Large files performance

[maariolopezz]

I have recently been testing the reading/writing performance of Riofs and S3FS on an EC2 instance. The results I obtained show that Riofs is able read a 2GB file in 45 seconds on average and write a 2GB file in 97 seconds on average, while S3FS performs the reading in 7 seconds on average and the writing in 23 seconds. I have used the default configuration for both systems.

Any idea why this happens?

This is the test I am running to test writing performance (the rest of the tests are pretty much the same but with different input/output):

import time
import os

for x in range(10):
	os.system('rm -rf /tmp/riofs/*')
	os.system('(echo 3 | sudo tee /proc/sys/vm/drop_caches) > /dev/null')
	os.system('sudo riofs -c ~/.config/riofs/riofs.conf.xml -o direct_io mybucket /storage/riofsS3nc')
	time.sleep(3)

	tinit = time.time()
	os.system('dd if=/dev/zero of=/storage/riofsS3nc/riofs/tesFileLarge bs=1MB count=2000 oflag=nocache iflag=nocache status=none')
	lapse =  time.time() - tinit

	print("riofs: " + str(lapse))

	os.system('fusermount -u /storage/riofsS3nc/')
	time.sleep(2)