Changsheng Jiang wrote:
Hi list,I run pvfs2 on three servers, connect each other with 1G bandwidth lan. A command pvfs2-cp a-1G-file-to-pvfs runs more then 42.2 Seconds, locally copy cp only needs 3.3 Seconds. It's that normal? Changsheng Jiang
I would expect the pvfs2-cp to be at least somewhat faster. 42.2 seconds works out to roughly 25 MB/s, which is low for a client connected via gigabit ethernet.
The local cp works out to 310.3 MB/s, which means that it is taking advantage of the buffer cache rather actually moving data to disk. Even if PVFS were operating perfectly, the best you could hope for from pvfs2-cp would be more like 80 MB/s. PVFS does not do any client side caching of data, so it can't go any faster than your network link.
Your PVFS configuration does seem a little slow, but no matter what you do you aren't going to be able to match the local cp number that you listed.
-Phil _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
