맥 사이의 선들

#!/usr/bin/env python3
"""Wires between Macs: every link the household uses, its vendor bandwidth, and how long
a 16 GB checkpoint takes to cross it. Vendor figures; the measured RDMA figure is a
public one (Geerling) and labelled so."""
links = [  # name, GB/s, source
    ("UltraFusion, M3 Ultra (inside one package)",  2500, "Apple: 'over 2.5TB/s' -- not a wire between Macs; the scale bar"),
    ("Thunderbolt 5 (the cabled pair; office <-> server)", 10, "Apple/Intel: 80 Gb/s bidirectional; 120 Gb/s 'Bandwidth Boost' for displays"),
    ("Thunderbolt 5, RDMA measured by a third party",   6.9, "Geerling 2025-12-18: 'something like 50-60 Gbps' -> ~6.9 GB/s at 55 Gb/s"),
    ("10 Gigabit Ethernet",                             1.25, "IEEE 802.3an: 10 Gb/s"),
    ("Wi-Fi 6E / 7, typical",                            0.15, "order of magnitude; varies"),
    ("the tailnet over the internet (a remote Mac)",   0.05, "order of magnitude; the household's WAN"),
    ("Apple's own scale bar: PCIe 5 x16",                63, "63 GB/s per direction (T2)"),
]
MODEL = 16.05  # GB, the 27B checkpoint on disk
print(f"{'link':56} {'GB/s':>7} {'16 GB model':>12}")
for name, gbs, src in links:
    print(f"{name:56} {gbs:7.2f} {MODEL/gbs:10.1f} s")
print("\nthe fastest wire between two Macs is 250x slower than the fabric inside one; the big-models track prices what that means for pooling")

# link                                                        GB/s  16 GB model
# UltraFusion, M3 Ultra (inside one package)               2500.00        0.0 s
# Thunderbolt 5 (the cabled pair; office <-> server)         10.00        1.6 s
# Thunderbolt 5, RDMA measured by a third party               6.90        2.3 s
# 10 Gigabit Ethernet                                         1.25       12.8 s
# Wi-Fi 6E / 7, typical                                       0.15      107.0 s
# the tailnet over the internet (a remote Mac)                0.05      321.0 s
# Apple's own scale bar: PCIe 5 x16                          63.00        0.3 s