# REDIS swap memory problems **URL:** \ **Category:** Self-hosting\ **Tags:** server-resources\ **Created:** [April 30, 2019, 12:01pm UTC](https://meta.discourse.org/t/redis-swap-memory-problems/116429 "2019-04-30T12:01:45Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![pgr](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/pgr/32/156783_2.png) [@pgr](https://meta.discourse.org/u/pgr)\ **Post date:** [April 30, 2019, 12:01pm UTC](https://meta.discourse.org/t/redis-swap-memory-problems/116429/1 "2019-04-30T12:01:45Z")
Hi. I just a ran a big import job on the server (Docker [standard install](https://meta.discourse.org/t/142537?silent=true), updated 2 weeks ago) that I am getting ready for production. The import went well up to the point where it was updating reply counts, then it failed. Now I get high CPU usage in my server, with exhausted 2GB swap: ```plaintext free -m total used free shared buff/cache available Mem: 2000 1620 71 251 308 13 Swap: 2047 2047 0 ``` I’ve read a few related threads on these forums, but they seem to mention old memory leaks that are supposed to be fixed now. I have restarted the container, but it went back to the same state… `top` shows `redis-server` eating up CPU. Some other outputs: ```plaintext pedro@discourse:~$ dmesg | egrep -i "killed process" [267432.830391] Killed process 26850 (redis-server) total-vm:2003500kB, anon-rss:784556kB, file-rss:0kB [267448.176311] Killed process 26872 (redis-server) total-vm:2003500kB, anon-rss:792068kB, file-rss:0kB [267482.515811] Killed process 26884 (redis-server) total-vm:2003500kB, anon-rss:793852kB, file-rss:0kB [267551.301553] Killed process 26910 (redis-server) total-vm:2003500kB, anon-rss:793084kB, file-rss:0kB [267668.666869] Killed process 27151 (redis-server) total-vm:2003500kB, anon-rss:701624kB, file-rss:4kB [267691.245445] Killed process 27289 (redis-server) total-vm:2003500kB, anon-rss:738988kB, file-rss:0kB [267706.403592] Killed process 27311 (redis-server) total-vm:2003500kB, anon-rss:747404kB, file-rss:0kB [267725.563074] Killed process 27326 (redis-server) total-vm:2003500kB, anon-rss:782692kB, file-rss:0kB [267743.125236] Killed process 27345 (redis-server) total-vm:2003500kB, anon-rss:747368kB, file-rss:0kB [267759.046725] Killed process 27362 (redis-server) total-vm:2003500kB, anon-rss:773652kB, file-rss:0kB [267785.725355] Killed process 27377 (redis-server) total-vm:2003500kB, anon-rss:778980kB, file-rss:0kB [267806.894015] Killed process 27401 (redis-server) total-vm:2003500kB, anon-rss:780564kB, file-rss:100kB [267837.641000] Killed process 27416 (redis-server) total-vm:2003500kB, anon-rss:783924kB, file-rss:0kB [267859.241967] Killed process 27441 (redis-server) total-vm:2003500kB, anon-rss:780548kB, file-rss:0kB [267871.387644] Killed process 27460 (redis-server) total-vm:2003500kB, anon-rss:674692kB, file-rss:0kB [267889.559699] Killed process 27471 (redis-server) total-vm:2003500kB, anon-rss:735068kB, file-rss:0kB [267907.637106] Killed process 27489 (redis-server) total-vm:2003500kB, anon-rss:775688kB, file-rss:0kB [267926.757203] Killed process 27505 (redis-server) total-vm:2003500kB, anon-rss:782580kB, file-rss:0kB [267931.645424] Killed process 27520 (redis-server) total-vm:2003496kB, anon-rss:198056kB, file-rss:0kB ``` ```plaintext pedro@discourse:~$ df -h Filesystem Size Used Avail Use% Mounted on udev 991M 0 991M 0% /dev tmpfs 201M 21M 180M 11% /run /dev/vda1 58G 29G 30G 50% / tmpfs 1001M 0 1001M 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 1001M 0 1001M 0% /sys/fs/cgroup /dev/vda15 105M 3.4M 101M 4% /boot/efi tmpfs 201M 0 201M 0% /run/user/1002 ``` I also have a full log of the importer output on a file, it starts throwing these very frequently from a certain point on: ```plaintext 66564 / 78241 ( 85.1%) [413 items/min] Exception while creating post 68204. Skipping. MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error. /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/redis-4.0.1/lib/redis/client.rb:119:in `call' /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/redis-4.0.1/lib/redis.rb:523:in `block in del' /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/redis-4.0.1/lib/redis.rb:45:in `block in synchronize' /usr/local/lib/ruby/2.6.0/monitor.rb:230:in `mon_synchronize' /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/redis-4.0.1/lib/redis.rb:45:in `synchronize' /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/redis-4.0.1/lib/redis.rb:522:in `del' /var/www/discourse/lib/discourse_redis.rb:216:in `block in del' /var/www/discourse/lib/discourse_redis.rb:169:in `ignore_readonly' /var/www/discourse/lib/discourse_redis.rb:214:in `del' /var/www/discourse/lib/distributed_mutex.rb:37:in `synchronize' /var/www/discourse/lib/distributed_mutex.rb:5:in `synchronize' /var/www/discourse/lib/post_creator.rb:333:in `transaction' /var/www/discourse/lib/post_creator.rb:165:in `create' /var/www/discourse/script/import_scripts/base.rb:566:in `create_post' /var/www/discourse/script/import_scripts/base.rb:514:in `block in create_posts' /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.0.1/lib/patches/db/mysql2.rb:8:in `each' /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.0.1/lib/patches/db/mysql2.rb:8:in `each' /var/www/discourse/script/import_scripts/base.rb:501:in `create_posts' script/import_scripts/kunenapgr.rb:150:in `block in import_posts' /var/www/discourse/script/import_scripts/base.rb:884:in `block in batches' /var/www/discourse/script/import_scripts/base.rb:883:in `loop' /var/www/discourse/script/import_scripts/base.rb:883:in `batches' script/import_scripts/kunenapgr.rb:128:in `import_posts' script/import_scripts/kunenapgr.rb:78:in `execute' /var/www/discourse/script/import_scripts/base.rb:47:in `perform' script/import_scripts/kunenapgr.rb:186:in `
' ``` Can anybody please help me troubleshoot? What more information do you need? ---
**Author:** ![pfaffman](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/pfaffman/32/120154_2.png) [@pfaffman](https://meta.discourse.org/u/pfaffman)\ **Post date:** [April 30, 2019, 12:45pm UTC](https://meta.discourse.org/t/redis-swap-memory-problems/116429/2 "2019-04-30T12:45:57Z")
If recommend that you bump to 8gb of ram to finish the import. After that you’ll likely still need more than 2gb. A rule of thumb is that you want enough ram for the database to fit in memory ---
**Author:** ![codinghorror](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/codinghorror/32/110067_2.png) [@codinghorror](https://meta.discourse.org/u/codinghorror)\ **Post date:** [April 30, 2019, 2:08pm UTC](https://meta.discourse.org/t/redis-swap-memory-problems/116429/3 "2019-04-30T14:08:10Z")
This is not really correct, I would say for active migrations that is a good guideline but for a live site at least 1/2 the database in memory should suffice.