Does (Cache) Size Matter?

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?

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