[OpenStack Foundation] openstack swift PUT object question

dboyzhong dboyzhong at 163.com
Fri Oct 10 12:44:13 UTC 2014

   when i put a object(1K) to swift cluster, the performance is so bad, QPS only 16. and i found the function: "_finalize_put" in file Diskfile.py cost too much time .
mainly caused by the fsync() inside _finalize_put operation, the fsync() will cost 30ms when write 1KB data to disk .  as a result the PUT performance is bad.

  how can tuning the performance ? and why call fsync() function?

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