Hi Alex, Thank you very much for your help. I opened a bug on bugs.squid-cache.org (https://bugs.squid-cache.org/show_bug.cgi?id=5071). Best regards, Ivan On Mon, Aug 3, 2020 at 10:02 PM Alex Rousskov <rousskov@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > > On 8/3/20 9:11 AM, Ivan Bulatovic wrote: > > > Looks like squid has some serious memory issues when under heavy load > > (90 servers that crawl Internet sites). > > > Maximum Resident Size: 41500720 KB > > If the above (unreliable) report matches your observations using system > tools like "top", then it is indeed likely that your Squid is suffering > from a memory leak -- 41GB is usually too much for most non-caching > Squid instances. > > Identifying the leak may take some time, and I am not volunteering to do > the necessary legwork personally, but the Squid Project does fix > virtually all runtime leaks that we know about. If you want to speed up > the process, one of the best things you can do is to run Squid under > valgrind with a good suppression file. This requires building Squid with > a special ./configure option. Several testing iterations may be > necessary. If you are willing to do this, please file a bug report and > somebody will guide you through the steps. > > > > It just eats up memory, and > > does not free it up even days after it is being used (with no load on > > the proxy for days). > > Some memory retention is expected by default. See > http://www.squid-cache.org/Doc/config/memory_pools/ > > Unfortunately, AFAICT, your mgr:mem output does not show any obvious > leaks -- all numbers are very small. If something is leaking a lot, then > it is probably not pooled by Squid. > > > HTH, > > Alex. > > > > On Mon, Jul 20, 2020 at 10:46 PM Ivan Bulatovic wrote: > >> > >> Hi all, > >> > >> I am trying to configure squid to run as a forward proxy with no > >> caching (cache deny all) with an option to choose the outgoing IP > >> address based on the username. So all squid has to do is to use a > >> certain outgoing IP address for a certain user, return the data from > >> the server to that user and cache nothing. > >> > >> For that I created a special authentication helper and used the ACLs > >> and tcp_outgoing_address to create a lot of users and outgoing IP > >> addresses (about 260 at the moment). Example (not the real IP I use, > >> of course): > >> > >> acl use_IP1 proxy_auth user1 > >> tcp_outgoing_address 1.2.3.4 use_IP1 > >> > >> I also configured the squid to use 4 workers, but this happens even > >> when I use only one worker (default) > >> > >> And this works. However, under heavy load, Squid eats all of the RAM > >> and then starts going to swap. And the memory usage does not drop when > >> I remove all the load from squid (I shut down all clients). > >> > >> I left it to see if the memory will be freed but even after leaving it > >> for an hour the info page reports this: > >> Cache information for squid: > >> Hits as % of all requests: 5min: 0.0%, 60min: 0.0% > >> Hits as % of bytes sent: 5min: 0.0%, 60min: 1.1% > >> Memory hits as % of hit requests: 5min: 0.0%, 60min: 0.0% > >> Disk hits as % of hit requests: 5min: 0.0%, 60min: 100.0% > >> Storage Swap size: 0 KB > >> Storage Swap capacity: 0.0% used, 100.0% free > >> Storage Mem size: 0 KB > >> Storage Mem capacity: 0.0% used, 100.0% free > >> Mean Object Size: 0.00 KB > >> Requests given to unlinkd: 0 > >> > >> Resource usage for squid: > >> UP Time: 255334.875 seconds > >> CPU Time: 7122.436 seconds > >> CPU Usage: 2.79% > >> CPU Usage, 5 minute avg: 0.05% > >> CPU Usage, 60 minute avg: 37.66% > >> Maximum Resident Size: 41500720 KB > >> Page faults with physical i/o: 1003410 > >> > >> And here is the listing of free and top commands (with no load on the server): > >> > >> # free -h > >> total used free shared buff/cache available > >> Mem: 11G 10G 791M 676K 491M 1.0G > >> Swap: 11G 5.5G 6.5G > >> > >> # top > >> top - 14:12:32 up 3 days, 1:30, 1 user, load average: 0.00, 0.00, 0.00 > >> Tasks: 177 total, 1 running, 102 sleeping, 0 stopped, 0 zombie > >> %Cpu0 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu1 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu2 : 0.0 us, 0.3 sy, 0.0 ni, 99.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu4 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu5 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu6 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> %Cpu7 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st > >> KiB Mem : 91.2/12251688 > >> [||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| > >> ] > >> KiB Swap: 45.8/12582904 > >> [|||||||||||||||||||||||||||||||||||||||||||||| > >> ] > >> > >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > >> 7851 proxy 20 0 6946872 2.514g 8084 S 0.0 21.5 29:43.74 squid > >> 7832 proxy 20 0 6711480 2.464g 8040 S 0.0 21.1 29:58.17 squid > >> 7814 proxy 20 0 6834928 2.454g 10024 S 0.0 21.0 29:47.56 squid > >> 7843 proxy 20 0 6906252 2.436g 8208 S 0.0 20.8 29:15.60 squid > >> 1329 root 20 0 2416672 167272 12680 S 0.0 1.4 136:18.57 metricbeat > >> 1321 root 20 0 1831804 48364 11648 S 0.0 0.4 14:32.10 filebeat > >> 474 root 19 -1 127796 17576 17144 S 0.0 0.1 0:27.01 > >> systemd-journal > >> 7811 proxy 20 0 549384 14168 8372 S 0.0 0.1 0:20.87 squid > >> 1166 root 20 0 1749724 10596 4468 S 0.0 0.1 0:31.83 snapd > >> 43940 proxy 20 0 28884 9608 5384 S 0.0 0.1 0:00.14 python3 > >> 43941 proxy 20 0 28884 9552 5328 S 0.0 0.1 0:00.10 python3 > >> 43939 proxy 20 0 28884 9524 5308 S 0.0 0.1 0:00.12 python3 > >> 43938 proxy 20 0 28884 9452 5232 S 0.0 0.1 0:00.16 python3 > >> 48848 root 20 0 105688 6960 5968 S 0.0 0.1 0:00.02 sshd > >> 48974 janitor 20 0 108120 5380 4372 S 0.0 0.0 0:00.00 sshd > >> 1 root 20 0 86360 4364 2488 S 0.0 0.0 32:46.22 systemd > >> ... > >> ... lines ommited > >> ... > >> > >> In the attachment you can find the printout from squidclient mgr:info > >> and squidclient mgr:mem. These are both taken at the moment when there > >> is no more load on the proxy. I also included my squid.conf file > >> (minus the two files where acls are defined and outgoing IP addresses, > >> these two contain only acl and tcp_outgoing_address lines as in the > >> example above). > >> > >> Machine info: > >> OS: Ubuntu 18.04 with latest updates > >> Squid version 4.12 (from diladele repository) > >> Hardware: Hyper-V virtual machine with 8 vCPU, 12GB of RAM > >> > >> I can not understand what is eating all of the memory, if I disabled the cache. > >> > >> Maybe I configured something wrong but I can not find what. > >> > >> Thank you for any help you can provide. > >> > >> Best regards, > >> Ivan > > _______________________________________________ > > squid-users mailing list > > squid-users@xxxxxxxxxxxxxxxxxxxxx > > http://lists.squid-cache.org/listinfo/squid-users > > > _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
