De repente, mi iMac (a finales de 2013) comenzó a acelerar la CPU a 0,80 GHz, todo se vuelve súper lento. Ocurre ~ 5-10 minutos después de un reinicio nuevo, a veces vuelve a la velocidad máxima durante períodos cortos, pero la mayoría del tiempo permanece estrangulado. Intenté restablecer SMC, no parece ayudar. También hice instalación limpia de Sierra, tampoco ayudó ...
powermetrics informa que la aceleración se produce debido a "GPU LIMIT PROCHOT", aunque la temperatura es normal en todos los sensores en los que podría echar un vistazo.
$ sudo thermal levels
cpu: 180
gpu: 30
io: 30
$ sudo powermetrics
...
**** Processor usage ****
Intel energy model derived package power (CPUs+GT+SA): 2.48W
LLC flushed residency: 65.9%
System Average frequency as fraction of nominal: 27.52% (798.17 Mhz)
Package 0 C-state residency: 67.72% (C2: 9.36% C3: 2.08% C6: 56.28% C7: 0.00% )
Performance Limited Due to:
GPU LIMIT PROCHOT
Core 0 C-state residency: 83.91% (C3: 0.00% C6: 0.00% C7: 83.91% )
CPU 0 duty cycles/s: active/idle [< 16 us: 92.56/27.35] [< 32 us: 14.86/12.29] [< 64 us: 19.82/76.90] [< 128 us: 32.70/49.35] [< 256 us: 49.15/26.76] [< 512 us: 32.90/34.68] [< 1024 us: 27.15/21.80] [< 2048 us: 5.95/33.30] [< 4096 us: 0.40/36.47] [< 8192 us: 0.20/14.67] [< 16384 us: 55.49/0.00] [< 32768 us: 2.18/0.00]
CPU Average frequency as fraction of nominal: 27.52% (798.17 Mhz)
Core 1 C-state residency: 84.27% (C3: 0.00% C6: 0.00% C7: 84.27% )
CPU 1 duty cycles/s: active/idle [< 16 us: 125.26/30.32] [< 32 us: 6.94/8.92] [< 64 us: 16.05/82.65] [< 128 us: 45.19/44.79] [< 256 us: 30.52/32.31] [< 512 us: 34.29/40.83] [< 1024 us: 21.60/22.99] [< 2048 us: 10.11/30.13] [< 4096 us: 5.75/38.05] [< 8192 us: 9.32/22.99] [< 16384 us: 47.96/0.20] [< 32768 us: 1.39/0.00]
CPU Average frequency as fraction of nominal: 27.52% (798.18 Mhz)
Core 2 C-state residency: 82.53% (C3: 0.02% C6: 0.00% C7: 82.50% )
CPU 2 duty cycles/s: active/idle [< 16 us: 130.81/31.91] [< 32 us: 8.32/3.37] [< 64 us: 19.82/104.84] [< 128 us: 41.42/44.00] [< 256 us: 38.65/33.30] [< 512 us: 34.09/46.38] [< 1024 us: 27.95/20.02] [< 2048 us: 13.48/28.94] [< 4096 us: 6.94/41.03] [< 8192 us: 10.11/24.77] [< 16384 us: 46.38/0.20] [< 32768 us: 0.79/0.00]
CPU Average frequency as fraction of nominal: 27.52% (798.17 Mhz)
Core 3 C-state residency: 86.15% (C3: 0.00% C6: 0.00% C7: 86.15% )
CPU 3 duty cycles/s: active/idle [< 16 us: 105.64/27.95] [< 32 us: 5.95/0.99] [< 64 us: 13.28/80.07] [< 128 us: 39.04/35.48] [< 256 us: 29.93/25.57] [< 512 us: 32.31/36.07] [< 1024 us: 20.41/22.40] [< 2048 us: 4.76/26.95] [< 4096 us: 2.38/34.29] [< 8192 us: 2.58/22.59] [< 16384 us: 54.90/0.00] [< 32768 us: 0.79/0.00]
CPU Average frequency as fraction of nominal: 27.52% (798.17 Mhz)
**** SMC sensors ****
CPU Thermal level: 180
GPU Thermal level: 30
IO Thermal level: 30
Fan: 2471 rpm
CPU die temperature: 38.38 C
GPU die temperature: 41.00 C
Revisé todos los sensores y no hay una temperatura de informe superior a 42C. ¿En qué se basan esos niveles térmicos?
Buscando desesperadamente cualquier puntero ... ¡Gracias de antemano!