Hello!
OSD already has some useful asok commands in the matter of
memory profiling / stats (`get_heap_property`, `heap` -- please
take a look on OSD.cc where these cmds are registered).
Maybe they would suit your use-case better than printing to
a log in `tick()`.
Regards,
Radek
On Sat, Nov 11, 2023 at 4:27 AM Suyash Dongre <suyashd999@xxxxxxxxx> wrote:
>
> Hi guys!This is a function for MDS (src/mds/MDCache.cc) that prints out the rss and other memory stats every couple seconds at debug level 2.I am trying to create a similar function for printing memory and other stats for OSD. (will be adding the code in src/osd/OSD:tick() function),can anyone provide a basic guidelines about what all classes, functions I will need to use and what all will I require for achieving so?Any help would be extremely valuable, Thanks for your time!
>
> void MDCache::check_memory_usage()
> {
> static MemoryModel mm(g_ceph_context);
> static MemoryModel::snap last;
> mm.sample(&last);
> static MemoryModel::snap baseline = last;
>
> // check client caps
> ceph_assert(CInode::count() == inode_map.size() + snap_inode_map.size() + num_shadow_inodes);
> double caps_per_inode = 0.0;
> if (CInode::count())
> caps_per_inode = (double)Capability::count() / (double)CInode::count();
>
> dout(2) << "Memory usage: "
> << " total " << last.get_total()
> << ", rss " << last.get_rss()
> << ", heap " << last.get_heap()
> << ", baseline " << baseline.get_heap()
> << ", " << num_inodes_with_caps << " / " << CInode::count() << " inodes have caps"
> << ", " << Capability::count() << " caps, " << caps_per_inode << " caps per inode"
> << dendl;
>
> mds->update_mlogger();
> mds->mlogger->set(l_mdm_rss, last.get_rss());
> mds->mlogger->set(l_mdm_heap, last.get_heap());
> }
>
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