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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;
const pageSizeKB = gcparam('systemPageSizeKB');
const testSizesKB = [128, 129, 255, 256, 516, 1023, 1024, 3*1024, 4*1024+1, 16*1024];
// Valid maximum sizes must be >= 1MB.
const testMaxSizesKB = testSizesKB.filter(x => x >= 1024);
for (let max of testMaxSizesKB) {
// Don't test minimums greater than the maximum.
for (let 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.
setMinMax(256, 1024);
// Try invalid configurations.
const badSizesKB = [ 0, 1, 129 * 1024];
function assertParamOutOfRange(f) {
assertErrorMessage(f, Object, "Parameter value out of range");
}
for (let size of badSizesKB) {
assertParamOutOfRange(() => gcparam('minNurseryBytes', size * 1024));
assertParamOutOfRange(() => gcparam('maxNurseryBytes', size * 1024));
}
function setMinMax(min, max) {
gcparam('minNurseryBytes', min * 1024);
gcparam('maxNurseryBytes', max * 1024);
assertEq(gcparam('minNurseryBytes'), nearestLegalSize(min) * 1024);
assertEq(gcparam('maxNurseryBytes'), nearestLegalSize(max) * 1024);
allocateSomeThings();
gc();
}
function allocateSomeThings() {
for (let i = 0; i < 1000; i++) {
let obj = { an: 'object', with: 'fields' };
}
}
function nearestLegalSize(sizeKB) {
let step = sizeKB >= chunkSizeKB ? chunkSizeKB : pageSizeKB;
return round(sizeKB, step);
}
function round(x, y) {
x += y / 2;
return x - (x % y);
}