SG1 in Wroclaw

If we have chunking, we need to expose a control on the chunk size
SF F N A SA
1 2 3 1 1
No consensus
SA: in a standard facility, I think this can only lead to bad cross-platform experiences, we have
plenty of elite tools for the elite to go use to get whatever they really want

We need a version of the bulk API that presents the chunk to the callable in order to implement the
parallel algorithms
SF F N A SA
4 2 1 0 1
Consensus
SA: any quality implementation of the parallel algorithms on a scheduler will want to be customized
for that scheduler

We need a version of the bulk API that creates an execution agent per iteration
SF F N A SA
2 3 3 0 0
Unanimous consent

We believe / desire:

1. Bulk needs an execution policy to describe the callable, IF the scheduler also has an execution
   policy (for debugging for example) then a conservative choice should be used (seq is more
   conservative than par)
2. No SG1 concerns with the proposed exception handling
3. No change to status quo on default implementation of bulk being serial
4. No change to status quo on bulk having a predecessor
5. Forms of bulk needed:
   bulk -> f(i) -> bulk_chunked
   bulk_chunked -> f(b, e)
   bulk_unchunked -> f(i) "execution agent per iteration"
   SF F N A SA
   5 2 1 0 0
   Unanimous consent

P3481R1 std::execution::bulk() issues (Lucian Radu Teodorescu, Ruslan Arutyunyan, Lewis Baker)

SG1 in Hagenberg:

Poll: Forward P3481R1 with the following notes:

• bulk_unchunked should not have an execution policy
• calling an un-customized bulk_unchunked is ill-formed on a concurrent scheduler
• the next revision of this paper (before LWG) needs wording for its error model
  SF F N A SA
  8 2 2 0 0
  Unanimous consent

2025-02-12 Library Evolution Hagenberg Meeting

P3481R1: std::execution::bulk() issues

2025-02-12 Library Evolution Hagenberg Minutes

Champion: Lucian Teodorescu
Chair: Fabio Fracassi / Inbal Levi
Minute Taker: Guy Davidson

Summary

ACTION: Have an SG1 wording person review the wording to make sure the guarantees are properly stated.

POLL: Forward P3481R2 to LWG for C++26.

Attendance: 19 (IP) + 3 (R)
Author's Position: 3xSF
Outcome: Unanimous consent in favour

Next Steps

Verify wording for guarantees properly defined with SG1-wording expert, and forward P3481R2 to LWG for C++26.
NOTE: P3564 was discussed as part of P3481R2 as well.

P3481R2 std::execution::bulk() issues (Lucian Radu Teodorescu, Ruslan Arutyunyan, Lewis Baker)

P3481R3 std::execution::bulk() issues (Lucian Radu Teodorescu, Ruslan Arutyunyan, Lewis Baker, Mark Hoemmen)