What is using all my RAM? Understanding the output of top
8,402
The short answer is that the rest of your memory is used to cache your applications.
The long answer can be found here.
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Author by
TommesDee
I work at Crossref. Interested in Java, Clojure, Rust these days.
Updated on September 18, 2022Comments
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TommesDee almost 2 years
I've read a number of
top
memory use questions but I don't think they answer this.Here's the most significant part of a
top
run:top - 01:11:41 up 4 days, 1:06, 3 users, load average: 0.00, 0.03, 0.26 Tasks: 86 total, 1 running, 84 sleeping, 0 stopped, 1 zombie Cpu(s): 0.4%us, 0.4%sy, 0.0%ni, 99.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1022816k total, 986704k used, 36112k free, 11200k buffers Swap: 1048572k total, 419088k used, 629484k free, 408172k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2022 django 20 0 463m 87m 688 S 0.4 8.7 0:44.06 redis-server 6047 django 20 0 106m 25m 3900 S 0.4 2.6 0:16.57 python 6046 django 20 0 40892 13m 2852 S 0.0 1.4 0:00.14 python 6887 postgres 20 0 98752 5240 4100 S 0.0 0.5 0:00.60 postgres 6512 root 20 0 70820 2528 1776 S 0.0 0.2 0:00.03 sshd 3614 root 20 0 70820 2452 1696 S 0.0 0.2 0:00.03 sshd 6892 postgres 20 0 99028 2044 720 S 0.0 0.2 0:00.53 postgres 12983 django 20 0 18332 1968 1156 S 0.0 0.2 0:00.06 bash 3627 joe 20 0 71148 1660 632 S 0.0 0.2 0:00.84 sshd 6890 postgres 20 0 98752 1640 500 S 0.0 0.2 0:02.59 postgres 3628 joe 20 0 18056 1588 1056 S 0.0 0.2 0:00.10 bash 6537 postgres 20 0 18000 1580 1100 S 0.0 0.2 0:00.04 bash 6893 postgres 20 0 70296 1564 296 S 0.0 0.2 0:00.38 postgres 708 mysql 20 0 166m 1560 408 S 0.0 0.2 3:08.15 mysqld 9221 root 20 0 31724 1456 1148 S 0.0 0.1 0:00.01 sudo
This states that 986704k out of 1022816k is used (I make that about 96%). However the top 3 processes' percentages add up to 12.7%. Something is using nearly all of my RAM and I can't tell what it is.
free
shows me similar numbers.Any suggestions about trying to find out what's using this all?
(I notice there's 1 zombie process. Could it be that?)
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TommesDee over 12 yearsThat could be it. I have written 200,000 files to disk recently.