1. (New) Root Memory checker
Marian Ivanov
(New) Root Memory checker

2. Outlook Motivation New memory checker AliRoot observations
Implementation
User interface
Examples
AliRoot observations

3. Motivation The AliRoot use to much memory Memory checker needed
Valgrind and vtune – too slow – difficult to run realistic simulation reconstruction ( factor 50 slow down)
We need some automatic procedure to check the quality of code – Optimally done during the nightly builds + Sending message to the top violators
Number of new – deletes
Total and current allocated space – development in time
Selective queries – per libraries – per functions

4. Implementation – Classes - Information
TinfoStamp
memory alocation information – TotalCount, CurrentCount, TotalSize, CurrentSize
Code ID, StampNumber
TcodeInfo
Code information – address of the code
TinfoStamps – current, last, max memory stamp, max alloc count
Integrated from all called function
TstackInfo
Array of code information – stack

5. Containers MemStatManager Information dumped to the output tree
std vector of CodeInfos
std vector of StackInfos
std vector of StampInfos – (evolving in time)
Information dumped to the output tree
1. On demand
2. Automatic dump after reaching the predefined size

6. Principles Hook for alloc and free Possibility to enable and disable
Alloc hook:
Get the stack trace
Register the new stack trace if not registered yet
Register memory for given stack (increase counters)
Free hook
Unregister memory for stack created given pointer (decrease counters)

7. User interface – acquiring data
Start
TMemStatDraw draw(100000,1000);
User specify the auto stamp size - Allocated size, Number of allocation
Make stamps – (inside the code - macro)
draw.AddStamp("Start");
funF();
draw.AddStamp("funF");
Destructor
Close the file with stamps

8. User interface – quering of information
Initialization from file - TMemStatDraw draw("memstat.root")
Select code information
draw.SelectCode("testMemstat","fun",TMemStatDraw::kOR)
draw.SortCode(TMemStatDraw::kAllocSize,TMemStatDraw::kCurrent);
draw.PrintCode(10,10)
Select stack information
draw.SelectStack(TMemStatDraw::kOR)
draw.SortStack(TMemStatDraw::kAllocSize,TMemStatDraw::kCurrent);
draw.PrintStack(10,10)

9. User interface – quering of information - output
58 /home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so(_Z9funObjectv+0x60) [0x6037dc]
(nil) /home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so funObject()
62 /home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so(_Z9funObjectv+0x7b) [0x6037f7]
(nil) /home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so funObject()
35 /home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so(_Z4funDv+0x91) [0x6034df]
(nil) /home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so funD()

10. User interface – quering of information - output
code trace
/home/miranov/root6/HEAD/lib/libCore.so TStorage::ObjectAlloc(unsigned int)
/home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so funObject()
/home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so testMemstat2()
/home/miranov/root6/HEAD/memstat/src/testMemstat2_C.so [0x603a7e]
/home/miranov/root6/HEAD/lib/libCint.so Cint::G__ExceptionWrapper(int (*)(G__value*, char const*, G__param*, int), G__value*, char*, G__param*, int)
/home/miranov/root6/HEAD/lib/libCint.so G__call_cppfunc
/home/miranov/root6/HEAD/lib/libCint.so G__interpret_func
/home/miranov/root6/HEAD/lib/libCint.so G__getfunction
/home/miranov/root6/HEAD/lib/libCint.so G__getitem
/home/miranov/root6/HEAD/lib/libCint.so G__getexpr
Summary for selected:

11. Time development

12. AliRoot observation All Summary for selected:
CDB
libGeom
ITS
MUON
TRD
TPC
TOF

13. AliRoot observation
draw.SortStack(TMemStatDraw::kTotalAllocCount,TMemStatDraw::kCurrent);
draw.PrintStack(10,10)
!!!!!!!!!!!!!!!!!!!!!!!!!!
code trace
/home/miranov/root6/HEAD/lib/libCore.so TArrayF::Set(int, float const*)
/home/miranov/root6/HEAD/lib/libCore.so TArrayF::TArrayF(TArrayF const&)
/home/miranov/AliRoot7/HEAD/lib/tgt_linux/libITSbase.so AliITSCalibrationSSD::GetNoiseN() const
/home/miranov/AliRoot7/HEAD/lib/tgt_linux/libITSsim.so AliITSsimulationSSD::ApplyNoise(AliITSpList*
CODE ????????????????????????????????
TArrayF GetNoiseN() const {return fNoisN; }
TArrayF GetNoiseP() const {return fNoisN; }
TArrayF GetGainP() const {return fGainP; }
TArrayF GetGainN() const {return fGainN

14. Future plans Commit memstat package to ROOT
Still some aspects of user interface to be discussed
Work on graphic interface – inside of ROOT
Make set of automatic procedure
Triggered during nightly builds
Possible already now