-------------------------------------------------
using makefile.linux for test, libzlog compile in O2
-------------------------------------------------
[direct write, no logging library] - The Sky!
$ time ./test_press_write 1 10 100000
real	0m1.872s
user	0m0.140s
sys	0m3.290s

$ time ./test_press_write2 1 10 100000
real	0m0.909s
user	0m0.080s
sys	0m1.710s
-------------------------------------------------
v1.1.1 (fwrite is not atomic, so backup to write)
$ time ./test_press_zlog 1 10 100000
real	0m2.334s
user	0m1.780s
sys	0m2.710s

$ time ./test_press_zlog2 1 10 100000
real	0m2.134s
user	0m1.840s
sys	0m1.990s
-------------------------------------------------
v1.1.0
$ time ./test_press_zlog 1 10 100000
real	0m1.107s
user	0m1.500s
sys	0m0.340s

$ time ./test_press_zlog2 1 10 100000
real	0m0.898s
user	0m1.480s
sys	0m0.150s
-------------------------------------------------
v1.0.7
$ time ./test_press_zlog 1 10 100000
real	0m1.783s
user	0m3.000s
sys	0m0.300s

$ time ./test_press_zlog2 1 10 100000
real	0m1.621s
user	0m2.980s
sys	0m0.120s
-------------------------------------------------
v1.0.6
$ time ./test_press_zlog 1 10 100000
real	0m1.814s
user	0m3.060s
sys	0m0.270s

$ time ./test_press_zlog2 1 10 100000
real	0m1.605s
user	0m2.990s
sys	0m0.140s
-------------------------------------------------
v1.0.5
$ time ./test_press_zlog 1 10 100000
real	0m2.779s
user	0m4.170s
sys	0m0.560s

$ time ./test_press_zlog2 1 10 100000
real	0m2.713s
user	0m4.410s
sys	0m0.900s
-------------------------------------------------
v1.0.3
$ time ./test_press_zlog 1 10 100000

real	0m6.349s
user	0m6.300s
sys	0m5.950s

$ time ./test_press_zlog2 1 10 100000
real	0m6.377s
user	0m6.240s
sys	0m6.090s
-------------------------------------------------
v1.0.0
$ time ./test_press_zlog 1 10 100000
real	0m6.364s
user	0m6.040s
sys	0m6.270s

$ time ./test_press_zlog2 1 10 100000
real	0m6.361s
user	0m6.150s
sys	0m6.020s
-------------------------------------------------