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// Test that setting the nursery size works as expected.
//
// It's an error to set the minimum size greater than the maximum
// size. Parameter values are rounded to the nearest legal nursery
// size.
load(libdir + "asserts.js");
const chunkSizeKB = gcparam('chunkBytes') / 1024;
var testSizesKB = [128, 129, 255, 256, 516, 1023, 1024, 3*1024, 4*1024+1, 16*1024];
// Valid maximum sizes must be >= 1MB.
var testMaxSizesKB = testSizesKB.filter(x => x >= 1024);
for (var max of testMaxSizesKB) {
// Don't test minimums greater than the maximum.
for (var min of testSizesKB.filter(x => x <= max)) {
setMinMax(min, max);
}
}
// The above loops raised the nursery size. Now reduce it to ensure that
// forcibly-reducing it works correctly.
gcparam('minNurseryBytes', 256*1024); // need to avoid min > max;
setMinMax(256, 1024);
// Try an invalid configuration.
assertErrorMessage(
() => setMinMax(2*1024, 1024),
Object,
"Parameter value out of range");
function setMinMax(min, max) {
// Set the maximum first so that we don't hit a case where max < min.
gcparam('maxNurseryBytes', max * 1024);
gcparam('minNurseryBytes', min * 1024);
assertEq(gcparam('maxNurseryBytes'), nearestLegalSize(max) * 1024);
assertEq(gcparam('minNurseryBytes'), nearestLegalSize(min) * 1024);
allocateSomeThings();
gc();
}
function allocateSomeThings() {
for (var i = 0; i < 1000; i++) {
var obj = { an: 'object', with: 'fields' };
}
}
function nearestLegalSize(sizeKB) {
let step = sizeKB >= chunkSizeKB ? chunkSizeKB : 4;
return round(sizeKB, step);
}
function round(x, y) {
x += y / 2;
return x - (x % y);
}
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