vendredi 7 décembre 2018

JeMalloc does not create memory leak dump

I need help with memory profiling using JeMalloc.

I do the following things:

git clone https://github.com/jemalloc/jemalloc cd jemalloc ./autogen.sh --enable-perf make dist make sudo make install

export MALLOC_CONF=prof_leak:true,lg_prof_sample:0,prof_final:true LD_PRELOAD=/usr/local/Cellar/jemalloc/5.1.0/lib/libjemalloc.dylib

Then I run my application:

./some_executed_file

It is 100% that this binary file will use jemalloc Because when I call

typedef struct {
  char *cur;
  char *end;
} MallocStatus;

static void GetJemallocStatus(void *mstat_arg, const char *status) {
  MallocStatus *mstat = reinterpret_cast<MallocStatus *>(mstat_arg);
  size_t status_len = status ? strlen(status) : 0;
  size_t buf_size = (size_t)(mstat->end - mstat->cur);
  if (!status_len || status_len > buf_size) {
    return;
  }

  snprintf(mstat->cur, buf_size, "%s", status);
  mstat->cur += status_len;
}

MallocStatus mstat;
const unsigned int kMallocStatusLen = 1000000;
std::unique_ptr<char[]> buf{new char[kMallocStatusLen + 1]};
mstat.cur = buf.get();
mstat.end = buf.get() + kMallocStatusLen;
je_malloc_stats_print(GetJemallocStatus, &mstat, "");
stats->append(buf.get());

I see JeMalloc statistics.

Regarding to https://github.com/jemalloc/jemalloc/wiki/Use-Case:-Leak-Checking

I do everything correct - but I still don't see jeprof do analyze memory leaks.

Thanks in advance.

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