--- /dev/null
+#
+# This example measures the performance of encrypted
+# storage access through a local memory-mapped file.
+#
+
+import os
+import random
+import time
+
+import pyoram
+from pyoram.util.misc import MemorySize
+from pyoram.encrypted_storage.encrypted_block_storage import \
+ EncryptedBlockStorage
+
+import tqdm
+
+pyoram.config.SHOW_PROGRESS_BAR = True
+
+# Set the storage location and size
+storage_name = "heap.bin"
+# 4KB block size
+block_size = 4000
+# one block per bucket in the
+# storage heap of height 8
+block_count = 2**(8+1)-1
+
+def main():
+
+ print("Storage Name: %s" % (storage_name))
+ print("Block Count: %s" % (block_count))
+ print("Block Size: %s" % (MemorySize(block_size)))
+ print("Total Memory: %s"
+ % (MemorySize(block_size*block_count)))
+ print("Actual Storage Required: %s"
+ % (MemorySize(
+ EncryptedBlockStorage.compute_storage_size(
+ block_size,
+ block_count,
+ storage_type='mmap'))))
+ print("")
+
+ print("Setting Up Encrypted Block Storage")
+ setup_start = time.time()
+ with EncryptedBlockStorage.setup(storage_name,
+ block_size,
+ block_count,
+ storage_type='mmap',
+ ignore_existing=True) as f:
+ print("Total Setup Time: %2.f s"
+ % (time.time()-setup_start))
+ print("Total Data Transmission: %s"
+ % (MemorySize(f.bytes_sent + f.bytes_received)))
+ print("")
+
+ # We close the device and reopen it after
+ # setup to reset the bytes sent and bytes
+ # received stats.
+ with EncryptedBlockStorage(storage_name,
+ key=f.key,
+ storage_type='mmap') as f:
+
+ test_count = 1000
+ start_time = time.time()
+ for t in tqdm.tqdm(list(range(test_count)),
+ desc="Running I/O Performance Test"):
+ f.read_block(random.randint(0,f.block_count-1))
+ stop_time = time.time()
+ print("Access Block Avg. Data Transmitted: %s (%.3fx)"
+ % (MemorySize((f.bytes_sent + f.bytes_received)/float(test_count)),
+ (f.bytes_sent + f.bytes_received)/float(test_count)/float(block_size)))
+ print("Access Block Avg. Latency: %.2f ms"
+ % ((stop_time-start_time)/float(test_count)*1000))
+ print("")
+
+ # cleanup because this is a test example
+ os.remove(storage_name)
+
+if __name__ == "__main__":
+ main() # pragma: no cover