[Halld-offline] scons install (in sim-recon) takes forever

[Nathan Sparks]

Hi Richard,

Here are some quick tests using sim-recon commit a5474aa on my (non-Farm) RHEL 7 machine, with a very light load:
1. If I build with debug symbols off (8.5 min. w/ 8 threads) and then run “scons -j8 install DEBUG=0” in the src directory,
it takes ~ 15 s for scons to report back that the “install” is up to date.

2. If I rebuild with debug symbols on (19 min. w/ 8 threads) and then run “scons -j8 install” in the src directory,
it takes ~ 1.5 min. to output that the installation is up to date.

I having been doing my builds with DEBUG=0 for a long time now, so I am used to the quicker builds/checks.

Maybe the longer time it takes to check a debug build in combination with a heavy system load can explain your observation.

-Nathan

> On Mar 23, 2017, at 7:23 AM, Richard Jones <richard.t.jones at uconn.edu> wrote:
> 
> Hello all,
> 
> Did someone check in a change that might have caused this? A few weeks back, if I did "scons install" in sim-recon and there was nothing to do (no updates since last build) it would return with success and report up-to-date within less than 1 minute. Now it takes forever (I hit ctrl-C after 20 minutes) to discover that it has nothing to do. 
> 
> -Richard J.
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