Last week, after not being able to find a handy and fast cache module, I decided to write one by myself, and the outcome is Cache::LRU.
Cache::LRU is an in-memory cache module written in pure-perl. It has no dependencies, and the code is less than 100 lines long. Yet it is faster than other modules as the result of a primitive benchmark shows (note: Cache::FastMmap is a shared-memory cache and the overhead of inter-process communication needs to be taken into consideration).
$ perl -Ilib benchmark/simple.pl
cache_hit:
Rate Cache::Ref::LRU (List) Cache::FastMmap Cache::Ref::LRU (Array) Cache::FastMmap (raw) Tie::Cache::LRU Cache::LRU
Cache::Ref::LRU (List) 29.1/s -- -14% -31% -37% -72% -80%
Cache::FastMmap 33.9/s 17% -- -20% -27% -68% -77%
Cache::Ref::LRU (Array) 42.3/s 45% 25% -- -9% -60% -71%
Cache::FastMmap (raw) 46.4/s 60% 37% 10% -- -56% -69%
Tie::Cache::LRU 105/s 260% 209% 147% 125% -- -29%
Cache::LRU 148/s 408% 336% 249% 218% 41% --
cache_set:
(warning: too few iterations for a reliable count)
(warning: too few iterations for a reliable count)
(warning: too few iterations for a reliable count)
s/iter Cache::Ref::LRU (List) Tie::Cache::LRU Cache::LRU
Cache::Ref::LRU (List) 3.02 -- -43% -70%
Tie::Cache::LRU 1.71 77% -- -47%
Cache::LRU 0.910 232% 88% --
$ uname -a
Darwin ******** 10.5.0 Darwin Kernel Version 10.5.0: Fri Nov 5 23:20:39 PDT 2010; root:xnu-1504.9.17~1/RELEASE_I386 i386
