snapshot, pool: use acquire_nolock to avoid CAS in snapin

[mjain-jump]

No description provided.

[Copilot]

Pull request overview

Adds an optional non-atomic pool acquisition path to reduce snapshot-loading CAS overhead.

Changes:

• Implements and tests acquire_nolock for parallel pools.
• Uses the new API for snapshot account allocation.
• Adds regression coverage for incremental snapshot retries and pool reuse.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/util/tmpl/fd_pool_para.c	Adds optional non-atomic acquisition.
src/util/tmpl/test_pool_para.c	Tests nolock pool behavior.
src/flamenco/accdb/fd_accdb_private.h	Enables nolock acquisition for the account pool.
src/flamenco/accdb/fd_accdb.c	Uses nolock acquisition during snapshot loading.
src/flamenco/accdb/fd_accdb.h	Documents exclusive snapshot pool access.
src/flamenco/accdb/test_accdb.c	Tests pool reuse across incremental retries.

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-424669000-perf per slot	0.05179 s	0.051932 s	0.274% ✅
backtest mainnet-424669000-perf snapshot load	1.996 s	1.984 s	-0.601% ✅
backtest mainnet-424669000-perf total elapsed	67.119315 s	67.304451 s	0.276% ✅
firedancer mem usage with mainnet.toml	317.86 GiB	317.86 GiB	0.000% ✅

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-424669000-perf per slot	0.047952 s	0.048006 s	0.113% ✅
backtest mainnet-424669000-perf snapshot load	1.895 s	1.882 s	-0.686% ✅
backtest mainnet-424669000-perf total elapsed	62.146094 s	62.215477 s	0.112% ✅
firedancer mem usage with mainnet.toml	317.86 GiB	317.86 GiB	0.000% ✅

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-424669000-perf per slot	0.048106 s	0.048076 s	-0.062% ✅
backtest mainnet-424669000-perf snapshot load	1.904 s	1.875 s	-1.523% ✅
backtest mainnet-424669000-perf total elapsed	62.345128 s	62.306676 s	-0.062% ✅
firedancer mem usage with mainnet.toml	317.86 GiB	317.86 GiB	0.000% ✅

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-424669000-perf per slot	0.047991 s	0.048033 s	0.088% ✅
backtest mainnet-424669000-perf snapshot load	1.927 s	1.89 s	-1.920% ✅
backtest mainnet-424669000-perf total elapsed	62.196001 s	62.251216 s	0.089% ✅
firedancer mem usage with mainnet.toml	317.86 GiB	317.86 GiB	0.000% ✅