Please attach output of MallocExtension::GetStats. I need to know what exact metric
2000mb is.

i dont link to this library but LD_PRELOAD it. I am talking about the following output
when heap profiling is on:-
Dumping heap profile to /tmp/abc.0043.heap (2050 MB allocated cumulatively, 167 MB
currently in use). Here 2050 MB allocated cumlatively is way off then what i see in
output of top command which shows VIRT, RES and SHR as 500m, 326m and 50m. Also eventually
probably because of a leak in my program kernel oom kills my process with the following
output:-

%KERN-1-SYSTEM_MSG: [49326.103001] Proc xyz (15511) with Total_VM 594236 KB Resident_Mem
87991 KB Anon_Resident_Mem 87615 KB being killed due to lack of memory  - kernel

when tcmalloc in the very end reported the following:-
Dumping heap profile to /tmp/abc.0055.heap (2623 MB allocated cumulatively, 231 MB
currently in use)

So why this different, where is 2623 mb allocation value coming from ?

Misunderstanding appears to be due to not paying attention to "cumulative" in this message.

It really means cumulative. I.e. it is sizes of all memory allocations ever made added
together.

Great thanks for your help. I am just beginning to use this great tool. Few question,
i am guessing you can help answer:-
-So cumulative means all memory ever allocated by the process(using free/new) including
the memory which is already free. Please confirm ?
-231mb currently in use. This is allocated using malloc/new but not yet freed ? Please
confirm

-i am trying to find memory leaks using the following command,
pprof) Linux(debug)# /tmp/pprof /isan/bin/abc --base abc.0080.heap abc.0090.heap. and
it reports the following:-
(pprof) top
Total: 3.3 MB
     0.6  19.7%  19.7%      0.6  19.7% _ZN7adaptor18EthPortStatsHistMo7factoryEN2mo11FactoryTypeE
     0.5  13.7%  33.3%      0.5  13.7% _ZN7adaptor23EthPortMcastStatsHistMo7factoryEN2mo11FactoryTypeE

A couple of questions about this:-
a: Is this a good way to detect leaks?
b: is the Total reported here the extra malloc's done from the base which were not
freed yet
c: i get the above output which  doesnt display the proper stack. is there a way i
can get the complete stack where the extra malloc happened ?

PS: if you think there is a better forum i should go please let me know.

>> -So cumulative means all memory ever allocated by the process(using free/new) including
the memory which is already free. Please confirm ?

Yes.

>> -231mb currently in use. This is allocated using malloc/new but not yet freed ?
Please confirm

Yes

>> a: Is this a good way to detect leaks?

Yes. As pointed out in the docs.

>> b: is the Total reported here the extra malloc's done from the base which were not
freed yet

Yes.


>> c: i get the above output which  doesnt display the proper stack. is there a way
i can get the complete stack where the extra malloc happened ?

--web may give you that information