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redict/deps/hdr_histogram
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yoav-steinberg 5075e74366
Optimized hdr_value_at_percentile (#10606) 
`hdr_value_at_percentile()` is part of the Hdr_Histogram library
used when generating `latencystats` report. 

There's a pending optimization for this function which greatly
affects the performance of `info latencystats`.
https://github.com/HdrHistogram/HdrHistogram_c/pull/107

This PR:
1. Upgrades the sources in _deps/hdr_histogram_ to the latest Hdr_Histogram
  version 0.11.5
2. Applies the referenced optimization.
3. Adds minor documentation about the hdr_histogram dependency which was
  missing under _deps/README.md_.

benchmark on my machine:
running: `redis-benchmark -n 100000 info latencystats` on a clean build with no data.

| benchmark | RPS |
| ---- | ---- |
| before upgrade to v0.11.05  | 7,681 |
| before optimization | 12,474 |
| after optimization | 52,606 |

Co-authored-by: filipe oliveira <filipecosta.90@gmail.com>
2022-04-20 09:38:20 +03:00
..
COPYING.txt Extended redis-benchmark instant metrics and overall latency report (#7600) 2020-08-25 21:21:29 +03:00
hdr_atomic.h Extended redis-benchmark instant metrics and overall latency report (#7600) 2020-08-25 21:21:29 +03:00
hdr_histogram.c Optimized hdr_value_at_percentile (#10606) 2022-04-20 09:38:20 +03:00
hdr_histogram.h Optimized hdr_value_at_percentile (#10606) 2022-04-20 09:38:20 +03:00
hdr_redis_malloc.h Optimized hdr_value_at_percentile (#10606) 2022-04-20 09:38:20 +03:00
hdr_tests.h Optimized hdr_value_at_percentile (#10606) 2022-04-20 09:38:20 +03:00
LICENSE.txt Extended redis-benchmark instant metrics and overall latency report (#7600) 2020-08-25 21:21:29 +03:00
Makefile Optimized hdr_value_at_percentile (#10606) 2022-04-20 09:38:20 +03:00
README.md Optimized hdr_value_at_percentile (#10606) 2022-04-20 09:38:20 +03:00

README.md

HdrHistogram_c v0.11.5

This port contains a subset of the 'C' version of High Dynamic Range (HDR) Histogram available at github.com/HdrHistogram/HdrHistogram_c.

The code present on hdr_histogram.c, hdr_histogram.h, and hdr_atomic.c was Written by Gil Tene, Michael Barker, and Matt Warren, and released to the public domain, as explained at http://creativecommons.org/publicdomain/zero/1.0/.