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// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
// Copyright (c) 2003, Google Inc.
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// ---
// Author: Sanjay Ghemawat
//
// MallocExtension::MarkThreadIdle() testing
#include "config_for_unittests.h"
#include <gperftools/malloc_extension.h>
#include <stdio.h>
#include <new>
#include <thread>
#include "gtest/gtest.h"
// Helper routine to do lots of allocations
static void TestAllocation() {
static const int kNum = 100;
void* ptr[kNum];
for (int size = 8; size <= 65536; size*=2) {
for (int i = 0; i < kNum; i++) {
ptr[i] = ::operator new(size);
}
for (int i = 0; i < kNum; i++) {
::operator delete(ptr[i]);
}
}
}
// Routine that does a bunch of MarkThreadIdle() calls in sequence
// without any intervening allocations
TEST(MarkIdleTest, MultipleIdleCalls) {
std::thread t([] () {
for (int i = 0; i < 4; i++) {
MallocExtension::instance()->MarkThreadIdle();
}
});
t.join();
}
// Routine that does a bunch of MarkThreadIdle() calls in sequence
// with intervening allocations
TEST(MarkIdleTest, MultipleIdleNonIdlePhases) {
std::thread t([] () {
for (int i = 0; i < 4; i++) {
TestAllocation();
MallocExtension::instance()->MarkThreadIdle();
}
});
t.join();
}
// Get current thread cache usage
static size_t GetTotalThreadCacheSize() {
size_t result;
EXPECT_TRUE(MallocExtension::instance()->GetNumericProperty(
"tcmalloc.current_total_thread_cache_bytes",
&result));
return result;
}
// Check that MarkThreadIdle() actually reduces the amount
// of per-thread memory.
TEST(MarkIdleTest, TestIdleUsage) {
std::thread t([] () {
const size_t original = GetTotalThreadCacheSize();
TestAllocation();
const size_t post_allocation = GetTotalThreadCacheSize();
EXPECT_GT(post_allocation, original);
MallocExtension::instance()->MarkThreadIdle();
const size_t post_idle = GetTotalThreadCacheSize();
EXPECT_LE(post_idle, original);
// Log after testing because logging can allocate heap memory.
printf("Original usage: %zu\n", original);
printf("Post allocation: %zu\n", post_allocation);
printf("Post idle: %zu\n", post_idle);
});
t.join();
}