Analyze hit rate for ARC workloads. Slight edge for OLTP, not better than LRU for Database and Search as cache size increases.

OLTP

Tested 914145 keys in 00:00:07.4416965
Size 250 Classic HitRate 16.47% Concurrent HitRate 15.31%
Size 500 Classic HitRate 23.45% Concurrent HitRate 26.88%
Size 750 Classic HitRate 28.28% Concurrent HitRate 32.04%
Size 1000 Classic HitRate 32.83% Concurrent HitRate 35.36%
Size 1250 Classic HitRate 36.21% Concurrent HitRate 37.97%
Size 1500 Classic HitRate 38.70% Concurrent HitRate 40.06%
Size 1750 Classic HitRate 40.79% Concurrent HitRate 41.88%
Size 2000 Classic HitRate 42.47% Concurrent HitRate 43.49%

Database

Tested 43704979 keys in 00:14:02.7199790
Size 1000000 Classic HitRate 3.09% Concurrent HitRate 4.22%
Size 2000000 Classic HitRate 10.74% Concurrent HitRate 4.66%
Size 3000000 Classic HitRate 18.59% Concurrent HitRate 5.79%
Size 4000000 Classic HitRate 20.24% Concurrent HitRate 6.00%
Size 5000000 Classic HitRate 21.03% Concurrent HitRate 8.59%
Size 6000000 Classic HitRate 33.95% Concurrent HitRate 11.92%
Size 7000000 Classic HitRate 38.90% Concurrent HitRate 12.52%
Size 8000000 Classic HitRate 43.03% Concurrent HitRate 28.41%

Search

Tested 16407702 keys in 00:09:00.0950655
Size 100000 Classic HitRate 2.33% Concurrent HitRate 5.08%
Size 200000 Classic HitRate 4.63% Concurrent HitRate 9.40%
Size 300000 Classic HitRate 7.59% Concurrent HitRate 12.75%
Size 400000 Classic HitRate 12.04% Concurrent HitRate 15.62%
Size 500000 Classic HitRate 22.77% Concurrent HitRate 18.07%
Size 600000 Classic HitRate 34.63% Concurrent HitRate 20.18%
Size 700000 Classic HitRate 46.04% Concurrent HitRate 21.96%
Size 800000 Classic HitRate 56.60% Concurrent HitRate 23.60%