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--- a/src/System.cpp
+++ b/src/System.cpp
@@ -223,11 +223,13 @@ void System::GetHardware(
#endif
#ifdef __linux__
- // The code for linux was suggested by Antony Lee.
- FILE * fifo = popen(
- "free -k | tail -n+3 | head -n1 | awk '{print $NF}'", "r");
- int ignore = fscanf(fifo, "%llu", &kilobytesFree);
- fclose(fifo);
+ // Use half of the physical memory
+ long pages = sysconf (_SC_PHYS_PAGES);
+ long pagesize = sysconf (_SC_PAGESIZE);
+ if (pages > 0 && pagesize > 0)
+ kilobytesFree = static_cast<unsigned long long>(pages * pagesize / 1024 / 2);
+ else
+ kilobytesFree = 1024 * 1024; // guess 1GB
ncores = sysconf(_SC_NPROCESSORS_ONLN);
return;
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