xz is a SPEC CPU(R) benchmark written in C and described here. The workload runs on all logical cores.
Topdown profile shows a mixture of patterns, separate invocations? Several are dominated by backend stalls, others have more moderate retirement rate.
AMD metrics on 7840 confirm a 40% time spent in backend stalls.
elapsed 1413.262
on_cpu 0.985 # 15.76 / 16 cores
utime 22190.676
stime 80.712
nvcsw 32429 # 15.28%
nivcsw 179827 # 84.72%
inblock 0 # 0.00/sec
onblock 16224 # 11.48/sec
cpu-clock 22272829155088 # 22272.829 seconds
task-clock 22272971535008 # 22272.972 seconds
page faults 30366431 # 1363.376/sec
context switches 211245 # 9.484/sec
cpu migrations 308 # 0.014/sec
major page faults 1859 # 0.083/sec
minor page faults 30364572 # 1363.292/sec
alignment faults 0 # 0.000/sec
emulation faults 0 # 0.000/sec
branches 8835980080090 # 115.607 branches per 1000 inst
branch misses 400050420474 # 4.53% branch miss
conditional 8020681407191 # 104.940 conditional branches per 1000 inst
indirect 102437988137 # 1.340 indirect branches per 1000 inst
cpu-cycles 99542805444678 # 4.41 GHz
instructions 76459027618205 # 0.77 IPC
slots 199034406547422 #
retiring 25007933242215 # 12.6% (19.4%)
-- ucode 9082417521 # 0.0%
-- fastpath 24998850824694 # 12.6%
frontend 12250748557591 # 6.2% ( 9.5%)
-- latency 8927773104210 # 4.5%
-- bandwidth 3322975453381 # 1.7%
backend 83594205106690 # 42.0% (64.8%)
-- cpu 4410158936378 # 2.2%
-- memory 79184046170312 # 39.8%
speculation 8145268353751 # 4.1% ( 6.3%)
-- branch mispredict 8111088189146 # 4.1%
-- pipeline restart 34180164605 # 0.0%
smt-contention 70036180616910 # 35.2% ( 0.0%)
cpu-cycles 99654865202476 # 4.38 GHz
instructions 76432260626044 # 0.77 IPC
instructions 25476490458593 # 23.253 l2 access per 1000 inst
l2 hit from l1 463932078609 # 30.11% l2 miss
l2 miss from l1 105562068767 #
l2 hit from l2 pf 55657371236 #
l3 hit from l2 pf 20795496614 #
l3 miss from l2 pf 52023516791 #
instructions 25468766780522 # 21.356 float per 1000 inst
float 512 494 # 0.000 AVX-512 per 1000 inst
float 256 7138 # 0.000 AVX-256 per 1000 inst
float 128 543923656222 # 21.356 AVX-128 per 1000 inst
float MMX 0 # 0.000 MMX per 1000 inst
float scalar 62 # 0.000 scalar per 1000 inst
instructions 76418964558481 #
opcache 11659264508468 # 152.570 opcache per 1000 inst
opcache miss 120217644516 # 1.0% opcache miss rate
l1 dTLB miss 605368087508 # 7.922 L1 dTLB per 1000 inst
l2 dTLB miss 103705778625 # 1.357 L2 dTLB per 1000 inst
instructions 76419112519088 #
icache 208931580918 # 2.734 icache per 1000 inst
icache miss 37140932573 # 17.8% icache miss rate
l1 iTLB miss 335027956 # 0.004 L1 iTLB per 1000 inst
l2 iTLB miss 0 # 0.000 L2 iTLB per 1000 inst
tlb flush 127274 # 0.000 TLB flush per 1000 inst
Process overview shows three copies per benchmark, corresponding to profiles above.
1059 processes
143 xz_r_base.mev-a 21915.42 63.60
164 specperl 20.24 3.10
1 clang 0.01 0.00
41 specinvoke 0.00 0.04
11 ps 0.00 0.02
362 sh 0.00 0.00
142 bash 0.00 0.00
54 specrxp 0.00 0.00
21 grep 0.00 0.00
20 cat 0.00 0.00
12 uniq 0.00 0.00
11 sort 0.00 0.00
10 expand 0.00 0.00
6 pwd 0.00 0.00
5 basename 0.00 0.00
5 specmake 0.00 0.00
5 systemctl 0.00 0.00
4 specpp 0.00 0.00
4 uname 0.00 0.00
3 dirname 0.00 0.00
3 dmidecode 0.00 0.00
3 lscpu 0.00 0.00
2 df 0.00 0.00
2 dpkg 0.00 0.00
2 rm 0.00 0.00
2 runcpu 0.00 0.00
2 specsha512sum 0.00 0.00
2 specxz 0.00 0.00
2 who 0.00 0.00
1 cpupower 0.00 0.00
1 head 0.00 0.00
1 logname 0.00 0.00
1 ls 0.00 0.00
1 lsb_release 0.00 0.00
1 numactl 0.00 0.00
1 sysctl 0.00 0.00
1 w 0.00 0.00
1 wc 0.00 0.00
1 which 0.00 0.00
2 processes running
54 maximum processes
specinvoke fires off separate copies on each logical core
72891) specinvoke cpu=2 start=3.38 finish=467.09
72893) sh cpu=0 start=3.38 finish=197.18
72899) bash cpu=0 start=3.38 finish=197.18
72924) xz_r_base.mev-a cpu=0 start=3.38 finish=197.11
72894) sh cpu=1 start=3.38 finish=198.36
72901) bash cpu=1 start=3.38 finish=198.36
72925) xz_r_base.mev-a cpu=1 start=3.38 finish=198.29
72895) sh cpu=2 start=3.38 finish=197.79
72906) bash cpu=2 start=3.38 finish=197.79
72929) xz_r_base.mev-a cpu=2 start=3.38 finish=197.72
72896) sh cpu=3 start=3.38 finish=199.71
72902) bash cpu=3 start=3.38 finish=199.71
72923) xz_r_base.mev-a cpu=3 start=3.38 finish=199.64
72897) sh cpu=4 start=3.38 finish=200.78
72909) ?? cpu=0 start=3.38 finish=0.00
72931) xz_r_base.mev-a cpu=4 start=3.38 finish=200.71
72898) sh cpu=5 start=3.38 finish=196.56
72904) bash cpu=5 start=3.38 finish=196.56
72928) xz_r_base.mev-a cpu=5 start=3.38 finish=196.49
72900) sh cpu=6 start=3.38 finish=200.04
72907) bash cpu=6 start=3.38 finish=200.04
72930) xz_r_base.mev-a cpu=6 start=3.38 finish=199.96
72903) sh cpu=7 start=3.38 finish=199.53
72911) bash cpu=7 start=3.38 finish=199.53
72932) xz_r_base.mev-a cpu=7 start=3.38 finish=199.46
72905) sh cpu=8 start=3.38 finish=197.07
72914) bash cpu=8 start=3.38 finish=197.07
72933) xz_r_base.mev-a cpu=8 start=3.38 finish=197.00
72908) sh cpu=9 start=3.38 finish=198.40
72917) bash cpu=9 start=3.38 finish=198.40
72934) xz_r_base.mev-a cpu=9 start=3.38 finish=198.34
72910) sh cpu=10 start=3.38 finish=197.73
72919) bash cpu=10 start=3.38 finish=197.73
72938) xz_r_base.mev-a cpu=10 start=3.38 finish=197.67
72912) sh cpu=11 start=3.38 finish=201.10
72920) bash cpu=11 start=3.38 finish=201.10
72937) xz_r_base.mev-a cpu=11 start=3.38 finish=201.03
72913) sh cpu=12 start=3.38 finish=200.53
72921) bash cpu=12 start=3.38 finish=200.53
72935) xz_r_base.mev-a cpu=12 start=3.38 finish=200.46
72915) sh cpu=13 start=3.38 finish=196.95
72922) bash cpu=13 start=3.38 finish=196.95
72936) xz_r_base.mev-a cpu=13 start=3.38 finish=196.88
72916) sh cpu=14 start=3.38 finish=201.27
72926) bash cpu=14 start=3.38 finish=201.27
72939) xz_r_base.mev-a cpu=14 start=3.38 finish=201.20
72918) sh cpu=15 start=3.38 finish=199.85
72927) bash cpu=15 start=3.38 finish=199.85
72940) xz_r_base.mev-a cpu=15 start=3.38 finish=199.78
72942) sh cpu=5 start=196.56 finish=330.05
72943) bash cpu=5 start=196.56 finish=330.05
72944) xz_r_base.mev-a cpu=5 start=196.56 finish=329.98
72945) sh cpu=13 start=196.95 finish=327.88
72946) bash cpu=13 start=196.96 finish=327.88
72947) xz_r_base.mev-a cpu=13 start=196.96 finish=327.81
72948) sh cpu=8 start=197.07 finish=329.51
72949) bash cpu=8 start=197.07 finish=329.51
72950) xz_r_base.mev-a cpu=8 start=197.07 finish=329.44
72951) sh cpu=0 start=197.18 finish=329.49
72952) bash cpu=0 start=197.18 finish=329.49
72953) xz_r_base.mev-a cpu=0 start=197.18 finish=329.42
72954) sh cpu=10 start=197.74 finish=324.20
72955) bash cpu=10 start=197.74 finish=324.20
72956) xz_r_base.mev-a cpu=10 start=197.74 finish=324.13
72957) sh cpu=2 start=197.79 finish=328.08
72958) bash cpu=2 start=197.79 finish=328.08
72959) xz_r_base.mev-a cpu=2 start=197.79 finish=328.02
72960) sh cpu=1 start=198.36 finish=328.48
72961) bash cpu=1 start=198.36 finish=328.48
72962) xz_r_base.mev-a cpu=1 start=198.36 finish=328.42
72963) sh cpu=9 start=198.40 finish=327.91
72964) bash cpu=9 start=198.40 finish=327.91
72965) xz_r_base.mev-a cpu=9 start=198.41 finish=327.84
72966) sh cpu=7 start=199.53 finish=330.72
72967) bash cpu=7 start=199.53 finish=330.72
72968) xz_r_base.mev-a cpu=7 start=199.54 finish=330.64
72969) sh cpu=3 start=199.71 finish=331.64
72970) bash cpu=3 start=199.71 finish=331.64
72971) xz_r_base.mev-a cpu=3 start=199.72 finish=331.57
72972) sh cpu=15 start=199.85 finish=330.73
72973) bash cpu=15 start=199.85 finish=330.73
72974) xz_r_base.mev-a cpu=15 start=199.85 finish=330.67
72975) sh cpu=6 start=200.04 finish=329.46
72976) bash cpu=6 start=200.04 finish=329.46
72977) xz_r_base.mev-a cpu=6 start=200.04 finish=329.39
72978) sh cpu=12 start=200.53 finish=331.00
72979) bash cpu=12 start=200.53 finish=331.00
72980) xz_r_base.mev-a cpu=12 start=200.54 finish=330.93
72981) sh cpu=4 start=200.78 finish=331.31
72982) bash cpu=4 start=200.78 finish=331.31
72983) xz_r_base.mev-a cpu=4 start=200.78 finish=331.25
72984) sh cpu=11 start=201.10 finish=332.58
72985) bash cpu=11 start=201.10 finish=332.58
72986) xz_r_base.mev-a cpu=11 start=201.10 finish=332.51
72987) sh cpu=14 start=201.27 finish=327.62
72988) bash cpu=14 start=201.27 finish=327.62
72989) xz_r_base.mev-a cpu=14 start=201.28 finish=327.56
72990) sh cpu=10 start=324.20 finish=458.38
72991) bash cpu=10 start=324.20 finish=458.38
72992) xz_r_base.mev-a cpu=10 start=324.20 finish=458.32
72993) sh cpu=14 start=327.62 finish=463.25
72994) bash cpu=14 start=327.62 finish=463.25
72995) xz_r_base.mev-a cpu=14 start=327.62 finish=463.18
72996) sh cpu=13 start=327.88 finish=464.83
72997) bash cpu=13 start=327.88 finish=464.83
72998) xz_r_base.mev-a cpu=13 start=327.88 finish=464.76
72999) sh cpu=9 start=327.91 finish=462.41
73000) bash cpu=9 start=327.91 finish=462.41
73001) xz_r_base.mev-a cpu=9 start=327.92 finish=462.34
73002) sh cpu=2 start=328.08 finish=461.42
73003) bash cpu=2 start=328.08 finish=461.42
73004) xz_r_base.mev-a cpu=2 start=328.09 finish=461.37
73005) sh cpu=1 start=328.48 finish=462.96
73006) bash cpu=1 start=328.48 finish=462.96
73007) xz_r_base.mev-a cpu=1 start=328.49 finish=462.90
73008) sh cpu=6 start=329.46 finish=464.42
73009) bash cpu=6 start=329.46 finish=464.42
73010) xz_r_base.mev-a cpu=6 start=329.46 finish=464.37
73011) sh cpu=0 start=329.49 finish=463.63
73012) bash cpu=0 start=329.49 finish=463.63
73013) xz_r_base.mev-a cpu=0 start=329.49 finish=463.56
73014) sh cpu=8 start=329.51 finish=464.08
73015) bash cpu=8 start=329.51 finish=464.08
73016) xz_r_base.mev-a cpu=8 start=329.51 finish=464.03
73017) sh cpu=5 start=330.05 finish=466.11
73018) bash cpu=5 start=330.05 finish=466.11
73019) xz_r_base.mev-a cpu=5 start=330.05 finish=466.06
73020) sh cpu=7 start=330.72 finish=466.35
73021) bash cpu=7 start=330.72 finish=466.35
73022) xz_r_base.mev-a cpu=7 start=330.72 finish=466.29
73023) sh cpu=15 start=330.73 finish=466.33
73024) bash cpu=15 start=330.73 finish=466.33
73025) xz_r_base.mev-a cpu=15 start=330.74 finish=466.26
73026) sh cpu=12 start=331.00 finish=465.28
73027) bash cpu=12 start=331.00 finish=465.28
73028) xz_r_base.mev-a cpu=12 start=331.00 finish=465.23
73029) sh cpu=4 start=331.31 finish=465.58
73030) bash cpu=4 start=331.32 finish=465.58
73031) xz_r_base.mev-a cpu=4 start=331.32 finish=465.54
73032) sh cpu=3 start=331.64 finish=466.62
73033) bash cpu=3 start=331.64 finish=466.61
73034) xz_r_base.mev-a cpu=3 start=331.65 finish=466.56
73035) sh cpu=11 start=332.58 finish=467.09
73036) bash cpu=11 start=332.58 finish=467.09
73037) xz_r_base.mev-a cpu=11 start=332.58 finish=467.05