Re: Speed up Clog Access by increasing CLOG buffers - Mailing list pgsql-hackers

From Amit Kapila
Subject Re: Speed up Clog Access by increasing CLOG buffers
Date
Msg-id CAA4eK1JCzEksmYYquxHrVP2-B_shsydg80TH3DOVy8u=bgZNwA@mail.gmail.com
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In response to Re: Speed up Clog Access by increasing CLOG buffers  (Robert Haas <robertmhaas@gmail.com>)
Responses Re: Speed up Clog Access by increasing CLOG buffers  (Robert Haas <robertmhaas@gmail.com>)
List pgsql-hackers
On Fri, Dec 18, 2015 at 9:58 PM, Robert Haas <robertmhaas@gmail.com> wrote:
>
> On Fri, Dec 18, 2015 at 1:16 AM, Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> >> Some random comments:
> >>
> >> - TransactionGroupUpdateXidStatus could do just as well without
> >> add_proc_to_group.  You could just say if (group_no >= NUM_GROUPS)
> >> break; instead.  Also, I think you could combine the two if statements
> >> inside the loop.  if (nextidx != INVALID_PGPROCNO &&
> >> ProcGlobal->allProcs[nextidx].clogPage == proc->clogPage) break; or
> >> something like that.
> >>

Changed as per suggestion.

> >> - memberXid and memberXidstatus are terrible names.  Member of what?
> >
> > How about changing them to clogGroupMemberXid and
> > clogGroupMemberXidStatus?
>
> What we've currently got for group XID clearing for the ProcArray is
> clearXid, nextClearXidElem, and backendLatestXid.  We should try to
> make these things consistent.  Maybe rename those to
> procArrayGroupMember, procArrayGroupNext, procArrayGroupXid
>

Here procArrayGroupXid sounds like Xid at group level, how about
procArrayGroupMemberXid?
Find the patch with renamed variables for PGProc
(rename_pgproc_variables_v1.patch) attached with mail.

> and then
> start all of these identifiers with clogGroup as you propose.
>

I have changed them accordingly in the attached patch
(group_update_clog_v4.patch)  and addressed other comments given by
you.


With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
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