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opj_decompress: use clock_gettime() instead of getrusage() so as to get the time spent, and not to the total CPU time

This commit is contained in:
Even Rouault 2016-05-25 21:39:21 +02:00
parent d67cd2220a
commit 69497d35c0
2 changed files with 18 additions and 9 deletions
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3
src/bin/jp2/CMakeLists.txt
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@ -57,6 +57,9 @@ foreach(exe opj_decompress opj_compress opj_dump)
# On unix you need to link to the math library:
if(UNIX)
target_link_libraries(${exe} m)
IF("${CMAKE_SYSTEM_NAME}" MATCHES "Linux")
target_link_libraries(${exe} rt)
endif()
endif()
# Install exe
install(TARGETS ${exe}

24
src/bin/jp2/opj_decompress.c
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@ -43,6 +43,7 @@
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#ifdef _WIN32
#include "windirent.h"
@ -907,17 +908,22 @@ OPJ_FLOAT64 opj_clock(void) {
/* t is the high resolution performance counter (see MSDN) */
QueryPerformanceCounter ( & t ) ;
return freq.QuadPart ? (t.QuadPart / (OPJ_FLOAT64)freq.QuadPart) : 0;
#elif defined(__linux)
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
return( ts.tv_sec + ts.tv_nsec * 1e-9 );
#else
/* Unix or Linux: use resource usage */
struct rusage t;
OPJ_FLOAT64 procTime;
/* (1) Get the rusage data structure at this moment (man getrusage) */
getrusage(0,&t);
/* (2) What is the elapsed time ? - CPU time = User time + System time */
/* Unix : use resource usage */
/* FIXME: this counts the total CPU time, instead of the user perceived time */
struct rusage t;
OPJ_FLOAT64 procTime;
/* (1) Get the rusage data structure at this moment (man getrusage) */
getrusage(0,&t);
/* (2) What is the elapsed time ? - CPU time = User time + System time */
/* (2a) Get the seconds */
procTime = (OPJ_FLOAT64)(t.ru_utime.tv_sec + t.ru_stime.tv_sec);
/* (2b) More precisely! Get the microseconds part ! */
return ( procTime + (OPJ_FLOAT64)(t.ru_utime.tv_usec + t.ru_stime.tv_usec) * 1e-6 ) ;
procTime = (OPJ_FLOAT64)(t.ru_utime.tv_sec + t.ru_stime.tv_sec);
/* (2b) More precisely! Get the microseconds part ! */
return ( procTime + (OPJ_FLOAT64)(t.ru_utime.tv_usec + t.ru_stime.tv_usec) * 1e-6 ) ;
#endif
}