Adding optional handshakes to acknowledge the received data

[hkaiser]

• this prevents sends to be posted before their corresponding receives
• this option can be enabled by adding the command line argument --hpx:ini=hpx.parcel.mpi.ack_handshake!=1

[StellarBot]

Performance test report

HPX Performance

Comparison

BENCHMARK	FORK_JOIN_EXECUTOR	PARALLEL_EXECUTOR	SCHEDULER_EXECUTOR
For Each	--	--	--

Info

Property	Before	After
HPX Datetime	2024-03-18T14:00:30+00:00	2024-07-12T22:13:04+00:00
HPX Commit	d27ac2e	9f49a70
Datetime	2024-03-18T09:18:04.949759-05:00	2024-07-12T17:25:12.443222-05:00
Hostname	medusa08.rostam.cct.lsu.edu	medusa08.rostam.cct.lsu.edu
Compiler	/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1	/opt/apps/llvm/18.1.5/bin/clang++ 18.1.5
Clustername	rostam	rostam
Envfile

Comparison

BENCHMARK	NO-EXECUTOR
Future Overhead - Create Thread Hierarchical - Latch	--

Info

Property	Before	After
HPX Datetime	2024-03-18T14:00:30+00:00	2024-07-12T22:13:04+00:00
HPX Commit	d27ac2e	9f49a70
Datetime	2024-03-18T09:19:53.062988-05:00	2024-07-12T17:27:02.341229-05:00
Hostname	medusa08.rostam.cct.lsu.edu	medusa08.rostam.cct.lsu.edu
Compiler	/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1	/opt/apps/llvm/18.1.5/bin/clang++ 18.1.5
Clustername	rostam	rostam
Envfile

Comparison

BENCHMARK	FORK_JOIN_EXECUTOR_DEFAULT_FORK_JOIN_POLICY_ALLOCATOR	PARALLEL_EXECUTOR_DEFAULT_PARALLEL_POLICY_ALLOCATOR	SCHEDULER_EXECUTOR_DEFAULT_SCHEDULER_EXECUTOR_ALLOCATOR
Stream Benchmark - Add	--	--	--
Stream Benchmark - Scale	--	-	---
Stream Benchmark - Triad	--	--	--
Stream Benchmark - Copy	--	--	---

Info

Property	Before	After
HPX Datetime	2024-03-18T14:00:30+00:00	2024-07-12T22:13:04+00:00
HPX Commit	d27ac2e	9f49a70
Datetime	2024-03-18T09:20:13.002391-05:00	2024-07-12T17:27:20.138018-05:00
Hostname	medusa08.rostam.cct.lsu.edu	medusa08.rostam.cct.lsu.edu
Compiler	/opt/apps/llvm/13.0.1/bin/clang++ 13.0.1	/opt/apps/llvm/18.1.5/bin/clang++ 18.1.5
Clustername	rostam	rostam
Envfile

Explanation of Symbols

Symbol	MEANING
=	No performance change (confidence interval within ±1%)
(=)	Probably no performance change (confidence interval within ±2%)
(+)/(-)	Very small performance improvement/degradation (≤1%)
+/-	Small performance improvement/degradation (≤5%)
++/--	Large performance improvement/degradation (≤10%)
+++/---	Very large performance improvement/degradation (>10%)
?	Probably no change, but quite large uncertainty (confidence interval with ±5%)
??	Unclear result, very large uncertainty (±10%)
???	Something unexpected…