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Performance Optimization for iOS Apps
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Vitalii Topoliuk
August 14, 2013
Programming
3
97
Performance Optimization for iOS Apps
Tips & Tricks from personal experience.
Vitalii Topoliuk
August 14, 2013
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Transcript
Performance Optimization Vitalii Topoliuk @vtopoliuk
- Performance scenarios - How to measure performance - How
to improve key scenarios - Tips and Tricks Contents:
- Not just about speed - CPU tasks - Memory
- Rendering - File I/O - Networking - Power Performance Performance scenarios
- Not just about speed - CPU tasks - Memory
- Rendering - File I/O - Networking - Power Performance Performance scenarios
Overall recommendations Performance scenarios - Don’t guess, just measure -
Measure on slowest device - Measure on pessimistic data - Measure on real data
How to measure Performance scenarios - Instruments - Logging -
Quartz Debug (OS X)
CPU Performance Optimization
- Unhappy users CPU CPU Tasks Optimization
- Unhappy users - System can abort your app CPU
CPU Tasks Optimization
Time Profiler Demo CPU Tasks Optimization
CPU Tasks Optimization
CPU Tasks Optimization
- do less work - do work later - do
slow in background and use placeholders - do work faster Main strategies CPU Tasks Optimization
Memory Performance Optimization
- Crashes => Unhappy Users Memory Memory Optimization
Allocations & Leaks Demo Memory Optimization
Memory Optimization
Memory Optimization
Memory Optimization
- do less work - do work later - break
down work to smallest batches - use ARC :) - @autoreleasepool Main strategies Memory Optimization
.nib loading Tips and Tricks x10 faster
ARC vs MMM Tips and Tricks - (void)getPoints:(DPoint[2])outPoint forCenterPoint:(DPoint)centerPoint targetingVector:
(DVector)targetingVector skipEquation:(BOOL)skip lineWidth:(DFloat)lineWidth { DVector normVector = DVectorNormalVector(targetingVector); DFloat originX = centerPoint.x + (lineWidth / 2.0f) * normVector.x; ... // some code outPoint[1] = (DPoint){originX, originY}; }
ARC vs MMM Tips and Tricks x5 faster on MMM
- (void)getPoints:(DPoint[2])outPoint forCenterPoint:(DPoint)centerPoint targetingVector: (DVector)targetingVector skipEquation:(BOOL)skip lineWidth:(DFloat)lineWidth { DVector normVector = DVectorNormalVector(targetingVector); DFloat originX = centerPoint.x + (lineWidth / 2.0f) * normVector.x; ... // some code outPoint[1] = (DPoint){originX, originY}; }
Universal solutions Tips and Tricks [self.array addObject:[NSValue valueWithCGPoint:point]] xxx times
faster VS @interface DPointsCollection : NSObject - (void)addPoint:(CGPoint)point atIndex:(NSUInteger)index; - (void)removePointAtIndex:(NSUInteger)index; ... @end
Sorted NSArray Tips and Tricks [self.array addObject:object]; [self.array sortUsing...];
Sorted NSArray Tips and Tricks NSUInteger index = [self.array indexOfObject:object
inSortedRange:range options:NSBinarySearchingInsertionIndex usingComparator:comparator]; [self.array insertObject:object atIndex:index];
Delay large tasks Tips and Tricks - (void)addPerson:(DPerson*)person { ...
[self save]; // large task } - (void)addBook:(DBook*)book { ... [self save]; // large task }
Delay large tasks Tips and Tricks - (void)addPerson:(DPerson*)person { ...
[self delayedSave]; } - (void)addBook:(DBook*)book { ... [self delayedSave]; } - (void)delayedSave { [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(save) object:nil]; [self performSelector:@selector(save) withObject:nil afterDelay:0.1f]; }
API Levels Tips and Tricks - try high level API
first - then try lower level NSArray => CFArray => void* NSXMLParser => libxml
Questions & Answers Performance Optimization