Does (Cache) Size Matter, Continued...
30 December 2009
bash-3.2$ ./tst_ar4 -h pr_A1_50_16_64.nc
cs[0] cs[1] cs[2] cache(MB) deflate shuffle read_hor(us) read_time_ser(us)
50 16 64 4 1 0 157932 155803
50 16 64 16 1 0 3473 155237
50 16 64 32 1 0 3479 146510
50 16 64 64 1 0 3487 120306
50 16 64 128 1 0 3499 64149
30 December 2009
Oddly, increasing the cache here seems to hurt:
./tst_ar4 -h pr_A1_256_128_128.nc
cs[0] cs[1] cs[2] cache(MB) deflate shuffle read_hor(us) read_time_ser(us)
256 128 128 4 0 0 218 1611
256 128 128 16 0 0 9352 34872
256 128 128 32 0 0 134 32464
256 128 128 64 0 0 133 32303
256 128 128 128 0 0 146 12202
The best read time for the time series is a 4 MB chunk cache. Why?
