From: Christopher Dykes <cdykes@fb.com>
Date: Tue, 11 Jul 2017 20:45:18 +0000 (-0700)
Subject: Add an sfmt19937 benchmark
X-Git-Tag: v2017.07.17.00~23
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4169222e2f6da6ab300df01df71a46e6a1c38eac;p=folly.git

Add an sfmt19937 benchmark

Summary: `__gnu_cxx::sfmt19937` is 3.5x faster than `std::mt19937` according to the benchmark.

Reviewed By: yfeldblum

Differential Revision: D5393697

fbshipit-source-id: bc725838dc7f62d030c7e68bc6d229042df2b46c
---

diff --git a/folly/test/RandomBenchmark.cpp b/folly/test/RandomBenchmark.cpp
index 287482e5..b0991f17 100644
--- a/folly/test/RandomBenchmark.cpp
+++ b/folly/test/RandomBenchmark.cpp
@@ -46,6 +46,18 @@ BENCHMARK(mt19937, n) {
   FOR_EACH_RANGE(i, 0, n) { doNotOptimizeAway(rng()); }
 }
 
+#if FOLLY_HAVE_EXTRANDOM_SFMT19937
+BENCHMARK(sfmt19937, n) {
+  BenchmarkSuspender braces;
+  std::random_device rd;
+  __gnu_cxx::sfmt19937 rng(rd());
+
+  braces.dismiss();
+
+  FOR_EACH_RANGE(i, 0, n) { doNotOptimizeAway(rng()); }
+}
+#endif
+
 BENCHMARK(threadprng, n) {
   BenchmarkSuspender braces;
   ThreadLocalPRNG tprng;