nvme speed write example (#10230)

extra/usbgpu/legacy/nvme_speed.py

@@ -0,0 +1,23 @@
+import array, time, ctypes, struct, random
+from hexdump import hexdump
+from tinygrad.runtime.support.usb import ASM24Controller, WriteOp, ScsiWriteOp
+from tinygrad.runtime.autogen import pci
+from tinygrad.helpers import Timing
+from tinygrad import Device
+
+usb = ASM24Controller()
+
+def real_scsi_write():
+  self.exec_ops([ScsiWriteOp(buf, lba)])
+
+for i in range(256):
+  xxx = (ctypes.c_uint8 * 4096)()
+  dfg = random.randint(0, 255)
+  for i in range(len(xxx)): xxx[i] = dfg
+  # print(dfg, usb.read(0xf000, 0x10))
+  st = time.perf_counter_ns()
+  usb.scsi_write(bytes(xxx), lba=0x1000 + i)
+  en = time.perf_counter_ns()
+  print("mb/s is ", (0x1000) / (en - st) * 1e9 / 1024 / 1024)
+
+exit(0)