[HACKERS] [PATCH] guc-ify the formerly hard-coded MAX_SEND_SIZE to max_wal_send

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От Jonathon Nelson
Тема [HACKERS] [PATCH] guc-ify the formerly hard-coded MAX_SEND_SIZE to max_wal_send
Дата
Msg-id CACJqAM2uAUnEAy0j2RRJOSM1UHPdGxCr=U-HbqEf0aAcdhUoEQ@mail.gmail.com
обсуждение исходный текст
Ответы Re: [HACKERS] [PATCH] guc-ify the formerly hard-coded MAX_SEND_SIZEto max_wal_send  (Jim Nasby <Jim.Nasby@BlueTreble.com>)
Re: [HACKERS] [PATCH] guc-ify the formerly hard-coded MAX_SEND_SIZEto max_wal_send  (Andres Freund <andres@anarazel.de>)
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Attached please find a patch for PostgreSQL 9.4 which changes the maximum amount of data that the wal sender will send at any point in time from the hard-coded value of 128KiB to a user-controllable value up to 16MiB. It has been primarily tested under 9.4 but there has been some testing with 9.5.

In our lab environment and with a 16MiB setting, we saw substantially better network utilization (almost 2x!), primarily over high bandwidth delay product links.

--
Jon Nelson
Dyn / Principal Software Engineer

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