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-rw-r--r--js/src/jit-test/tests/debug/Memory-allocationSamplingProbability-02.js36
1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Memory-allocationSamplingProbability-02.js b/js/src/jit-test/tests/debug/Memory-allocationSamplingProbability-02.js
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+++ b/js/src/jit-test/tests/debug/Memory-allocationSamplingProbability-02.js
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+// Test that we only sample about allocationSamplingProbability * 100 percent of
+// allocations.
+
+const root = newGlobal();
+
+const dbg = new Debugger();
+const wrappedRoot = dbg.addDebuggee(root);
+
+root.eval(`
+ objs = [];
+ objs.push(new Object);
+`);
+
+root.eval("" + function makeSomeAllocations() {
+ for (var i = 0; i < 100; i++) {
+ objs.push(new Object);
+ }
+});
+
+function measure(P, expected) {
+ root.setSavedStacksRNGState(Number.MAX_SAFE_INTEGER - 1);
+ dbg.memory.allocationSamplingProbability = P;
+ root.makeSomeAllocations();
+ assertEq(dbg.memory.drainAllocationsLog().length, expected);
+}
+
+dbg.memory.trackingAllocationSites = true;
+
+// These are the sample counts that were correct when this test was last
+// updated; changes to SpiderMonkey may occasionally cause changes
+// here. Anything that is within a plausible range for the given sampling
+// probability is fine.
+measure(0.0, 0);
+measure(1.0, 100);
+measure(0.1, 11);
+measure(0.5, 49);