From: "Zhou, Zhiguo" <zhiguo.zhou@intel.com>
To: "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Subject: RFC: Lock-free XLog Reservation from WAL
Thread-Topic: RFC: Lock-free XLog Reservation from WAL
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Date: Thu, 2 Jan 2025 09:14:44 +0000
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--_002_PH7PR11MB57960AF063703DEB96FBCA98EF142PH7PR11MB5796namp_
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Hi all,

I am reaching out to solicit your insights and comments on a recent proposa=
l regarding the "Lock-free XLog Reservation from WAL." We have identified s=
ome challenges with the current WAL insertions, which require space reserva=
tions in the WAL buffer which involve updating two shared-memory statuses i=
n XLogCtlInsert: CurrBytePos (the start position of the current XLog) and P=
revBytePos (the prev-link to the previous XLog). Currently, the use of XLog=
CtlInsert.insertpos_lck ensures consistency but introduces lock contention,=
 hindering the parallelism of XLog insertions.

To address this issue, we propose the following changes:

1. Removal of PrevBytePos: This will allow increments of the CurrBytePos (a=
 single uint64 field) to be implemented with an atomic operation (fetch_add=
).
2. Updating Prev-Link of next XLog: Based on the fact that the prev-link of=
 the next XLog always points to the head of the current Xlog,we will slight=
ly exceed the reserved memory range of the current XLog to update the prev-=
link of the next XLog, regardless of which backend acquires the next memory=
 space. The next XLog inserter will wait until its prev-link is updated for=
 CRC calculation before starting its own XLog copy into the WAL.
3. Breaking Sequential Write Convention: Each backend will update the prev-=
link of its next XLog first, then return to the header position for the cur=
rent log insertion. This change will reduce the dependency of XLog writes o=
n previous ones (compared with the sequential writes).
4. Revised GetXLogBuffer: To support #3, we need update this function to se=
parate the LSN it intends to access from the LSN it expects to update in th=
e insertingAt field.
5. Increase NUM_XLOGINSERT_LOCKS: With the above changes, increasing NUM_XL=
OGINSERT_LOCKS, for example to 128, could effectively enhance the paralleli=
sm.

The attached patch could pass the regression tests (make check, make check-=
world), and in the performance test of this POC on SPR (480 vCPU) shows tha=
t this optimization could help the TPCC benchmark better scale with the cor=
e count and as a result the performance with full cores enabled could be im=
proved by 2.04x.

Before we proceed with further patch validation and refinement work, we are=
 eager to hear the community's thoughts and comments on this optimization s=
o that we can confirm our current work aligns with expectations.


--_002_PH7PR11MB57960AF063703DEB96FBCA98EF142PH7PR11MB5796namp_
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