Comments (6)
eustas
commented on May 19, 2024
Thank you for your interest and detailed report.
shlxq works with quad-words -> only on 64-bit CPU. But I believe, this requirement is met, otherwise failure would have happened earlier.
Here it is said that "instruction is not supported in real mode and virtual-8086 mode", and again, I believe, it is not a problem.
Also, it is said, that instruction requires BMI2 CPU feature.
On OSX try sysctl -a | grep bmi2; for me it responds with hw.optional.bmi2: 1
On Linux try cat /proc/cpuinfo | grep bmi2 | head -n 1; it should respond with a long line like flags : ... bmi2 ...
Wikipedia says that: "Intel introduced BMI2 together with BMI1 in its line of Haswell processors. Only AMD has produced processors supporting only BMI1 without BMI2; BMI2 is supported by AMDs Excavator architecture and newer."
If the problem is missing BMI2 CPU feature, then try building with -mno-bmi2 flag.
Also, would be interesting to know it the binaries produced by Bazel also have this issue.
Bazel is easy to install on OSX (via Homebrew), and should also be easy to install on Ubuntu... After installation building is simple: bazel build -c opt :all, and binaries should appear in bazel-bin/
About attached image: it is 21600 x 10800 pixels = 2700 x 1350 8x8 blocks. Currently, it is bigger than kBrunsliMaxNumBlocks (3.5M > 2M). So, encoder will reject this image.
If you raise the limit, Brunsli should be able to compress this file successfully (27'201'049 bytes to 21'002'306 bytes). And decompress as well =) So, I believe, this limit should be configurable in the future.
from brunsli.
butterl
commented on May 19, 2024
Thanks for you reply!
The CPU flag problem has solved by adding flag to CMakeLists. Because I'm working behind a proxy， the bazel support lib downloading always fail (have to download by hand) , so the bazel result will delay for maybe some days
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e5d7a3..8c53002 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,6 +61,7 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} \
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} \
-mavx2 \
-mfma \
+ -mno-bmi2 \
-Xclang -mprefer-vector-width=128 \
-Xclang -target-cpu -Xclang haswell \
-Xclang -target-feature -Xclang +avx2")
after compiled with -mno-bmi2 flag still got into an Assert even with small test picture （81K）（I tried modified kBrunsliMaxNumBlocks bigger with large test pic， but got similar error）
It's there any other limitation to the compile flag？
ubuntu@ubuntu:~/code/paper/brunsli/build$ lldb-7 ./cbrunsli Joint-Photographic-Experts-Group-jpeg-1-1024x576.jpg
(lldb) target create "./cbrunsli"
Current executable set to './cbrunsli' (x86_64).
(lldb) settings set -- target.run-args "Joint-Photographic-Experts-Group-jpeg-1-1024x576.jpg"
(lldb) r
Process 26890 launched: '/home/ubuntu/code/paper/brunsli/build/cbrunsli' (x86_64)
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146WriteBits 1 0 147WriteBits 1 0 148WriteBits 1 0 149WriteBits 1 0 150WriteBits 1 0 151WriteBits 2 0 152WriteBits 2 1 154WriteBits 2 1 156cbrunsli: /home/ubuntu/code/paper/brunsli/c/enc/brunsli_encode.cc:495: void brunsli::Histogram::Add(int): Assertion `val < 18' failed.
Process 26890 stopped
* thread #1, name = 'cbrunsli', stop reason = signal SIGABRT
frame #0: 0x00007ffff71a1428 libc.so.6`__GI_raise(sig=6) at raise.c:54
(lldb) bt
* thread #1, name = 'cbrunsli', stop reason = signal SIGABRT
* frame #0: 0x00007ffff71a1428 libc.so.6`__GI_raise(sig=6) at raise.c:54
frame #1: 0x00007ffff71a302a libc.so.6`__GI_abort at abort.c:89
frame #2: 0x00007ffff7199bd7 libc.so.6`__assert_fail_base(fmt="", assertion=<unavailable>, file=<unavailable>, line=<unavailable>, function=<unavailable>) at assert.c:92
frame #3: 0x00007ffff7199c82 libc.so.6`__GI___assert_fail(assertion=<unavailable>, file=<unavailable>, line=<unavailable>, function=<unavailable>) at assert.c:101
frame #4: 0x00000000004488b5 cbrunsli`brunsli::Histogram::Add(int) + 69
frame #5: 0x000000000044883e cbrunsli`brunsli::EntropySource::AddCode(int, int) + 46
frame #6: 0x000000000044476a cbrunsli`brunsli::DataStream::AddCode(int, int, int, brunsli::EntropySource*) + 202
frame #7: 0x000000000043edc0 cbrunsli`brunsli::EncodeDC(int, int, int, int const*, int const*, short const**, short const**, std::vector<bool, std::allocator<bool> >*, brunsli::EntropySource*, brunsli::DataStream*) + 1376
frame #8: 0x0000000000440547 cbrunsli`brunsli::ProcessCoefficients(brunsli::JPEGData const&, brunsli::JPEGCodingState*) + 743
frame #9: 0x0000000000441667 cbrunsli`brunsli::BrunsliEncodeJpeg(brunsli::JPEGData const&, bool, unsigned char*, unsigned long*) + 647
frame #10: 0x0000000000433bb2 cbrunsli`ProcessFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) + 322
frame #11: 0x0000000000433d53 cbrunsli`main + 195
frame #12: 0x00007ffff718c830 libc.so.6`__libc_start_main(main=(cbrunsli`main), argc=2, argv=0x00007fffffffd338, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>, stack_end=0x00007fffffffd328) at libc-start.c:291
frame #13: 0x0000000000433599 cbrunsli`_start + 41
(lldb) up
frame #1: 0x00007ffff71a302a libc.so.6`__GI_abort at abort.c:89
(lldb) up
frame #2: 0x00007ffff7199bd7 libc.so.6`__assert_fail_base(fmt="", assertion=<unavailable>, file=<unavailable>, line=<unavailable>, function=<unavailable>) at assert.c:92
(lldb) up
frame #3: 0x00007ffff7199c82 libc.so.6`__GI___assert_fail(assertion=<unavailable>, file=<unavailable>, line=<unavailable>, function=<unavailable>) at assert.c:101
(lldb) up
frame #4: 0x00000000004488b5 cbrunsli`brunsli::Histogram::Add(int) + 69
cbrunsli`brunsli::Histogram::Add:
0x4488b5 <+69>: movslq -0xc(%rbp), %rax
0x4488b9 <+73>: movq -0x18(%rbp), %rcx
0x4488bd <+77>: movl (%rcx,%rax,4), %edx
0x4488c0 <+80>: addl $0x1, %edx
(lldb) up
frame #5: 0x000000000044883e cbrunsli`brunsli::EntropySource::AddCode(int, int) + 46
cbrunsli`brunsli::EntropySource::AddCode:
0x44883e <+46>: addq $0x10, %rsp
0x448842 <+50>: popq %rbp
0x448843 <+51>: retq
0x448844: nopw %cs:(%rax,%rax)
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eustas
commented on May 19, 2024
Perhaps -Xclang -target-cpu -Xclang haswell. Try remoing it, instead of adding -mno-bmi2.
from brunsli.
eustas
commented on May 19, 2024
About the test image: it seems that something else is subtly broken, works well on my Mac both with CMake- and Bazel-built binaries.
As I've mentioned, for CMake too many assumptions are made about target machine. Try to strip them all (first "CPU flags", if it does not help, then "Machine flags").
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butterl
commented on May 19, 2024
Thanks, the error solved and the 26M image after compressing，reduced to 21M and the compress/decompress time is about 10s with Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz（32 core）
Dose it now compress/decompress only use one core？
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eustas
commented on May 19, 2024
Currently, yes.
We are planning to support multi-core in future:
color components are fully independent already, and inside color component we could work in slices with some minor compression ratio loss.
Unfortunately, can not give any promises, on when this feature will be available.
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Related Issues (20)
- which type of ANS does brunsli use? HOT 3
- Is brunsli's ANS using static probability distributions? HOT 2
- Idea: https://brunsli.dev/split.html?progressive image resolution
- Add ratio to brunsli.dev
- brunsli.dev cannot decode JPEG compressed by recent cbrunsli.exe builds (CMake build 78 and newer) HOT 3
- [openSUSE] W: shared-lib-calls-exit from RPMLINT HOT 7
- core dumped when turn on Multithreading switch HOT 2
- File signature HOT 6
- CI: Add tests HOT 2
- HDR JPEG support? HOT 1
- Latest build? HOT 3
- Unable to finish the compress/decompress task when enables multithread mode on Android HOT 1
- Compiler is not EMSCRIPTEN HOT 1
- Plans for a new release? HOT 2
- Mode without preserving structure of the original JPEG file HOT 3
- Arithmetic coded JPEG support HOT 2
- Brunsli cannot decode JPEG that was compressed in JPEG XL's reference software's unofficial build HOT 3
- Build with dyanmically loaded libraries
- What is the public API that should be exported? HOT 1
- Encoding is 10x slower with Safari HOT 2
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