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Import dependencies

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Mahmoud Al-Qudsi 5 years ago
parent 847ebdba43
commit fc564f19b2
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19
COPYING
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// Copyright (c) 2011 Google, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

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CityHash v1.1.1, June 17, 2013
* Fix CityHash32() so platforms that disagree about whether 'char' is signed
use the same mathematical function. For most people this changes nothing
as most popular platforms agree with x86 about whether 'char' is signed.
* No changes to any of the functions, unless you had been using CityHash32()
despite "make check" reporting a failure on your platform.
* Slightly modernize and improve configuration and portability.
CityHash v1.1, October 22, 2012
* Add CityHash32(), intended for 32-bit platforms.
* Change existing functions to improve their hash quality and/or speed. Most
of the changes were minor, but CityHashCrc* was substantially reworked
(and made perhaps 10% slower, unfortunately).
* Improve README.
CityHash v1.0.3, October 6, 2011
* Change all the functions to improve their hash quality. Most of the
changes were minor. Special thanks to Bob Jenkins for reporting some
issues that he'd found. The speed of the functions after these changes is
roughly unchanged, except that CityHash128() and CityHash128WithSeed() are
slower.
* To improve portability, replace the one use of ssize_t with signed long.
* Improve README.
CityHash v1.0.2, May 8, 2011
* Correct a problem in CityHashCrc256(); for inputs under 240 bytes the
scheme of padding to 240 bytes was causing the empty string and an input
of exactly 240 NULs to have the same hash code. That is now fixed.
Most strings less than 240 bytes long will have a different hash than
they did in v1.0.1.
* Other hash functions are unchanged.
* Minor corrections and improvements to README.
CityHash v1.0.1, April 28, 2011
* Added README, NEWS, and COPYING. The README contains installation and
usage instructions, information on "hash quality," and other goodies.
* Improved how CityHash128() and CityHash128WithSeed() handle very short
input strings.
* Added new functions that are faster on long strings on 64-bit CPUs with
a CRC32 instruction: CityHashCrc128(), CityHashCrc128WithSeed(), and
CityHashCrc256().
* Removed our assumption that "*(const uint64*)p" and such is safe. Now we
memcpy() instead. It has no speed penalty and makes our intent explicit
to the compiler.
* Changed #include "city.h" to #include <city.h>, suggested by Robert Escriva.
* Added build system, a modified version of one contributed by Robert Escriva.
* We now use __builtin_expect if the configure script can make it work, rather
than just on gcc.
* Added a test: use "make check" to run it. If you compile CityHash in a way
that causes it to return unexpected results, the test should fail.
* Added untested big-endian support. Please let us know if you try it!
* Other than CityHash128() and CityHash128WithSeed(), the hash functions in
the previous release are unchanged.
CityHash v1, April 11, 2011
* Initial release

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CityHash, a family of hash functions for strings.
Introduction
============
CityHash provides hash functions for strings. The functions mix the
input bits thoroughly but are not suitable for cryptography. See
"Hash Quality," below, for details on how CityHash was tested and so on.
We provide reference implementations in C++, with a friendly MIT license.
CityHash32() returns a 32-bit hash.
CityHash64() and similar return a 64-bit hash.
CityHash128() and similar return a 128-bit hash and are tuned for
strings of at least a few hundred bytes. Depending on your compiler
and hardware, it's likely faster than CityHash64() on sufficiently long
strings. It's slower than necessary on shorter strings, but we expect
that case to be relatively unimportant.
CityHashCrc128() and similar are variants of CityHash128() that depend
on _mm_crc32_u64(), an intrinsic that compiles to a CRC32 instruction
on some CPUs. However, none of the functions we provide are CRCs.
CityHashCrc256() is a variant of CityHashCrc128() that also depends
on _mm_crc32_u64(). It returns a 256-bit hash.
All members of the CityHash family were designed with heavy reliance
on previous work by Austin Appleby, Bob Jenkins, and others.
For example, CityHash32 has many similarities with Murmur3a.
Performance on long strings: 64-bit CPUs
========================================
We are most excited by the performance of CityHash64() and its variants on
short strings, but long strings are interesting as well.
CityHash is intended to be fast, under the constraint that it hash very
well. For CPUs with the CRC32 instruction, CRC is speedy, but CRC wasn't
designed as a hash function and shouldn't be used as one. CityHashCrc128()
is not a CRC, but it uses the CRC32 machinery.
On a single core of a 2.67GHz Intel Xeon X5550, CityHashCrc256 peaks at about
5 to 5.5 bytes/cycle. The other CityHashCrc functions are wrappers around
CityHashCrc256 and should have similar performance on long strings.
(CityHashCrc256 in v1.0.3 was even faster, but we decided it wasn't as thorough
as it should be.) CityHash128 peaks at about 4.3 bytes/cycle. The fastest
Murmur variant on that hardware, Murmur3F, peaks at about 2.4 bytes/cycle.
We expect the peak speed of CityHash128 to dominate CityHash64, which is
aimed more toward short strings or use in hash tables.
For long strings, a new function by Bob Jenkins, SpookyHash, is just
slightly slower than CityHash128 on Intel x86-64 CPUs, but noticeably
faster on AMD x86-64 CPUs. For hashing long strings on AMD CPUs
and/or CPUs without the CRC instruction, SpookyHash may be just as
good or better than any of the CityHash variants.
Performance on short strings: 64-bit CPUs
=========================================
For short strings, e.g., most hash table keys, CityHash64 is faster than
CityHash128, and probably faster than all the aforementioned functions,
depending on the mix of string lengths. Here are a few results from that
same hardware, where we (unrealistically) tested a single string length over
and over again:
Hash Results
------------------------------------------------------------------------------
CityHash64 v1.0.3 7ns for 1 byte, or 6ns for 8 bytes, or 9ns for 64 bytes
Murmur2 (64-bit) 6ns for 1 byte, or 6ns for 8 bytes, or 15ns for 64 bytes
Murmur3F 14ns for 1 byte, or 15ns for 8 bytes, or 23ns for 64 bytes
We don't have CityHash64 benchmarks results for v1.1, but we expect the
numbers to be similar.
Performance: 32-bit CPUs
========================
CityHash32 is the newest variant of CityHash. It is intended for
32-bit hardware in general but has been mostly tested on x86. Our benchmarks
suggest that Murmur3 is the nearest competitor to CityHash32 on x86.
We don't know of anything faster that has comparable quality. The speed rankings
in our testing: CityHash32 > Murmur3f > Murmur3a (for long strings), and
CityHash32 > Murmur3a > Murmur3f (for short strings).
Installation
============
We provide reference implementations of several CityHash functions, written
in C++. The build system is based on autoconf. It defaults the C++
compiler flags to "-g -O2", which is probably slower than -O3 if you are
using gcc. YMMV.
On systems with gcc, we generally recommend:
./configure
make all check CXXFLAGS="-g -O3"
sudo make install
Or, if your system has the CRC32 instruction, and you want to build everything:
./configure --enable-sse4.2
make all check CXXFLAGS="-g -O3 -msse4.2"
sudo make install
Note that our build system doesn't try to determine the appropriate compiler
flag for enabling SSE4.2. For gcc it is "-msse4.2". The --enable-sse4.2
flag to the configure script controls whether citycrc.h is installed when
you "make install." In general, picking the right compiler flags can be
tricky, and may depend on your compiler, your hardware, and even how you
plan to use the library.
For generic information about how to configure this software, please try:
./configure --help
Failing that, please work from city.cc and city*.h, as they contain all the
necessary code.
Usage
=====
The above installation instructions will produce a single library. It will
contain CityHash32(), CityHash64(), and CityHash128(), and their variants,
and possibly CityHashCrc128(), CityHashCrc128WithSeed(), and
CityHashCrc256(). The functions with Crc in the name are declared in
citycrc.h; the rest are declared in city.h.
Limitations
===========
1) CityHash32 is intended for little-endian 32-bit code, and everything else in
the current version of CityHash is intended for little-endian 64-bit CPUs.
All functions that don't use the CRC32 instruction should work in
little-endian 32-bit or 64-bit code. CityHash should work on big-endian CPUs
as well, but we haven't tested that very thoroughly yet.
2) CityHash is fairly complex. As a result of its complexity, it may not
perform as expected on some compilers. For example, preliminary reports
suggest that some Microsoft compilers compile CityHash to assembly that's
10-20% slower than it could be.
Hash Quality
============
We like to test hash functions with SMHasher, among other things.
SMHasher isn't perfect, but it seems to find almost any significant flaw.
SMHasher is available at http://code.google.com/p/smhasher/
SMHasher is designed to pass a 32-bit seed to the hash functions it tests.
No CityHash function is designed to work that way, so we adapt as follows:
For our functions that accept a seed, we use the given seed directly (padded
with zeroes); for our functions that don't accept a seed, we hash the
concatenation of the given seed and the input string.
The CityHash functions have the following flaws according to SMHasher:
(1) CityHash64: none
(2) CityHash64WithSeed: none
(3) CityHash64WithSeeds: did not test
(4) CityHash128: none
(5) CityHash128WithSeed: none
(6) CityHashCrc128: none
(7) CityHashCrc128WithSeed: none
(8) CityHashCrc256: none
(9) CityHash32: none
Some minor flaws in 32-bit and 64-bit functions are harmless, as we
expect the primary use of these functions will be in hash tables. We
may have gone slightly overboard in trying to please SMHasher and other
similar tests, but we don't want anyone to choose a different hash function
because of some minor issue reported by a quality test.
For more information
====================
http://code.google.com/p/cityhash/
cityhash-discuss@googlegroups.com
Please feel free to send us comments, questions, bug reports, or patches.

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