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### size of csv file: 689.4MB (7,009,728 rows * 29 columns) ###
system.time(read.csv('../data/2008.csv', header = T))
# user system elapsed
# 88.301 2.416 90.716
library(data.table)
system.time(fread('../data/2008.csv', header = T, sep = ','))
# user system elapsed
# 4.740 0.048 4.785
library(bigmemory)
system.time(read.big.matrix('../data/2008.csv', header = T))
# user system elapsed
# 59.544 0.764 60.308
library(ff)
system.time(read.csv.ffdf(file = '../data/2008.csv', header = T))
# user system elapsed
# 60.028 1.280 61.335
library(sqldf)
system.time(read.csv.sql('../data/2008.csv'))
# user system elapsed
# 87.461 3.880 91.447
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