Stop building for 32 bit

[Julien Pivotto]

Dear developers,

Based on this comment from Brian, should we stop providing official 32 bit builds
of Prometheus?

> 2.19 requires more virtual memory than previous versions, you need a
> 64bit machine. 32bit system are generally not supported as we use mmap
> a lot, if you want to try to get it to work you can but we don't
> promise anything there as trying to support 32bit systems would
> cripple things for the vast majority of our users on 64bit systems. I
> can only suggest looking at Prometheus 1.x, which did not use mmap.

https://github.com/prometheus/prometheus/pull/7686#issuecomment-682534007

If we build them but not recommend them, that seems like a waste of time
and resources.

--
Julien Pivotto
@roidelapluie

[Ben Kochie]

I think that PR link is incorrect.

Yes, I think we should consider dropping 32-bit official builds. Unless we can reduce the amount of mmap'd data.

One thing I noticed when running on a 32-bit machine a while back was that the mmap'd data is mapped multiple times for different OS threads. Setting GOMAXPROCS=1 helped, but only a little.

There was some discussion about doing mmap on demand, but there was not enough interest in 32-bit to consider spending the time.

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[Brian Brazil]

On Sat, 29 Aug 2020 at 10:07, Ben Kochie <sup...@gmail.com> wrote:

I think that PR link is incorrect.

Yes, I think we should consider dropping 32-bit official builds. Unless we can reduce the amount of mmap'd data.

The amount of mmapping we do is only going to increase.

 

One thing I noticed when running on a 32-bit machine a while back was that the mmap'd data is mapped multiple times for different OS threads. Setting GOMAXPROCS=1 helped, but only a little.

That doesn't sound right, we do map some files more than once (particularly during compaction) but not per thread.

 

There was some discussion about doing mmap on demand, but there was not enough interest in 32-bit to consider spending the time.

Even if all that complexity was added and the lack of predictable performance was acceptable, you'd still be limited to rather small data sizes. I don't think there's much point complicating the codebase for the sake of a Prometheus that can't handle more than a few hundred MB of data.

Brian

 

On Fri, Aug 28, 2020 at 3:05 PM Julien Pivotto <roidel...@prometheus.io> wrote:

Dear developers,

Based on this comment from Brian, should we stop providing official 32 bit builds
of Prometheus?

> 2.19 requires more virtual memory than previous versions, you need a
> 64bit machine. 32bit system are generally not supported as we use mmap
> a lot, if you want to try to get it to work you can but we don't
> promise anything there as trying to support 32bit systems would
> cripple things for the vast majority of our users on 64bit systems. I
> can only suggest looking at Prometheus 1.x, which did not use mmap.

https://github.com/prometheus/prometheus/pull/7686#issuecomment-682534007

If we build them but not recommend them, that seems like a waste of time
and resources.

--
Julien Pivotto
@roidelapluie

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--

Brian Brazil

www.robustperception.io

[Julien Pivotto]

https://github.com/prometheus/prometheus/issues/7483#issuecomment-651647450

The correct link.

To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-developers/CAHJKeLqHT724Uj9%3D7KiWZg%3DWuRwEaaOFZEZxb6TPF-gD9JkuMw%40mail.gmail.com.