date_utc:        2026-09-28T01:01:50Z
host:            ip-172-31-2-164.us-east-2.compute.internal
instance_type:   c7i.8xlarge
kernel:          6.12.103-129.197.amzn2023.x86_64
cpu_model:       Intel(R) Xeon(R) Platinum 8488C
cpus:            32
sockets/numa:    1 1 
mem_total_gib:   61.8
hugepages:       HugePages_Total:=0 HugePages_Free:=0 Hugepagesize:=2048 
thp:             always [madvise] never
governor:        n/a
numa_balancing:  0
overcommit:      0
pg_numactl:      numactl --interleave=all (postmaster)
storage:
  NAME           SIZE TYPE MODEL                      MOUNTPOINT
  nvme0n1        150G disk Amazon Elastic Block Store 
  ├─nvme0n1p1    150G part                            /
  ├─nvme0n1p127    1M part                            
  └─nvme0n1p128   10M part                            /boot/efi
mdstat:
  Personalities : 
  unused devices: <none>
data_fs:         /dev/nvme0n1p1 xfs   150G   47G  104G  31% /
mentat_git:      final
rustc:           rustc 1.90.0 (1159e78c4 2025-09-14)
python:          Python 3.11.16
duckdb:          1.5.5
sqlite(host py): 3.40.0
postgres:        postgres (PostgreSQL) 16.15
pg_configure:     '--prefix=/home/ec2-user/pg16rel' '--with-icu' 'CFLAGS=-O2 -g'

postgresql.conf (non-default settings):
  DateStyle = ISO, MDY
  TimeZone = UTC
  application_name = psql
  autovacuum_max_workers = 6
  autovacuum_vacuum_cost_limit = 4000
  checkpoint_completion_target = 0.9
  checkpoint_timeout = 30min
  client_min_messages = warning
  default_text_search_config = pg_catalog.english
  dynamic_shared_memory_type = posix
  effective_cache_size = 48GB
  effective_io_concurrency = 256
  lc_messages = C
  lc_monetary = C
  lc_numeric = C
  lc_time = C
  listen_addresses = 
  log_timezone = UTC
  maintenance_work_mem = 4GB
  max_connections = 200
  max_parallel_maintenance_workers = 8
  max_parallel_workers = 32
  max_parallel_workers_per_gather = 4
  max_wal_size = 50GB
  max_worker_processes = 64
  min_wal_size = 4GB
  port = 5432
  random_page_cost = 1.1
  shared_buffers = 16GB
  shared_preload_libraries = pg_stat_statements
  track_io_timing = on
  unix_socket_directories = /tmp
  wal_buffers = 256MB
  work_mem = 64MB

invocation 2026-09-28T01:01:51Z: PHASE=bench SCALES='s m' BACKENDS='pg' cpu_affinity=0-31
  SCENARIOS='point_lookup ref_traversal aggregate predicate_scan pull as_of since input_bindings' EXTRA='concurrency_sweep' CLIENTS='1 8 32' REPS=3 MIN_S=10 MIN_N=30 MAX_S=60
  PROBE_S=20 MIXED_S=60 MIXED_READERS=8 SUSTAINED_S=0 SUSTAINED_CLIENTS=32
  LOAD_MAX_S=5400 EXT_LOAD_MAX_S=5400 PG_LOAD_JOBS=32 EXT_SCENARIO_FILTER=''
  warmup=3 calls (discarded) seed=20260509