Hello It seems that /usr/bin/time program reports a wrong value for MaxRSS. The report shows MaxRSS, about 4 times the actual allocated memory by a process and its children. MaxRSS (Maximum Resident Set Size) is assumed to be maximum allocated memory by a process and its children. This bug report talks about this problem. More descriptions are provided in time-problem.tar.gz file attached to this mail. Thank you in advance -- Kamran Amini Software Engineer, Software Developer SharifCERT Email : amini.k@cert.sharif.edu GMail : kamran.amini.eng@gmail.com SharifCERT Website : http://cert.sharif.edu 5th Floor, SharifCERT (APA) Department of Computer Engineering Sharif University of Technology Tehran, Iran