Testing out some different serialization libraries.

main.m

//
//  main.m
//  mdb-bench
//
//  Created by Samuel Sutch on 9/29/13.
//  Copyright (c) 2013 Steamboat Labs. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <JSONKit/JSONKit.h>


@interface Hello : NSObject <NSCoding>

@property (nonatomic) NSString *thestring;
@property (nonatomic) NSString *otherstring;
@property (nonatomic) NSDictionary *somedict;
@property (nonatomic) NSNumber *anumber;

- (NSDictionary *)toJSON;
- (id)initWithJSON:(NSDictionary *)dict;

@end

@implementation Hello

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.thestring forKey:@"thestring"];
    [aCoder encodeObject:self.otherstring forKey:@"otherstring"];
    [aCoder encodeObject:self.somedict forKey:@"somedict"];
    [aCoder encodeObject:self.anumber forKey:@"anumber"];
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        _thestring = [aDecoder decodeObjectForKey:@"thestring"];
        _otherstring = [aDecoder decodeObjectForKey:@"otherstring"];
        _somedict = [aDecoder decodeObjectForKey:@"somedict"];
        _anumber = [aDecoder decodeObjectForKey:@"anumber"];
    }
    return self;
}

- (NSDictionary *)toJSON
{
    NSMutableDictionary *d = [[NSMutableDictionary alloc] init];
    d[@"thestring"] = self.thestring;
    d[@"otherstring"] = self.otherstring;
    d[@"somedict"] = self.somedict;
    d[@"anumber"] = self.anumber;
    return d;
}

- (id)initWithJSON:(NSDictionary *)dict
{
    self = [self init];
    if (self) {
        _thestring = dict[@"thestring"];
        _otherstring = dict[@"otherstring"];
        _somedict = dict[@"somedict"];
        _anumber = dict[@"anumber"];
    }
    return self;
}

@end

#define NUM_OBJECTS 50
#define NUM_ITERATIONS 1000

int main(int argc, const char * argv[])
{
    @autoreleasepool {

        NSMutableArray *objs = [NSMutableArray array];
        
        for (int i = 0; i < NUM_OBJECTS; i++) {
            Hello *obj = [[Hello alloc] init];
            obj.thestring = [NSString stringWithFormat:@"some string: %d", i];
            obj.otherstring = [NSString stringWithFormat:@"other string: %d", i];
            obj.somedict = @{@"somedict": @{@"somesubdict": @[@"some array value", @"other array value"]}};
            obj.anumber = [NSNumber numberWithInt:i];
            [objs addObject:obj];
        }
        
        NSMutableArray *datas = [NSMutableArray arrayWithCapacity:NUM_ITERATIONS * NUM_OBJECTS];
        NSData *dat;
        NSTimeInterval start, end;
        
        {
            start = [NSDate timeIntervalSinceReferenceDate];
            
            for (int i = 0; i < NUM_ITERATIONS; i++) {
                for (int j = 0; j < NUM_OBJECTS; j++) {
                    [datas addObject:(dat = [NSKeyedArchiver archivedDataWithRootObject:objs[j]])];
                }
            }
            
            end = [NSDate timeIntervalSinceReferenceDate];
        }
        
        NSLog(@"NSKeyedArchiver encode %d objects %f", NUM_ITERATIONS * NUM_OBJECTS, end - start);
        NSLog(@"NSKeyedArchiver data size %ld", (unsigned long)dat.length);
        
        {
            start = [NSDate timeIntervalSinceReferenceDate];
            
            for (NSData *data in datas) {
                [NSKeyedUnarchiver unarchiveObjectWithData:data];
            }
            
            end = [NSDate timeIntervalSinceReferenceDate];
        }
        
        NSLog(@"NSKeyedUnarchiver decode %ld objects %f", datas.count, end - start);
        
        [datas removeAllObjects];
        
        {
            start = [NSDate timeIntervalSinceReferenceDate];
            
            for (int i = 0; i < NUM_ITERATIONS; i++) {
                for (int j = 0; j < NUM_OBJECTS; j++) {
                    [datas addObject:(dat = [[objs[j] toJSON] JSONData])];
                }
            }
            
            end = [NSDate timeIntervalSinceReferenceDate];
        }
        
        NSLog(@"JSONKit encode %d objects %f", NUM_ITERATIONS * NUM_OBJECTS, end - start);
        NSLog(@"JSONKit data size %ld", (unsigned long)dat.length);
        
        {
            start = [NSDate timeIntervalSinceReferenceDate];
            
            for (NSData *data in datas) {
                [data objectFromJSONData];
            }
            
            end = [NSDate timeIntervalSinceReferenceDate];
        }
        
        NSLog(@"JSONData decode %ld objects %f", datas.count, end - start);
    }
    return 0;
}

results.txt

2013-09-29 21:47:15.425 mdb-bench[40114:303] NSKeyedArchiver encode 50000 objects 4.833274
2013-09-29 21:47:15.426 mdb-bench[40114:303] NSKeyedArchiver data size 571
2013-09-29 21:47:16.916 mdb-bench[40114:303] NSKeyedUnarchiver decode 50000 objects 1.489161
2013-09-29 21:47:17.299 mdb-bench[40114:303] JSONKit encode 50000 objects 0.375954
2013-09-29 21:47:17.300 mdb-bench[40114:303] JSONKit data size 158
2013-09-29 21:47:19.248 mdb-bench[40114:303] JSONData decode 50000 objects 1.947726