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Re: Binary Plist generation very slow
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Re: Binary Plist generation very slow


  • Subject: Re: Binary Plist generation very slow
  • From: Alexander Spohr <email@hidden>
  • Date: Mon, 10 Dec 2012 15:43:42 +0100

Never use dicts or arrays as a hashtable’s keys!

I removed the uniquing of dicts, arrays and sets. I now use an int based hash table with object.hashCode() as the key. My binary property list generation is now faster than the string based version.

The test file is a 11MB string based property list, run over a 100 times each.
Duration: 15805ms NSPropertyListOpenStepFormat
Duration: 10084ms NSPropertyListBinaryFormat_v1_0

If java could provide the address of an object I would use that and unique the collections again. The address would be a nice hash key. Unfortunately you don’t get addresses in Java and the hashCode() of collections are unusable.

	atze


Original file (contains lots of spaces):
-rw-r--r--@  1 atze  atze  11786993  9 Dez 18:35 3500Attacks.plist

Binary:
-rw-r--r--   1 atze  atze   1270690 10 Dez 15:39 3500Attacks.plistb

Reverse test to ensure both (string & binary) generate the same output (using tabs instead of spaces):
-rw-r--r--   1 atze  atze   6819317 10 Dez 15:39 3500Attacks.plistx
-rw-r--r--   1 atze  atze   6819317 10 Dez 15:39 3500Attacks.plisty




Am 06.12.2012 um 11:16 schrieb Alexander Spohr <email@hidden>:

> Hi List,
>
> we tried to switch from string based plists to binary ones. The clients love it but it almost kills the servers.
>
> The binary plist generation is 26 times slower (for my test case):
> Duration:  2881 ms NSPropertyListOpenStepFormat
> Duration: 75008 ms NSPropertyListBinaryFormat_v1_0
>
> Does anyone have a faster binary plist generator at hand before I try to roll my own?
>
> 	atze

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References: 
 >Binary Plist generation very slow (From: Alexander Spohr <email@hidden>)

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