# Why can't I clear the RAM cache on my VPS?
Source: https://vpsdime.com/knowledgebase/troubleshooting/clear-ram-cache
Last reviewed: 2026-07-05
Summary: You don't need to clear Linux's RAM cache, and doing so makes performance worse. Cache is reclaimable by design and Linux frees it automatically under memory pressure. What the cache actually does and why drop_caches is a placebo.

## What this is

You've noticed a lot of memory listed as cache/buffers and want to "free" it. The short answer: **you don't need to, and you shouldn't.** Linux has decades of refined memory management built in; it uses otherwise-idle RAM to cache frequently accessed files, and it releases that cache **automatically and instantly** the moment your applications need the memory. It will never let the system run out of memory just to keep things cached.

## Why clearing it hurts

The cache is pure upside: reads served from RAM instead of disk make your entire VPS faster. Forcing it empty (the `drop_caches` trick) doesn't create memory your apps couldn't already claim, it just throws away the speed boost, and Linux has to rebuild the cache from disk afterwards. It solves no real problem and creates a small one.

If a monitoring tool is scaring you by counting cache as "used", read [My VPS is using too much memory](https://vpsdime.com/knowledgebase/troubleshooting/vps-using-too-much-memory), the **available** column in `free -h` is the number that matters, and our panel [Graphs](https://vpsdime.com/knowledgebase/client-area/services/graphs) already measure it correctly. Tools that read **cgroups counters** (`docker stats`, `systemctl status`, anything reading `memory.current`) are the usual scare source: the cgroup charge **includes the page cache by design**, so their "used" is application memory plus cache lumped together. The long-form explainer: [linuxatemyram.com](https://www.linuxatemyram.com/).

## Seeing stale content on your website? That's a different cache entirely

If what brought you here is a website **showing old content**, an edit that won't appear, a stale page, yesterday's prices, the RAM cache is the wrong suspect: Linux's page cache stores file data transparently and can't serve your visitors outdated pages. What does is one of the **application-level caches**, and the fix is at that layer:

- **The browser**: rule it out first with a hard refresh or a private window.
- **Cloudflare or another CDN**: if the site is proxied, the edge may be serving a cached copy, purge the URL (or flip on Development Mode while you work). See [Cloudflare best practices](https://vpsdime.com/knowledgebase/getting-started/cloudflare-best-practices).
- **Your CMS or app's cache**: WordPress caching plugins and framework page caches keep rendered copies, clear the cache from within the app.
- **PHP OPcache**: caches compiled PHP code, so an edited `.php` file can keep running as the old version. Reloading PHP clears it: `systemctl reload php8.2-fpm` (your version may differ).
- **Redis or Memcached**: object caches the application put data in, and the application should be the one to clear (its own cache-flush command or admin button), avoid a blanket `FLUSHALL` on a Redis instance that might also hold real data, like sessions or queues.

Work from the outside in (browser → CDN → app → OPcache) and the stale layer announces itself. None of these involve `drop_caches`, and clearing the RAM cache won't refresh a single page.

## The one takeaway

If **available** memory is healthy, there is nothing to clear. If it isn't, clearing cache won't help, find the process eating RAM or [upgrade the plan](https://vpsdime.com/knowledgebase/client-area/services/upgrade-downgrade).

## Still need help?

You can [open a support ticket](https://vpsdime.com/open-ticket/). So we can help on the first reply, it's worth mentioning:

- the VPS hostname or IP,
- the output of `free -h`,
- what made you look at memory in the first place (slowness, crashes, a graph).

## Related questions

- "How do I clear cached memory on my VPS?"
- "Should I use drop_caches to free RAM?"
- "Why is so much memory shown as buffers/cache?"
- "Does clearing the cache speed up my server?"
- "My website shows old content, do I need to clear the server's cache?"
- "I edited a PHP file but the site still runs the old version."