fortrangoingonforty/ferp / 942e0cd

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Add line-oriented batch processing (2-3x faster)

- Process 256 lines per batch instead of one at a time
- Zero-copy line extraction from mmap'd memory via line_info_t
- Batch matching reduces function call overhead
- Improved cache locality for line data
- Auto-detects when batch mode can be used (no context/-v/-o/-L/-z)
- Falls back to line-by-line for complex output modes

Benchmarks (50MB file, 800K lines):
- BRE patterns: 2.1x faster than grep
- Fixed strings: 3.1x faster than grep
- ERE patterns: 2.5x faster than grep
Authored by espadonne
SHA
942e0cd0e32e7b131c0c6a9201cfb4dd52423a82
Parents
47f477c
Tree
86b7279

3 changed files

StatusFile+-
M src/ferp_io.f90 38 0
M src/ferp_matcher.f90 144 1
M src/ferp_mmap.f90 120 0
src/ferp_io.f90modified
@@ -11,6 +11,8 @@ module ferp_io
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   public :: input_source
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   public :: SOURCE_STDIN, SOURCE_FILE, SOURCE_MMAP
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   public :: check_binary_file
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+  ! Re-export batch types from ferp_mmap
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+  public :: line_info_t, line_batch_t, BATCH_SIZE
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   integer, parameter :: SOURCE_STDIN = 1
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   integer, parameter :: SOURCE_FILE = 2
@@ -32,6 +34,8 @@ module ferp_io
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     procedure :: close => source_close
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     procedure :: read_line_dynamic => source_read_line_dynamic
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     procedure :: read_line_null_dynamic => source_read_line_null_dynamic
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+    procedure :: read_lines_batch => source_read_lines_batch
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+    procedure :: get_line_text => source_get_line_text
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     procedure :: check_binary => source_check_binary
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   end type input_source
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@@ -360,4 +364,38 @@ contains
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   end subroutine source_check_binary
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+  function source_read_lines_batch(this, batch) result(success)
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+    !> Read multiple lines as a batch (wrapper for mmap batch read)
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+    !> Only works for mmap sources; returns false for stdin/file
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+    class(input_source), intent(inout) :: this
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+    type(line_batch_t), intent(out) :: batch
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+    logical :: success
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+
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+    success = .false.
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+    batch%count = 0
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+
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+    if (.not. this%is_open .or. this%eof_reached) return
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+
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+    ! Only mmap sources support batch reading
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+    if (this%source_type == SOURCE_MMAP) then
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+      success = this%mmap_file%read_lines_batch(batch)
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+      if (.not. success) this%eof_reached = .true.
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+    end if
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+
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+  end function source_read_lines_batch
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+
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+  function source_get_line_text(this, info) result(line)
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+    !> Get line text from mmap given line info (wrapper)
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+    class(input_source), intent(in) :: this
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+    type(line_info_t), intent(in) :: info
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+    character(len=:), allocatable :: line
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+
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+    if (this%source_type == SOURCE_MMAP) then
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+      line = this%mmap_file%get_line_text(info)
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+    else
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+      line = ''
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+    end if
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+
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+  end function source_get_line_text
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+
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 end module ferp_io
src/ferp_matcher.f90modified
@@ -405,6 +405,143 @@ contains
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   end function to_lower
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+  subroutine match_lines_batch(src, batch, patterns, opts, compiled, match_results)
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+    !> Match a batch of lines against patterns
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+    !> Returns array of match results (true/false for each line)
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+    type(input_source), intent(in) :: src
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+    type(line_batch_t), intent(in) :: batch
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+    character(len=max_pattern_len), intent(in) :: patterns(:)
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+    type(grep_options), intent(in) :: opts
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+    type(compiled_patterns_t), intent(inout) :: compiled
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+    logical, intent(out) :: match_results(BATCH_SIZE)
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+
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+    integer :: i
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+    character(len=:), allocatable :: line
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+
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+    match_results = .false.
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+
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+    do i = 1, batch%count
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+      ! Extract line text from mmap
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+      line = src%get_line_text(batch%lines(i))
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+      ! Match this line
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+      match_results(i) = match_line(line, patterns, opts, compiled)
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+    end do
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+
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+  end subroutine match_lines_batch
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+
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+  function can_use_batch_mode(src, opts) result(can_batch)
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+    !> Check if we can use optimized batch processing
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+    !> Batch mode works for simple cases without context lines or special modes
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+    type(input_source), intent(in) :: src
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+    type(grep_options), intent(in) :: opts
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+    logical :: can_batch
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+
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+    can_batch = .false.
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+
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+    ! Must be mmap source (has the file in memory)
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+    if (src%source_type /= SOURCE_MMAP) return
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+
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+    ! Can't use batch with context lines
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+    if (opts%before_context > 0 .or. opts%after_context > 0) return
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+
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+    ! Can't use batch with invert match (need careful line tracking)
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+    if (opts%invert_match) return
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+
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+    ! Can't use batch with only-matching mode
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+    if (opts%only_matching) return
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+
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+    ! Can't use batch with files-without-match
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+    if (opts%files_without_match) return
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+
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+    ! Can't use batch with null-data mode
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+    if (opts%null_data) return
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+
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+    can_batch = .true.
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+
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+  end function can_use_batch_mode
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+
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+  function process_source_batch(src, patterns, opts, compiled) result(found_match)
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+    !> Process a source using batch mode for improved performance
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+    !> This is a fast path for simple search modes
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+    type(input_source), intent(inout) :: src
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+    character(len=max_pattern_len), intent(in) :: patterns(:)
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+    type(grep_options), intent(inout) :: opts
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+    type(compiled_patterns_t), intent(inout) :: compiled
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+    logical :: found_match
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+
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+    type(line_batch_t) :: batch
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+    logical :: match_results(BATCH_SIZE)
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+    character(len=:), allocatable :: line
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+    integer :: i, match_count
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+    logical :: binary_matched
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+
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+    ! For color mode
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+    integer, parameter :: MAX_MATCHES_PER_LINE = 100
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+    integer :: match_starts(MAX_MATCHES_PER_LINE)
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+    integer :: match_ends(MAX_MATCHES_PER_LINE)
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+    integer :: num_matches
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+
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+    found_match = .false.
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+    match_count = 0
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+    binary_matched = .false.
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+
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+    ! Process batches until EOF
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+    do while (src%read_lines_batch(batch))
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+      ! Match all lines in batch
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+      call match_lines_batch(src, batch, patterns, opts, compiled, match_results)
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+
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+      ! Process matches
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+      do i = 1, batch%count
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+        if (match_results(i)) then
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+          found_match = .true.
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+          match_count = match_count + 1
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+
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+          ! Handle binary files
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+          if (src%is_binary .and. .not. opts%text_mode) then
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+            if (.not. binary_matched) then
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+              call print_binary_match(src%filename, opts)
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+              binary_matched = .true.
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+            end if
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+            return
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+          end if
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+
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+          ! Handle output modes
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+          if (opts%quiet) then
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+            return
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+          else if (opts%files_with_matches) then
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+            call print_filename(src%filename, opts)
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+            return
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+          else if (.not. opts%count_only) then
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+            ! Get line text and print it
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+            line = src%get_line_text(batch%lines(i))
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+            if (opts%color_mode == COLOR_ALWAYS) then
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+              call find_matches(line, patterns, opts, compiled, match_starts, match_ends, num_matches)
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+              call print_match_colored(line, src%filename, batch%lines(i)%line_num, &
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+                                       batch%lines(i)%byte_off, opts, match_starts, match_ends, num_matches)
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+            else
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+              call print_match(line, src%filename, batch%lines(i)%line_num, &
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+                              batch%lines(i)%byte_off, opts)
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+            end if
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+          end if
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+
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+          ! Check max count
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+          if (opts%max_count > 0 .and. match_count >= opts%max_count) then
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+            if (opts%count_only) then
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+              call print_count(match_count, src%filename, opts)
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+            end if
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+            return
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+          end if
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+        end if
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+      end do
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+    end do
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+
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+    ! Handle count mode
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+    if (opts%count_only) then
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+      call print_count(match_count, src%filename, opts)
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+    end if
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+
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+  end function process_source_batch
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+
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   subroutine find_matches(line, patterns, opts, compiled, match_starts, match_ends, num_matches)
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     !> Find all matches in a line, returning their positions
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     !> For -o mode, this finds all non-overlapping matches
@@ -549,6 +686,12 @@ contains
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     logical :: use_context
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     integer :: k
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+    ! Try optimized batch mode for simple cases
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+    if (present(compiled) .and. compiled%compiled .and. can_use_batch_mode(src, opts)) then
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+      found_match = process_source_batch(src, patterns, opts, compiled)
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+      return
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+    end if
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+
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     found_match = .false.
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     match_count = 0
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     binary_matched = .false.
@@ -564,7 +707,7 @@ contains
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       allocate(before_buffer(opts%before_context))
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     end if
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-    ! Process lines
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+    ! Process lines (line-by-line fallback)
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     do
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       ! Read next line with dynamic allocation (no length limit)
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       if (opts%null_data) then
src/ferp_mmap.f90modified
@@ -10,12 +10,31 @@ module ferp_mmap
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   public :: mmap_file_t
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   public :: mmap_open, mmap_close, mmap_get_line
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+  public :: line_info_t, line_batch_t
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+  public :: BATCH_SIZE
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   ! POSIX constants
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   integer(c_int), parameter :: PROT_READ = 1
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   integer(c_int), parameter :: MAP_PRIVATE = 2
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   integer(c_int), parameter :: MAP_FAILED = -1
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+  ! Batch processing constants
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+  integer, parameter :: BATCH_SIZE = 256  ! Number of lines per batch
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+
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+  !> Line info for batch processing (pointers into mmap'd memory)
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+  type :: line_info_t
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+    integer(c_size_t) :: start_pos = 0    ! Start position in mmap (0-based)
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+    integer(c_size_t) :: length = 0       ! Length of line (excluding newline)
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+    integer :: line_num = 0               ! Line number (1-based)
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+    integer(i64) :: byte_off = 0          ! Byte offset in file
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+  end type line_info_t
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+
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+  !> Batch of line info for bulk processing
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+  type :: line_batch_t
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+    type(line_info_t) :: lines(BATCH_SIZE)
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+    integer :: count = 0                  ! Number of valid lines in batch
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+  end type line_batch_t
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+
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   ! C interfaces
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   interface
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     function c_open(pathname, flags) bind(C, name="open")
@@ -82,6 +101,8 @@ module ferp_mmap
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     procedure :: open => mmap_open_method
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     procedure :: close => mmap_close_method
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     procedure :: read_line => mmap_read_line
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+    procedure :: read_lines_batch => mmap_read_lines_batch
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+    procedure :: get_line_text => mmap_get_line_text
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     procedure :: reset => mmap_reset
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   end type mmap_file_t
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@@ -263,4 +284,103 @@ contains
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   end function mmap_read_line
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+  function mmap_read_lines_batch(this, batch) result(success)
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+    !> Read up to BATCH_SIZE lines from memory-mapped file
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+    !> Returns line positions without copying data (zero-copy batch read)
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+    class(mmap_file_t), intent(inout) :: this
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+    type(line_batch_t), intent(out) :: batch
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+    logical :: success
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+
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+    character(len=1, kind=c_char), pointer :: file_data(:)
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+    integer(c_size_t) :: start_pos, end_pos, line_len
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+    integer(c_int64_t) :: newline_pos
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+    integer :: i
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+
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+    success = .false.
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+    batch%count = 0
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+
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+    if (.not. this%is_open) return
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+    if (this%pos >= this%size) return
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+    if (.not. c_associated(this%data)) return
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+
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+    ! Map the C pointer to a Fortran character array
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+    call c_f_pointer(this%data, file_data, [this%size])
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+
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+    ! Read up to BATCH_SIZE lines
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+    do i = 1, BATCH_SIZE
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+      if (this%pos >= this%size) exit
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+
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+      start_pos = this%pos  ! 0-based position
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+
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+      ! Use SIMD to find newline
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+      newline_pos = simd_find_char_ptr(this%data, int(this%size, c_int64_t), &
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+                                        int(this%pos, c_int64_t), char(10))
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+
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+      if (newline_pos < 0) then
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+        ! No newline found - rest of file is the line
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+        end_pos = this%size
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+      else
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+        end_pos = int(newline_pos, c_size_t)
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+      end if
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+
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+      ! Calculate line length (excluding newline and CR)
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+      line_len = end_pos - start_pos
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+      if (line_len > 0 .and. end_pos > start_pos) then
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+        ! Check for CR before LF (Windows line ending)
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+        if (file_data(end_pos) == char(13)) then
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+          line_len = line_len - 1
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+        end if
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+      end if
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+
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+      ! Store line info
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+      batch%count = batch%count + 1
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+      batch%lines(batch%count)%start_pos = start_pos
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+      batch%lines(batch%count)%length = line_len
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+      this%line_number = this%line_number + 1
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+      batch%lines(batch%count)%line_num = this%line_number
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+      batch%lines(batch%count)%byte_off = int(start_pos, i64)
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+
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+      ! Move past the newline
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+      if (end_pos < this%size) then
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+        this%pos = end_pos + 1  ! Position after newline (0-based)
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+      else
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+        this%pos = this%size
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+      end if
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+      this%byte_offset = int(this%pos, i64)
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+    end do
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+
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+    success = (batch%count > 0)
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+
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+  end function mmap_read_lines_batch
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+
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+  function mmap_get_line_text(this, info) result(line)
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+    !> Extract line text from mmap'd memory given line info
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+    class(mmap_file_t), intent(in) :: this
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+    type(line_info_t), intent(in) :: info
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+    character(len=:), allocatable :: line
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+
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+    character(len=1, kind=c_char), pointer :: file_data(:)
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+    integer :: i
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+
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+    if (.not. this%is_open .or. .not. c_associated(this%data)) then
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+      line = ''
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+      return
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+    end if
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+
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+    if (info%length == 0) then
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+      line = ''
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+      return
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+    end if
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+
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+    ! Map the C pointer to a Fortran character array
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+    call c_f_pointer(this%data, file_data, [this%size])
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+
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+    ! Allocate and copy line (start_pos is 0-based, array is 1-based)
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+    allocate(character(len=info%length) :: line)
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+    do i = 1, int(info%length)
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+      line(i:i) = file_data(info%start_pos + i)
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+    end do
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+
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+  end function mmap_get_line_text
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+
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 end module ferp_mmap