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Joined 1 year ago
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Cake day: November 1st, 2023

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  • Trying cranelift for the first time (I think).

    Let’s create a “release-dev-cl” profile that inherits “release-dev” profile and compare.

    For reference, “release-dev” is:

    inherits = "release"
    debug = "full"
    codegen-units = 8
    lto = "off"
    

    Cool, cold builds (including deps) went from 73s to 37s, with zstd-sys becoming a bigger offender.

    But but but…

    warning: unsupported x86 llvm intrinsic llvm.x86.aesni.aesimc; replacing with trap
    warning: unsupported x86 llvm intrinsic llvm.x86.aesni.aesdec; replacing with trap
    warning: unsupported x86 llvm intrinsic llvm.x86.aesni.aesdeclast; replacing with trap
    

    Alright. Which dep is using this. Let’s cargo vendor and rg.

    % cargo vendor &>/dev/null
    % cd vendor
    % rg -l 'aesimc|aesdec|aesdeclast' | sed 's|/.*||' | sort -u
    aes
    ring
    

    reported

    Alright, let’s try another project…

    Nice, this one goes from 52s to 19s, and no unsupported intrinsics.

    Let’s test the binary.

    Hmm, it’s orders of magnitude slower… let’s perf

    • LLVM
       1.71%  async-global-ex  abcd-cli              [.] alloc::collections::btree::map::IntoIterᐸK,V,Aᐳ::dying_next                                   
       1.66%  async-global-ex  abcd-cli              [.] ᐸalloc::collections::btree::map::KeysᐸK,Vᐳ as core::iter::traits::iterator::Iteratorᐳ::next   
       1.53%  async-global-ex  libc.so.6             [.] 0x0000000000158c4a                                                                            
       1.48%  blocking-4       abcd-cli              [.] ᐸlz4_flex::frame::decompress::FrameDecoderᐸRᐳ as std::io::Readᐳ::read_to_end                  
       1.35%  async-global-ex  libc.so.6             [.] 0x000000000015818d                                                                            
       1.28%  blocking-1       abcd-cli              [.] ᐸlz4_flex::frame::decompress::FrameDecoderᐸRᐳ as std::io::Readᐳ::read_to_end                  
       1.25%  blocking-4       abcd-cli              [.] ᐸcore::iter::adapters::map::MapᐸI,Fᐳ as core::iter::traits::iterator::Iteratorᐳ::try_fold     
       1.25%  async-global-ex  libc.so.6             [.] malloc                                                                                        
       1.19%  blocking-4       libc.so.6             [.] malloc                                                                                        
       1.12%  blocking-2       abcd-cli              [.] ᐸlz4_flex::frame::decompress::FrameDecoderᐸRᐳ as std::io::Readᐳ::read_to_end                  
       1.06%  async-global-ex  libc.so.6             [.] 0x0000000000158487                                                                            
       0.99%  async-global-ex  abcd-cli              [.] ᐸalloc::collections::btree::map::BTreeMapᐸK,V,Aᐳ as core::ops::drop::Dropᐳ::drop              
       0.92%  blocking-2       libc.so.6             [.] malloc                                                                                        
       0.91%  blocking-4       libc.so.6             [.] 0x0000000000158180                                                                            
       0.85%  blocking-2       [kernel.vmlinux]      [k] clear_page_erms                                                                               
       0.84%  async-global-ex  abcd-cli              [.] alloc::collections::btree::search::ᐸimpl alloc::collections::btree::node::NodeRefᐸBorrowType, 
       0.81%  async-global-ex  abcd-cli              [.] abcd::all::ELSMap::mk_extracted_st                                                            
       0.78%  blocking-1       libc.so.6             [.] malloc                                                                                        
       0.75%  blocking-4       abcd-cli              [.] core::str::converts::from_utf8                                                                
       0.75%  async-global-ex  [kernel.vmlinux]      [k] clear_page_erms                                                                               
       0.74%  async-global-ex  abcd-cli              [.] core::ptr::drop_in_placeᐸabcd::foo::FooStream0.74%  async-global-ex  abcd-cli              [.] ᐸalloc::string::String as core::fmt::Writeᐳ::write_str                                        
       0.74%  blocking-4       libc.so.6             [.] 0x000000000015818d                                                                            
       0.74%  async-global-ex  libc.so.6             [.] 0x000000000009a9f8                                                                            
       0.66%  async-global-ex  abcd-cli              [.] alloc::raw_vec::RawVecᐸT,Aᐳ::reserve::do_reserve_and_handle                                                                 
    
    • Cranelift
      13.54%  async-global-ex  abcd-cli              [.] alloc::vec::VecᐸT,Aᐳ::extend_with                                                             
       2.34%  async-global-ex  abcd-cli              [.] ᐸusize as core::iter::range::Stepᐳ::forward_unchecked                                         
       1.57%  async-global-ex  libc.so.6             [.] 0x000000000015818d                                                                            
       1.38%  async-global-ex  abcd-cli              [.] core::clone::impls::ᐸimpl core::clone::Clone for u8ᐳ::clone                                   
       1.34%  blocking-4       abcd-cli              [.] lz4_flex::block::decompress_safe::decompress_internal                                         
       1.18%  async-global-ex  abcd-cli              [.] ᐸcore::iter::adapters::enumerate::EnumerateᐸIᐳ as core::iter::traits::iterator::Iteratorᐳ::ne 
       1.09%  blocking-4       abcd-cli              [.] lz4_flex::block::decompress_safe::read_u16                                                    
       1.00%  blocking-4       libc.so.6             [.] 0x000000000015818d                                                                            
       0.97%  blocking-3       abcd-cli              [.] lz4_flex::block::decompress_safe::read_u16                                                    
       0.94%  async-global-ex  abcd-cli              [.] alloc::collections::btree::search::ᐸimpl alloc::collections::btree::node::NodeRefᐸBorrowType, 
       0.86%  blocking-2       abcd-cli              [.] lz4_flex::block::decompress_safe::read_u16                                                    
       0.84%  blocking-4       abcd-cli              [.] ᐸcore::ops::range::Rangeᐸusizeas core::slice::index::SliceIndexᐸ[T]ᐳᐳ::index_mut            
       0.77%  blocking-2       abcd-cli              [.] lz4_flex::block::decompress_safe::decompress_internal                                         
       0.72%  async-global-ex  abcd-cli              [.] ᐸcore::slice::iter::IterᐸTᐳ as core::iter::traits::iterator::Iteratorᐳ::next                  
       0.71%  blocking-3       abcd-cli              [.] ᐸcore::ops::range::Rangeᐸusizeas core::slice::index::SliceIndexᐸ[T]ᐳᐳ::index_mut            
       0.69%  blocking-3       libc.so.6             [.] 0x000000000015818d                                                                            
       0.68%  blocking-2       libc.so.6             [.] 0x000000000015818d                                                                            
       0.67%  blocking-4       abcd-cli              [.] ᐸcore::ops::range::Rangeᐸusizeas core::slice::index::SliceIndexᐸ[T]ᐳᐳ::index                
       0.67%  blocking-3       abcd-cli              [.] lz4_flex::block::decompress_safe::decompress_internal                                         
       0.62%  blocking-2       abcd-cli              [.] ᐸcore::ops::range::Rangeᐸusizeas core::slice::index::SliceIndexᐸ[T]ᐳᐳ::index_mut            
       0.60%  blocking-3       abcd-cli              [.] ᐸcore::ops::range::Rangeᐸusizeas core::slice::index::SliceIndexᐸ[T]ᐳᐳ::index                
       0.57%  blocking-3       abcd-cli              [.] speedy::circular_buffer::CircularBuffer::consume_into                                         
       0.56%  async-global-ex  abcd-cli              [.] alloc::collections::btree::search::ᐸimpl alloc::collections::btree::node::NodeRefᐸBorrowType, 
       0.56%  blocking-4       abcd-cli              [.] speedy::circular_buffer::CircularBuffer::consume_into                                         
       0.54%  blocking-3       abcd-cli              [.] speedy::reader::Reader::read_u64                                                              
    

    Ouch, Vec::extend_with(), usize::forward_unchecked(), and even worse, u8::clone() are slow!