[Bug]: why so high mem usage

fxmbsw7 commented 2 months ago

Problem description

i start termux , and type ps auxww , then the termux emulator entry looks like this

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND u0_a425 17038 2.3 1.1 18833088 186260 ? R<l 1970 0:17 com.termux

thats 1.1 % of 14.9gb ram .. and the number looks rather way too high .. ?

plz tell me is this normal

thanks

Steps to reproduce the behavior.

open termux and enter ps auxww < enter >

What is the expected behavior?

less ram usage

System information

Termux application version: recent artifacts build
Android OS version: andro 14
Device model: redmagic 8pro

TomJo2000 commented 2 months ago

Let's firstly format that ps output more nicely.

USER    PID   %CPU %MEM VSZ      RSS    TTY STAT START TIME COMMAND
u0_a425 17038 2.3  1.1  18833088 186260 ?   R<l  1970  0:17 com.termux

Alright let's have a look here.

VSZ 18833088 As described in man 1 ps: virtual memory size of the process in KiB (1024-byte units). If we do the math that works out to ~17.96GiB[^1] of virtual memory that has been allocated by Android to be available to Termux if required.
RSS 186260 As described in man 1 ps: resident set size, the non-swapped physical memory that a task has used (in kilobytes). This is the actual memory currently being used by Termux and all of its subprocesses. If we do the math again[^2], that works out to ~181.9MiB being used to run Termux and all of the subprocesses you have running in it. This seems perfectly reasonable, though seems to be marginally higher than the ~150MiB on a fresh session I'm seeing on my device on average, though this may vary based on the services you are running and your configuration.

This is not a bug, this is Termux working as expected.

[^1]: 18833088KiB / 1024^2B = 17.9606323242GiB [^2]: 186260KiB / 1024B = 181.89453125MiB

fxmbsw7 commented 2 months ago

what does this mean

On Thu, Sep 12, 2024, 9:45 AM TomIO @.***> wrote:

Closed #4148 https://github.com/termux/termux-app/issues/4148 as not planned.

— Reply to this email directly, view it on GitHub https://github.com/termux/termux-app/issues/4148#event-14228155538, or unsubscribe https://github.com/notifications/unsubscribe-auth/AJMLP3LQNTN7L63C6JXHKMTZWFBBZAVCNFSM6AAAAABOCOARNCVHI2DSMVQWIX3LMV45UABCJFZXG5LFIV3GK3TUJZXXI2LGNFRWC5DJN5XDWMJUGIZDQMJVGU2TGOA . You are receiving this because you authored the thread.Message ID: @.***>

sylirre commented 2 months ago

Virtual memory, resident memory, memory overcommit and other Linux memory subsystem quirks are not a small topic which can be explained in a comment under GitHub issue ticket. Google it if you are really interested in this.

You already got an answer for original question: yes, the numbers you see are normal.

termux / termux-app