Total RAM size of an iOS device

Question

Is it possible to determine actual RAM size of an iOS device?

Referring to this question Determining the available amount of RAM on an iOS device we can determine the available free memory but how to get the actual total size.

Woodstock · Accepted Answer · 2019-09-17T13:36:02.113

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The simplest solution to find total RAM in a device is to use NSProcessInfo:

Objective C:

[NSProcessInfo processInfo].physicalMemory

Swift 3:

NSProcessInfo.processInfo().physicalMemory

Swift 5:

ProcessInfo.processInfo.physicalMemory

Note: physicalMemory gives us the information at bytes, to calculate GB, divide by the constant 1073741824.

As documented here.

edited Sep 17 '19 at 13:36

answered Nov 26 '13 at 08:20

Woodstock

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@Woodstock how to convert into GB [NSProcessInfo processInfo].physicalMemory / (1024.0 * 1024.0 * 1024.0)]; , this returns around 16 GB for simualator in ios6s ,and expected is around 2GB – Srishti Roy Sep 17 '19 at 11:35
@SrishtiRoy yes, it returns in bytes, on my 16GB MacBook Pro I get: 17179869184 bytes, which I divide by 1073741824, to convert bytes to gigabytes and get 16. – Woodstock Sep 17 '19 at 13:35
@Woodstock yes similar here ,is it because i am using simulator in xcode – Srishti Roy Sep 17 '19 at 13:46
@SrishtiRoy yes, it will show the RAM of your host machine. – Woodstock Sep 18 '19 at 07:56
Are these 8bit bytes? – Confused Sep 15 '21 at 09:39
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@confused yes, always 8bits in a byte these days. – Woodstock Sep 15 '21 at 11:51
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Cheers. Progress... stopped, seemingly in 1984. I'd like to bite more bits. Like a MegaDrive. – Confused Sep 15 '21 at 12:56
Interesting: just ran this on my new 14 Pro Max: 5. So does that mean Apple carves out 1GB that apps can't touch? – user3741598 Dec 30 '22 at 17:23

score 2 · Answer 2 · answered Oct 14 '16 at 03:44

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Slight change for Swift 3: ProcessInfo.processInfo.physicalMemory

answered Oct 14 '16 at 03:44

Swindler

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score 1 · Answer 3 · answered Oct 29 '15 at 09:46

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Following code is to get memory in GB

// For getting size in GB

     [NSProcessInfo processInfo].physicalMemory / (1024.0 * 1024.0 * 1024.0)];

// Swift Version

      NSProcessInfo.processInfo().physicalMemory/(1024.0 * 1024.0 * 1024.0)

answered Oct 29 '15 at 09:46

s Hetul

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score 0 · Answer 4 · edited May 23 '17 at 12:09

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The answer is right there in the top answer of the question you linked:

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);

edited May 23 '17 at 12:09

Community

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answered Nov 26 '13 at 08:19

Enrico Susatyo

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mem_total value is not same always – Sohaib Nov 26 '13 at 08:21
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Yeah, I think John's solution is much better. – Enrico Susatyo Nov 26 '13 at 08:25

Total RAM size of an iOS device

4 Answers4