bug-1505622.js - mozsearch

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// Test that we don't repeatedly trigger last-ditch GCs.

// Turn of any zeal which will disrupt GC number checks.

gczeal(0);

function allocUntilFail() {

  gc(null, 'shrinking');

  const initialSize = gcparam("gcBytes");

  const initialMaxSize = gcparam("maxBytes");

  const initGCNumber = gcparam("majorGCNumber");

  // Set a small heap limit.

  gcparam("maxBytes", initialSize + 16 * 1024);

  let error;

  try {

    let a = [];

    while (true) {

      a.push(Symbol()); // Symbols are tenured.

  } catch(err) {

    error = err;

  const finalGCNumber = gcparam("majorGCNumber");

  // Resetore heap limit.

  gcparam("maxBytes", initialMaxSize);

  gc();

  assertEq(error, "out of memory");

  return finalGCNumber - initGCNumber;

// Set the time limit for skipping last ditch GCs to 5 seconds.

gcparam("minLastDitchGCPeriod", 5);

assertEq(gcparam("minLastDitchGCPeriod"), 5);

// Allocate up to the heap limit. This triggers a last ditch GC.

let gcCount = allocUntilFail();

assertEq(gcCount, 1)

// Allocate up to the limit again. The second time we fail without

// triggering a GC.

gcCount = allocUntilFail();

assertEq(gcCount, 0)

// Wait for time limit to expire.

sleep(6);

// Check we trigger a GC again.

gcCount = allocUntilFail();

assertEq(gcCount, 1)