Re: Speed up Clog Access by increasing CLOG buffers

On 7 January 2016 at 05:24, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> On Fri, Dec 25, 2015 at 6:36 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>>
>> On Wed, Dec 23, 2015 at 1:16 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
>> wrote:
>> >> >
>> >> > 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.
>> >>
>> >> I sort of hate to make these member names any longer, but I wonder if
>> >> we should make it procArrayGroupClearXid etc.
>> >
>> > If we go by this suggestion, then the name will look like:
>> > PGProc
>> > {
>> > ..
>> > bool procArrayGroupClearXid, pg_atomic_uint32
>> > procArrayGroupNextClearXid,
>> > TransactionId procArrayGroupLatestXid;
>> > ..
>> >
>> > PROC_HDR
>> > {
>> > ..
>> > pg_atomic_uint32 procArrayGroupFirstClearXid;
>> > ..
>> > }
>> >
>> > I think whatever I sent in last patch were better. It seems to me it is
>> > better to add some comments before variable names, so that anybody
>> > referring them can understand better and I have added comments in
>> > attached patch rename_pgproc_variables_v2.patch to explain the same.
>>
>> Well, I don't know. Anybody else have an opinion?
>>
>
> It seems that either people don't have any opinion on this matter or they
> are okay with either of the naming conventions being discussed. I think
> specifying Member after procArrayGroup can help distinguishing which
> variables are specific to the whole group and which are specific to a
> particular member. I think that will be helpful for other places as well
> if we use this technique to improve performance. Let me know what
> you think about the same.
>
> I have verified that previous patches can be applied cleanly and passes
> make check-world. To avoid confusion, I am attaching the latest
> patches with this mail.

Patches still apply 1 month later.

I don't really have an opinion on the variable naming. I guess they
only need making longer if there's going to be some confusion about
what they're for, but I'm guessing it's not a blocker here.

Thom