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    <p>Here's some code I wrote to try to do this in a portable way. It's not perfect, but I think it should at least give a pointer to how to do this on each of several platforms.</p> <p>(P.S. I use OSX and Linux regularly, and know this works well. I use Windows more rarely, so caveats apply to the Windows clause, but I think it's right.)</p> <pre><code>#ifdef __linux__ # include &lt;sys/sysinfo.h&gt; #endif #ifdef __APPLE__ # include &lt;mach/task.h&gt; # include &lt;mach/mach_init.h&gt; #endif #ifdef _WINDOWS # include &lt;windows.h&gt; #else # include &lt;sys/resource.h&gt; #endif /// The amount of memory currently being used by this process, in bytes. /// By default, returns the full virtual arena, but if resident=true, /// it will report just the resident set in RAM (if supported on that OS). size_t memory_used (bool resident=false) { #if defined(__linux__) // Ugh, getrusage doesn't work well on Linux. Try grabbing info // directly from the /proc pseudo-filesystem. Reading from // /proc/self/statm gives info on your own process, as one line of // numbers that are: virtual mem program size, resident set size, // shared pages, text/code, data/stack, library, dirty pages. The // mem sizes should all be multiplied by the page size. size_t size = 0; FILE *file = fopen("/proc/self/statm", "r"); if (file) { unsigned long vm = 0; fscanf (file, "%ul", &amp;vm); // Just need the first num: vm size fclose (file); size = (size_t)vm * getpagesize(); } return size; #elif defined(__APPLE__) // Inspired by: // http://miknight.blogspot.com/2005/11/resident-set-size-in-mac-os-x.html struct task_basic_info t_info; mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT; task_info(current_task(), TASK_BASIC_INFO, (task_info_t)&amp;t_info, &amp;t_info_count); size_t size = (resident ? t_info.resident_size : t_info.virtual_size); return size; #elif defined(_WINDOWS) // According to MSDN... PROCESS_MEMORY_COUNTERS counters; if (GetProcessMemoryInfo (GetCurrentProcess(), &amp;counters, sizeof (counters))) return counters.PagefileUsage; else return 0; #else // No idea what platform this is return 0; // Punt #endif } </code></pre>
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    1. POHow do I programmatically check memory use in a fairly portable way? (C/C++)
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    1. UStimrau
    1. USLarry Gritz
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    1. COLooks like a good answer to me :)
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      1. USAndrew Rollings
    2. COYou have a stray #endif on the line before #elif defined(__APPLE__).
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      1. USJudge Maygarden
    3. COAlso, the first #else only applies to #ifdef _WINDOWS...
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      1. USJudge Maygarden
 

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