=?ISO-8859-2?Q?Tomasz_K=B3oczko?= writes:
> On Tue, 12 Jul 2005, Tom Zanussi wrote:
[...]
> >
> > Most of the time the data is just being buffered and only when the
> > buffer is full is it written to disk, as one write. If that's too
> > disruptive, then maybe you do need to do some aggregation in the kernel,
> > but it sounds like a special case.
>
> OK .. "so you can say better is stop flushing buffers on measure which
> wil take day or more" ? :_)
> Some DTrace probes/technik are specialy prepared for long or evel very
> long time experiment wich will only prodyce few lines results on end of
> experiment.
> Look at DTrace documentation for speculative tracing:
> http://docs.sun.com/app/docs/doc/817-6223/6mlkidli7?a=view
>
It's also possible to do long-running 'experiments' using relayfs, and
never write anything at all to disk. Here's an example prototype I
did using a Perl interpreter embedded in the user space event-reading
loop:
http://www.listserv.shafik.org/pipermail/ltt-dev/2004-August/000649.html
> Some experiments do not have deterinistic time and must be finished after
> i. e. "occasional failing". What if it will take so long so you will fill
> all avalaible storage in relayfs way ?
> OK, never mind .. you have discontinued storage. Using kind speculative
> tracing way I'll have result *just after* "occasional failing" and you
> will start parse data stored using relayfs.
As in the example above, you don't necessary need to fill any
available storage. You can also use relayfs in 'circular-buffer'
mode, which would capture a buffer full of events up the point of your
failure. Sounds like speculative tracing to me.
Tom
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