slackcoder/bitcoin - Bitcoin Code integration/staging tree

Age	Commit message (Collapse)	Author
2018-03-22	Merge #12048: Use best-fit strategy in Arena, now O(log(n)) instead O(n)	Wladimir J. van der Laan
	5fbf7c4 fix nits: variable naming, typos (Martin Ankerl) 1e0ee90 Use best-fit strategy in Arena, now O(log(n)) instead O(n) (Martin Ankerl) Pull request description: This replaces the first-fit algorithm used in the Arena with a best-fit. According to "Dynamic Storage Allocation: A Survey and Critical Review", Wilson et. al. 1995, http://www.scs.stanford.edu/14wi-cs140/sched/readings/wilson.pdf, both startegies work well in practice. The advantage of using best-fit is that we can switch the O(n) allocation to O(log(n)). Additionally, some previously O(log(n)) operations are now O(1) operations by using hash maps. The end effect is that the benchmark runs about 2.5 times faster on my machine: # Benchmark, evals, iterations, total, min, max, median old: BenchLockedPool, 5, 530, 5.25749, 0.00196938, 0.00199755, 0.00198172 new: BenchLockedPool, 5, 1300, 5.11313, 0.000781493, 0.000793314, 0.00078606 I've run all unit tests and benchmarks, and increased the number of iterations so that BenchLockedPool takes about 5 seconds again. Tree-SHA512: 6551e384671f93f10c60df530a29a1954bd265cc305411f665a8756525e5afe2873a8032c797d00b6e8c07e16d9827465d0b662875433147381474a44119ccce
2018-01-03	Increment MIT Licence copyright header year on files modified in 2017	Akira Takizawa

2017-12-29	Use best-fit strategy in Arena, now O(log(n)) instead O(n)	Martin Ankerl
	This replaces the first-fit algorithm used in the Arena with a best-fit. According to "Dynamic Storage Allocation: A Survey and Critical Review", Wilson et. al. 1995, http://www.scs.stanford.edu/14wi-cs140/sched/readings/wilson.pdf, both startegies work well in practice. The advantage of using best-fit is that we can switch the slow O(n) algorithm to O(log(n)) operations. Additionally, some previously O(log(n)) operations are now replaced with O(1) operations by using a hash map. The end effect is that the benchmark runs about 2.5 times faster on my machine: old: BenchLockedPool, 5, 530, 5.25749, 0.00196938, 0.00199755, 0.00198172 new: BenchLockedPool, 5, 1300, 5.11313, 0.000781493, 0.000793314, 0.00078606 I've run all unit tests and benchmarks.
2017-09-16	Refactor: Modernize disallowed copy constructors/assignment	Dan Raviv
	Use C++11's better capability of expressing an interface of a non-copyable class by publicly deleting its copy ctor and assignment operator instead of just declaring them private.
2017-08-16	Declare single-argument (non-converting) constructors "explicit"	practicalswift
	In order to avoid unintended implicit conversions.
2017-08-16	Use nullptr instead of zero (0) as the null pointer constant	practicalswift

2016-11-28	Fix some typos	fsb4000

2016-11-02	LockedPool: avoid quadratic-time allocation	Kaz Wesley
	Use separate maps for used/free chunks to avoid linear scan through alloced chunks for each alloc.
2016-10-27	support: Add LockedPool	Wladimir J. van der Laan
	Add a pool for locked memory chunks, replacing LockedPageManager. This is something I've been wanting to do for a long time. The current approach of locking objects where they happen to be on the stack or heap in-place causes a lot of mlock/munlock system call overhead, slowing down any handling of keys. Also locked memory is a limited resource on many operating systems (and using a lot of it bogs down the system), so the previous approach of locking every page that may contain any key information (but also other information) is wasteful.