[pypy-dev] the program will make pypy say "Segment fault"

on Ubuntu 64bit, 6G memory, 4Core, python2.7.2 Program: import datetime tmp_str1 = 'aaaaaaaaaa' * 10000 tmp_str2 = 'bbbbbbbbbb' * 10000 tmp_str3 = 'bbbbbbbbbb' * 10000 tmp_str4 = 'bbbbbbbbbb' * 10000 s = datetime.datetime.now() for i in xrange(100000): a = "%s%s%s%s" % (tmp_str1, tmp_str2, tmp_str3, tmp_str4) e = datetime.datetime.now() print str(e-s) s = datetime.datetime.now() for i in xrange(100000): a = tmp_str1 + tmp_str2 + tmp_str3 + tmp_str4 e = datetime.datetime.now() print str(e-s) Ouput: Segment Fault -- *Space Lee*