Nikolay, Could you please review changes?
On Mon, Feb 12, 2018 at 3:23 PM, Александр Меньшиков <sharple...@gmail.com> wrote: > Hi, guys! I'm waiting (more than 2 months) for CR ignite-4908 ( > https://issues.apache.org/jira/browse/IGNITE-4908 all links inside). It's > about Ignite.reentrantlock. > > 2017-11-29 12:35 GMT+03:00 Александр Меньшиков <sharple...@gmail.com>: > >> Igniters, >> >> I’ve implemented new fast reentrant lock within an issue[1]. >> >> Could someone review prepared PR [2, 3, 4]? >> >> Some details are described below. >> >> The main idea: >> >> Current locks implementation is based on shared states in a cache, while >> the new lock uses IgniteCache#invoke* methods to update shared state >> atomically. New lock implementation doesn’t use a continuous query, so the >> cache became atomic now. >> >> New lock implementation has two types: fair and unfair, split into >> different classes for performance reasons. >> >> Some benchmarks results (hardware: Core i5 (2 gen) + 6GB RAM): >> >> Speed up: single thread + fair: 21.9x (1 node), 3.4x (2 nodes), 9.9x (5 >> nodes), 17.9x (10 nodes) >> >> Speed up: single thread + unfair: 22.4x (1 node), 3.2x (2 nodes), 8.0x (5 >> nodes), 19.0x (10 nodes) >> >> Speed up: multi-threads + fair: 3.9x (1 n,2 t), 3.5x (1 n,10t), 13.5x >> (5 n,2t), 15.0x (5n, 10t) >> >> Speed up: multi-threads + unfair: 33.5x (1 n,2t), 210x (1 n,10t), 318x >> (5 n,2t), 389x (5n, 10t) >> >> Benchmarks’ summary: >> >> 1) The unfair lock has a local reentrant lock which is used for local >> synchronization as a guard before the shared state. This allows reaching >> performance close to a local reentrant lock. >> >> 2) One server node can be a primary one for the shared state, this gives >> us a performance boost on one node only. >> >> 3) Speedup grows with a number of nodes. >> >> >> [1] JIRA: https://issues.apache.org/jira/browse/IGNITE-4908 >> >> [2] PR: https://github.com/apache/ignite/pull/2360 >> >> [3] Upsource review: https://reviews.ignite.apache. >> org/ignite/review/IGNT-CR-248 >> >> [4] Team City: https://ci.ignite.apache.org/p >> roject.html?projectId=Ignite20Tests&branch_Ignite20Tests= >> pull%2F2360%2Fhead >> > >
