So we allocated 128 MB and then successfully managed to use 192 MB. Stress: info: successful run completed in 30s Stress: dbug: <- worker 7 signalled normally
Stress: dbug: allocating 201326592 bytes.
Stress: dbug: using backoff sleep of 3000us Stress: info: dispatching hogs: 0 cpu, 0 io, 1 vm, 0 hdd Setupįor the purpose of this post I set up a Virtual Machine with 4 GB of physical memory and 8 GB of virtual memory.ĭocker run -m 128M stress -t 30s -vm 1 -vm-bytes 192M -vm-keep So, yes, virtual memory will allow you to load larger processes into memory, but they will be less responsive because of the latency of swapping data back and forth with the disk. But relative to physical memory, virtual memory is slow. This sounds great: expand the effective amount of memory available up to the size of your disk! Yes, you could. You can increase the amount of virtual memory available by allocating more disk space. It’s a crafty operating system trick to emulate memory by swapping pages of physical memory out to disk. Virtual memory is not really memory at all. The amount of physical memory is constrained by the amount of RAM you have installed on the machine. There are two main types of memory: physical and virtual. This short post details some of the things that I learned. This lead to some frantic learning about memory management with Docker. And the timing was bad: we were using it live with a client. We recently had a situation where one of the Docker solutions we’ve been developing at Fathom Data suddenly started having memory issues. This is great… but what happens when it doesn’t? Memory is something I generally don’t worry about when working with Docker.
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