I am sorry, just now I have found TMapFile in pyROOT where the error message should have got removed… I am trying - because I am on Ubuntu …
Not really a change with LD_PRELOAD=$ROOTSYS/lib/libNew.so; python3 mytest.py however, TMapFile object appears…
from ROOT import TFile, TH1F, TH1D, TMapFile
f = TMapFile.Create( mmapfile );
print(f)
mr=f.GetFirst()
print(mr)
print(mr.GetNext() )
and the corresponding errror is similar
Error in <TMapFile::TMapFile>: no memory mapped file capability available
Use rootn.exe or link application against "-lNew"
<ROOT.TMapFile object ("mmap.histo") at 0x2d22530>
<ROOT.TMapRec object at 0x(nil)>