[Swift-devel] IO for reading restart log?

[Michael Wilde]

Mihael,

What read() sizes are used to read in the restart log?

I'm watching a restart on beagle now of a restart log in which about 200K apps had completed.

Its going rather slow, and top says that the swift jvm is only using about 10% of one core.  Im wondering if the read() length is very low, which is possibly slowing down the restart when the filesystem on which the .rlog file resides is very congested?

If so, would a bigger read() buffer size help?

We can try looking at whats happening with strace, but the restart process looks to me to be IO bound.

Does the restart process involve also *writing* to the same *or a new) restart log?

Thanks,

- Mike


-- 
Michael Wilde
Computation Institute, University of Chicago
Mathematics and Computer Science Division
Argonne National Laboratory