My computer over the last week has (after using the computer for a few hours) shown very high ram usage, around 50 - 60% out of 32GB, even though nothing in htop appears to be the culprit with the highest consumer being Firefox at 1.6% ram, even in a tty, around half of my ram is being used up even though no process shows over 0.1% ram. Rebooting does seem to work, but I’d prefer not to every few hours. Do you think it might be an issue with hardware? I did build my pc so perhaps something’s broken?
It’s probably buffer/cache.
I hate that this is the default answer to these questions, most tools by which less tech savy have detrmined that something is using a lot of ram are accounting for buffers and don’t subtract it from the free space. Every time when I clicked on someones post (well on Reddit, here its the first one) regarding their ram usage being high and this website was posted, it was not the buffer/cache. So while it is obviosly important to get to know how OP determined that something was using a lot of ram, directly assuming that they read it wrong is imo simply not helpful and in most cases just more confusing
You’re right. In this comment they specified that games crash when the RAM fills, so it most probably isn’t just buffer/cache.
I assumed that it was buffer/cache since they mentioned that it doesn’t show any process using that much RAM. Next time I’ll ask if the high RAM usage has any negative effect, to make sure.
Compared to Windows NT, Linux is famous for using spare pages for cache, and reporting relatively high RAM usage, which is not directly related to the working sets used by processes. It also (I think NT also does this) pre-zeroes unused pages during idle CPU time, so they can be allocated to processes faster on demand.
There’s probably no problem. And as the other commenter mentions, if you dig down into the reporting, you can figure out how much is actually going to processes.
It just that games sometimes crash my computer if 100% ram is being used
Do you not have a swap partition/file?
Does that include the buffer/cache memory usage?
How would I find this out?
Run
free -mand look at the output. That will tell you how much memory is used by programs, how much is being used as cache, and how much is available. The memory used as cache will be freed if a program needs it.total used free shared buff/cache available Mem: 32032 20961 2048 464 9022 10152 Swap: 2048 138 1909Here’s the output
Something’s using a lot of memory. It’s not just buffer/cache memory. That’s definitely not normal.
Did it just recently start using that much memory? I would suspect that something has a memory leak.
Ah ok, thanks.
Are you using zfs?
What filesystems are you using?
Could you create a pie graph using
smem?Are you using ZFS?
If you close firefox, how much RAM is used?
