Re: COMMIT NOWAIT Performance Option - Mailing list pgsql-hackers
From | Jonah H. Harris |
---|---|
Subject | Re: COMMIT NOWAIT Performance Option |
Date | |
Msg-id | 36e682920702281934v7ba7041dl6c16ca6ae19a4224@mail.gmail.com Whole thread Raw |
In response to | Re: COMMIT NOWAIT Performance Option ("Jonah H. Harris" <jonah.harris@gmail.com>) |
Responses |
Re: COMMIT NOWAIT Performance Option
("Jonah H. Harris" <jonah.harris@gmail.com>)
|
List | pgsql-hackers |
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/
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