perf(app): parallelize per-tx gas classification in checkTotalBlockGas

[amir-deris]

Summary

checkTotalBlockGas iterates every tx in a proposed block to compute total gas. Each tx's classification (EVM check, gasless check, gas extraction) is independent, making the loop a natural fan-out target.

Changes

• checkTotalBlockGas — replaced the serial loop with a two-phase design:
  • Phase 1 (parallel): up to 32 concurrent goroutines, one per tx, each calling classifyTxForGas. Results are written into a pre-allocated []txGasResult slice indexed by position (no lock needed on the slice).
  • Phase 2 (serial): single pass over results for malicious-tx detection, overflow-safe accumulation, and MaxGasWanted/MaxGas limit enforcement.
• classifyTxForGas — extracted helper that owns all per-tx logic. EVM txs (the vast majority) run fully unlocked. The non-EVM IsTxGasless path takes a ctxMu mutex because sdk.Context wraps a CacheMultiStore that is not goroutine-safe.
• txGasResult — small struct (gasWanted, gasContrib, skip, malicious) that carries each tx's outcome between phases.
• Dropped nonzeroTxsCnt — it was declared and incremented but never read.

Safety

• No data races: each goroutine owns its results[i] slot; ctxMu serializes the only shared-state reader (IsTxGasless).
• On typical EVM-heavy blocks ctxMu is uncontested — oracle-vote txs are the only non-EVM path that acquires it.
• Semantics of the overflow check and gas-limit enforcement are unchanged; they moved to the serial accumulation phase where the running total is available.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 6, 2026, 4:44 PM

[codecov]

Codecov Report

❌ Patch coverage is 69.69697% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.04%. Comparing base (6dfc44c) to head (f8f2841).

Files with missing lines	Patch %	Lines
app/app.go	69.69%	13 Missing and 7 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3399   +/-   ##
=======================================
  Coverage   59.03%   59.04%           
=======================================
  Files        2102     2102           
  Lines      173237   173256   +19     
=======================================
+ Hits       102277   102291   +14     
- Misses      62083    62086    +3     
- Partials     8877     8879    +2     

Flag	Coverage Δ
sei-chain-pr	50.71% <69.69%> (?)
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	69.89% <69.69%> (+0.04%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.