Cost Engineering: 4090 Lokal mi Cloud H100 mu? — Breakeven, Spot ve TCO Matematiği

# === TCO Calculator — cookbook'un ders sonu çıktısı ===
class TCOCalculator:
    def __init__(self):
        # Lokal RTX 4090 rig (TR fiyatlar, 2026)
        self.local_rig_cost_tl = 141_000
        self.local_amort_years = 3
        self.local_electricity_per_kwh_tl = 3.50
        self.local_power_watts = 500     # FT load
        self.tl_per_usd = 33.0
 
        # Cloud fiyatları $/saat
        self.cloud_prices = {
            "runpod_4090_community": 0.50,
            "runpod_4090_secure": 0.99,
            "lambda_a100_80gb": 1.79,
            "lambda_h100_sxm": 2.99,
            "lambda_8h100_sxm": 23.92,
            "coreweave_8h100_sxm": 24.32,
        }
 
    def local_cost_per_hour_tl(self):
        amort = self.local_rig_cost_tl / (self.local_amort_years * 365 * 8)  # 8 saat/gün varsayım
        electricity = self.local_power_watts / 1000 * self.local_electricity_per_kwh_tl
        return amort + electricity
 
    def cloud_cost_per_hour_tl(self, sku):
        return self.cloud_prices[sku] * self.tl_per_usd
 
    def breakeven_hours(self, sku):
        """Lokal rig'in cloud kullanmaktan ucuz olmaya başladığı kümülatif saat."""
        cloud_hourly_tl = self.cloud_cost_per_hour_tl(sku)
        electricity_hourly_tl = self.local_power_watts / 1000 * self.local_electricity_per_kwh_tl
        # Rig amortismanını saatlik cloud farkıyla geri kazanma
        if cloud_hourly_tl <= electricity_hourly_tl:
            return None  # cloud her zaman ucuz
        return self.local_rig_cost_tl / (cloud_hourly_tl - electricity_hourly_tl)
 
# Kullanım
calc = TCOCalculator()
print(f"Lokal 4090 TCO/saat: ₺{calc.local_cost_per_hour_tl():.2f}")
for sku in ["runpod_4090_community", "lambda_a100_80gb", "lambda_h100_sxm"]:
    breakeven = calc.breakeven_hours(sku)
    print(f"{sku}: ₺{calc.cloud_cost_per_hour_tl(sku):.0f}/saat  breakeven={breakeven:.0f} saat" if breakeven else f"{sku}: hep ucuz")
 
# Tipik çıktı (TR perspektifi):
# Lokal 4090 TCO/saat: ₺17.86
# runpod_4090_community: ₺17/saat  breakeven=22000 saat (10 yıl)
# lambda_a100_80gb:       ₺59/saat  breakeven=2500 saat (1 yıl)
# lambda_h100_sxm:        ₺99/saat  breakeven=1500 saat (8 ay)