Back to index

salome-smesh  6.5.0
SMDS_MemoryLimit.cxx
Go to the documentation of this file.
00001 // Copyright (C) 2007-2012  CEA/DEN, EDF R&D, OPEN CASCADE
00002 //
00003 // This library is free software; you can redistribute it and/or
00004 // modify it under the terms of the GNU Lesser General Public
00005 // License as published by the Free Software Foundation; either
00006 // version 2.1 of the License.
00007 //
00008 // This library is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011 // Lesser General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU Lesser General Public
00014 // License along with this library; if not, write to the Free Software
00015 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
00016 //
00017 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
00018 //
00019 
00020 // File      : SMDS_MemoryLimit.cxx
00021 // Created   : Fri Sep 21 17:16:42 2007
00022 // Author    : Edward AGAPOV (eap)
00023 // Executable to find out a lower RAM limit (MB), i.e. at what size of freeRAM
00024 // reported by sysinfo, no more memory can be allocated.
00025 // This is not done inside a function of SALOME because allocated memory is not returned
00026 // to the system. (PAL16631)
00027 //
00028 #ifndef WIN32
00029 #include <sys/sysinfo.h>
00030 #endif
00031 
00032 #ifdef _DEBUG_
00033 #include <iostream>
00034 #endif
00035 
00036 int main (int argc, char ** argv)
00037 {
00038   // To better understand what is going on here, consult bug [SALOME platform 0019911]
00039 #ifndef WIN32
00040   struct sysinfo si;
00041   int err = sysinfo( &si );
00042   if ( err )
00043     return -1;
00044   unsigned long freeRamKb = ( si.freeram  * si.mem_unit ) / 1024;
00045 
00046   // totat RAM size in Gb, float is in order not to have 1 instead of 1.9
00047   float totalramGb = float( si.totalram * si.mem_unit ) / 1024 / 1024 / 1024;
00048 
00049   // nb Kbites to allocate at one step. Small nb leads to hung up
00050   const int stepKb = int( 5 * totalramGb );
00051 
00052   unsigned long nbSteps = freeRamKb / stepKb * 2;
00053   try {
00054     while ( nbSteps-- ) {
00055       new char[stepKb*1024];
00056       err = sysinfo( &si );
00057       if ( !err )
00058         freeRamKb = ( si.freeram  * si.mem_unit ) / 1024;
00059     }
00060   } catch (...) {}
00061 
00062 // #ifdef _DEBUG_
00063 //   std::cout << freeRamKb / 1024 << std::endl;
00064 // #endif
00065   return freeRamKb / 1024;
00066 
00067 #endif
00068 
00069   return -1;
00070 }