iosiphonememorymemory leakperformance
There are many common apps available to show total system RAM usage and free. However, my understanding is only a jailbroken phone has access to the APIs to access PER PROCESS memory usage on iOS. How can one do this most effectively?
This link has a few example tools but they all seem outdated and no information if they work on iOS 5 & iOS 6. http://www.ifans.com/forums/threads/troubleshooting-memory-issues.142660/
By observing log messages in ~/Library/Logs/Ubiquity/<my username>/, I realized that Ubiquity (iCloud process) kept trying to create a file in a folder that doesn't exist:
I opened up the Terminal and created this directory and its parent directories up to .ubd:
cd ~/Library/Mobile\ Documents/
sudo mkdir .ubd && cd .ubd
sudo mkdir peer-E2B13E4F-56F7-C79B-1621-E30738B638FE-v23 && cd peer-E2B13E4F-56F7-C79B-1621-E30738B638FE-v23
sudo mkdir ftr
Then I changed the newly created directories' owner from root to myself:
cd ../..
sudo chown -R <my username> .ubd/
The fan turned silent instantly.
To see if CPU or memory is the issue you might start with iostat and vm_stat You would run these from a Terminal.
To get it to continually record you need to run it as
iostat n
where n is the number of seconds between executions.
If you need to look at memory usage then you would want
vm_stat n
If you want to get information on a particular program then you would probably need to write a script that called something like
ps wwaux | grep your_program_name
over and over.
Best Answer
Xcode has an app called Instruments and you can use it to gather all sorts of CPU and memory statistics both live as the device runs and to save for analysis over time. This use of the tool doesn't require a developer account, any paid software, or a jailbroken device. You do need to set up the devices in Xcode's organizer to indicate you wish to use them for development and connect them via USB - just cancel out of any requests to manage certificates or developer profiles as you add each device to Xcode's organizer.
Above is a one click, capture and you can dive as deep as I could imagine anyone needs by selecting extra data to be sampled and displayed...