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Re: [Qemu-devel] Qemu and heavily increased RSS usage
From: |
Peter Lieven |
Subject: |
Re: [Qemu-devel] Qemu and heavily increased RSS usage |
Date: |
Wed, 22 Jun 2016 21:55:51 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
Am 22.06.2016 um 12:56 schrieb Stefan Hajnoczi:
> On Tue, Jun 21, 2016 at 05:12:57PM +0200, Peter Lieven wrote:
>> - We changed the coroutine pool to a per thread model. I disabled the pool.
>> This seems
>> to cut the max used RSS to about 150MB which is still a lot more than
>> qemu-2.2.0
> The per-thread coroutine pools only grow when a thread creates/destroys
> coroutines.
>
> The QEMU main loop, iothread, and maybe vcpus should use coroutines.
> The numerous thread-pool worker threads should not use coroutines IIRC.
>
> Creating coroutines is expensive and the pools improve performance a
> lot. Maybe you can make observations about how to manage pool size more
> efficiently for your VM?
I did not want to blame the coroutine pool. Its a good thing. I just wanted to
mention that we changed from a global pool (with a global mutex) to a thread
based pool. This might influence memory consumption. But the increased RSS
usage I observe is also there with disable coroutine pool.
What makes the coroutine pool memory intensive is the stack size of 1MB per
coroutine. Is it really necessary to have such a big stack?
Peter
- [Qemu-devel] Qemu and heavily increased RSS usage, Peter Lieven, 2016/06/21
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Dr. David Alan Gilbert, 2016/06/21
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Lieven, 2016/06/21
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Stefan Hajnoczi, 2016/06/22
- Re: [Qemu-devel] Qemu and heavily increased RSS usage,
Peter Lieven <=
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Maydell, 2016/06/22
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Stefan Hajnoczi, 2016/06/24
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Lieven, 2016/06/24
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Dr. David Alan Gilbert, 2016/06/24
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Maydell, 2016/06/24
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Lieven, 2016/06/24
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Stefan Hajnoczi, 2016/06/27
- Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Lieven, 2016/06/27
Re: [Qemu-devel] Qemu and heavily increased RSS usage, Peter Lieven, 2016/06/23