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s1aKOc1vgrxIrqGKTbYzB5IYKURg38oFo4AN/mIyhUFEm1ZruZaBccVHqOMmlQ8qjAlccbwlftrQnMzbgGSTEg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: YQBPR01MB11149 X-BeenThere: lttng-dev@lists.lttng.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: LTTng development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Kienan Stewart via lttng-dev Reply-To: Kienan Stewart Errors-To: lttng-dev-bounces@lists.lttng.org Sender: "lttng-dev" Hi Lakshya, what is the output of the following commands on both systems: * nproc (32, I assume) * cat /sys/devices/system/cpu/possible also, when you are running instrumented applications which user(s) are you running applications as? thanks, kienan On 3/11/25 6:35 AM, Gour DEV via lttng-dev wrote: > Hello, > > I have recently upgraded from lttng 2.10 to 2.13 as part of servers > migration from buster to bookworm. > > lttng 2.10.6 - KeKriek to lttng 2.13.9 - Nordicité > > I see an increase in memory consumption upto 11Gig after my recent upgrade. > > > In buster > > root@localhost:~# top -b -n 1 | grep lttng > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 4296 root 20 0 1003676 19616 4608 S 0.0 0.1 0:00.67 lttng-sessiond > 4297 root 20 0 44260 800 0 S 0.0 0.0 0:00.00 lttng-runas > 4643 root 20 0 5838512 10396 9204 S 0.0 0.0 0:09.24 lttng-consumerd > 4646 root 20 0 48048 544 0 S 0.0 0.0 0:00.00 lttng-runas > > > In bookworm > In bookworm. > root@edgecore-40XKE-j2-101-32:~# top -b -n 1 | grep lttng > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 4824 root 20 0 1098824 13336 5980 S 11.8 0.0 0:03.46 lttng-s+ > 4825 root 20 0 48872 2188 1012 S 0.0 0.0 0:00.00 lttng-r+ > 4841 root 20 0 11.5g 11.0g 11.0g S 0.0 35.4 2:33.33 lttng-c+ > 4843 root 20 0 3680 1160 816 S 0.0 0.0 0:00.23 lttng-r+ > > > I have a python script which was used to enable channels, these were the > parameters I was using > large_channels_sz = 4000000 > medium_channels_sz = 200000 > small_channels_sz = 10000 > > num_large = 4 > num_medium = 4 > num_small = 4 > > def enable_channel(channels, session, subbuf_size, subbuf_num): > for c in channels: > call(['lttng', 'enable-channel', '-u', c, '-s', session, '--subbuf-size', > str(subbuf_size), '--num-subbuf', str(subbuf_num),], > stdout=devnull, stderr=subprocess.STDOUT) > > enable_channel(large_channels, def_session, large_channels_sz, num_large) > enable_channel(medium_channels, def_session, medium_channels_sz, num_medium) > enable_channel(small_channels, def_session, small_channels_sz, num_small) > > > > there are total 16 large channels and 6 medium channels and no small > channels. > > > The total size for all these session cominded turn out to be machine > roughly 7GB on my 32 core machine, which is still less that the amount of > memory used by the lttng-consumerd. > > I only have default session configured and nothing else > > root@edgecore-40XKE-j2-101-32:~# lttng list > Available recording sessions: > 1) default [active snapshot] > > > > > I have seen that when only the channel are enable and no process which is > using lttng is running then, I see normal memory consumption. > > > root@edgecore-40XKE-j2-101-32:~# top -b -n 1 | grep lttng > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 4824 root 20 0 1098184 12732 5376 S 0.0 0.0 0:03.15 lttng-s+ > 4825 root 20 0 48872 2188 1012 S 0.0 0.0 0:00.00 lttng-r+ > 4841 root 20 0 536240 4284 2400 S 0.0 0.0 2:09.32 lttng-c+ > 4843 root 20 0 3680 1160 816 S 0.0 0.0 0:00.23 lttng-r+ > > > But, as soon as I run even an single process which is linked to lttng, and > which is *not* using any lttng channel > > liblttng-ust.so.1 => /lib/x86_64-linux-gnu/liblttng-ust.so.1 (0x > 00007fa867ea3000) > liblttng-ust-common.so.1 => /lib/x86_64-linux-gnu/liblttng-ust-common.so.1 ( > 0x00007fa86752d000) > liblttng-ust-tracepoint.so.1 => > /lib/x86_64-linux-gnu/liblttng-ust-tracepoint.so.1 > (0x00007fa86750b000) > > I see an very high memory consumption of 5.5g and when i run all the > process then i see the total memory consumption reaching uptop 11G. > > > Do you have any hints on why this could be happening, > > Thank You. >