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# zx_system_get_physmem

## Summary

Get amount of physical memory on the system.

## Declaration

```c
#include <zircon/syscalls.h>

uint64_t zx_system_get_physmem(void);
```

## Description

`zx_system_get_physmem()` returns the total size of physical memory on
the machine, in bytes.

## Rights

TODO(https://fxbug.dev/42107318)

## Return value

`zx_system_get_physmem()` returns a number in bytes.

## Errors

`zx_system_get_physmem()` cannot fail.

## Notes

Currently the total size of physical memory cannot change during a run of
the system, only at boot time.  This might change in the future.

## See also

 - [`zx_system_get_num_cpus()`]

[`zx_system_get_num_cpus()`]: system_get_num_cpus.md