# vmm ## Command Function This command is used to query the virtual memory used by a process. ## Syntax - vmm \[_-a / -h / --help_\] - vmm \[_pid_\] ## Parameters **Table 1** Parameter description

Parameter	Description	Value Range
-a	Displays the virtual memory usage of all processes.	N/A
-h \| --help	Displays help information.	N/A
pid	Specifies the ID of the process to query.	[0,63]

## Usage By default, this command displays the virtual memory usage of all processes. ## Example Run **vmm 3**. ## Output Virtual memory usage of process 3: ``` OHOS # vmm 3 PID aspace name base size pages ---- ------ ---- ---- ----- ---- 3 0x408c0118 foundation 0x01000000 0x3e000000 800 region name base size mmu_flags pages pg/ref ------ ---- ---- ---- --------- ----- ----- 0x408cb364 /bin/foundation 0x06da3000 0x00001000 CH US RD 1 1 0x408cb80c /bin/foundation 0x06da4000 0x00001000 CH US RD EX 1 1 0x408cb720 /bin/foundation 0x06da5000 0x00001000 CH US RD 1 1 0x408cb9a8 /bin/foundation 0x06da6000 0x00001000 CH US RD WR 1 1 0x413efde4 HEAP 0x12b43000 0x00015000 CH US RD WR 19 19 0x408c3d34 /lib/libc.so 0x23b08000 0x0004a000 CH US RD 25 2 0x408cbd44 /lib/libc.so 0x23b52000 0x00068000 CH US RD EX 58 10 0x408c3dc0 /lib/libc.so 0x23bba000 0x00002000 CH US RD WR 2 2 0x408cc128 /lib/libc.so 0x23bbc000 0x00002000 CH US RD WR 2 2 0x408d1634 MMAP 0x23bbe000 0x00005000 CH US RD WR 5 5 0x408c4e10 VDSO 0x23bc3000 0x00002000 CH US RD EX 2 2 0x408dbaec /lib/libc++.so 0x23bc5000 0x00046000 CH US RD 51 5 0x408deba8 /lib/libc++.so 0x23c0b000 0x0009f000 CH US RD EX 29 10 0x408debf4 /lib/libc++.so 0x23caa000 0x00006000 CH US RD 6 6 0x408c3ce0 /lib/libc++.so 0x23cb0000 0x00001000 CH US RD WR 1 1 ``` **Table 2** Basic process information

Parameter	Description
PID	Process ID
aspace	Address of the virtual memory control block
name	Process name
base	Start address of the virtual memory
size	Size of virtual memory
pages	Number of used physical pages

**Table 3** Virtual memory region information

Parameter	Description
region	Address of the control block in the virtual memory region
name	Name of the virtual memory region
base	Start address of the virtual memory region
size	Size of the virtual memory region
mmu_flags	MMU mapping attribute of the virtual memory region
pages	Number of used physical pages, including that of the shared memory
pg/ref	Number of used physical pages