Re: hadd, small target

The difference could be due to a better compression in case of more homogeneous data (as opposed to sparse data). Did you check your result histograms?

Rene Brun

Margar Simonyan wrote:
> Hello
>
> I use hadd to add hsitograms from 2 files to a target file, but
> somehow the resulting target is smaller than the largest source file.
> Is this normal ?
>
> Here is what I do (the target file does not exist before invoking hadd):
>
> hadd Profile90ComponentsMC.root Profile90ComponentsMC.root.back
> Profile90ComponentsMC.lapp.root
>
> ls -l Profile90ComponentsMC.*
> -rw-r--r-- 1 margar margar 45665 2008-05-13 14:36
> Profile90ComponentsMC.lapp.root
> -rw-r--r-- 1 margar margar 2657679 2008-05-13 14:48 Profile90ComponentsMC.root
> -rw-r--r-- 1 margar margar 2707599 2008-05-13 14:37
> Profile90ComponentsMC.root.back
>
> There are large number of histograms within these files and it is
> somewhat difficult to check whether I had lost some histograms or not.
>
> Thanks,
> Margar
>
>
>
>
Received on Tue May 13 2008 - 15:27:58 CEST