performance bottlenecks on lock transactionid

hello,

We used benchmarksql 4.1.0 to test the performance of PG12 beta TPCC.

We found performance bottlenecks on lock transactionid.

help,

We hope to find a way to solve this bottleneck in order to improve performance.

Here are some of our configurations. Including operating system, PG database, and benchmark SQL：

database：

pgsql 12 beta2

Lock queues at runtime and top in the attachment。

operating system：

uname -a

Linux localhost.localdomain 4.20.0 #1 SMP Mon Mar 11 23:13:55 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/issue

\S

Kernel \r on an \m

$ cat /proc/version

Linux version 4.20.0 (root(at)localhost(dot)localdomain) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC)) #1 SMP Mon Mar 11 23:13:55 EDT 2019

$ lscpu

Architecture: x86_64

CPU op-mode(s): 32-bit, 64-bit

Byte Order: Little Endian

CPU(s): 112

On-line CPU(s) list: 0-111

Thread(s) per core: 2

Core(s) per socket: 28

Socket(s): 2

NUMA node(s): 2

Vendor ID: GenuineIntel

CPU family: 6

Model: 85

Model name: Intel(R) Xeon(R) Platinum 8280L CPU @ 2.60GHz

Stepping: 5

CPU MHz: 1000.006

CPU max MHz: 3900.0000

CPU min MHz: 1000.0000

BogoMIPS: 5200.00

Virtualization: VT-x

L1d cache: 32K

L1i cache: 32K

L2 cache: 1024K

L3 cache: 39424K

NUMA node0 CPU(s): 0-27,56-83

NUMA node1 CPU(s): 28-55,84-111

Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke flush_l1d arch_capabilities

benchmarksql：

version：4.1.0

result：

driver=org.postgresql.Driver

conn=jdbc:postgresql://localhost:5432/postgres

user=SYSTEM

warehouses=100

terminals=300

runMins=30

limitTxnsPerMin=0

newOrderWeight=45

paymentWeight=43

orderStatusWeight=4

deliveryWeight=4

stockLevelWeight=4

Measured tpmC (NewOrders) = 543598.69

Measured tpmTOTAL = 1205694.86

Session Start = 2019-07-31 01:27:22

Session End = 2019-07-31 01:57:23

Transaction Count = 36191623