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// ---
// Author: Sanjay Ghemawat
//
// Test speed of handling fragmented heap
#include "config_for_unittests.h"
#include <stdlib.h>
#include <stdio.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/time.h> // for struct timeval
#include <sys/resource.h> // for getrusage
#endif
#ifdef _WIN32
#include <windows.h> // for GetTickCount()
#endif
#include <vector>
#include "base/logging.h"
#include "common.h"
#include <gperftools/malloc_extension.h>
using std::vector;
int main(int argc, char** argv) {
// Make kAllocSize one page larger than the maximum small object size.
static const int kAllocSize = kMaxSize + kPageSize;
// Allocate 400MB in total.
static const int kTotalAlloc = 400 << 20;
static const int kAllocIterations = kTotalAlloc / kAllocSize;
// Allocate lots of objects
vector<char*> saved(kAllocIterations);
for (int i = 0; i < kAllocIterations; i++) {
saved[i] = new char[kAllocSize];
}
// Check the current "slack".
size_t slack_before;
MallocExtension::instance()->GetNumericProperty("tcmalloc.slack_bytes",
&slack_before);
// Free alternating ones to fragment heap
size_t free_bytes = 0;
for (int i = 0; i < saved.size(); i += 2) {
delete[] saved[i];
free_bytes += kAllocSize;
}
// Check that slack delta is within 10% of expected.
size_t slack_after;
MallocExtension::instance()->GetNumericProperty("tcmalloc.slack_bytes",
&slack_after);
CHECK_GE(slack_after, slack_before);
size_t slack = slack_after - slack_before;
CHECK_GT(double(slack), 0.9*free_bytes);
CHECK_LT(double(slack), 1.1*free_bytes);
// Dump malloc stats
static const int kBufSize = 1<<20;
char* buffer = new char[kBufSize];
MallocExtension::instance()->GetStats(buffer, kBufSize);
VLOG(1, "%s", buffer);
delete[] buffer;
// Now do timing tests
for (int i = 0; i < 5; i++) {
static const int kIterations = 100000;
#ifdef HAVE_SYS_RESOURCE_H
struct rusage r;
getrusage(RUSAGE_SELF, &r); // figure out user-time spent on this
struct timeval tv_start = r.ru_utime;
#elif defined(_WIN32)
long long int tv_start = GetTickCount();
#else
# error No way to calculate time on your system
#endif
for (int i = 0; i < kIterations; i++) {
size_t s;
MallocExtension::instance()->GetNumericProperty("tcmalloc.slack_bytes",
&s);
}
#ifdef HAVE_SYS_RESOURCE_H
getrusage(RUSAGE_SELF, &r);
struct timeval tv_end = r.ru_utime;
int64 sumsec = static_cast<int64>(tv_end.tv_sec) - tv_start.tv_sec;
int64 sumusec = static_cast<int64>(tv_end.tv_usec) - tv_start.tv_usec;
#elif defined(_WIN32)
long long int tv_end = GetTickCount();
int64 sumsec = (tv_end - tv_start) / 1000;
// Resolution in windows is only to the millisecond, alas
int64 sumusec = ((tv_end - tv_start) % 1000) * 1000;
#else
# error No way to calculate time on your system
#endif
fprintf(stderr, "getproperty: %6.1f ns/call\n",
(sumsec * 1e9 + sumusec * 1e3) / kIterations);
}
printf("PASS\n");
return 0;
}