Our app creates alot of small objects while running. It mostly comes down to Autoreleased NSString and NSNumber objects. Since the app is designed to run "24/7" in the background heap fragmentation becomes a big issues.
What are the techniques to avoid that without a complete restructure of the program.
I was thinking: - object pools that would return the object to a pool after the final release, but objets need to be mutable then. (will NSMuttableString cause heap fragmentation by itself?)
How are others dealing with this issues?
EDIT: This is how I've got suspicious to memory fragmentation. Look at rpages and [vm-pageshortage]
eIncident Identifier: 81E87769-8E16-4439-AFFA-6D077E01E5ED
CrashReporter Key: 96235931c31c6b92a16f5c1b1e4cb363a3d18a67
Hardware Model: iPhone4,1
OS Version: iPhone OS 7.0.4 (11B554a)
Kernel Version: Darwin Kernel Version 14.0.0: Fri Sep 27 23:00:48 PDT 2013; root:xnu-2423.3.12~1/RELEASE_ARM_S5L8940X
Date: 2013-12-13 22:43:36 -0800
Time since snapshot: 1582 ms
Free pages: 1105
Active pages: 3668
Inactive pages: 2035
Speculative pages: 46
Throttled pages: 100120
Purgeable pages: 0
Wired pages: 22159
File-backed pages: 5400
Anonymous pages: 349
Compressions: 0
Decompressions: 0
Compressor Size: 0
Uncompressed Pages in Compressor: 0
Largest process: Argus
Processes
Name <UUID> rpages recent_max fds [reason] (state)
Facebook <979b9707d85a31df94b986d91d8c3ce7> 2368 2368 100 [vm-pageshortage] (resume)
MobileSMS <339505ebbbc4301e87379b095a38ba13> 1448 1448 100 [vm-pageshortage] (background)
MobileMail <b3574f4bded1315cb2e50e5de205be48> 1575 1575 100 [vm-pageshortage] (resume) (continuous)
tccd <1fea8c5a71943151b5cd304c7eb0fd8c> 198 198 100 [vm-pageshortage] (daemon)
kbd <be2d64e41bf43e48a09a23fb129eb0b4> 739 739 100 [vm-pageshortage] (daemon)
librariand <15fb21b24e823e158caed9f9e9d8b87a> 299 299 100 [vm-pageshortage] (daemon)
MobilePhone <10e2242652423ae28f278a807a0d6384> 1852 1852 200 [vm-pageshortage] (continuous)
CVMServer <f26614f7fef63e2faa518272f0fc600a> 96 96 200 [vm-pageshortage] (daemon)
Argus <d214b453a3453121a8495d5c8eba80fd> 51299 51299 100 [vm-pageshortage] (location) (frontmost) (resume)
identityservices <18cc20db2e4739a782cc8e38e03eff52> 398 398 100 (daemon)
wifid <a5cf99e5a0f032a69bc2f65050b44291> 652 652 25 (daemon)
syslogd <6539f4cf4dcf34daadf1d99991926680> 140 140 50 (daemon)
powerd <0a253ac2a99236809422214be1700bc0> 126 126 100 (daemon)
vmd <93cffd22b64631afa08a42f6a85e1f33> 297 297 100 (daemon)
imagent <bef102e1faef39209926fb25f428a71e> 438 438 100 (daemon)