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9 Commits

Author SHA1 Message Date
Frank Celler 6936972d08 updated disclaimer 2014-06-20 16:41:35 +02:00
Jan Steemann 5f3ea348bc separated FNV hashing functions 2014-03-31 11:41:23 +02:00
Jan Steemann 3644a73554 speed up CRC calculation 
measured speedup on an x86_64 Linux
-----------------------------------

clang, -O2, without patch:
* 5,000,000x CRC of a 256 byte buffer: TOOK: 0.858567
* 5,000,000x CRC of a 512 byte buffer: TOOK: 1.67744
* 5,000,000x CRC of a 1024 byte buffer: TOOK: 3.31552
* 5,000,000x CRC of a 2048 byte buffer: TOOK: 6.58735
* 5,000,000x CRC of a 4096 byte buffer: TOOK: 13.1924

clang, -O2, with patch
* 5,000,000x CRC of a 256 byte buffer: TOOK: 0.669745
* 5,000,000x CRC of a 512 byte buffer: TOOK: 1.3234
* 5,000,000x CRC of a 1024 byte buffer: TOOK: 2.63565
* 5,000,000x CRC of a 2048 byte buffer: TOOK: 5.26927
* 5,000,000x CRC of a 4096 byte buffer: TOOK: 10.6086

gcc, -O2, without patch:
* 5,000,000x CRC of a 256 byte buffer: TOOK: 0.752911
* 5,000,000x CRC of a 512 byte buffer: TOOK: 1.46402
* 5,000,000x CRC of a 1024 byte buffer: TOOK: 2.88934
* 5,000,000x CRC of a 2048 byte buffer: TOOK: 5.74819
* 5,000,000x CRC of a 4096 byte buffer: TOOK: 11.4839

gcc, -O2, with patch:
* 5,000,000x CRC of a 256 byte buffer: TOOK: 0.643093
* 5,000,000x CRC of a 512 byte buffer: TOOK: 1.20488
* 5,000,000x CRC of a 1024 byte buffer: TOOK: 2.39155
* 5,000,000x CRC of a 2048 byte buffer: TOOK: 4.75178
* 5,000,000x CRC of a 4096 byte buffer: TOOK: 9.34864
 2014-03-28 20:26:56 +01:00
Jan Steemann d48a2507fc fixed wrong return type 2014-03-27 09:45:25 +01:00
Frank Celler 1aa5109fa3 updated disclaimer 2013-03-13 17:03:18 +01:00
Frank Celler c915bfa5ff cleanup of indexes, fix for compaction (hash, cap, geo) 
Conflicts:
	arangod/VocBase/compactor.c
	arangod/VocBase/document-collection.c
	arangod/VocBase/synchroniser.c
	arangod/VocBase/vocbase.c
 2013-03-11 09:49:58 +01:00
Jan Steemann b5d0457f3a fixed some issues reported by cppcheck 2012-12-12 18:42:11 +01:00
Jan Steemann c353846e52 replaced 1-byte-at-a-time algorithm with 8-bytes-at-a-time algorithm for CRC32 block calculation 2012-07-05 12:13:11 +02:00
Frank Celler d2c758d663 the great rename 2012-06-08 15:01:25 +02:00