Some cache size tests for netcdf-4 and ar4 data.
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?
