On Jul 21, 1:41 pm, Trond Norbye <[email protected]> wrote: > Are you running out of virtual memory ;) >
Well, the problem is that memcached will use swap, when it runs out of resident memory. When swap space fills up, memcached will crash under load. Yesterday, I had the -m option set to 3700 (or 3700 megabtyes), since I have a 4GB system. But, I started getting evictions when the dataset reached the size of 3219.9 megabytes. As I mentioned above, I started getting evictions at 3763 megabytes of RSS and 3834 megabytes of VSZ. Is the -m option the size of the dataset or is it the size of resident memory? Today, I increased the -m option to 8000 (or 8000 megabytes) to see what would happen. I only have 3954 megabytes total memory in the system. Now, memcached is filling up the swap space. I assume that I will start getting evictions when the virtual memory is full. It seems to me that I should avoid touching the swap space, since memcached can become unstable when using swap space. But, last week, I got into trouble because I set the -m option close to the total available memory on the system, and I guess that I had the value set too high, since the swap space filled up and memcached crashed. Today, I am trying to duplicate the issue that I saw last week. David
