Hi, Can anyone tell me how the PVFS2 server-side caching works, especially on small IO? Here's what I observed: I was doing random offset access on a 16MB file stored on PVFS2, each access size is 8KB, and the offset is "random" within the file. Note that it is not pure "random" because each 8KB content in the file is accessed and only accessed once. I cleaned the cache on both the server and client before the tests. While doing this, I captured the packets through the network. And I found out the response time changes from several ms to less than 1 ms as more requests are served. So I want to ask if PVFS2 is doing caching in this case (although I know the disk level, the local file system and the page cache all may do some caching). If so, how does it work or is there any reference? (Note that our testbed has 31GB of cache available.)
Thank you, -- Yonggang Liu Advanced Computing and Information Systems Laboratory University of Florida
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