Re: [boost] [flyweight] post-review version available

Subject: Re: [boost] [flyweight] post-review version available
From: Kevin Sopp (baraclese_at_[hidden])
Date: 2008-11-07 17:34:04

I tried to compile the example perf.cpp but I needed to link to the
pthread library under linux. Otherwise I will get errors like:

perf.cpp:(.text._ZN5boost10flyweights6detail27recursive_lightweight_mutexC1Ev[boost::flyweights::detail::recursive_lightweight_mutex::recursive_lightweight_mutex()]+0x1e):
undefined reference to `pthread_mutexattr_init'

Additionally the loop that tests value access time was optimized away
so I had to print the value 's' to cout as a quick fix to this.

Here are a few results on an Athlon XP 2000+, g++-4.3.2. I created a
file that contained the don quichote text four times and used that as
input.

simple string -------------------------
initialization time: 5.33 s
assignment time: 13.81 s
equality comparison time: 0.42 s
value access time: 14.8 s
bytes used: 294747496

flyweight, hashed factory------------
initialization time: 6.39 s
assignment time: 5.81 s
equality comparison time: 0.42 s
value access time: 11.54 s
bytes used: 241724917= flyweights(240691328)+values(1033589)

flyweight, hashed factory, no tracking------------
initialization time: 5.98 s
assignment time: 1.32 s
equality comparison time: 0.43 s
value access time: 11.54 s
bytes used: 241622381= flyweights(240691328)+values(931053)

flyweight, set-based factory--------------------
initialization time: 7.43 s
assignment time: 6.05 s
equality comparison time: 0.43 s
value access time: 13.34 s
bytes used: 241836109= flyweights(240691328)+values(1144781)

flyweight, set-based factory, no tracking---------
initialization time: 7.22 s
assignment time: 1.34 s
equality comparison time: 0.43 s
value access time: 12.17 s
bytes used: 241733573= flyweights(240691328)+values(1042245)