无法查看 gprof 探查器的完整输出

Question

尽管编译我的代码时设置了 -pg 标志，但我无法查看来自 gmon.out

的 gprof 输出的完整详细信息

具体来说，我没有得到 calls、self Ts/call 和 total Ts/call 的详细信息。

这是 gprof deepflow-static gmon.out 的输出：

Flat profile:

Each sample counts as 0.01 seconds.
  %   cumulative   self              self     total           
 time   seconds   seconds    calls  Ts/call  Ts/call  name    
 52.72      7.18     7.18                             sor_coupled
 34.07     11.82     4.64                             compute_data_and_match
  2.28     12.13     0.31                             convolve_vert
  2.28     12.44     0.31                             compute_smoothness
  2.06     12.72     0.28                             convolve_horiz
  1.47     12.92     0.20                             color_image_resize_vert
  1.03     13.06     0.14                             sub_laplacian
  0.88     13.18     0.12                             image_resize_vert
  0.88     13.30     0.12                             image_warp
  0.73     13.40     0.10                             color_image_resize_horiz
  0.59     13.48     0.08                             image_resize_horiz
  0.18     13.51     0.03                             frexp
  0.15     13.53     0.02                             compute_one_level
  0.15     13.55     0.02                             fwrite
  0.15     13.57     0.02                             memcpy
  0.11     13.58     0.02                             __floorf_sse41
  0.07     13.59     0.01                             brk
  0.07     13.60     0.01                             color_image_png_load
  0.07     13.61     0.01                             get_derivatives
  0.07     13.62     0.01                             png_read_filter_row_paeth_multibyte_pixel

 %         the percentage of the total running time of the
time       program used by this function.

cumulative a running sum of the number of seconds accounted
 seconds   for by this function and those listed above it.

 self      the number of seconds accounted for by this
seconds    function alone.  This is the major sort for this
           listing.

calls      the number of times this function was invoked, if
           this function is profiled, else blank.

 self      the average number of milliseconds spent in this
ms/call    function per call, if this function is profiled,
       else blank.

 total     the average number of milliseconds spent in this
ms/call    function and its descendents per call, if this 
       function is profiled, else blank.

name       the name of the function.  This is the minor sort
           for this listing. The index shows the location of
       the function in the gprof listing. If the index is
       in parenthesis it shows where it would appear in
       the gprof listing if it were to be printed.


Copyright (C) 2012 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.

这是我的 Makefile :

CC=gcc
CFLAGS=-Wall -g -O3
LDFLAGS=-g -Wall -O3
LIBFLAGS=-lm -ljpeg -lpng -pg
LIBAFLAGS=-static /usr/lib/x86_64-linux-gnu/libjpeg.a /usr/local/lib/libpng16.a /usr/lib/x86_64-linux-gnu/libz.a /usr/lib/x86_64-linux-gnu/libm.a

all: deepflow-static

deepflow: deepflow.o image.o io.o opticalflow_aux.o opticalflow.o solver.o
$(CC) $(LDFLAGS) $(LIBFLAGS) -o $@ $^

deepflow-static: deepflow.o image.o io.o opticalflow_aux.o opticalflow.o solver.o
$(CC) $(LIBFLAGS) -o $@ $^ $(LIBAFLAGS)

%.o: %.c
$(CC) -o $@ $(CFLAGS) -c $+ 

clean:
rm -f *.o deepflow

请帮助我找出缺少的内容。提前致谢

Answer 1

当运行使用 gprof 的应用程序没有成功终止时，我就遇到过这种情况。

分析文件的生成无法完成，因为信息没有完全写入 gmon.out。

尝试在几行后退出程序：

        exit(EXIT_SUCCESS);

并检查文件是否正确生成。

您也可以运行通过 gdb 的程序。

我不是 Makefile 专家，但您应该在两个步骤中使用 -pg 标志：

GPROF=-pg

all: $(SOURCES) $(EXECUTABLE)

$(EXECUTABLE): $(OBJECTS) 
    $(CC) $(LDFLAGS) $(OBJECTS) -o $@ $(LIBS) $(GPROF)

.cpp.o:
    $(CC) $(CPPFLAGS) $(CFLAGS) $< -o $@ $(GPROF)

无法查看 gprof 探查器的完整输出

Unable to view complete output from gprof profiler

profiler

gprof