pepijnve commented on PR #23211:
URL: https://github.com/apache/datafusion/pull/23211#issuecomment-4918555828
I'm getting similar results on our lab cluster.
<details>
<summary>lscpu output</summary>
```
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 45 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Vendor ID: AuthenticAMD
Model name: AMD EPYC 9254 24-Core Processor
CPU family: 25
Model: 17
Thread(s) per core: 1
Core(s) per socket: 8
Socket(s): 1
Stepping: 1
BogoMIPS: 5799.97
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
pdpe1gb rdtscp lm constant_tsc rep_good nopl tsc_reliable nons
top_tsc cpuid extd_apicid tsc_known_freq pni
pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx
f16c rdrand hypervisor lahf_lm cmp_legacy extapic cr8_legacy abm ss
e4a misalignsse 3dnowprefetch osvw topoext ssbd
ibrs ibpb ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid
avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd
sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1
xsaves avx512_bf16 clzero wbnoinvd arat avx512vbmi umip pku ospke avx512_vbmi2
gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcnt
dq rdpid overflow_recov succor fsrm flush_l1d
Virtualization features:
Hypervisor vendor: VMware
Virtualization type: full
Caches (sum of all):
L1d: 256 KiB (8 instances)
L1i: 256 KiB (8 instances)
L2: 8 MiB (8 instances)
L3: 32 MiB (1 instance)
NUMA:
NUMA node(s): 1
NUMA node0 CPU(s): 0-7
Vulnerabilities:
Gather data sampling: Not affected
Itlb multihit: Not affected
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Not affected
Retbleed: Not affected
Spec rstack overflow: Vulnerable: Safe RET, no microcode
Spec store bypass: Mitigation; Speculative Store Bypass disabled via
prctl
Spectre v1: Mitigation; usercopy/swapgs barriers and __user
pointer sanitization
Spectre v2: Mitigation; Enhanced / Automatic IBRS, IBPB
conditional, STIBP disabled, RSB filling, PBRSB-eIBRS Not affected
Srbds: Not affected
Tsx async abort: Not affected
```
</details>
```
Gnuplot not found, using plotters backend
concat_utf8view/concat/nulls_0
time: [68.636 µs 69.287 µs 69.943 µs]
change: [−21.238% −20.534% −19.832%] (p = 0.00 <
0.05)
Performance has improved.
Found 7 outliers among 100 measurements (7.00%)
7 (7.00%) high mild
concat_utf8view/concat/nulls_10
time: [77.926 µs 78.361 µs 78.748 µs]
change: [−21.903% −21.249% −20.584%] (p = 0.00 <
0.05)
Performance has improved.
concat_utf8view/concat/nulls_50
time: [40.294 µs 40.491 µs 40.696 µs]
change: [−23.471% −22.878% −22.324%] (p = 0.00 <
0.05)
Performance has improved.
```
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