[SR-Users] Re: pkg memory leak when acc module cdr_enabled

-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com -----Original Message----- From: Henning Westerholt hw@gilawa.com Sent: Thursday, January 5, 2023 4:17 PM To: Alex Balashov abalashov@evaristesys.com Cc: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org; sr-dev@lists.kamailio.org Subject: [sr-dev] Re: [SR-Users] pkg memory leak when acc module cdr_enabled (adding sr-dev) Hi Alex, the memory allocator of glibc was not really efficient regarding the particular needs of a SIP server (allocation of many small string objects). That has probably improved in the last years, also system performance just got much faster. Other programs/tools also use their own allocators, e.g. Firefox, Rust [1] for jemalloc. There is some (not really well tested) support in the core for using the system memory allocator by the #define SYS_MALLOC. It probably needs to be set in Makefile.defs, also deactivating the other PKG memory managers, but did not looked into it right now. Cheers, Henning [1] https://news.ycombinator.com/item?id=8612645 -- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com -----Original Message----- From: Alex Balashov abalashov@evaristesys.com Sent: Thursday, January 5, 2023 3:59 PM To: Henning Westerholt hw@gilawa.com Cc: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: Re: [SR-Users] pkg memory leak when acc module cdr_enabled > On Jan 5, 2023, at 9:40 AM, Henning Westerholt hw@gilawa.com wrote: > > Hello Alex, > > there might be some performance implications by switching to system malloc. There is also easier debugging by internal Kamailio memory manager support. > > In this particular example with the leak, Kamailio would use in the end all of the system memory, and the machine out of memory killer will then randomly processes. So the limited memory pool also helps to protect the system against this kind of leaks. I am in no position to assess the relative efficiencies of various memory allocators. But it seems a bit extraordinary to suppose that a custom allocator is more efficient than the general-purpose libc allocator, although it's obviously possible; some application-specific optimised allocators clearly make this argument (i.e. Redis + jemalloc). Also, I wonder if the answer to this has changed over 20 years. Unbounded allocation from leaks can certainly be a problem. But rendering a process useless by running out of (much more limited) package memory (much more quickly) can also be a problem. :-) -- Alex -- Alex Balashov Principal Consultant Evariste Systems LLC Web: https://evaristesys.com Tel: +1-706-510-6800 _______________________________________________ Kamailio (SER) - Development Mailing List To unsubscribe send an email to sr-dev-leave@lists.kamailio.org