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"machine_name": "MacBook Pro", "machine_model": "Mac15,10", "chip_type": "Apple M3 Max", "number_processors": "proc 14:10:4:0", "physical_memory": "36 GB" }, "memory_bytes": 38654705664, "macos_version": "26.5.2", "macos_build": "25F84", "docker_engine": "29.7.2", "docker_kernel": "7.0.12-linuxkit", "docker_arch": "aarch64", "docker_cpus": 14, "docker_memory_bytes": 8214323200, "other_running_containers": 10, "container_image_id": "sha256:ff63e845e6000f92eb1e8f613884743ca29806dcdf0ad93526e7eb8a9cf56fa8", "container_limits": { "NanoCpus": 0, "Memory": 0, "CpusetCpus": "", "ShmSize": 268435456, "Tmpfs": { "/var/lib/postgresql/data": "" } }, "go": "go version go1.27.1 darwin/arm64", "extension_ref": "67e57549c98726395e299b48f6092191a8153903", "notes": [ "Client and Linux VM share the Mac CPU. Other development containers remained running.", "PostgreSQL data and WAL are on tmpfs. Container memory includes shared memory and cached files; it is not summed process RSS." ], "go_binary_sha256": "5a5f64c52f4c88560b81782c091bb3b1cb1c72ac43c0e778722131e3a72d2f16" }, "go_driver": "github.com/jackc/pgx/v5 v5.11.0", "application_run": { "schema": 1, "measured_at": "2026-09-14T08:16:09.554Z", "extension_ref": "67e57549c98726395e299b48f6092191a8153903", "harness_ref": "55b72e17690336b83c96aaf768b72bef76fdd7b9", "environment": { "database": "pglc_demo", "marker": "pg_local_cache disposable demo", "direct_marker": "pg_local_cache disposable demo", "extension_version": "2.0.2", "postgres_version": "16.15 (Debian 16.15-1.pgdg12+2)", "shared_buffers": "128MB", "cache_entries": "1024", "memory_budget_mb": "384MB", "health": { "ready": true, "max_clients": 0, "resp_enabled": false, "active_clients": 0, "workers_running": 0, "workers_configured": 0, "memory_budget_bytes": 402653184, "estimated_memory_bytes": 10005056, "workers_with_incomplete_mappings": 0, 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"memory_peak_bytes": 436113408, "anon_peak_bytes": 133554176, "shmem_peak_bytes": 273301504, "file_peak_bytes": 273309696, "memory_limit_bytes": null, "io_read_bytes": 0, "io_write_bytes": 0, "network_rx_bytes": 6513381, "network_tx_bytes": 4800780, "throttled_seconds": 0, "memory_events": { "low": 0, "high": 0, "max": 0, "oom": 0, "oom_kill": 0, "oom_group_kill": 0, "sock_throttled": 0 }, "samples": [ { "at_ms": 0, "cpu_seconds": 1829.015637, "throttled_seconds": 0, "cpu_capacity": 14, "memory_bytes": 418201600, "anon_bytes": 133509120, "shmem_bytes": 255950848, "file_bytes": 255959040, "memory_limit_bytes": null, "memory_events": { "low": 0, "high": 0, "max": 0, "oom": 0, "oom_kill": 0, "oom_group_kill": 0, "sock_throttled": 0 }, "rbytes": 0, "wbytes": 8192, "rios": 0, "wios": 2, "rx_bytes": 5186231869, "tx_bytes": 66450139522, "activity": [ { "state": "idle", "wait_event_type": "Client", "count": 64 } ] }, { "at_ms": 550.4798750000045, "cpu_seconds": 1831.000461, "throttled_seconds": 0, "cpu_capacity": 14, "memory_bytes": 431853568, "anon_bytes": 129605632, "shmem_bytes": 273186816, "file_bytes": 273195008, "memory_limit_bytes": null, "memory_events": { "low": 0, "high": 0, "max": 0, "oom": 0, "oom_kill": 0, "oom_group_kill": 0, "sock_throttled": 0 }, "rbytes": 0, "wbytes": 8192, "rios": 0, "wios": 2, "rx_bytes": 5189554789, "tx_bytes": 66452587168, "activity": [ { "state": "active", "wait_event_type": "Client", "count": 3 }, { "state": "active", "wait_event_type": null, "count": 1 }, { "state": "idle", "wait_event_type": "Client", "count": 56 }, { "state": "idle", "wait_event_type": "LWLock", "count": 1 }, { "state": "idle", "wait_event_type": null, "count": 3 } ] }, { "at_ms": 1052.3515000000043, "cpu_seconds": 1832.852258, "throttled_seconds": 0, "cpu_capacity": 14, "memory_bytes": 435560448, "anon_bytes": 133185536, "shmem_bytes": 273301504, "file_bytes": 273309696, "memory_limit_bytes": null, "memory_events": { "low": 0, "high": 0, "max": 0, "oom": 0, "oom_kill": 0, "oom_group_kill": 0, "sock_throttled": 0 }, "rbytes": 0, "wbytes": 8192, "rios": 0, "wios": 2, "rx_bytes": 5192544319, "tx_bytes": 66454789184, "activity": [ { "state": "active", "wait_event_type": null, "count": 2 }, { "state": "idle", "wait_event_type": "Client", "count": 58 }, { "state": "idle", "wait_event_type": null, "count": 4 } ] }, { "at_ms": 1118.0561250000028, "cpu_seconds": 1832.999926, "throttled_seconds": 0, "cpu_capacity": 14, "memory_bytes": 436113408, "anon_bytes": 133554176, "shmem_bytes": 273301504, "file_bytes": 273309696, "memory_limit_bytes": null, "memory_events": { "low": 0, "high": 0, "max": 0, "oom": 0, "oom_kill": 0, "oom_group_kill": 0, "sock_throttled": 0 }, "rbytes": 0, "wbytes": 8192, "rios": 0, "wios": 2, "rx_bytes": 5192745250, "tx_bytes": 66454940302, "activity": [ { "state": "idle", "wait_event_type": "Client", "count": 64 } ] } ] } } ] }, "measurement_notes": [ "Each client variant runs in a separate process, sequentially. No pgbench is used in this comparison.", "Node JSON wraps the same mget call in array_to_json; Go pgx uses binary text[] decoding. All variants parse each row JSON and restore requested positions.", "CPU is cgroup usage across an initial/final snapshot window around the timed workload. It includes sampler processes and background PostgreSQL work.", "Memory is sampled every 500ms plus endpoints; peaks are sampled peaks, not RSS or an exact maximum. memory.current includes shared memory, tmpfs and page cache.", "Raw activity snapshots distinguish PostgreSQL state from wait_event_type; active includes clients waiting on ClientRead/ClientWrite.", "Client and server share Mac hardware with other development containers. tmpfs does not represent durable disk I/O.", "threads records execution parallelism: Node one event loop; Go GOMAXPROCS, not live OS thread count." ], "query_plans": [ { "batch": 1, "mode": "postgres-any", "plan": { "Plan": { "Node Type": "Index Scan", "Parallel Aware": false, "Async Capable": false, "Scan Direction": "Forward", "Index Name": "items_pkey", "Relation Name": "items", "Alias": "i", "Startup Cost": 0.28, "Total Cost": 8.31, "Plan Rows": 1, "Plan Width": 64, "Actual Startup Time": 0.005, "Actual Total Time": 0.005, "Actual Rows": 1, "Actual Loops": 1, "Index Cond": "(id = ANY ('{1}'::bigint[]))", "Rows Removed by Index Recheck": 0, "Shared Hit Blocks": 3, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning": { "Shared Hit Blocks": 0, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning Time": 0.014, "Triggers": [], "Execution Time": 0.009 } }, { "batch": 1, "mode": "mget-json", "plan": { "Plan": { "Node Type": "Result", "Parallel Aware": false, "Async Capable": false, "Startup Cost": 0, "Total Cost": 0.01, "Plan Rows": 1, "Plan Width": 32, "Actual Startup Time": 0.023, "Actual Total Time": 0.023, "Actual Rows": 1, "Actual Loops": 1, "Shared Hit Blocks": 21, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning": { "Shared Hit Blocks": 0, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning Time": 0.003, "Triggers": [], "Execution Time": 0.025 } }, { "batch": 1, "mode": "mget-text", "plan": { "Plan": { "Node Type": "Result", "Parallel Aware": false, "Async Capable": false, "Startup Cost": 0, "Total Cost": 0.01, "Plan Rows": 1, "Plan Width": 32, "Actual Startup Time": 0.025, "Actual Total Time": 0.025, "Actual Rows": 1, "Actual Loops": 1, "Shared Hit Blocks": 21, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning": { "Shared Hit Blocks": 0, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning Time": 0.003, "Triggers": [], "Execution Time": 0.027 } }, { "batch": 64, "mode": "postgres-any", "plan": { "Plan": { "Node Type": "Index Scan", "Parallel Aware": false, "Async Capable": false, "Scan Direction": "Forward", "Index Name": "items_pkey", "Relation Name": "items", "Alias": "i", "Startup Cost": 0.28, "Total Cost": 48.95, "Plan Rows": 10, "Plan Width": 64, "Actual Startup Time": 0.006, "Actual Total Time": 0.066, "Actual Rows": 64, "Actual Loops": 1, "Index Cond": "(id = ANY ($1))", "Rows Removed by Index Recheck": 0, "Shared Hit Blocks": 183, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning": { "Shared Hit Blocks": 0, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning Time": 0.005, "Triggers": [], "Execution Time": 0.072 } }, { "batch": 64, "mode": "mget-json", "plan": { "Plan": { "Node Type": "Result", "Parallel Aware": false, "Async Capable": false, "Startup Cost": 0, "Total Cost": 0.01, "Plan Rows": 1, "Plan Width": 32, "Actual Startup Time": 0.057, "Actual Total Time": 0.057, "Actual Rows": 1, "Actual Loops": 1, "Shared Hit Blocks": 21, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning": { "Shared Hit Blocks": 0, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning Time": 0.003, "Triggers": [], "Execution Time": 0.059 } }, { "batch": 64, "mode": "mget-text", "plan": { "Plan": { "Node Type": "Result", "Parallel Aware": false, "Async Capable": false, "Startup Cost": 0, "Total Cost": 0.01, "Plan Rows": 1, "Plan Width": 32, "Actual Startup Time": 0.044, "Actual Total Time": 0.044, "Actual Rows": 1, "Actual Loops": 1, "Shared Hit Blocks": 21, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning": { "Shared Hit Blocks": 0, "Shared Read Blocks": 0, "Shared Dirtied Blocks": 0, "Shared Written Blocks": 0, "Local Hit Blocks": 0, "Local Read Blocks": 0, "Local Dirtied Blocks": 0, "Local Written Blocks": 0, "Temp Read Blocks": 0, "Temp Written Blocks": 0 }, "Planning Time": 0.005, "Triggers": [], "Execution Time": 0.047 } } ] }