Adapt import commit batches from observed transaction duration

tests/headless/import-batches.test.mjs

@@ -0,0 +1,11 @@
+import {test} from 'node:test';
+import assert from 'node:assert/strict';
+import {createImportBatches} from '../../src/lib/canvas-runtime/import-batches.ts';
+test('fixed publication cost can grow beyond singleton batches without raising the time budget',()=>{
+ const batches=createImportBatches(6,32);assert.equal(batches.observed,false);assert.equal(batches.limit,1);const sizes=[];
+ for(let i=0;i<20;i++){const n=batches.limit;sizes.push(n);batches.record(n,4+n*.05);}
+ assert.equal(batches.observed,true);assert.equal(batches.limit,32);assert.ok(sizes.includes(2));assert.ok(sizes.every(n=>n<=32));
+});
+test('expensive batches back off, then recover as costs fall; partial tails do not inflate the limit',()=>{
+ const batches=createImportBatches(6,32);for(let i=0;i<4;i++)batches.record(batches.limit,1);const full=batches.limit;batches.record(1,1);assert.equal(batches.limit,full);batches.record(full,60);assert.equal(batches.limit,1);batches.record(1,12);assert.equal(batches.limit,1);batches.record(1,2);assert.equal(batches.limit,2);batches.record(2,2);assert.equal(batches.limit,3);
+});

tests/headless/imports.test.mjs

@@ -151,3 +151,7 @@ test('a resumed preallocated import retains the exact stable-ID table through pa
 test('identity allocation keeps the caller port method receiver',async()=>{
  const f=fixture([{id:'bound'}],{ports:{allocated:0,createId(){return `bound-${++this.allocated}`;}}});await f.runner.start();assert.equal(f.root.job.status,'completed');assert.equal(f.root.job.stableIds.bound,'bound-1');assert.equal(f.ports.allocated,1);assert.equal(f.errors.length,0);await f.runner.close();
 });
+
+test('fixed-cost commits amortize ready records while preserving the immediate first record and yielding after expensive work',async()=>{
+ let clock=0;const f=fixture(Array.from({length:80},(_,i)=>({id:`fixed-${i}`})),{ports:{now:()=>clock,frameBudgetMs:6,maxBatch:16,optimisticLocal:true}}),commit=f.ports.commit;f.ports.commit=(units,...rest)=>{clock+=4+units.length*.05;return commit(units,...rest);};await f.runner.start();assert.equal(f.root.job.status,'completed');assert.deepEqual(f.calls[0],['fixed-0']);assert.ok(f.calls.some(group=>group.length>=8));assert.ok(f.calls.length<20);assert.ok(f.yields>0);assert.equal(f.errors.length,0);validateImportJob(f.root.job);
+});