Benchmark: assign odd writes to threads more evenly
Benchmark: assign odd writes to threads more evenly

tempbottle/logcabin,tempbottle/logcabin,nhardt/logcabin,TigerZhang/logcabin,gaoning777/logcabin,nhardt/logcabin,nhardt/logcabin,tempbottle/logcabin,gaoning777/logcabin,logcabin/logcabin,TigerZhang/logcabin,gaoning777/logcabin,dankenigsberg/logcabin,logcabin/logcabin,chaozh/logcabin,chaozh/logcabin,nhardt/logcabin,tempbottle/logcabin,logcabin/logcabin,TigerZhang/logcabin,gaoning777/logcabin,dankenigsberg/logcabin,chaozh/logcabin,chaozh/logcabin,dankenigsberg/logcabin,TigerZhang/logcabin,dankenigsberg/logcabin,logcabin/logcabin