[Pvfs2-developers] epoll fun

[Pete Wyckoff]

slang at mcs.anl.gov wrote on Thu, 04 Oct 2007 15:21 -0500:
> I'm in the process of getting a trace and dump from the same server  
> during the same runs.

Good, will be interesting too see tcpdump + strace.  Although I
worry we might not learn anything new.

> In the meantime, I attached two "zoomed" plots of the last one I  
> sent, with ranges set to 5000-5200 secs and 5000-6000 secs,  
> respectively.  I thought they were interesting, both for the behavior  
> that epoll_wait exhibits during operations over the VFS, and just for  
> the patterns they show at a scale of 100s of seconds (it almost looks  
> like a seirpinski triangle).  Not that it sheds much light on the  
> problem.

Pretty.  Maybe there's a category for Most Attractive Unexplained
Distributed System Art in the state fair this year.

Would the pending request ID stuff with slog etc be useful in
tracking individual operations?

		-- Pete