crypto,tls: perf improvements for crypto and tls getCiphers

Improve performance of crypto.getCiphers, getHashes, getCurves
and tls.getCiphers by consolidating filterDuplicates logic, adding
caching of output, and streamlining filterDuplicates implementation.

Benchmarks:

crypto.getCiphers n=1    v6.2.1 = 2559.3, new = 15890 ...... -83.89%
crypto.getCiphers n=5000 v6.2.1 = 3516.3, new = 24203000 ... -99.99%

tls.getCiphers    n=1    v6.2.1 = 3405.3, new = 14877 ...... -77.11%
tls.getCiphers    n=5000 v6.2.1 = 6074.4, new = 24202000 ... -99.97%

PR-URL: https://github.com/nodejs/node/pull/7225
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/benchmark/crypto/get-ciphers.js b/benchmark/crypto/get-ciphers.js
new file mode 100644
index 0000000000..257c9af2fd
--- /dev/null
+++ b/benchmark/crypto/get-ciphers.js
@@ -0,0 +1,20 @@
+'use strict';
+
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  n: [1, 5000],
+  v: ['crypto', 'tls']
+});
+
+function main(conf) {
+  const n = +conf.n;
+  const v = conf.v;
+  const method = require(v).getCiphers;
+  var i = 0;
+
+  common.v8ForceOptimization(method);
+  bench.start();
+  for (; i < n; i++) method();
+  bench.end(n);
+}