On Tue, Jun 21, 2011 at 11:56 PM, Eric Schwarz
> When using 'massif' it is recommended for short programs to use
> '--time-unit=B' option since o/w no or hardly any output is shown using
> ms_print for visualisation [1]. My question is now regarding the units of
> the x-axis. As far as I have understood represents the unit the cumulated
> number of bytes allocated and freed when option '--time-unit=B' is used.
> Snapshots are taken for allocations and de-allocations, but also in-between
> of them. Since the value of the y-axis (Each vertical bar represents a
> snapshot, i.e. a measurement of the memory usage at a certain point in time.
> [1]) and the value of the x-axis, which represents the cumulated number of
> bytes allocated and freed, have a dependency to each other, how is it
> possible that a parallel line to the x-axis is drawn in the graph [1] since
> actually only a change in the heap usage should generate a forward move on
> the x-axis.
>
I guess you're talking about this graph:
19.63^ ###
| #
| # ::
| # : :::
| :::::::::# : : ::
| : # : : : ::
| : # : : : : :::
| : # : : : : : ::
| ::::::::::: # : : : : : : :::
| : : # : : : : : : : ::
| ::::: : # : : : : : : : : ::
| @@@: : : # : : : : : : : : : @
| ::@ : : : # : : : : : : : : : @
| :::: @ : : : # : : : : : : : : : @
| ::: : @ : : : # : : : : : : : : : @
| ::: : : @ : : : # : : : : : : : : : @
| :::: : : : @ : : : # : : : : : : : : : @
| ::: : : : : @ : : : # : : : : : : : : : @
| :::: : : : : : @ : : : # : : : : : : : : : @
| ::: : : : : : : @ : : : # : : : : : : : : : @
0 +----------------------------------------------------------------------->KB
^^^^^^^^^
And the horizontal lines, eg. where I've added "^^^" marks below the x-axis?
Those horizontal lines make sense with --time-unit=ms and --time-unit=i.
But you're right that they don't make sense with --time-unit=B. Really,
they should angle up or down.
I'm not inclined to fix it thought; --time-unit=B is really only there to
facilitate regression testing, as it gives more deterministic graphs than
--time-unit=ms or --time-unit=i.
I hope this answers your question!
Nick
Nick
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