[Cdash] How to handle huge test output

Julien Jomier julien.jomier at kitware.com
Thu Dec 10 13:45:47 UTC 2009

Hi Martin,

This is an interesting point and, as you said, we have two options:

1) Provide a way to store the body of the tests outside the database on 
disk. We would have to create a a directory structure to avoid writing 
all the files in the same place.

2) Compress the data in the database. I assume you are using MySQL (and 
MyISAM as your storage engine). One temporary option is to use InnoDB 
which allows for compression of the entire row. PostGreSQL already 
compresses the rows so we should be OK for this one.

I think we should try option 2) first and see how this goes, since 
option 1) is a little bit more complex to implement. Could you log a 
feature request in the bug tracker?


Martin Apel wrote:
> Hi all,
> we currently run lots of tests using CTest/CDash every night (about
> 4000), which produce a huge amount of output. For reasons difficult to
> explain here, we'd like to keep the output, even if the tests succeeded.
> For this reason our database has grown a lot recently, so I am looking
> for ways how to handle this. I thought about two ways:
> 1. Is it possible to embed links into the test output, so we could store
> the test output in separate files, and simply link to these files in
> CDash? We have tried outputting links in the tests,
>     but ctest seems to replace any special characters such as ampersand,
> so we did not succeed until now.
> 2. Is it possible to store the test output inside the database in a
> compressed way? As it is ASCII output, it would probably save a lot of
> disk space.
> Any comments are welcome.
> Best Regards,
> Martin
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