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2026-05-09T08:14:02Z
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Kenneth: /* Swappiness */
2015-02-12T14:43:16Z
<p><span dir="auto"><span class="autocomment">Swappiness</span></span></p>
<p><b>New page</b></p><div>== Swappiness ==<br />
<br />
Set Swappiness Level: [http://en.wikipedia.org/wiki/Swappiness]<br />
sudo sysctl -w vm.swappiness=0 # The kernel will swap only to avoid an out of memory condition<br />
sudo sysctl -w vm.swappiness=60 # The default value.<br />
sudo sysctl -w vm.swappiness=100 # The kernel will swap aggressively.<br />
<br />
<br />
See: https://www.digitalocean.com/community/tutorials/how-to-configure-virtual-memory-swap-file-on-a-vps<br />
<br />
== Mem Eater ==<br />
<br />
<pre><br />
#include <stdlib.h><br />
int main() {<br />
for (;;) {char* mem=malloc(4096); mem[0]=1;};<br />
}<br />
</pre><br />
<br />
gcc memeater.c -o memeater<br />
./memeater<br />
<br />
much slower:<br />
<pre><br />
#include <stdlib.h><br />
int main() {<br />
int i;<br />
for (;;) {char* mem=malloc(256); mem[0]=1;for(i=1;i<=100000;i++){;;}};<br />
}<br />
</pre><br />
<br />
Source: http://unix.stackexchange.com/questions/135114/out-of-swap-what-happens</div>
Kenneth