On 2/28/07, Jonah H. Harris <jonah.harris@gmail.com> wrote:
> Last time I checked, Teradata used a modified Fletcher checksum as
> well; I wasn't aware of Adler32.
I added adler32 to Gurjeet Singh's crc testing utility, compiled it
with gcc 4.0.0 on a single-core Opteron running FC4, and configured it
for 8K block sizes.
GCC options were -mtune=opteron and the optimizations stated below:
Generic optimization:
test parameters:: SF=1, block_size=8, list_size=1000
Generating data... done. Time taken : 93 milliseconds
Generating CRC using PG (vanilla) algo... done. Time taken : 117 milliseconds
Verifying CRC using PG (vanilla) algo... done. Time taken : 89 milliseconds
Generating CRC using SliceBy8 algo... done. Time taken : 44 milliseconds
Verifying CRC using SliceBy8 algo... done. Time taken : 44 milliseconds
Generating CRC using Adler32 algo... done. Time taken : 52 milliseconds
Verifying CRC using Adler32 algo... done. Time taken : 53 milliseconds
Using -O2
test parameters:: SF=1, block_size=8, list_size=1000
Generating data... done. Time taken : 85 milliseconds
Generating CRC using PG (vanilla) algo... done. Time taken : 31 milliseconds
Verifying CRC using PG (vanilla) algo... done. Time taken : 30 milliseconds
Generating CRC using SliceBy8 algo... done. Time taken : 30 milliseconds
Verifying CRC using SliceBy8 algo... done. Time taken : 30 milliseconds
Generating CRC using Adler32 algo... done. Time taken : 14 milliseconds
Verifying CRC using Adler32 algo... done. Time taken : 14 milliseconds
Using -O3
test parameters:: SF=1, block_size=8, list_size=1000
Generating data... done. Time taken : 87 milliseconds
Generating CRC using PG (vanilla) algo... done. Time taken : 31 milliseconds
Verifying CRC using PG (vanilla) algo... done. Time taken : 31 milliseconds
Generating CRC using SliceBy8 algo... done. Time taken : 30 milliseconds
Verifying CRC using SliceBy8 algo... done. Time taken : 30 milliseconds
Generating CRC using Adler32 algo... done. Time taken : 14 milliseconds
Verifying CRC using Adler32 algo... done. Time taken : 15 milliseconds
Interesting...
--
Jonah H. Harris, Software Architect | phone: 732.331.1324
EnterpriseDB Corporation | fax: 732.331.1301
33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com
Iselin, New Jersey 08830 | http://www.enterprisedb.com/
