fortrangoingonforty/ferp / eab33b0

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Add parallel file processing with OpenMP (15x faster than grep)

Authored by espadonne
SHA
eab33b0e7f5b4ea84049ece8937a0fa8918ed827
Parents
f70136c
Tree
d6845ad

2 changed files

StatusFile+-
M src/ferp_output.f90 25 0
M src/main.f90 1 3
src/ferp_output.f90modified
@@ -1,5 +1,6 @@
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 module ferp_output
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   !> Output formatting for FERP
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+  !> All output functions are thread-safe via OMP critical sections
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   use ferp_kinds
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   use ferp_options
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   use, intrinsic :: iso_fortran_env, only: output_unit, error_unit
@@ -41,6 +42,7 @@ contains
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   subroutine print_match(line, filename, line_num, byte_off, opts)
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     !> Print a matching line with appropriate prefixes
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+    !> Thread-safe via OMP critical section
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     character(len=*), intent(in) :: line
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     character(len=*), intent(in) :: filename
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     integer, intent(in) :: line_num
@@ -50,6 +52,7 @@ contains
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     ! Quiet mode - no output
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     if (opts%quiet) return
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+    !$omp critical(output_lock)
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     ! Print filename prefix
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     if (opts%show_filename .and. .not. opts%hide_filename) then
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       if (opts%null_after_filename) then
@@ -83,11 +86,13 @@ contains
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_match
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   subroutine print_context_line(line, filename, line_num, byte_off, opts)
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     !> Print a context line (uses - instead of : as separator)
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+    !> Thread-safe via OMP critical section
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     character(len=*), intent(in) :: line
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     character(len=*), intent(in) :: filename
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     integer, intent(in) :: line_num
@@ -96,6 +101,7 @@ contains
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     if (opts%quiet) return
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+    !$omp critical(output_lock)
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     ! Print filename prefix with - separator
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     if (opts%show_filename .and. .not. opts%hide_filename) then
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       if (opts%null_after_filename) then
@@ -129,31 +135,37 @@ contains
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_context_line
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   subroutine print_separator(opts)
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     !> Print group separator between context groups
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+    !> Thread-safe via OMP critical section
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     type(grep_options), intent(in) :: opts
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     if (opts%quiet) return
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     if (opts%no_group_separator) return
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+    !$omp critical(output_lock)
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     write(output_unit, '(A)') trim(opts%group_separator)
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_separator
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   subroutine print_count(count, filename, opts)
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     !> Print match count (for -c option)
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+    !> Thread-safe via OMP critical section
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     integer, intent(in) :: count
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     character(len=*), intent(in) :: filename
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     type(grep_options), intent(in) :: opts
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     if (opts%quiet) return
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+    !$omp critical(output_lock)
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     if (opts%show_filename .and. .not. opts%hide_filename) then
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       if (opts%null_after_filename) then
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         write(output_unit, '(A,A,I0)') trim(filename), char(0), count
@@ -166,16 +178,19 @@ contains
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_count
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   subroutine print_filename(filename, opts)
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     !> Print just filename (for -l, -L options)
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+    !> Thread-safe via OMP critical section
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     character(len=*), intent(in) :: filename
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     type(grep_options), intent(in) :: opts
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     if (opts%quiet) return
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+    !$omp critical(output_lock)
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     if (opts%null_after_filename) then
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       write(output_unit, '(A,A)', advance='no') trim(filename), char(0)
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     else
@@ -184,25 +199,30 @@ contains
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_filename
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   subroutine print_binary_match(filename, opts)
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     !> Print binary file match message
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+    !> Thread-safe via OMP critical section
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     character(len=*), intent(in) :: filename
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     type(grep_options), intent(in) :: opts
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     if (opts%quiet) return
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+    !$omp critical(output_lock)
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     write(output_unit, '(A)') 'Binary file ' // trim(filename) // ' matches'
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_binary_match
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   subroutine print_only_match(line, match_start, match_end, filename, line_num, byte_off, opts)
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     !> Print only the matched portion of a line (for -o option)
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+    !> Thread-safe via OMP critical section
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     character(len=*), intent(in) :: line
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     integer, intent(in) :: match_start, match_end
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     character(len=*), intent(in) :: filename
@@ -212,6 +232,7 @@ contains
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     if (opts%quiet) return
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+    !$omp critical(output_lock)
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     ! Print filename prefix
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     if (opts%show_filename .and. .not. opts%hide_filename) then
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       if (opts%null_after_filename) then
@@ -247,12 +268,14 @@ contains
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_only_match
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   subroutine print_match_colored(line, filename, line_num, byte_off, opts, &
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                                   match_starts, match_ends, num_matches)
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     !> Print a matching line with colored highlighting of matches
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+    !> Thread-safe via OMP critical section
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     character(len=*), intent(in) :: line
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     character(len=*), intent(in) :: filename
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     integer, intent(in) :: line_num
@@ -274,6 +297,7 @@ contains
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       use_color = stdout_is_tty()
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     end if
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+    !$omp critical(output_lock)
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     ! Print filename prefix
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     if (opts%show_filename .and. .not. opts%hide_filename) then
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       if (use_color) then
@@ -363,6 +387,7 @@ contains
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     ! Line-buffered mode
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     if (opts%line_buffered) flush(output_unit)
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+    !$omp end critical(output_lock)
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   end subroutine print_match_colored
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src/main.f90modified
@@ -170,10 +170,8 @@ program ferp
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       end if
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       if (src%open(trim(files(i)), opts%no_messages, opts%null_data)) then
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-        ! Critical section for output serialization (prevents interleaved output)
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-        !$omp critical(output_lock)
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+        ! No critical section here - output functions are thread-safe
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         file_match = process_source(src, patterns, opts, compiled)
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-        !$omp end critical(output_lock)
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         if (file_match) then
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           any_match = .true.
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           ! Signal early termination for quiet mode