https://bugs.kde.org/show_bug.cgi?id=477018
--- Comment #2 from m...@glandium.org ---
Attaching heaptrack to heaptrack_interpret, it's telling me that the huge
memory use comes from:
`std::__new_allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> >::allocate(unsigned long, void const*)` in very few allocations,
apparently.
Following that, I attached gdb to heaptrack_interpret and added a breakpoint to
malloc with a size larger than 1GB, and was stopped at an allocation for 1.6GB,
from which I continued, reaching another allocation for 3.2GB.
The full stack trace:
```
#0 __GI___libc_malloc (bytes=3221225472) at ./malloc/malloc.c:3288
#1 0x00007f2d558a958c in operator new (sz=sz@entry=3221225472)
at ../../../../src/libstdc++-v3/libsupc++/new_op.cc:50
#2 0x000055c194388e4b in
std::__new_allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> >::allocate (this=<optimized out>, __n=134217728)
at /usr/include/c++/12/bits/new_allocator.h:112
#3
std::allocator_traits<std::allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> > >::allocate (__n=134217728, __a=...) at
/usr/include/c++/12/bits/alloc_traits.h:464
#4
std::_Vector_base<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true>,
std::allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> > >::_M_allocate (
__n=134217728, this=<optimized out>) at
/usr/include/c++/12/bits/stl_vector.h:378
#5
std::_Vector_base<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true>,
std::allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> > >::_M_create_storage (
__n=134217728, this=<optimized out>) at
/usr/include/c++/12/bits/stl_vector.h:395
#6
std::_Vector_base<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true>,
std::allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> > >::_Vector_base (
__a=..., __n=134217728, this=<optimized out>) at
/usr/include/c++/12/bits/stl_vector.h:332
#7 std::vector<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true>,
std::allocator<tsl::detail_robin_hash::bucket_entry<IndexedAllocationInfo,
true> > >::vector (__a=...,
__n=134217728, this=0x7ffdf21cd478) at
/usr/include/c++/12/bits/stl_vector.h:552
#8 tsl::detail_robin_hash::robin_hash<IndexedAllocationInfo,
tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::KeySelect, void,
std::hash<IndexedAllocationInfo>, std::equal_to<IndexedAllocationInfo>,
std::allocator<IndexedAllocationInfo>, false,
tsl::rh::power_of_two_growth_policy<2ul> >::robin_hash (this=0x7ffdf21cd470,
bucket_count=134217728, hash=..., equal=..., alloc=..., min_load_factor=0,
max_load_factor=0.5) at
/tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_hash.h:550
#9 0x000055c194389eb0 in
tsl::detail_robin_hash::robin_hash<IndexedAllocationInfo,
tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::KeySelect, void,
std::hash<IndexedAllocationInfo>, std::equal_to<IndexedAllocationInfo>,
std::allocator<IndexedAllocationInfo>, false,
tsl::rh::power_of_two_growth_policy<2ul> >::rehash_impl (
this=0x7ffdf21cd730, count_=<optimized out>)
at /tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_hash.h:1318
#10 0x000055c19438a1ac in
tsl::detail_robin_hash::robin_hash<IndexedAllocationInfo,
tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::KeySelect, void,
std::hash<IndexedAllocationInfo>, std::equal_to<IndexedAllocationInfo>,
std::allocator<IndexedAllocationInfo>, false,
tsl::rh::power_of_two_growth_policy<2ul> >::rehash_on_extreme_load (
curr_dist_from_ideal_bucket=<optimized out>, this=0x7ffdf21cd730)
at /tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_hash.h:1387
#11 tsl::detail_robin_hash::robin_hash<IndexedAllocationInfo,
tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::KeySelect, void,
std::hash<IndexedAllocationInfo>, std::equal_to<IndexedAllocationInfo>,
std::allocator<IndexedAllocationInfo>, false,
tsl::rh::power_of_two_growth_policy<2ul> >::insert_impl<IndexedAllocationInfo,
IndexedAllocationInfo const&> (this=0x7ffdf21cd730, this@entry=0x1000, key=...)
at /tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_hash.h:1234
#12 0x000055c19438a543 in
tsl::detail_robin_hash::robin_hash<IndexedAllocationInfo,
tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::KeySelect, void,
std::hash<IndexedAllocationInfo>, std::equal_to<IndexedAllocationInfo>,
std::allocator<IndexedAllocationInfo>, false,
tsl::rh::power_of_two_growth_policy<2ul> >::insert<IndexedAllocationInfo
const&> (value=..., this=0x1000)
at /tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_hash.h:740
#13 tsl::detail_robin_hash::robin_hash<IndexedAllocationInfo,
tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::KeySelect, void,
std::hash<IndexedA--Type <RET> for more, q to quit, c to continue without
paging--c
llocationInfo>, std::equal_to<IndexedAllocationInfo>,
std::allocator<IndexedAllocationInfo>, false,
tsl::rh::power_of_two_growth_policy<2ul> >::insert_hint<IndexedAllocationInfo
const&> (
value=..., hint=..., this=0x1000)
at /tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_hash.h:750
#14 tsl::robin_set<IndexedAllocationInfo, std::hash<IndexedAllocationInfo>,
std::equal_to<IndexedAllocationInfo>, std::allocator<IndexedAllocationInfo>,
false, tsl::rh::power_of_two_growth_policy<2ul> >::insert (value=..., hint=...,
this=0x1000)
at /tmp/heaptrack-v1.5.0/3rdparty/robin-map/include/tsl/robin_set.h:219
#15 AllocationInfoSet::add (this=this@entry=0x7ffdf21cd730,
size=size@entry=748, traceIndex=...,
traceIndex@entry=..., allocationIndex=allocationIndex@entry=0x7ffdf21cd630)
at /tmp/heaptrack-v1.5.0/src/util/pointermap.h:74
#16 0x000055c1943805dd in main ()
at /tmp/heaptrack-v1.5.0/src/interpret/heaptrack_interpret.cpp:584
```
The most notable in there is that the robin hash has this:
- m_nb_elements = 470664 (not that many)
- m_bucket_count = 67108864 (this seems excessive: 2 orders of magnitude more
than the number of elements!)
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