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    <p>To explain your own answer: This is not objective-C code, but plain old C, using the Mach APIs in order to obtain statistics from the kernel. Mach APIs are low level APIs exported by XNU, which is a hybrid kernel composed of the top layer (which exports BSD APIs, like the usual system calls we know and love from UN*X), and the bottom layer- which is Mach. The code uses the Mach "host" abstraction which (among other things) provides statistics about OS level utilization of resources.</p> <p>Specifically, here's a full annotation:</p> <pre><code>#import &lt;mach/mach.h&gt; // Required for generic Mach typedefs, like the mach_port_t #import &lt;mach/mach_host.h&gt; // Required for the host abstraction APIs. extern "C" // C, rather than objective-c { const int HWUtils_getFreeMemory() { mach_port_t host_port; mach_msg_type_number_t host_size; vm_size_t pagesize; // First, get a reference to the host port. Any task can do that, and this // requires no privileges host_port = mach_host_self(); host_size = sizeof(vm_statistics_data_t) / sizeof(integer_t); // Get host page size - usually 4K host_page_size(host_port, &amp;pagesize); vm_statistics_data_t vm_stat; // Call host_statistics, requesting VM information. if (host_statistics(host_port, // As obtained from mach_host_self() HOST_VM_INFO, // Flavor - many more in &lt;mach/host_info.h&gt;(host_info_t)&amp;vm_stat, // OUT - this will be populated &amp;host_size) // in/out - sizeof(vm_stat). != KERN_SUCCESS) NSLog(@"Failed to fetch vm statistics"); // log error /* Stats in bytes */ // Calculating total and used just to show all available functionality // This part is basic math. Counts are all in pages, so multiply by pagesize // Memory used is sum of active pages, (resident, used) // inactive, (resident, but not recently used) // and wired (locked in memory, e.g. kernel) natural_t mem_used = (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count) * pagesize; natural_t mem_free = vm_stat.free_count * pagesize; natural_t mem_total = mem_used + mem_free; NSLog(@"used: %u free: %u total: %u", mem_used, mem_free, mem_total); return (int) mem_free; } </code></pre>
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    1. POHow can I get amount of "free" memory in Unity3d on iOS?
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    1. COThanks for the explanation!
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    2. CODoes this take in account memory used by gpu?
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