> > Hello Hatayama-san,
> >
> > Thank you for your work.
> >
> >> Performance Comparison:
> >>
> >> Sample Data
> >>
> >> Ideally, I must have measured the performance for many enough
> >> vmcores generated from machines that was actually running, but now
> >> I don't have enough sample vmcores, I couldn't do so. So this
> >> comparison doesn't answer question on I/O time improvement. This
> >> is TODO for now.
> >
> > I'll measure the performance for actual vmcores by makedumpfile.
> > Please wait for a while.
I measured the performance of makedumpfile for some vmcores.
Please see below.
Sample Data
To simulate a working server, I captured VMCOREs while almost all pages
were alloceted and filled with random data. (See attached file "fill_random.c")
I captured the VMCOREs of 5GB, 7.5GB and 10GB in the same condition.
How to measure
I measured the total execution time and the size of output file.
$ time makedumpfile --message-level 16 [-c|-l| ] vmcore dumpfile
Result
See attached file "result.txt".
This time, lzo's compression was the quickest, and lzo's compression ratio is
almost the same(only a bit worse) as zlib's.
It seems good, and I will merge the patch set into the makedumpfile.
What is your opinion, Dave?
Thanks.
KUMAGAI, Atsushi
>
> That's very helpful. Thanks in advance.
>
> But of course I'm also still looking for alternative way.
>
> Thanks.
> HATAYAMA, Daisuke
>
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