Optimize bitcount command by SIMD #1741

chzhoo · 2025-02-15T12:59:03Z

Background

Currently, we implement bitcount using a lookup table method
By SIMD, parallel table lookups can be achieved, which boosts performance
Most x86 servers support the AVX2 instruction set

BenchMark

Value Size	QPS (After optimization)	QPS (Before optimization)	change
16 B	114925	115924	-0.8%
256 B	112619	112201	+0.3%
4 KB	105523	96251	+9.6%
64 KB	79723	36796	+116%
1MB	21306	3466	+514%

CPU: AMD EPYC 9754 128-Core Processor * 8
OS: Ubuntu Server 22.04 LTS 64bit
Memory: 16GB
VM: Tencent cloud SA5.2XLARGE16

Test Plan
Pending. Will add test if it looks okay

Other
This PR is based on https://github.com/WojciechMula/sse-popcount/blob/master/popcnt-avx2-lookup.cpp

codecov · 2025-02-15T15:23:21Z

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.08%. Comparing base (3a64260) to head (114b338).
Report is 10 commits behind head on unstable.

Additional details and impacted files

@@            Coverage Diff            @@
##           unstable    #1741   +/-   ##
=========================================
  Coverage     71.08%   71.08%           
=========================================
  Files           123      123           
  Lines         65552    65583   +31     
=========================================
+ Hits          46596    46622   +26     
- Misses        18956    18961    +5

Files with missing lines	Coverage Δ
src/bitops.c	`90.00% <100.00%> (-3.63%)`	⬇️

... and 12 files with indirect coverage changes

xbasel · 2025-02-17T13:38:27Z

Can you add tests to make sure the same results are achieved, with, and without AVX?

chzhoo · 2025-02-17T14:22:41Z

@xbasel Sure! If there is anything I can help, please let me know.

xbasel · 2025-02-17T14:43:09Z

@xbasel Sure! If there is anything I can help, please let me know.

there was a typo :), I asked whether you can add tests (unless you think the existing tests are enough)

src/bitops.c

chzhoo · 2025-02-17T14:55:06Z

@xbasel Sure! If there is anything I can help, please let me know.

there was a typo :), I asked whether you can add tests (unless you think the existing tests are enough)

No problem, I will review the tests to ensure they are enough and get back to you.

src/bitops.c

chzhoo · 2025-02-18T15:57:14Z

Can you add tests to make sure the same results are achieved, with, and without AVX?

Test code to check scalar/vector result consistency has been committed.

src/bitops.c

src/unit/test_popcount.c

src/unit/test_bitops.c

src/unit/test_files.h

zuiderkwast

This is very good. Just some minor comments.

First I didn't understand anything of this AVX2 code, but I found the paper and I realized this was not invented in this PR. 😄

src/bitops.c

src/unit/test_bitops.c

zuiderkwast

Looks good to me.

Optimize bitcount command by SIMD Signed-off-by: chzhoo <[email protected]>

Fix complie warning Signed-off-by: chzhoo <[email protected]>

Forget include of stdint.h Signed-off-by: chzhoo <[email protected]>

Optimize unit test error messages Signed-off-by: chzhoo <[email protected]>

Add citations to the original author's work Signed-off-by: chzhoo <[email protected]>

src/unit/test_bitops.c

The unit test was added in #1741. It fails when compiled with UBSAN. Using a local array like `char buf[size]` is undefined behaviour when `size == 0`. This fix just makes it size 1 in this case. The failure I got locally: unit/test_bitops.c:28:13: runtime error: variable length array bound evaluates to non-positive value 0 Signed-off-by: Viktor Söderqvist <[email protected]>

In a recent PR valkey-io#1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, it fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. Signed-off-by: Ricardo Dias <[email protected]>

In a recent PR #1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. --------- Signed-off-by: Ricardo Dias <[email protected]> Signed-off-by: Ricardo Dias <[email protected]> Co-authored-by: Madelyn Olson <[email protected]>

**Background** - Currently, we implement bitcount using a lookup table method - By SIMD, parallel table lookups can be achieved, which boosts performance - Most x86 servers support the AVX2 instruction set **BenchMark** | Value Size | QPS (After optimization) | QPS (Before optimization) | change | | ---- | ---- | ---- | ---- | |16 B | 114925| 115924 | -0.8%| |256 B| 112619 | 112201| +0.3%| |4 KB| 105523|96251| +9.6%| |64 KB|79723|36796| +116%| |1MB|21306|3466|+514%| CPU: AMD EPYC 9754 128-Core Processor * 8 OS: Ubuntu Server 22.04 LTS 64bit Memory: 16GB VM: Tencent cloud SA5.2XLARGE16 **Test Plan** Pending. Will add test if it looks okay **Other** This PR is based on https://github.com/WojciechMula/sse-popcount/blob/master/popcnt-avx2-lookup.cpp --------- Signed-off-by: chzhoo <[email protected]>

The unit test was added in #1741. It fails when compiled with UBSAN. Using a local array like `char buf[size]` is undefined behaviour when `size == 0`. This fix just makes it size 1 in this case. The failure I got locally: unit/test_bitops.c:28:13: runtime error: variable length array bound evaluates to non-positive value 0 Signed-off-by: Viktor Söderqvist <[email protected]>

In a recent PR #1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. --------- Signed-off-by: Ricardo Dias <[email protected]> Signed-off-by: Ricardo Dias <[email protected]> Co-authored-by: Madelyn Olson <[email protected]>

**Background** - Currently, we implement bitcount using a lookup table method - By SIMD, parallel table lookups can be achieved, which boosts performance - Most x86 servers support the AVX2 instruction set **BenchMark** | Value Size | QPS (After optimization) | QPS (Before optimization) | change | | ---- | ---- | ---- | ---- | |16 B | 114925| 115924 | -0.8%| |256 B| 112619 | 112201| +0.3%| |4 KB| 105523|96251| +9.6%| |64 KB|79723|36796| +116%| |1MB|21306|3466|+514%| CPU: AMD EPYC 9754 128-Core Processor * 8 OS: Ubuntu Server 22.04 LTS 64bit Memory: 16GB VM: Tencent cloud SA5.2XLARGE16 **Test Plan** Pending. Will add test if it looks okay **Other** This PR is based on https://github.com/WojciechMula/sse-popcount/blob/master/popcnt-avx2-lookup.cpp --------- Signed-off-by: chzhoo <[email protected]>

The unit test was added in valkey-io#1741. It fails when compiled with UBSAN. Using a local array like `char buf[size]` is undefined behaviour when `size == 0`. This fix just makes it size 1 in this case. The failure I got locally: unit/test_bitops.c:28:13: runtime error: variable length array bound evaluates to non-positive value 0 Signed-off-by: Viktor Söderqvist <[email protected]>

In a recent PR valkey-io#1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. --------- Signed-off-by: Ricardo Dias <[email protected]> Signed-off-by: Ricardo Dias <[email protected]> Co-authored-by: Madelyn Olson <[email protected]>

**Background** - Currently, we implement bitcount using a lookup table method - By SIMD, parallel table lookups can be achieved, which boosts performance - Most x86 servers support the AVX2 instruction set **BenchMark** | Value Size | QPS (After optimization) | QPS (Before optimization) | change | | ---- | ---- | ---- | ---- | |16 B | 114925| 115924 | -0.8%| |256 B| 112619 | 112201| +0.3%| |4 KB| 105523|96251| +9.6%| |64 KB|79723|36796| +116%| |1MB|21306|3466|+514%| CPU: AMD EPYC 9754 128-Core Processor * 8 OS: Ubuntu Server 22.04 LTS 64bit Memory: 16GB VM: Tencent cloud SA5.2XLARGE16 **Test Plan** Pending. Will add test if it looks okay **Other** This PR is based on https://github.com/WojciechMula/sse-popcount/blob/master/popcnt-avx2-lookup.cpp --------- Signed-off-by: chzhoo <[email protected]>

The unit test was added in valkey-io#1741. It fails when compiled with UBSAN. Using a local array like `char buf[size]` is undefined behaviour when `size == 0`. This fix just makes it size 1 in this case. The failure I got locally: unit/test_bitops.c:28:13: runtime error: variable length array bound evaluates to non-positive value 0 Signed-off-by: Viktor Söderqvist <[email protected]>

In a recent PR valkey-io#1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. --------- Signed-off-by: Ricardo Dias <[email protected]> Signed-off-by: Ricardo Dias <[email protected]> Co-authored-by: Madelyn Olson <[email protected]>

In a recent PR valkey-io#1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. --------- Signed-off-by: Ricardo Dias <[email protected]> Signed-off-by: Ricardo Dias <[email protected]> Co-authored-by: Madelyn Olson <[email protected]> Signed-off-by: Shai Zarka <[email protected]>

**Background** - Currently, we implement bitcount using a lookup table method - By SIMD, parallel table lookups can be achieved, which boosts performance - Most x86 servers support the AVX2 instruction set **BenchMark** | Value Size | QPS (After optimization) | QPS (Before optimization) | change | | ---- | ---- | ---- | ---- | |16 B | 114925| 115924 | -0.8%| |256 B| 112619 | 112201| +0.3%| |4 KB| 105523|96251| +9.6%| |64 KB|79723|36796| +116%| |1MB|21306|3466|+514%| CPU: AMD EPYC 9754 128-Core Processor * 8 OS: Ubuntu Server 22.04 LTS 64bit Memory: 16GB VM: Tencent cloud SA5.2XLARGE16 **Test Plan** Pending. Will add test if it looks okay **Other** This PR is based on https://github.com/WojciechMula/sse-popcount/blob/master/popcnt-avx2-lookup.cpp --------- Signed-off-by: chzhoo <[email protected]>

The unit test was added in valkey-io#1741. It fails when compiled with UBSAN. Using a local array like `char buf[size]` is undefined behaviour when `size == 0`. This fix just makes it size 1 in this case. The failure I got locally: unit/test_bitops.c:28:13: runtime error: variable length array bound evaluates to non-positive value 0 Signed-off-by: Viktor Söderqvist <[email protected]>

In a recent PR valkey-io#1741 the new header `<immintrin.h>` was added, which transitively includes `<mm_malloc.h>` header, where a function called `_mm_malloc(...)` makes a call to the `malloc` function. The Valkey server code explicitly sets the malloc function as a deprecated function in `server.h`: ```c void *malloc(size_t size) __attribute__((deprecated)); ``` The Valkey server code is then compiled with `-Werror=deprecated-declarations` option to detect the uses of deprecated functions like `malloc`, and due to this, when the `bitops.c` file is compiled with Clang, fails with the following error: ``` In file included from bitops.c:33: In file included from /usr/lib/llvm-18/lib/clang/18/include/immintrin.h:26: In file included from /usr/lib/llvm-18/lib/clang/18/include/xmmintrin.h:31: /usr/lib/llvm-18/lib/clang/18/include/mm_malloc.h:35:12: error: 'malloc' is deprecated [-Werror,-Wdeprecated-declarations] 35 | return malloc(__size); | ^ ./server.h:3874:42: note: 'malloc' has been explicitly marked deprecated here 3874 | void *malloc(size_t size) __attribute__((deprecated)); ``` There is a difference in behavior though, between GCC and Clang. The `bitops.c` file compiles successfully with GCC. I don't know exactly why GCC does not issue a warning in this case. My best guess is that GCC does not issue warnings from code of the standard library. To fix the build error in clang, we explicitly use `pragma` macro to tell clang to ignore deprecated declarations warnings in `bitops.c`. --------- Signed-off-by: Ricardo Dias <[email protected]> Signed-off-by: Ricardo Dias <[email protected]> Co-authored-by: Madelyn Olson <[email protected]>

chzhoo force-pushed the simd_popcount branch 2 times, most recently from 4ba7902 to 8da4334 Compare February 15, 2025 13:39

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chzhoo added 2 commits February 21, 2025 23:52

Optimize bitcount command by SIMD

45c367c

Optimize bitcount command by SIMD Signed-off-by: chzhoo <[email protected]>

Update bitops.c

dc5dc80

Fix complie warning Signed-off-by: chzhoo <[email protected]>

chzhoo added 3 commits February 21, 2025 23:52

Forget include of stdint.h

0d45d49

Forget include of stdint.h Signed-off-by: chzhoo <[email protected]>

Optimize unit test error messages

2dbc6e5

Optimize unit test error messages Signed-off-by: chzhoo <[email protected]>

Add citations to the original author's work

114b338

Add citations to the original author's work Signed-off-by: chzhoo <[email protected]>

chzhoo force-pushed the simd_popcount branch from 097a241 to 114b338 Compare February 21, 2025 15:54

zuiderkwast added the release-notes This issue should get a line item in the release notes label Feb 25, 2025

zuiderkwast merged commit 79d5047 into valkey-io:unstable Feb 26, 2025
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zuiderkwast mentioned this pull request Feb 26, 2025

Fix undefined behaviour in bitops unit test #1786

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chzhoo deleted the simd_popcount branch February 27, 2025 04:55

rjd15372 mentioned this pull request Feb 27, 2025

Fix clang build error in bitops.c #1794

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madolson moved this from Candidate for release to Done in Valkey 8.1 Apr 7, 2025

zuiderkwast mentioned this pull request May 11, 2025

Optimize BITCOUNT using ARM NEON SIMD #1867

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TedLyngmo mentioned this pull request Sep 2, 2025

[BUG] Illegal instruction executed #2570

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zuiderkwast mentioned this pull request Sep 2, 2025

Don't use AVX2 instructions if the CPU don't support it #2571

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Optimize bitcount command by SIMD #1741

Optimize bitcount command by SIMD #1741

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