Display the virtual memory regions allocated in a process.
- Get only the summary
$ vmmap --summary MemgraphName.memgraph
OUTPUT:
VIRTUAL RESIDENT DIRTY SWAPPED VOLATILE NONVOL EMPTY REGION
REGION TYPE SIZE SIZE SIZE SIZE SIZE SIZE SIZE COUNT (non-coalesced)
=========== ======= ======== ===== ======= ======== ====== ===== =======
Activity Tracing 256K 32K 32K 0K 0K 32K 0K 1
Dispatch continuations 2048K 64K 64K 0K 0K 0K 0K 1
Foundation 16K 16K 16K 0K 0K 0K 0K 1
Kernel Alloc Once 32K 16K 16K 0K 0K 0K 0K 1
MALLOC guard page 128K 0K 0K 0K 0K 0K 0K 8
MALLOC metadata 144K 144K 144K 0K 0K 0K 0K 9
MALLOC_LARGE 1184K 1040K 1040K 0K 0K 0K 0K 43 see MALLOC ZONE table below
MALLOC_LARGE metadata 16K 16K 16K 0K 0K 0K 0K 1 see MALLOC ZONE table below
MALLOC_SMALL 16.0M 1008K 1008K 0K 0K 0K 0K 2 see MALLOC ZONE table below
MALLOC_TINY 4096K 1600K 1600K 0K 0K 0K 0K 4 see MALLOC ZONE table below
SQLite page cache 576K 288K 288K 0K 256K 32K 0K 9
STACK GUARD 256K 0K 0K 0K 0K 0K 0K 16
Skywalk Networking 4864K 224K 224K 0K 0K 224K 0K 18
Stack 9184K 544K 496K 0K 0K 0K 0K 17
Stack (reserved) 1088K 0K 0K 0K 0K 0K 0K 2 reserved VM address space (unallocated)
Stack Guard 32K 0K 0K 0K 0K 0K 0K 2
VM_ALLOCATE 1.0G 2064K 2064K 0K 0K 0K 0K 11
VM_ALLOCATE (reserved) 16K 0K 0K 0K 0K 0K 0K 1 reserved VM address space (unallocated)
__DATA 11.4M 7705K 2024K 0K 0K 0K 0K 408
__DATA_CONST 31.1M 25.1M 37K 0K 0K 0K 0K 404
__DATA_DIRTY 1271K 1095K 561K 0K 0K 0K 0K 322
__FONT_DATA 4K 0K 0K 0K 0K 0K 0K 1
__LINKEDIT 197.0M 6880K 0K 0K 0K 0K 0K 21
__LLVM 61.3M 0K 0K 0K 0K 0K 0K 16
__LLVM_COV 96K 0K 0K 0K 0K 0K 0K 5
__OBJC_RO 90.5M 38.0M 0K 0K 0K 0K 0K 1
__OBJC_RW 3392K 2112K 16K 0K 0K 0K 0K 1
__TEXT 374.0M 118.9M 80K 0K 0K 0K 0K 435
__UNICODE 588K 544K 0K 0K 0K 0K 0K 1
dyld private memory 1024K 32K 32K 0K 0K 0K 0K 1
libnetwork 1152K 48K 48K 0K 0K 48K 1008K 16
mapped file 28.8M 1952K 80K 0K 0K 0K 0K 7
shared memory 48K 48K 48K 0K 0K 0K 0K 3
unused but dirty shlib __DATA 194K 194K 194K 0K 0K 0K 0K 70
=========== ======= ======== ===== ======= ======== ====== ===== =======
TOTAL 1.8G 209.1M 9.9M 0K 256K 336K 1008K 1859
TOTAL, minus reserved VM space 1.8G 209.1M 9.9M 0K 256K 336K 1008K 1859
VIRTUAL RESIDENT DIRTY SWAPPED ALLOCATION BYTES DIRTY+SWAP REGION
MALLOC ZONE SIZE SIZE SIZE SIZE COUNT ALLOCATED FRAG SIZE % FRAG COUNT
=========== ======= ========= ========= ========= ========= ========= ========= ====== ======
DefaultMallocZone_0x1010b8000 19.2M 3600K 3600K 0K 16145 3430K 170K 5% 48
NWMallocZone_0x109aa4000 2048K 64K 64K 0K 39 5K 59K 93% 2
=========== ======= ========= ========= ========= ========= ========= ========= ====== ======
TOTAL 21.2M 3664K 3664K 0K 16184 3434K 230K 7% 50- Get memory regions occupied by MALLOC_LARGE:
vmmap QNetworkExtension\[1420\].memgraph | grep 'MALLOC_LARGE'
OUTPUT:
REGION TYPE START - END [ VSIZE RSDNT DIRTY SWAP] PRT/MAX SHRMOD PURGE REGION DETAIL
MALLOC_LARGE 106360000-106368000 [ 32K 32K 32K 0K] rw-/rwx SM=PRV DefaultMallocZone_0x1010b8000
MALLOC_LARGE metadata 106368000-10636c000 [ 16K 16K 16K 0K] rw-/rwx SM=PRV DefaultMallocZone_0x1010b8000
MALLOC_LARGE 10636c000-106374000 [ 32K 32K 32K 0K] rw-/rwx SM=PRV DefaultMallocZone_0x1010b8000
MALLOC_LARGE 106374000-106378000 [ 16K 16K 16K 0K] rw-/rwx SM=PRV DefaultMallocZone_0x1010b8000
List all the malloc-allocated buffers in the process's heap
- Get diff objects allocated between memory graph and sort them by size:
heap --sortBySize --diffFrom=Memgraph-pre.memgraph Memgraph-post.memgraph
OUTPUT:
Hardware Model: iPhone9,3
Process: *****
Path: *****
Load Address: 0x100cb4000
Identifier: *****
Version: ???
Code Type: ARM64
Platform: iOS
Parent Process: debugserver [1424]
Date/Time: 2022-01-18 10:04:31.765 +0100
Launch Time: 2022-01-18 10:02:49.346 +0100
OS Version: iPhone OS 15.0 (19A346)
Report Version: 104
Physical footprint: 17.1M
Physical footprint (peak): 17.9M
----
Only showing allocations in Memgraph-post.memgraph that are not in Memgraph-pre.memgraph.
Process 1420: 2 zones
All zones: 41590 nodes malloced - Sizes: 112KB[1] 80KB[4] 32KB[75] 16KB[6] 15KB[1] 6.5KB[2] 5.5KB[2] 5KB[2] 4KB[57] 3.5KB[3] 2.5KB[27] 2KB[149] 1.5KB[33] 1KB[6] 1008[3] 992[2] 928[2] 912[3] 896[11] 880[3] 864[4] 848[427] 800[1] 784[3] 768[26] 752[3] 736[11] 720[4] 704[2] 672[19] 640[71] 624[2] 608[40] 592[2] 576[1] 560[5] 544[12] 528[44] 512[13] 480[9] 464[74] 448[25] 432[10] 416[33] 400[39] 384[91] 368[162] 352[51] 336[58] 320[35] 304[15] 288[69] 272[211] 256[422] 240[69] 224[308] 208[142] 192[232] 176[459] 160[789] 144[444] 128[949] 112[849] 96[4111] 80[1372] 64[5734] 48[13317] 32[7575] 16[2854]
Found 101 ObjC classes
Found 28 Swift classes
Found 11 CFTypes
-----------------------------------------------------------------------
All zones: 41590 nodes (7136320 bytes)
COUNT BYTES AVG CLASS_NAME TYPE BINARY
===== ===== === ========== ==== ======
7116 3636464 511.0 non-object
13260 723168 54.5 Swift closure context Swift <unknown>
553 622544 1125.8 _DictionaryStorage<String, Any> Swift libswiftCore.dylib
4411 564448 128.0 CFString ObjC CoreFoundation
1674 311264 185.9 __StringStorage Swift libswiftCore.dylib
2709 173376 64.0 _ContiguousArrayStorage<String> Swift libswiftCore.dylib
3263 156624 48.0 __NSMallocBlock__ ObjC libsystem_blocks.dylib
2 115280 57640.0 NSConcreteMutableData (Bytes Storage) C Foundation
6 98304 16384.0 Swift Metadata C libswiftCore.dylib
........- Another example is we want to check all allocated object that takes more than 1k:
heap --addresses=non-object\[1k-\] Memgraph.memgraph
- For example we want to see the incrementation in bytes of a specifyc target:
heap --diffFrom=Memgraph-pre.memgraph Memgraph-post.memgraph | grep 'MyFramework' | awk '{sum+=$2;} END {print "Total size: " sum " bytes";}'
OUTPUT:
Total size: 53088 bytes
Search a process's memory for unreferenced malloc buffers
- Get a list of leaks:
leaks --list Memgraph.memgraph
OUTPUT:
Hardware Model: iPhone9,3
Process: ****
Path: ****
Load Address: 0x100cb4000
Identifier: ****
Version: ???
Code Type: ARM64
Platform: iOS
Parent Process: debugserver [1424]
Date/Time: 2022-01-18 10:11:08.826 +0100
Launch Time: 2022-01-18 10:02:49.346 +0100
OS Version: iPhone OS 15.0 (19A346)
Report Version: 104
Physical footprint: 17.9M
Physical footprint (peak): 23.5M
----
leaks Report Version: 3.0
Process 1420: 40991 nodes malloced for 5506 KB
Process 1420: 5 leaks for 10944 total leaked bytes.
Leak: 0x1064242c0 size=64 zone: DefaultMallocZone_0x1010b8000 CFString ObjC CoreFoundation
Leak: 0x106446200 size=16 zone: DefaultMallocZone_0x1010b8000 CFString (Storage) C CoreFoundation
Leak: 0x10646a760 size=48 zone: DefaultMallocZone_0x1010b8000 CFString ObjC CoreFoundation
Leak: 0x10646a790 size=64 zone: DefaultMallocZone_0x1010b8000 CFString ObjC CoreFoundation
Leak: 0x107088a00 size=10752 zone: DefaultMallocZone_0x1010b8000 _TtCs12_SwiftObject ObjC libswiftCore.dylib- Get reference tree and group them:
leaks --referenceTree --groupByType Memgraph.memgraphShow the malloc and anonymous VM allocations that the process has performed. Needs MallocStackLogging enabled. (Doesn't work for Network extension).