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* [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers @ 2012-08-17 21:43 matt at use dot net 2012-08-17 22:59 ` [Bug libstdc++/54307] " hjl.tools at gmail dot com ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: matt at use dot net @ 2012-08-17 21:43 UTC (permalink / raw) To: gcc-bugs 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; } ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/54307] [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers 2012-08-17 21:43 [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers matt at use dot net @ 2012-08-17 22:59 ` hjl.tools at gmail dot com 2012-08-18 0:05 ` paolo.carlini at oracle dot com ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: hjl.tools at gmail dot com @ 2012-08-17 22:59 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54307 H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2012-08-17 Target Milestone|--- |4.7.2 Ever Confirmed|0 |1 --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-08-17 22:59:26 UTC --- I believe it has been fixed on 7.2 branch by http://gcc.gnu.org/ml/gcc-cvs/2012-07/msg00090.html Can you verified it? ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/54307] [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers 2012-08-17 21:43 [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers matt at use dot net 2012-08-17 22:59 ` [Bug libstdc++/54307] " hjl.tools at gmail dot com @ 2012-08-18 0:05 ` paolo.carlini at oracle dot com 2012-08-21 17:27 ` matt at use dot net ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: paolo.carlini at oracle dot com @ 2012-08-18 0:05 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54307 --- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-18 00:05:37 UTC --- Note that the unordered containers have been profoundly reworked to conform to C++11, the size isn't going to change. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/54307] [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers 2012-08-17 21:43 [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers matt at use dot net 2012-08-17 22:59 ` [Bug libstdc++/54307] " hjl.tools at gmail dot com 2012-08-18 0:05 ` paolo.carlini at oracle dot com @ 2012-08-21 17:27 ` matt at use dot net 2012-08-21 17:35 ` paolo.carlini at oracle dot com 2012-09-07 10:35 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: matt at use dot net @ 2012-08-21 17:27 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54307 --- Comment #3 from Matt Hargett <matt at use dot net> 2012-08-21 17:26:55 UTC --- Paolo, what about list<int>? Does VC11 achieve the size GCC 4.6 has by not being compliant somehow? ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/54307] [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers 2012-08-17 21:43 [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers matt at use dot net ` (2 preceding siblings ...) 2012-08-21 17:27 ` matt at use dot net @ 2012-08-21 17:35 ` paolo.carlini at oracle dot com 2012-09-07 10:35 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: paolo.carlini at oracle dot com @ 2012-08-21 17:35 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54307 --- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-21 17:35:25 UTC --- I have no idea what they are doing in their implementation, there are of course trade offs. When we decide to globally break the ABI to implement a C++11 Standard Conforming std:list we mean to add a data member to provide an O(1) list<>::size(), that is what we already "experimented" in 4.7.0. Unless of course over the next months somebody suggests something else which goes well together with our other design choices. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug libstdc++/54307] [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers 2012-08-17 21:43 [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers matt at use dot net ` (3 preceding siblings ...) 2012-08-21 17:35 ` paolo.carlini at oracle dot com @ 2012-09-07 10:35 ` rguenth at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: rguenth at gcc dot gnu.org @ 2012-09-07 10:35 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54307 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|WAITING |RESOLVED Resolution| |FIXED --- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-07 10:35:04 UTC --- I believe this change has been reverted for 4.7.2. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-09-07 10:35 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-08-17 21:43 [Bug libstdc++/54307] New: [4.7 regression] increases in memory usage by some C++11 (and C++03) standard containers matt at use dot net 2012-08-17 22:59 ` [Bug libstdc++/54307] " hjl.tools at gmail dot com 2012-08-18 0:05 ` paolo.carlini at oracle dot com 2012-08-21 17:27 ` matt at use dot net 2012-08-21 17:35 ` paolo.carlini at oracle dot com 2012-09-07 10:35 ` rguenth at gcc dot gnu.org
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