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From: "matt at use dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers
Date: Fri, 17 Aug 2012 21:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54307

             Bug #: 54307
           Summary: [4.7 regression] increases in memory usage by some
                    C++11 (and C++03) standard containers
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: matt@use.net


Between 4.6 and 4.7.x, the memory used by a few standard containers has
increased, resulting in some OOM and performance issues on an amd64 application
I work on.

4.7:
list<int> size     = 24
unordered_map<int,int> size     = 64
unordered_set<int,int> size     = 64

4.6:
list<int> size     = 16
unordered_map<int,int> size     = 56
unordered_set<int,int> size     = 56

comparing to VC11:
list<int> size   = 16
unordered_map<int,int> size     = 64
unordered_set<int,int> size     = 64

compile commandline is just -std=c++0x. testcase program below:

#include <vector>
#include <array>
#include <deque>
#include <forward_list>
#include <list>
#include <queue>
#include <stack>
#include <tuple>
#include <map>
#include <set>
#include <hash_map>
#include <hash_set>
#include <unordered_map>
#include <unordered_set>
#include <string>

using namespace std;

int main(void)
{
    vector<int> v; printf("vector<int> size\t = %d\n", sizeof(v));
    array<int,5> a; printf("array<int,5> size\t = %d\n", sizeof(a));
    deque<int> d; printf("deque<int> size\t = %d\n", sizeof(d));
    forward_list<int> f; printf("forward_list<int> size\t = %d\n", sizeof(f));
    list<int> l; printf("list<int> size\t = %d\n", sizeof(l));
    queue<int> q; printf("queue<int> size\t = %d\n", sizeof(q));
    stack<int> s; printf("stack<int> size\t = %d\n", sizeof(s));
    tuple<int,int,int> t; printf("tuple<int,int,int> size\t = %d\n",
sizeof(t));
    map<int,int> m; printf("map<int,int> size\t = %d\n", sizeof(m));
    set<int> set; printf("set<int> size\t = %d\n", sizeof(set));
    unordered_map<int,int> um; printf("unordered_map<int,int> size\t = %d\n",
sizeof(um));
    unordered_set<int> us; printf("unordered_set<int,int> size\t = %d\n",
sizeof(us));
    string str; printf("string size\t = %d\n", sizeof(string));
    return 0;
}