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Increase number of allowed open files on Mac

- Increase from default 256 to 4096-to-8192 range, or OPEN_MAX for process
- From code provided by Larry Biehl, Purdue University, USA, from 'MultiSpec' project
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dakcarto committed Oct 31, 2013
1 parent 247e6c7 commit d8e5c2f8300cdbd31f71544a402f360cac12016d
Showing with 38 additions and 0 deletions.
  1. +38 −0 src/app/main.cpp
@@ -68,6 +68,9 @@ int _fmode = _O_BINARY;
#if MAC_OS_X_VERSION_MAX_ALLOWED < 1050
typedef SInt32 SRefCon;
#endif
// For setting the maximum open files limit higher
#include <sys/resource.h>
#include <limits.h>
#endif

#include "qgisapp.h"
@@ -359,6 +362,41 @@ void myMessageOutput( QtMsgType type, const char *msg )

int main( int argc, char *argv[] )
{
#ifdef Q_OS_MACX
// Increase file resource limits (i.e., number of allowed open files)
// (from code provided by Larry Biehl, Purdue University, USA, from 'MultiSpec' project)
// This is generally 256 for the soft limit on Mac
// NOTE: setrlimit() must come *before* initialization of stdio strings,
// e.g. before any debug messages, or setrlimit() gets ignored
// see: http://stackoverflow.com/a/17726104/2865523
struct rlimit rescLimit;
if ( getrlimit( RLIMIT_NOFILE, &rescLimit ) == 0 )
{
rlim_t oldSoft( rescLimit.rlim_cur );
rlim_t oldHard( rescLimit.rlim_max );
#ifdef OPEN_MAX
rlim_t newSoft( OPEN_MAX );
rlim_t newHard( std::min( oldHard, newSoft ) );
#else
rlim_t newSoft( 4096 );
rlim_t newHard( std::min(( rlim_t )8192, oldHard ) );
#endif
if ( rescLimit.rlim_cur < newSoft )
{
rescLimit.rlim_cur = newSoft;
rescLimit.rlim_max = newHard;

if ( setrlimit( RLIMIT_NOFILE, &rescLimit ) == 0 )
{
QgsDebugMsg( QString( "Mac RLIMIT_NOFILE Soft/Hard NEW: %1 / %2" )
.arg( rescLimit.rlim_cur ).arg( rescLimit.rlim_max ) );
}
}
QgsDebugMsg( QString( "Mac RLIMIT_NOFILE Soft/Hard ORIG: %1 / %2" )
.arg( oldSoft ).arg( oldHard ) );
}
#endif

QgsDebugMsg( QString( "Starting qgis main" ) );
#ifdef WIN32 // Windows
#ifdef _MSC_VER

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