.05
2 llvmpipe-8 0.08 0.05
2 llvmpipe-9 0.08 0.05
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
6 clang 0.05 0.07
3 rocminfo 0.00 0.03
1 lspci 0.00 0.02
1 ps 0.00 0.01
83 sh 0.00 0.00
13 gcc 0.00 0.00
10 gsettings 0.00 0.00
9 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
4 gmain 0.00 0.00
2 cc 0.00 0.00
2 dconf worker 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
47 maximum processes
Computation structures
894708) dbench cpu=2 start=5.76 finish=725.95
894709) dbench cpu=7 start=5.77 finish=725.95
894710) dbench cpu=14 start=5.77 finish=725.95
894711) dbench cpu=5 start=5.77 finish=725.95
894712) dbench cpu=1 start=5.77 finish=725.95
894713) dbench cpu=0 start=5.77 finish=725.95
894714) dbench cpu=15 start=5.77 finish=725.95
894715) dbench cpu=2 start=5.77 finish=725.95