cant reproduce buildbot's memory profiling, random fix attempt
cant reproduce buildbot's memory profiling, random fix attempt

dstufft/sqlalchemy,Cito/sqlalchemy,graingert/sqlalchemy,inspirehep/sqlalchemy,Cito/sqlalchemy,epa/sqlalchemy,ThiefMaster/sqlalchemy,Akrog/sqlalchemy,alex/sqlalchemy,robin900/sqlalchemy,EvaSDK/sqlalchemy,bootandy/sqlalchemy,WinterNis/sqlalchemy,hsum/sqlalchemy,wujuguang/sqlalchemy,WinterNis/sqlalchemy,brianv0/sqlalchemy,bootandy/sqlalchemy,Akrog/sqlalchemy,itkovian/sqlalchemy,alex/sqlalchemy,elelianghh/sqlalchemy,sandan/sqlalchemy,robin900/sqlalchemy,epa/sqlalchemy,bdupharm/sqlalchemy,davidjb/sqlalchemy,elelianghh/sqlalchemy,j5int/sqlalchemy,itkovian/sqlalchemy,wujuguang/sqlalchemy,zzzeek/sqlalchemy,bdupharm/sqlalchemy,monetate/sqlalchemy,olemis/sqlalchemy,Cito/sqlalchemy,j5int/sqlalchemy,sandan/sqlalchemy,alex/sqlalchemy,inspirehep/sqlalchemy,EvaSDK/sqlalchemy,olemis/sqlalchemy,halfcrazy/sqlalchemy,davidjb/sqlalchemy,monetate/sqlalchemy,276361270/sqlalchemy,pdufour/sqlalchemy,halfcrazy/sqlalchemy,pdufour/sqlalchemy,brianv0/sqlalchemy,sqlalchemy/sqlalchemy,ThiefMaster/sqlalchemy,dstufft/sqlalchemy,276361270/sqlalchemy,hsum/sqlalchemy,graingert/sqlalchemy,davidfraser/sqlalchemy,davidfraser/sqlalchemy,wfxiang08/sqlalchemy,wfxiang08/sqlalchemy