If wallet loads blocks from bootstrap.dat, should I see something in the debug.log?.. I placed bootstrap.dat into the folder where wallet.dat and all the stuff is, restarted the wallet, but I don't see "bootstrap.dat " anywhere in the debug.log. Thus I am unsure if wallet found the file. What output should I see in debug.log, when bootstrap file is found?
No, there will be extra message.
When loading is done client will call
LogPrintf("Loaded %i blocks from external file in %dms\n", nLoaded, GetTimeMillis() - nStart);
however, as you can see it does not contain that external file name (bootstrap.dat in this case).
Also, after loading bootstrap.dat will be renamed to bootstrap.dat to do not reload it every wallet start.
Personally I use
lsof on my linux box to see that 8bitd process is accessing bootstrap.dat file. Browse my older posts to find an example.
I can add code informing that we booted with bootstrap, it's not a big deal.