An Open Source database server that is a redis replacement as a memory store. The test has many configurations and I picked one with 20 clients and five different ratios of read/writes. This appears to hang on my Intel system with no obvious causes (other than a lot of wifi interface issues in syslog.) Profile shows a lot of I/O wait as well as interrupts.
Topdown profile shows backend stalls and frontend stalls at roughly similar ratios with a 20% retirement rate.
AMD metrics show only ~3 cores used, not much floating point
elapsed 1098.123
on_cpu 0.182 # 2.91 / 16 cores
utime 2136.912
stime 1056.417
nvcsw 23918122 # 99.61%
nivcsw 94534 # 0.39%
inblock 0 # 0.00/sec
onblock 15088 # 13.74/sec
cpu-clock 12971200485365 # 12971.200 seconds
task-clock 13008167174499 # 13008.167 seconds
page faults 4074913 # 313.258/sec
context switches 149665213 # 11505.480/sec
cpu migrations 8975598 # 689.997/sec
major page faults 16 # 0.001/sec
minor page faults 4074897 # 313.257/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 8265555923655 # 187.034 branches per 1000 inst
branch misses 236662896331 # 2.86% branch miss
conditional 5119621260643 # 115.847 conditional branches per 1000 inst
indirect 371703877169 # 8.411 indirect branches per 1000 inst
cpu-cycles 80814807480846 # 2.90 GHz
instructions 71114853287286 # 0.88 IPC
slots 160582787387796 #
retiring 24859185583438 # 15.5% (18.4%)
-- ucode 138605826243 # 0.1%
-- fastpath 24720579757195 # 15.4%
frontend 52746936524890 # 32.8% (39.1%)
-- latency 40968756310632 # 25.5%
-- bandwidth 11778180214258 # 7.3%
backend 55894112008895 # 34.8% (41.4%)
-- cpu 5920834715390 # 3.7%
-- memory 49973277293505 # 31.1%
speculation 1436696800352 # 0.9% ( 1.1%)
-- branch mispredict 1406021540212 # 0.9%
-- pipeline restart 30675260140 # 0.0%
smt-contention 25617933291494 # 16.0% ( 0.0%)
cpu-cycles 50316928921807 # 2.86 GHz
instructions 45061442490839 # 0.90 IPC
instructions 14890437861435 # 57.239 l2 access per 1000 inst
l2 hit from l1 727184075817 # 22.78% l2 miss
l2 miss from l1 139402165452 #
l2 hit from l2 pf 70337131879 #
l3 hit from l2 pf 43389273473 #
l3 miss from l2 pf 11397328796 #
instructions 14898190265910 # 21.401 float per 1000 inst
float 512 96 # 0.000 AVX-512 per 1000 inst
float 256 658 # 0.000 AVX-256 per 1000 inst
float 128 318843327322 # 21.401 AVX-128 per 1000 inst
float MMX 0 # 0.000 MMX per 1000 inst
float scalar 1 # 0.000 scalar per 1000 inst
instructions 45078808461884 #
opcache 9034904210347 # 200.425 opcache per 1000 inst
opcache miss 2900738764571 # 32.1% opcache miss rate
l1 dTLB miss 306619447606 # 6.802 L1 dTLB per 1000 inst
l2 dTLB miss 46943276980 # 1.041 L2 dTLB per 1000 inst
instructions 44954439840462 #
icache 3852925593490 # 85.707 icache per 1000 inst
icache miss 1237410413656 # 32.1% icache miss rate
l1 iTLB miss 233059462625 # 5.184 L1 iTLB per 1000 inst
l2 iTLB miss 0 # 0.000 L2 iTLB per 1000 inst
tlb flush 40017580 # 0.001 TLB flush per 1000 inst
Process profile
776 processes
135 memtier_benchma 19406.53 9111.62
15 dragonfly 7708.29 2030.69
15 Proactor2 7708.29 2030.68
15 Proactor5 7708.29 2030.64
15 Proactor4 7708.28 2030.67
15 Proactor7 7708.28 2030.67
15 Proactor3 7708.28 2030.66
15 Proactor0 7708.28 2030.64
15 Proactor6 7708.27 2030.66
15 Proactor1 7708.27 2030.65
15 Proactor14 7708.26 2030.64
15 Proactor10 7708.25 2030.65
15 Proactor12 7708.24 2030.64
15 Proactor8 7708.23 2030.65
15 Proactor9 7708.23 2030.64
15 Proactor11 7708.23 2030.63
15 Proactor13 7708.23 2030.62
15 Proactor15 7708.23 2030.61
68 clinfo 20.01 5.68
38 vulkaninfo 1.67 0.95
4 vulkani:disk$0 0.17 0.10
6 php 0.11 0.21
6 glxinfo:gdrv0 0.10 0.10
6 glxinfo:gl0 0.10 0.10
2 llvmpipe-0 0.09 0.05
2 llvmpipe-1 0.09 0.05
2 llvmpipe-10 0.09 0.05
2 llvmpipe-11 0.09 0.05
2 llvmpipe-12 0.09 0.05
2 llvmpipe-13 0.09 0.05
2 llvmpipe-14 0.09 0.05
2 llvmpipe-15 0.09 0.05
2 llvmpipe-2 0.09 0.05
2 llvmpipe-3 0.09 0.05
2 llvmpipe-4 0.09 0.05
2 llvmpipe-5 0.09 0.05
2 llvmpipe-6 0.09 0.05
2 llvmpipe-7 0.09 0.05
2 llvmpipe-8 0.09 0.05
2 llvmpipe-9 0.09 0.05
6 clang 0.06 0.06
2 glxinfo 0.06 0.04
2 glxinfo:cs0 0.06 0.04
2 glxinfo:disk$0 0.06 0.04
2 glxinfo:sh0 0.06 0.04
2 glxinfo:shlo0 0.06 0.04
3 rocminfo 0.03 0.00
1 lspci 0.00 0.03
1 ps 0.00 0.01
90 sh 0.00 0.00
15 dragonflydb 0.00 0.00
15 sleep 0.00 0.00
13 gcc 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
5 gmain 0.00 0.00
5 phoronix-test-s 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 block looks as follows
924844) dragonflydb cpu=13 start=7.20 finish=74.24
924845) dragonfly cpu=2 start=7.20 finish=74.47
924847) Proactor0 cpu=0 start=7.21 finish=74.47
924848) Proactor1 cpu=1 start=7.21 finish=74.47
924849) Proactor2 cpu=2 start=7.21 finish=74.47
924850) Proactor3 cpu=3 start=7.21 finish=74.47
924851) Proactor4 cpu=4 start=7.21 finish=74.47
924852) Proactor5 cpu=5 start=7.21 finish=74.47
924853) Proactor6 cpu=6 start=7.21 finish=74.47
924854) Proactor7 cpu=7 start=7.21 finish=74.47
924855) Proactor8 cpu=8 start=7.21 finish=74.47
924856) Proactor9 cpu=9 start=7.21 finish=74.47
924857) Proactor10 cpu=10 start=7.21 finish=74.47
924858) Proactor11 cpu=11 start=7.21 finish=74.47
924859) Proactor12 cpu=12 start=7.21 finish=74.47
924860) Proactor13 cpu=13 start=7.21 finish=74.47
924861) Proactor14 cpu=14 start=7.21 finish=74.47
924862) Proactor15 cpu=15 start=7.21 finish=74.47
924846) sleep cpu=11 start=7.20 finish=12.20
924863) memtier_benchma cpu=4 start=12.21 finish=74.24
924864) memtier_benchma cpu=3 start=12.22 finish=72.28
924865) memtier_benchma cpu=10 start=12.22 finish=72.28
924866) memtier_benchma cpu=0 start=12.22 finish=72.28
924867) memtier_benchma cpu=12 start=12.22 finish=72.28
924868) memtier_benchma cpu=5 start=12.22 finish=72.28
924869) memtier_benchma cpu=14 start=12.22 finish=72.28
924870) memtier_benchma cpu=2 start=12.22 finish=72.27
924871) memtier_benchma cpu=11 start=12.22 finish=73.29